EvelynAtencio Posted December 9, 2015 Report Share Posted December 9, 2015 Does anyone know what an "Advanced Pulse Digital Converter" is? (Sony CXD8505Q - CXD2515Q). It is in a Sony CDP-XA1ES. IIRC, either the JA20ES or JB930 has the 8505BQ DAC, which is a current pulse. So what is the difference between a "current pulse" and "advanced pulse" DAC? Is "advanced somehow different from "hybrid"? I'm no EE, so the simpler the explanation, the better. I am not being lazy here, as I did some poking around on the web, but did not find anything comprehensible to me. Quote Link to comment Share on other sites More sharing options...
freddyjollo Posted December 10, 2015 Report Share Posted December 10, 2015 sounds like a salemans lingo? to charge more money? cynical arnt I? Quote Link to comment Share on other sites More sharing options...
bluecrab Posted December 10, 2015 Report Share Posted December 10, 2015 Not sure why you reposted my question from 23 OCT 2014 here (http://forums.sonyinsider.com/topic/28901-advanced-pulse-dac/), but since you did: The short story: Advanced Pulse DAC is possibly a multibit (hybrid) DAC (as opposed to a 1-bit DAC). I had the XA1ES and was also curious. It is generally thought that 1-bit DACs are a better way to go in MD/CD. Freddy, I believe you are correct that it is not only sales/marketing lingo, but Sony-specific at that. Sony calls its 1-bit DACs "current pulse" and most of its multibits "hybrid pulse." Of course, Sony's terminology is its own, so who really knows? Only Sony knows if "advanced pulse" = "hybrid pulse." I did find this, regarding the 8505Q as deployed in the JA3ES: The JA3ES deck uses Sony's new CXD-8505Q D/A converter chip, which was developed for their latest generation CD players. This chip accepts a 20-bit digital data stream, which is converted by CXC-8505Q's first stage into an equivalent 22-bit signal, before passing it to the second stage which converts it into a stream of one-bit PWM pulses. Now let's take a look at the 8505* series DACs and some of the places they are found. As you note—actually, as I noted—the 8505Q is found in the CDP-XA1ES. Its next iteration, the 8505AQ, is found in the CXD-XA70/80ES. I believe that is a 1-bit DAC. Finally the 8505BQ is in the CDP-XA20ES...definitely 1-bit or in Sonyspeak, "current pulse." Both the JB930 and the XA20ES use the CXD-8735N-TP DAC, as noted in their respective service manuals. Bottom line: 8505BQ > 8505AQ > 8505Q. The CXD-8735N-TP is 1-bit. CXD8735N-TP Quote Link to comment Share on other sites More sharing options...
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