First let's talk about the types of microphones:
Microphones are generally classified into moving coil type, crystal type, carbon type, aluminum belt type and capacitive type. The most commonly used ones are moving coil microphones and condenser microphones. The former is durable and cheap. Delicate, high price, but excellent in characteristics.
The moving coil microphone is a change of air pressure caused by the acoustic wave induced by the diaphragm, and the coil cutting magnetic field line placed in the magnetic field generates a weak current signal corresponding to the change of the sound pressure intensity. Usually, the dynamic microphone has low noise, no need to feed power, easy to use, and stable and reliable performance.
At the heart of the condenser microphone is a capacitive sensor. The two poles of the capacitor are separated by a narrow air gap, which forms the dielectric of the capacitor. When a voltage is applied between the two poles of the capacitor, the acoustic vibration causes a change in capacitance, and the current in the circuit also changes. By amplifying and outputting the signal, an audio signal of a relatively good quality can be obtained. In addition, there is a resident-stage condenser microphone , which uses a resident body material to make a microphone diaphragm electrode, which can work without external polarization voltage, and simplifies the structure. Therefore, the microphone is very compact and inexpensive, and also has the characteristics of a condenser microphone . It is widely used in various audio equipment and sound collection environments. The condenser microphone has high sensitivity, good frequency response and good sound quality.
To choose the right microphone for you, it is important to understand the meaning of the main technical indicators of the various microphones . The following main technical indicators should be noted when purchasing a microphone :
1. Sensitivity:
At a frequency of 1KHz, pressure of 0.1 Pa predetermined sound input from the microphone front spindle 0 °, the output of the microphone open output voltage in 10mV / Pa. Sensitivity is related to the output impedance. Sometimes expressed in decibels, and 10V is specified as 10V/Pa. Since the microphone output is usually in the order of millivolts, the decibel value of the sensitivity is always negative.
2. Frequency response characteristics:
The sensitivity of the microphone on the 0° spindle varies with frequency. A suitable frequency response range is required, and the characteristic curve within the range should be as smooth as possible to improve sound quality and suppress acoustic feedback. The same sound pressure, and the sound with different frequencies is different when applied to the microphone . The frequency response characteristic is usually expressed by the number of decibels in which the sensitivity in the passband range differs. The wider the passband range, the less the decibel number of the difference, indicating that the frequency response characteristic of the microphone is better, that is, the frequency distortion of the microphone is small.
3. Directivity:
The sensitivity of the microphone to the sound in different directions will be different. This is called the directionality of the microphone . Directionality is related to frequency, and the higher the frequency, the stronger the directivity. In order to ensure the sound quality, the microphone should be required to have a relatively uniform directionality within the frequency response range. The directionality is represented by the difference in sensitivity between the front 0° direction and the back 180° direction of the microphone , and the difference is greater than 15 dB, which is called a strong directional microphone . The product specification often gives the direction of the polar coordinate response curve of the main frequency. The general types are: single-directional "heart shape"; bidirectional "eight-shaped"; and non-directional "circular"; Directivity "super heart type". The directionality of the microphone sensitivity is an important factor in selecting a microphone . Some microphones are unidirectional, others are omnidirectional, and some are somewhere in between, and their directionality is heart-shaped.
The omnidirectional microphone has the same performance for picking up sound from all directions. It is more appropriate to use such a microphone when the speaker wants to move back and forth, but it is not suitable for use in environments with high environmental noise.
The sensitivity of the heart-shaped microphone to the heart is heart-shaped in the horizontal direction, and the front side sensitivity is slightly smaller on the side and the back side is the smallest. This type of microphone has excellent performance in a variety of sound reinforcement systems.
Uni-directional microphone, also known as super-cardioid microphone, it's sharper than the directional cardioid microphone, high sensitivity positive, rapid decay in other directions sensitivity, especially for high-noise environments.
