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1 bit D/A converter in discman ?

post #1 of 7
Thread Starter 
WHat is 1 bit D/A converter mean in discman ? i know what D/A converter is, but what is one bit ? how many bits are there ?
this is from my old discman.

do new discmans still have this 1 bit D/A thing ? or are they better ?
post #2 of 7
Single-bit-converters are still pretty much the standard for pcdps - for standalone cpds, the trend has already turned back to multi-bit since a few years. For the working principle, you'd best google for it, there are plenty of good explanations on the web. The short story is that single-bit-converters replace what multi-bitters represent by a sum of discrete voltages corresponding to the significance of the bits by a highly oversampled stream of single bit steps.

As to how many bits are there: on a redbook cd, it's usually 16.

Greetings from Hannover!

Manfred / lini

P.S.: Single-bitters are cheaper to produce and need less voltage - good for portable...
post #3 of 7
Thread Starter 
but portabel CD players, they all are still 1 bit DAC arent they ?
post #4 of 7
Taken literally, your question is answered as follows: PCDPs have not always used 1-bit DACs, e.g., I'm pretty sure the classic Denon DCP-150 PCDP used a multi-bit Burr-Brown part. I think lini was saying that PCDPs nowadays generally use 1-bit DACs.

Why the sudden interest in the decoding scheme of PCDPs? With MP3 players using all flavors of DACs (c.f., the iPod with a multi-bit Wolfson DAC), I've long since lost track of the specs and conceded that sound is ultimately the deciding factor. After all, on one side you have a plethora of 24-bit DACs; on the other, you have SACD's 1-bit solution (which is not always implemented using 1-bit DACs, to further confuse the issue). It is highly debatable which one is better (again, use Google).
post #5 of 7
Thread Starter 
the reason was that i recently came to use my old PCDP, and it says 1 bit DAC, and weirdly enough, it sounds better than my new sony discman.
so i was curious to find out more about it.
post #6 of 7
some good info that is reasonably easy to understand on this technical topic...

http://electronics.howstuffworks.com/question620.htm
post #7 of 7
Quote:
Originally Posted by lini
Single-bit-converters are still pretty much the standard for pcdps - for standalone cpds, the trend has already turned back to multi-bit since a few years.
Not quite true for standalone CDPs, even today. Only the "expensive", low-capacity CDPs have multi-bit converters. Most low-end CDPs from the major brand names, and all "jukebox" CDPs sold in superstores, all still have single-bit DACs. (But then again, those big brand name companies reach very high price points for such low-end performance simply by piling on frivolous features on their units )
However, instead of a single-bit DAC that's shared between the two stereo channels, the low-end standalone CDPs may have a single-bit DAC for each stereo channel.
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