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.
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 96kHz / 24bit 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 44.1kHz / 16 bit, and then pass 328kbps transmission, which is equivalent to After two large losses of information, the final quality is far from the CD quality.
LDAC provides three transmission modes, the first is the 990kbps mode with quality as the highest priority, the second is the default normal mode of 660 kbps, and the last is the 330kbps 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.
aptX is an audio codec standard that integrates with the Bluetooth A2DP stereo audio transmission protocol. The traditional Bluetooth stereo audio coding standard is: SBC, commonly known as narrowband coding, aptX is a new coding standard introduced by CSR. Under the condition of SBC coding, the Bluetooth stereo audio transmission delay time is more than 120ms, while using the aptX coding standard, the Bluetooth stereo audio transmission delay time is 40ms. The delay that most people can feel is about 70ms. So, if the aptX standard is adopted, users will not feel the delay in actual use, just like watching TV with bare ears.
SBC is a public agreement, and the devices of various manufacturers can be well compatible with each other, and aptX is a private agreement of CSR. Therefore, from TVs to headphones / speakers, CSR software or chip technology is required To support it.
The emergence of aptX HD is related to the popularity of high-definition audio. It can support up to 24-bit / 48kHz audio, which means that we will be able to listen to music with better sound quality using wireless devices. Compared with the 352kbps ratio of traditional aptX, aptX HD has an advantage of increasing the bit rate to 576kbps. apt-X is currently divided into three categories, ordinary apt-X, apt-X HD and apt-X Low Latency.
Introduction to the difference between ldac_aptx and aptx hdAccording to the definition given by Sony, LDAC is an encoding technology that can wirelessly transmit high-resolution audio, allowing users to wirelessly transmit high-quality audio with an amazing code rate of 990kbps. Unlike traditional Bluetooth encoding technologies such as SBC, LDAC does not undergo any degradation when transmitting high-resolution audio content, and allows devices to transmit more data wirelessly, resulting in better sound quality performance. According to Sony, this is mainly due to "more efficient coding and optimized information packaging."
Sony LDAC is a high-quality audio codec solution based on Bluetooth connection. According to official data, it supports a high sampling rate of 24bit and supports a data volume of 990kbps. It provides 24bit / 96kHz compression encoding data transmission and decoding [FLAC 24bit / 96kHz typical compression coding rate is around 2350kbps]. And Sony's Walkman and other devices also measure the typical application of LDAC by transmitting FLAC of 24bit / 96kHz [such as the endurance nominal]. This standard is obviously much higher than apt-X, AAC, and may also be much higher than apt-X HD [may only support up to 48kHz]. Of course, LDAC also requires that both the transmitter and receiver support LDAC.
apt-X is a special coding standard in Bluetooth. It originally belonged to CSR. With the acquisition of CSR by Qualcomm, apt-X certification has become more commercialized, and the company's official website can not find many of the technologies. data. apt-X is currently divided into three categories, ordinary apt-X, apt-X HD and apt-X Low Latency. Prior to Qualcomm ’s acquisition of CSR, apt-X Lossless had demonstrated technical data superior to FLAC compression ratio, and now it seems that it is no longer mentioned, and the specification of apt-X HD has become 24bit high sampling rate and LPCM transmission technology The main point is that not many devices support apt-X HD certification.
To enjoy aptX HD, you must have the corresponding hardware, which is the so-called CSR8675 Bluetooth audio system-on-chip. It can not only support hard drives with higher bit rates, but also provide better digital signal processing. On the other hand, it also means that aptX HD cannot be obtained as a software upgrade, and you must purchase new hardware. However, aptX HD is backward compatible. If you use a headset that does not support HD, the transmission will automatically switch to the normal aptX.
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