4, the output impedance:
From both ends of the wire into the microphone of the microphone itself is called impedance output impedance. Currently common microphones have high impedance and low impedance. The high-impedance value is about 1000~20000 ohms, which can be directly connected to the amplifier; the low-impedance type is 50-1000 ohms, which can be connected to the amplifier after being matched by the transformer. The output voltage of the high group is slightly higher, but the bypass function of the lead capacitor is larger, which causes the high frequency to drop, and is also susceptible to external electromagnetic field interference. Therefore, the microphone lead should not be too long, generally 10 to 20 meters. should. The low-impedance output does not have this defect, so the noise level is low, the microphone leads can be lengthened accordingly, and some low-impedance microphone leads with a loudspeaker can reach 100 meters. If the distance is longer, a preamp should be added. First let's talk about the types of microphones:
Microphones are generally classified into moving coil type, crystal type, carbon type, aluminum belt type and capacitive type. The most commonly used ones are moving coil microphones and condenser microphones. The former is durable and cheap. Delicate, high price, but excellent in characteristics.
The moving coil microphone is a change of air pressure caused by the acoustic wave induced by the diaphragm, and the coil cutting magnetic field line placed in the magnetic field generates a weak current signal corresponding to the change of the sound pressure intensity. Usually, the dynamic microphone has low noise, no need to feed power, easy to use, and stable and reliable performance.
At the heart of the condenser microphone is a capacitive sensor. The two poles of the capacitor are separated by a narrow air gap, which forms the dielectric of the capacitor. When a voltage is applied between the two poles of the capacitor, the acoustic vibration causes a change in capacitance, and the current in the circuit also changes. By amplifying and outputting the signal, an audio signal of a relatively good quality can be obtained. In addition, there is a resident-stage condenser microphone , which uses a resident body material to make a microphone diaphragm electrode, which can work without external polarization voltage, and simplifies the structure. Therefore, the microphone is very compact and inexpensive, and also has the characteristics of a condenser microphone . It is widely used in various audio equipment and sound collection environments. The condenser microphone has high sensitivity, good frequency response and good sound quality.
To choose the right microphone for you, it is important to understand the meaning of the main technical indicators of the various microphones . The following main technical indicators should be noted when purchasing a microphone :
1. Sensitivity:
At a frequency of 1KHz, pressure of 0.1 Pa predetermined sound input from the microphone front spindle 0 °, the output of the microphone open output voltage in 10mV / Pa. Sensitivity is related to the output impedance. Sometimes expressed in decibels, and 10V is specified as 10V/Pa. Since the microphone output is usually in the order of millivolts, the decibel value of the sensitivity is always negative.
2. Frequency response characteristics:
The sensitivity of the microphone on the 0° spindle varies with frequency. A suitable frequency response range is required, and the characteristic curve within the range should be as smooth as possible to improve sound quality and suppress acoustic feedback. The same sound pressure, and the sound with different frequencies is different when applied to the microphone . The frequency response characteristic is usually expressed by the number of decibels in which the sensitivity in the passband range differs. The wider the passband range, the less the decibel number of the difference, indicating that the frequency response characteristic of the microphone is better, that is, the frequency distortion of the microphone is small.
3. Directivity:
The sensitivity of the microphone to the sound in different directions will be different. This is called the directionality of the microphone . Directionality is related to frequency, and the higher the frequency, the stronger the directivity. In order to ensure the sound quality, the microphone should be required to have a relatively uniform directionality within the frequency response range. The directionality is represented by the difference in sensitivity between the front 0° direction and the back 180° direction of the microphone , and the difference is greater than 15 dB, which is called a strong directional microphone . The product specification often gives the direction of the polar coordinate response curve of the main frequency. The general types are: single-directional "heart shape"; bidirectional "eight-shaped"; and non-directional "circular"; Directivity "super heart type". The directionality of the microphone sensitivity is an important factor in selecting a microphone . Some microphones are unidirectional, others are omnidirectional, and some are somewhere in between, and their directionality is heart-shaped.
