Definition and characteristics of DSD
The full name of DSD is Direct Stream Digital, which belongs to Sony and Philips. This is a technology that uses pulse density modulation coding to store audio signals on digital media. The application object of this technology is SACD, which is also a music CD specification jointly developed by Sony and Philips. After the invention of CD, it is a new product that successfully surpasses the recording quality of CD.
The DSD signal itself is stored as modulated digital audio, and the continuous sequence of 1bit is sampled at the frequency of 64 times the sampling rate of CD, that is, 2-point 8224MHz, which reduces the noise and loss caused by inaccurate audio signals in the past to the error range of 1bit. The sound quality of DSD coding is very dynamic in the middle and low frequencies, the phase error in high frequencies is extremely low, and noise appears at extremely high frequencies far above the human ear limit, which makes DSD format have excellent sound quality performance.