DSD is often promoted as a superior audio format over PCM, yet much confusion persists regarding what it actually is and how it works. We shall approach the matter in a way that will hopefully clear up some of this.
Sampling and reconstruction
Sampling and reconstruction are cornerstones of modern digital audio processing. We take a closer look at these processes and the limitations they impose.
Linear and minimum phase
A never-ending debate is that of linear versus minimum phase filters with proponents of each often deriding the other as unnatural or even unlistenable. We explore the meaning of these terms and how the differences can impact an audio signal.
There exists a widespread belief that digital low-pass filters introduce an audible ringing effect when applied to music. We investigate the phenomenon.
Time resolution of digital audio
A frequent claim by detractors of digital audio is that the time resolution is equal to the sampling interval, 22.7 μs for the CD format. This is incorrect. Although there is a limit, it is much smaller, and it does not depend on the sample rate.
Over the years, various enhancements to the CD format have been marketed with promises of higher sound quality through the use of superior materials. One of the more recent entrants is UHQCD. We examine the performance of a CD player while playing such a disc.