The omnidirectional microphone has the same performance for picking up sound from all directions. It is more appropriate to use such a microphone when the speaker wants to move back and forth, but it is not suitable for use in environments with high environmental noise.
The sensitivity of the heart-shaped microphone to the heart is heart-shaped in the horizontal direction, and the front side sensitivity is slightly smaller on the side and the back side is the smallest. This type of microphone has excellent performance in a variety of sound reinforcement systems.
Uni-directional microphone, also known as super-cardioid microphone, it's sharper than the directional cardioid microphone, high sensitivity positive, rapid decay in other directions sensitivity, especially for high-noise environments.
4, the output impedance:
From both ends of the wire into the microphone of the microphone itself is called impedance output impedance. Currently common microphones have high impedance and low impedance. The high-impedance value is about 1000~20000 ohms, which can be directly connected to the amplifier; the low-impedance type is 50-1000 ohms, which can be connected to the amplifier after being matched by the transformer. The output voltage of the high group is slightly higher, but the bypass function of the lead capacitor is larger, which causes the high frequency to drop, and is also susceptible to external electromagnetic field interference. Therefore, the microphone lead should not be too long, generally 10 to 20 meters. should. The low-impedance output does not have this defect, so the noise level is low, the microphone leads can be lengthened accordingly, and some low-impedance microphone leads with a loudspeaker can reach 100 meters. If the distance is longer, a preamp should be added. First let's talk about the types of microphones:
Microphones are generally classified into moving coil type, crystal type, carbon type, aluminum belt type and capacitive type. The most commonly used ones are moving coil microphones and condenser microphones. The former is durable and cheap. Delicate, high price, but excellent in characteristics.
The moving coil microphone is a change of air pressure caused by the acoustic wave induced by the diaphragm, and the coil cutting magnetic field line placed in the magnetic field generates a weak current signal corresponding to the change of the sound pressure intensity. Usually, the dynamic microphone has low noise, no need to feed power, easy to use, and stable and reliable performance.
At the heart of the condenser microphone is a capacitive sensor. The two poles of the capacitor are separated by a narrow air gap, which forms the dielectric of the capacitor. When a voltage is applied between the two poles of the capacitor, the acoustic vibration causes a change in capacitance, and the current in the circuit also changes. By amplifying and outputting the signal, an audio signal of a relatively good quality can be obtained. In addition, there is a resident-stage condenser microphone , which uses a resident body material to make a microphone diaphragm electrode, which can work without external polarization voltage, and simplifies the structure. Therefore, the microphone is very compact and inexpensive, and also has the characteristics of a condenser microphone . It is widely used in various audio equipment and sound collection environments. The condenser microphone has high sensitivity, good frequency response and good sound quality.
To choose the right microphone for you, it is important to understand the meaning of the main technical indicators of the various microphones . The following main technical indicators should be noted when purchasing a microphone :
1. Sensitivity:
At a frequency of 1KHz, pressure of 0.1 Pa predetermined sound input from the microphone front spindle 0 °, the output of the microphone open output voltage in 10mV / Pa. Sensitivity is related to the output impedance. Sometimes expressed in decibels, and 10V is specified as 10V/Pa. Since the microphone output is usually in the order of millivolts, the decibel value of the sensitivity is always negative.
2. Frequency response characteristics:
The sensitivity of the microphone on the 0° spindle varies with frequency. A suitable frequency response range is required, and the characteristic curve within the range should be as smooth as possible to improve sound quality and suppress acoustic feedback. The same sound pressure, and the sound with different frequencies is different when applied to the microphone . The frequency response characteristic is usually expressed by the number of decibels in which the sensitivity in the passband range differs. The wider the passband range, the less the decibel number of the difference, indicating that the frequency response characteristic of the microphone is better, that is, the frequency distortion of the microphone is small.
