In all decoders, in all digital audio devices, there is a component called "clock". It can be an independent crystal oscillator and can be integrated into the chip, but its function is the same, which determines the "time base" of the whole equipment when it works. We know that the principle of digital audio is to "sample" a continuously changing analog signal at a frequency of 44. 1 kHz (CD specification) or higher (such as 96 kHz) to obtain a series of values. When playing music, the analog signal must be reconstructed according to this sampling frequency.

In this process, the frequency accuracy of sampling and reconstruction is very important, which will directly affect the accuracy of reconstructed analog signals. Therefore, the accuracy of the "clock" in the decoder will significantly affect the sound. Nowadays, many high-end decoders use high-precision crystal oscillators. For example, the Veaa decoder mentioned above uses the so-called "femtosecond clock", which has the characteristics of femtosecond accuracy and extremely low iitter, and brings high sound quality.