The A/D internally contains 2 distinct processes: Its first wide market entry was not until later in the 1980’s when it was used as an intermediate format inside A/D and D/A converter chips.įigure 1 shows how an analog source is converted to digital PCM through the A/D converter and then back again to analog via the D/A converter. It is nothing else than processed Delta-Sigma modulation first developed by Philips in the 1970’s.
The term Direct Stream Digital (DSD) was coined by Sony and Philips when they jointly launched the SACD format. This paper explains the background and nature of DSD and what might happen to it in the near future. What were compelling reasons to use this encoding scheme for SACD over 10 years ago are now becoming convenient truths for the new era of high resolution internet audio. It is only recently with the growing interest in downloading high resolution audio via the internet that DSD surged to the surface of news coverage. Direct Stream Digital (DSD) actually has been around for a while already, but it has been so married to a physical media, SACD, that it has yet to receive the attention from audiophiles that it deserves.
A new drug – no, but a new “can’t-be-without-it-anymore” audio format bursting into our listening rooms.
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