3. Directivity:
The sensitivity of the microphone to the sound in different directions will be different. This is called the directionality of the microphone . Directionality is related to frequency, and the higher the frequency, the stronger the directivity. In order to ensure the sound quality, the microphone should be required to have a relatively uniform directionality within the frequency response range. The directionality is represented by the difference in sensitivity between the front 0° direction and the back 180° direction of the microphone , and the difference is greater than 15 dB, which is called a strong directional microphone . The product specification often gives the direction of the polar coordinate response curve of the main frequency. The general types are: single-directional "heart shape"; bidirectional "eight-shaped"; and non-directional "circular"; Directivity "super heart type". The directionality of the microphone sensitivity is an important factor in selecting a microphone . Some microphones are unidirectional, others are omnidirectional, and some are somewhere in between, and their directionality is heart-shaped.
The omnidirectional microphone has the same performance for picking up sound from all directions. It is more appropriate to use such a microphone when the speaker wants to move back and forth, but it is not suitable for use in environments with high environmental noise.
The sensitivity of the heart-shaped microphone to the heart is heart-shaped in the horizontal direction, and the front side sensitivity is slightly smaller on the side and the back side is the smallest. This type of microphone has excellent performance in a variety of sound reinforcement systems.
Uni-directional microphone, also known as super-cardioid microphone, it's sharper than the directional cardioid microphone, high sensitivity positive, rapid decay in other directions sensitivity, especially for high-noise environments.
4, the output impedance:
From both ends of the wire into the microphone of the microphone itself is called impedance output impedance. Currently common microphones have high impedance and low impedance. The high-impedance value is about 1000~20000 ohms, which can be directly connected to the amplifier; the low-impedance type is 50-1000 ohms, which can be connected to the amplifier after being matched by the transformer. The output voltage of the high group is slightly higher, but the bypass function of the lead capacitor is larger, which causes the high frequency to drop, and is also susceptible to external electromagnetic field interference. Therefore, the microphone lead should not be too long, generally 10 to 20 meters. should. The low-impedance output does not have this defect, so the noise level is low, the microphone leads can be lengthened accordingly, and some low-impedance microphone leads with a loudspeaker can reach 100 meters. If the distance is longer, a preamp should be added.
Microphones are generally classified into moving coil type, crystal type, carbon type, aluminum belt type and capacitive type. The most commonly used ones are moving coil microphones and condenser microphones. The former is durable and cheap. Delicate, high price, but excellent in characteristics.
The moving coil microphone is a change of air pressure caused by the acoustic wave induced by the diaphragm, and the coil cutting magnetic field line placed in the magnetic field generates a weak current signal corresponding to the change of the sound pressure intensity. Usually, the dynamic microphone has low noise, no need to feed power, easy to use, and stable and reliable performance.
At the heart of the condenser microphone is a capacitive sensor. The two poles of the capacitor are separated by a narrow air gap, which forms the dielectric of the capacitor. When a voltage is applied between the two poles of the capacitor, the acoustic vibration causes a change in capacitance, and the current in the circuit also changes. By amplifying and outputting the signal, an audio signal of a relatively good quality can be obtained. In addition, there is a resident-stage condenser microphone , which uses a resident body material to make a microphone diaphragm electrode, which can work without external polarization voltage, and simplifies the structure. Therefore, the microphone is very compact and inexpensive, and also has the characteristics of a condenser microphone . It is widely used in various audio equipment and sound collection environments. The condenser microphone has high sensitivity, good frequency response and good sound quality.
To choose the right microphone for you, it is important to understand the meaning of the main technical indicators of the various microphones . The following main technical indicators should be noted when purchasing a microphone :
1. Sensitivity:
At a frequency of 1KHz, pressure of 0.1 Pa predetermined sound input from the microphone front spindle 0 °, the output of the microphone open output voltage in 10mV / Pa. Sensitivity is related to the output impedance. Sometimes expressed in decibels, and 10V is specified as 10V/Pa. Since the microphone output is usually in the order of millivolts, the decibel value of the sensitivity is always negative.
