Generally speaking, audio decoder can be divided into two types: one is pure audio decoder for hi fi listening, that is, after the digital audio source equipment such as CD player is divided into two parts, the part of turntable (drive CD-ROM to rotate and read disk) is removed. The main function of pure audio decoder is to convert the digital audio information read into analog audio signal output for power amplification and playback. So strictly speaking, pure audio decoder should be called D / a (digital / analog) converter. The other is AV video decoder, which is commonly used in "home theater" equipment. Its main function is to decode and restore the encoded multi-channel audio information during recording, and then supply power for amplification and playback after D / a conversion. Many dual or multi-channel listening systems are not equipped with decoders, but they can also achieve dual or multi-channel playback. Why? There are two reasons for these two situations. One is that there is no digital or encoded audio source in the system, that is, direct playback of analog audio signal (usually at most two channels, if it is "multichannel", it is only a pseudo multichannel connected in parallel in series); the other is that the decoding function has been integrated into the audio source or power amplifier and other devices, such as the CD player has included digital / analog Conversion circuit, some DVD players include some kind of audio format digital decoding, some digital decoding is built in the AV power amplifier.
What's the difference between the integration of editing audio decoding in sound source and power amplifier and the use of a separate decoder? Generally speaking, when separate decoder is not integrated with CD player, DVD player and AV power amplifier, mutual interference between circuits can be reduced, which is conducive to improving technical parameters and sound quality. But does this mean that the sound quality of the separated equipment must be better than that of the combined equipment, and the index parameters must be higher? It can't be said that there must be a premise for the comparison between the two, that is, the grade (usually reflected in the price) is the same or similar, otherwise the principle that the high price combined equipment performs better than the low price split equipment can't be explained. In addition, they have their own advantages in the use and operation. The use of a separate decoder is more flexible and more flexible, while the integration of decoding functions in other devices is more convenient and simple in the use of connection and operation. From this point of view, the difference between them is mainly the difference in function setting mode.
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