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Whatever happened to "1 Bit" DACs?

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  • Whatever happened to "1 Bit" DACs?

    Remember back in the early 1990's when "1 Bit" Dacs were a popular alternative to traditional ladder Dacs? Whatever happened to them? Did anyone ever come up with a 24bit compatible "1 Bit" Dac? Are there any products still using "1 Bit" Dacs today?

    PS - "1 Bit" Dacs are also known as "Pulse Converter" type Dacs
    Last edited by JCOConnell; 10-05-2016, 07:59 PM.
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  • #2
    I think they are actually more common in consumer electronics Delta Sigma DACs are. Why do I sound like Yoda?

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    • Rust
      Rust commented
      Editing a comment
      As long as look like him you do not.

    • JCOConnell
      JCOConnell commented
      Editing a comment
      I read they are used in cheap DVD players, so yes, they must have developed 24 bit versions.

  • #3
    The late Jerry Ozment's Jadis JS-1 was one of the cream of the crop of "I Bit" DACs at the time.

    Soc

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    • #4
      Wouldn't any DAC that does DSD be a 1 bit DAC?
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      • #5
        Originally posted by Beaur View Post
        Wouldn't any DAC that does DSD be a 1 bit DAC?
        I think DSD encoding is different than PCM
        Magnepan 1.6 QR Loudspeakers, Amherst A-2000 MOSFET 150 WPC Amp, Conrad Johnson PV-10A Modded Tube Line & Phono Stage, Electrocompaniet MC II Class A Head Amp, Audio Technica AT-OC9XML Cart (Stereo) , Graham Engineering 2.2 Tonearm (Stereo) , VPI Aries-1 Turntable (Stereo) , VPI Clamp, Denon DL-102 Cart, (Mono) , Luxman Tonearm (Mono) , Kenwood KD-500 Turntable (Mpmp) , Michell Clamp, Marantz 20B Analog FM Tuner, Pioneer SACD, Onkyo DX-6800 CD Transport, DIY 24B/192K DAC, Sennheiser HD-650 Headphones, Headroom Max Balanced Headphone Amp, DIY Silver Interconnects

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        • #6
          This can get really geeky and my digital knowledge peaked in 2001 LOL I'll give it a try though.

          Yes there are 24bit DR capable Delta Sigma Dacs. I believe even higher. Here's where it gets confusing. Delta Sigma DACs are used in PCM as well as PWM and DSD's PPM applications. In a nutshell how they differ from a straight up typical multibit DAC is that the data stream is in pulses instead of numbers. They are then decoded and converted into voltage steps into the analog realm.

          Let's get even more confusing! Some DSD capable players are actually PCM DACs. Using laptops or home computers as the transport these are fed the stream via USB via DoP. This was developed I believe by Andreas Koch and company. Some DSD DACs are native and THEN there are a handful of players/DACs that are DSD which convert non DSD files (of which there are too many to mention) into DSD.

          The thing about Delta Sigma DACs is that the chips are easy and cheap to make. They can also be made very, very small. Ladders more expensive and larger but also less prone to poor sound since the need for noise shaping is a lot less. Some in fact choose to filter only on the analog end.

          I hope I got that right!

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