2. Frequency response characteristics:
The sensitivity of the microphone on the 0° spindle varies with frequency. A suitable frequency response range is required, and the characteristic curve within the range should be as smooth as possible to improve sound quality and suppress acoustic feedback. The same sound pressure, and the sound with different frequencies is different when applied to the microphone . The frequency response characteristic is usually expressed by the number of decibels in which the sensitivity in the passband range differs. The wider the passband range, the less the decibel number of the difference, indicating that the frequency response characteristic of the microphone is better, that is, the frequency distortion of the microphone is small.
3. Directivity:
The sensitivity of the microphone to the sound in different directions will be different. This is called the directionality of the microphone . Directionality is related to frequency, and the higher the frequency, the stronger the directivity. In order to ensure the sound quality, the microphone should be required to have a relatively uniform directionality within the frequency response range. The directionality is represented by the difference in sensitivity between the front 0° direction and the back 180° direction of the microphone , and the difference is greater than 15 dB, which is called a strong directional microphone . The product specification often gives the direction of the polar coordinate response curve of the main frequency. The general types are: single-directional "heart shape"; bidirectional "eight-shaped"; and non-directional "circular"; Directivity "super heart type". The directionality of the microphone sensitivity is an important factor in selecting a microphone . Some microphones are unidirectional, others are omnidirectional, and some are somewhere in between, and their directionality is heart-shaped.
The omnidirectional microphone has the same performance for picking up sound from all directions. It is more appropriate to use such a microphone when the speaker wants to move back and forth, but it is not suitable for use in environments with high environmental noise.
The sensitivity of the heart-shaped microphone to the heart is heart-shaped in the horizontal direction, and the front side sensitivity is slightly smaller on the side and the back side is the smallest. This type of microphone has excellent performance in a variety of sound reinforcement systems.
Uni-directional microphone, also known as super-cardioid microphone, it's sharper than the directional cardioid microphone, high sensitivity positive, rapid decay in other directions sensitivity, especially for high-noise environments.
4, the output impedance:
From both ends of the wire into the microphone of the microphone itself is called impedance output impedance. Currently common microphones have high impedance and low impedance. The high-impedance value is about 1000~20000 ohms, which can be directly connected to the amplifier; the low-impedance type is 50-1000 ohms, which can be connected to the amplifier after being matched by the transformer. The output voltage of the high group is slightly higher, but the bypass function of the lead capacitor is larger, which causes the high frequency to drop, and is also susceptible to external electromagnetic field interference. Therefore, the microphone lead should not be too long, generally 10 to 20 meters. should. The low-impedance output does not have this defect, so the noise level is low, the microphone leads can be lengthened accordingly, and some low-impedance microphone leads with a loudspeaker can reach 100 meters. If the distance is longer, a preamp should be added. First let's talk about the types of microphones:
Microphones are generally classified into moving coil type, crystal type, carbon type, aluminum belt type and capacitive type. The most commonly used ones are moving coil microphones and condenser microphones. The former is durable and cheap. Delicate, high price, but excellent in characteristics.
The moving coil microphone is a change of air pressure caused by the acoustic wave induced by the diaphragm, and the coil cutting magnetic field line placed in the magnetic field generates a weak current signal corresponding to the change of the sound pressure intensity. Usually, the dynamic microphone has low noise, no need to feed power, easy to use, and stable and reliable performance.
At the heart of the condenser microphone is a capacitive sensor. The two poles of the capacitor are separated by a narrow air gap, which forms the dielectric of the capacitor. When a voltage is applied between the two poles of the capacitor, the acoustic vibration causes a change in capacitance, and the current in the circuit also changes. By amplifying and outputting the signal, an audio signal of a relatively good quality can be obtained. In addition, there is a resident-stage condenser microphone , which uses a resident body material to make a microphone diaphragm electrode, which can work without external polarization voltage, and simplifies the structure. Therefore, the microphone is very compact and inexpensive, and also has the characteristics of a condenser microphone . It is widely used in various audio equipment and sound collection environments. The condenser microphone has high sensitivity, good frequency response and good sound quality.
