If you are not a big fan of Sony, or an audio enthusiast, I am not sure what LDAC is. Therefore, the editor believes that it is necessary to talk about LDAC, because it is likely to have a significant impact on the future pattern of wireless headphones and speakers.
What does ldac mean? What is ldac technology?LDAC is a wireless audio coding technology developed by Sony. It was first unveiled at the CES Consumer Electronics Show in 2015. At the time, Sony stated that LDAC technology was three times more efficient than standard Bluetooth encoding and compression systems. In this way, those high-resolution audio files will not be excessively compressed when wirelessly transmitted, so that the sound quality will be greatly lost.
The reason why Sony's decision is quite concerned is that LDAC technology was almost "Sony only" in the past, only applied to its own mobile phones, players, headphones, Bluetooth speakers. Because LDAC technology relies on the simultaneous support of audio sources and speaker systems, this makes the technology an exclusive highlight of Sony equipment. Now, as long as it is a mobile phone with Android O installed, it can use LDAC to allow users to enjoy wireless high-definition music on a playback system that supports the technology.
We all know that the sound quality of Bluetooth headsets is generally inferior to that of wired headsets, in which insufficient transmission bandwidth is an important reason. But what Zhihuijun wants to say is that Bluetooth ca n’t be blamed for the lack of transmission bandwidth, because after Bluetooth 3.0, the transmission bandwidth has been increased to more than 24Mbps, even if the actual rate is more than half of it, it is much higher than CD lossless music (1.41Mbps ) Requirements. But currently Bluetooth sound quality is still at the lossy level of MP3, the culprit is the transmission protocol.
Bluetooth transmission of audio mainly relies on the A2DP protocol, which was established in the early days of the Bluetooth standard. At that time, it did not take into account the current situation and limited the amount of data during transmission, so that the audio data can only reach up to about 328kbps. So even though the new Bluetooth standard brings more speed, the A2DP protocol has not been updated.
Since the A2DP protocol cannot be changed, if you want to improve the sound quality of Bluetooth, you can only start with the optimization of compression and encoding. Based on this, SBC, AAC, and apt-X encoding specifications have been generated. Among the three specifications, SBC is the most common. Basically, all smart phones, Bluetooth headsets and speakers are supported. The maximum allowable rate of SBC is mono-channel 320kbit / s and dual-channel 512kbit / s audio transmission. The algorithm is not good enough, so the sound quality performance is not ideal.
AAC is currently mainly used by Apple. IPhone, iPad and other devices support AAC. Although the supported rate is not much improved compared to SBC, the algorithm is better and the sound quality is also improved.
Unlike traditional Bluetooth encoding technologies such as SBC, LDAC transmits high-resolution audio content without any degradation, and allows the device to transmit more data through wireless means, resulting in better sound quality performance. According to Sony, this is mainly due to "more efficient coding and optimized information packaging."
When transmitting LPCM high-resolution audio, LDAC technology can maintain its maximum bit depth and frequency response range, and even high-quality transmission can be achieved even for 96 kHz / 24 bit audio. In contrast, the traditional Bluetooth audio transmission technology, before transmitting LPCM audio, the first thing to do is to "degrade" the high-resolution video to a CD quality of 44.1 kHz / 16 bit, and then pass 328 kbps transmission, which is equivalent Due to two large amounts of information loss, the final quality is far from CD quality.
LDAC transmission modeLDAC provides three transmission modes, the first is the 990 kbps mode with quality as the highest priority, the second is the default normal mode of 660 kbps, and the last is the 330 kbps mode similar to the ordinary Bluetooth standard, mainly to ensure the connection quality. In the screenshot of the Android O developer preview, we can see that LDAC also provides these three transmission modes in the system.
It should be noted that what LDAC transmits is also a lossy audio, not lossless. This point Sony does not deny that it indicates that the audio after transmission is no longer "high resolution", and it is called " High-quality "audio. However, the official claimed that even so, the loss of information caused by the transmission of LDAC is still much less than the traditional Bluetooth transmission.
The biggest feature of LDAC technology is that it ensures that the wireless audio transmission can also have enough information, which is implemented into the actual music listening sense, that is, the sound is fuller. The traditional Bluetooth transmission is shriveled and lacking due to lack of information, as if listening to a voice without emotion, only some recognizable melody remains. With the support of LDAC technology, the density and intensity of the sound are higher, the music details are richer, and the low frequency is also deeper. Not only is it an empty volume, but the "texture" is stronger.
Of course, you can't expect LDAC's hearing to compete with wired connections. Considering the gap between the transmission rate and the anti-interference ability of the two, this is really unrealistic. However, the quality of wireless music in the LDAC environment is indeed very close to wired.
It is worth noting that LDAC transmission does not mean that it can magically make low bit rate audio also exceed its own level, because this technology solves the problem of wireless transmission bandwidth. Therefore, within a certain limit, the higher the audio bit rate, the more the potential of LDAC can be realized.
However, LDAC has some flaws in the experience. The first is that its power consumption will be significantly higher than ordinary Bluetooth. In addition, the quality priority mode of LDAC is easily interfered by wireless signals such as Wi-Fi, and the sound will appear intermittent. At this time, we have to choose a mode with a lower transmission rate.
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