To choose the right microphone for you, it is important to understand the meaning of the main technical indicators of the various microphones . The following main technical indicators should be noted when purchasing a microphone :
1. Sensitivity:
At a frequency of 1KHz, pressure of 0.1 Pa predetermined sound input from the microphone front spindle 0 °, the output of the microphone open output voltage in 10mV / Pa. Sensitivity is related to the output impedance. Sometimes expressed in decibels, and 10V is specified as 10V/Pa. Since the microphone output is usually in the order of millivolts, the decibel value of the sensitivity is always negative.
2. Frequency response characteristics:
The sensitivity of the microphone on the 0° spindle varies with frequency. A suitable frequency response range is required, and the characteristic curve within the range should be as smooth as possible to improve sound quality and suppress acoustic feedback. The same sound pressure, and the sound with different frequencies is different when applied to the microphone . The frequency response characteristic is usually expressed by the number of decibels in which the sensitivity in the passband range differs. The wider the passband range, the less the decibel number of the difference, indicating that the frequency response characteristic of the microphone is better, that is, the frequency distortion of the microphone is small.
3. Directivity:
The sensitivity of the microphone to the sound in different directions will be different. This is called the directionality of the microphone . Directionality is related to frequency, and the higher the frequency, the stronger the directivity. In order to ensure the sound quality, the microphone should be required to have a relatively uniform directionality within the frequency response range. The directionality is represented by the difference in sensitivity between the front 0° direction and the back 180° direction of the microphone , and the difference is greater than 15 dB, which is called a strong directional microphone . The product specification often gives the direction of the polar coordinate response curve of the main frequency. The general types are: single-directional "heart shape"; bidirectional "eight-shaped"; and non-directional "circular"; Directivity "super heart type". The directionality of the microphone sensitivity is an important factor in selecting a microphone . Some microphones are unidirectional, others are omnidirectional, and some are somewhere in between, and their directionality is heart-shaped.
The omnidirectional microphone has the same performance for picking up sound from all directions. It is more appropriate to use such a microphone when the speaker wants to move back and forth, but it is not suitable for use in environments with high environmental noise.
The sensitivity of the heart-shaped microphone to the heart is heart-shaped in the horizontal direction, and the front side sensitivity is slightly smaller on the side and the back side is the smallest. This type of microphone has excellent performance in a variety of sound reinforcement systems.
Uni-directional microphone, also known as super-cardioid microphone, it's sharper than the directional cardioid microphone, high sensitivity positive, rapid decay in other directions sensitivity, especially for high-noise environments.
4, the output impedance:
From both ends of the wire into the microphone of the microphone itself is called impedance output impedance. Currently common microphones have high impedance and low impedance. The high-impedance value is about 1000~20000 ohms, which can be directly connected to the amplifier; the low-impedance type is 50-1000 ohms, which can be connected to the amplifier after being matched by the transformer. The output voltage of the high group is slightly higher, but the bypass function of the lead capacitor is larger, which causes the high frequency to drop, and is also susceptible to external electromagnetic field interference. Therefore, the microphone lead should not be too long, generally 10 to 20 meters. should. The low-impedance output does not have this defect, so the noise level is low, the microphone leads can be lengthened accordingly, and some low-impedance microphone leads with a loudspeaker can reach 100 meters. If the distance is longer, a preamp should be added. First let's talk about the types of microphones:
Microphones are generally classified into moving coil type, crystal type, carbon type, aluminum belt type and capacitive type. The most commonly used ones are moving coil microphones and condenser microphones. The former is durable and cheap. Delicate, high price, but excellent in characteristics.
The moving coil microphone is a change of air pressure caused by the acoustic wave induced by the diaphragm, and the coil cutting magnetic field line placed in the magnetic field generates a weak current signal corresponding to the change of the sound pressure intensity. Usually, the dynamic microphone has low noise, no need to feed power, easy to use, and stable and reliable performance.
At the heart of the condenser microphone is a capacitive sensor. The two poles of the capacitor are separated by a narrow air gap, which forms the dielectric of the capacitor. When a voltage is applied between the two poles of the capacitor, the acoustic vibration causes a change in capacitance, and the current in the circuit also changes. By amplifying and outputting the signal, an audio signal of a relatively good quality can be obtained. In addition, there is a resident-stage condenser microphone , which uses a resident body material to make a microphone diaphragm electrode, which can work without external polarization voltage, and simplifies the structure. Therefore, the microphone is very compact and inexpensive, and also has the characteristics of a condenser microphone . It is widely used in various audio equipment and sound collection environments. The condenser microphone has high sensitivity, good frequency response and good sound quality.
To choose the right microphone for you, it is important to understand the meaning of the main technical indicators of the various microphones . The following main technical indicators should be noted when purchasing a microphone :
1. Sensitivity:
At a frequency of 1KHz, pressure of 0.1 Pa predetermined sound input from the microphone front spindle 0 °, the output of the microphone open output voltage in 10mV / Pa. Sensitivity is related to the output impedance. Sometimes expressed in decibels, and 10V is specified as 10V/Pa. Since the microphone output is usually in the order of millivolts, the decibel value of the sensitivity is always negative.
2. Frequency response characteristics:
The sensitivity of the microphone on the 0° spindle varies with frequency. A suitable frequency response range is required, and the characteristic curve within the range should be as smooth as possible to improve sound quality and suppress acoustic feedback. The same sound pressure, and the sound with different frequencies is different when applied to the microphone . The frequency response characteristic is usually expressed by the number of decibels in which the sensitivity in the passband range differs. The wider the passband range, the less the decibel number of the difference, indicating that the frequency response characteristic of the microphone is better, that is, the frequency distortion of the microphone is small.
3. Directivity:
The sensitivity of the microphone to the sound in different directions will be different. This is called the directionality of the microphone . Directionality is related to frequency, and the higher the frequency, the stronger the directivity. In order to ensure the sound quality, the microphone should be required to have a relatively uniform directionality within the frequency response range. The directionality is represented by the difference in sensitivity between the front 0° direction and the back 180° direction of the microphone , and the difference is greater than 15 dB, which is called a strong directional microphone . The product specification often gives the direction of the polar coordinate response curve of the main frequency. The general types are: single-directional "heart shape"; bidirectional "eight-shaped"; and non-directional "circular"; Directivity "super heart type". The directionality of the microphone sensitivity is an important factor in selecting a microphone . Some microphones are unidirectional, others are omnidirectional, and some are somewhere in between, and their directionality is heart-shaped.
The omnidirectional microphone has the same performance for picking up sound from all directions. It is more appropriate to use such a microphone when the speaker wants to move back and forth, but it is not suitable for use in environments with high environmental noise.
The sensitivity of the heart-shaped microphone to the heart is heart-shaped in the horizontal direction, and the front side sensitivity is slightly smaller on the side and the back side is the smallest. This type of microphone has excellent performance in a variety of sound reinforcement systems.
Uni-directional microphone, also known as super-cardioid microphone, it's sharper than the directional cardioid microphone, high sensitivity positive, rapid decay in other directions sensitivity, especially for high-noise environments.
4, the output impedance:
From both ends of the wire into the microphone of the microphone itself is called impedance output impedance. Currently common microphones have high impedance and low impedance. The high-impedance value is about 1000~20000 ohms, which can be directly connected to the amplifier; the low-impedance type is 50-1000 ohms, which can be connected to the amplifier after being matched by the transformer. The output voltage of the high group is slightly higher, but the bypass function of the lead capacitor is larger, which causes the high frequency to drop, and is also susceptible to external electromagnetic field interference. Therefore, the microphone lead should not be too long, generally 10 to 20 meters. should. The low-impedance output does not have this defect, so the noise level is low, the microphone leads can be lengthened accordingly, and some low-impedance microphone leads with a loudspeaker can reach 100 meters. If the distance is longer, a preamp should be added.
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