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Hi-Rez Audio?

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    #16
    Re: Hi-Rez Audio?

    Originally posted by HeadHodge View Post
    ....snip....But my questions might be silly because I don't think I understand the topic very well. But I'll spend some time on it, to see if I can come up with some intellegent questions.....snip....
    I've been told that occasionally even a blind squirrel finds a nut.

    Comment


      #17
      Re: Hi-Rez Audio?

      Originally posted by Nded View Post
      I've been told that occasionally even a blind squirrel finds a nut.
      The AABS (American Association for Blind Squirrels) gives you thanks. You have given hope to all Blind Squirrels all across the entire forest.

      Comment


        #18
        Re: Hi-Rez Audio?

        Originally posted by HeadHodge View Post
        I

        So I was just wondering out loud that since the VUDU box can output PCM and my TV can receive and process PCM, if it would be possible to bypass the Broadcom chip with higher audio quality output via the PCM avenue. This was all based on the assumption that there is a higher quality audio trapped inside the box and can't get out through the Broadcom chip.
        PCM is simply the way that the analog audio signal gets coded into a digital bitstream. As I stated before, it's quite possible that Dolby Digital is also a PCM audio stream (I haven't looked up the specs, but PCM is the most common method of sampling an audio waveform). Dolby Digital is an audio format that consists of different sets of channels (2, 2.1, 5.1, 6.1, 7.1, etc). I believe these channels are all individually encoded and all multiplexed into the datastream. Additionally, there is information on the spacial orientation of the different channels as well.

        I think you are hung up on this idea of PCM as an audio format. PCM in and of itself really isn't an audio format. Traditionally, PCM has been meant to mean 2 channel stereo audio as opposed to Dolby Digital or DTS. I'm not sure what "Hi-Res" PCM is other than the fact that it's probably more of a marketing term than anything else.

        Here's a Wiki Link to PCM. I think you'll see it states thing pretty similar to what I stated: http://en.wikipedia.org/wiki/PCM

        I looked for a Wiki entry on Hi-Res PCM but could not find it.

        It's not possible to bypass the Broadcom chip as it is the CPU of the box. It handles all the processing of the audio and video.

        There's a number of other discussions in the forums here about the audio format in DD+ encoding on the Vudu. At least I think they are in the public forums!

        Bottom line: What you ask is not possible.

        Comment


          #19
          Re: Hi-Rez Audio?

          Originally posted by NA9D View Post
          I think you are hung up on this idea of PCM as an audio format. PCM in and of itself really isn't an audio format. Traditionally, PCM has been meant to mean 2 channel stereo audio as opposed to Dolby Digital or DTS. I'm not sure what "Hi-Res" PCM is other than the fact that it's probably more of a marketing term than anything else.

          Bottom line: What you ask is not possible.
          Thanks for putting up with me.

          I could be wrong, but I do think I do understand the role of PCM plays in the process.

          I also believe you that what I'm asking may not be possible.

          It's just that whether I'm right or wrong, I would feel good if I knew that you understand my question. And I'm still not sure about that.

          It might be hard to see it from my perspective because you know what's under the hood, and I don't.

          If you go to the VUDU settings you can specify whether the box spits out PCM or DD5.1 to your TV. So from my perspective, I'm thinking there must be some decoding/encoding software that takes the native DD+ and converts it to one format or the other, depending on the VUDU setting you picked.

          So then if that's true, then one would think that it would be possible to modify the decoding/encoding (codec) software and modify the PCM output to spit out multi-channel audio instead of just stereo.

          But I think from your last post you may be implying that the DD+ is stuffed into the Broadcom chip and you select the hardware (via Pins 7 & 23 of course) to spit out either DD5.1 or PCM stereo. So if that's the case, I could see where you would not be able to really do much about it.

          Anyways, put my Pink med glasses on for a minute and hopefully you will get my meaning.

          Thanks NA9D!!!

          BTW My Aquos TV only supports PCM but my Bose system supports both via Coax or Toslink digital.

          Regards

          Comment


            #20
            Re: Hi-Rez Audio?

            OK. Let me try again:

            PCM is a format for sampling the analog wave form.

            It is typically used to refer to 2 channel non-DolbyDigital content. It has no other special processing or spatial relation information in the stream - it's simply the audio data. Any surround processing like ProLogic is done based on the phase difference between the waveforms in each channel.

            When you set the Vudu to output PCM, you set it to output stereo audio. Period.

            Your TV is likely not to support Dolby Digital for an input because it doesn't make sense for a device with 2 speakers.

            I know what you are asking.

            Comment


              #21
              Re: Hi-Rez Audio?

              Originally posted by NA9D View Post
              OK. Let me try again:

              PCM is a format for sampling the analog wave form.

              It is typically used to refer to 2 channel non-DolbyDigital content. It has no other special processing or spatial relation information in the stream - it's simply the audio data. Any surround processing like ProLogic is done based on the phase difference between the waveforms in each channel.

              When you set the Vudu to output PCM, you set it to output stereo audio. Period.

              Your TV is likely not to support Dolby Digital for an input because it doesn't make sense for a device with 2 speakers.

              I know what you are asking.
              Thanks Shultzie....

              I'm done (for now!!! )

              Comment


                #22
                Re: Hi-Rez Audio?

                Originally posted by Nded View Post
                I've been told that occasionally even a blind squirrel finds a nut.
                Unfortunately, even when you a find a nut, it always seems to be one tough nut to crack!!

                Comment


                  #23
                  Re: Hi-Rez Audio?

                  Originally posted by NA9D View Post
                  OK. Let me try again:

                  PCM is a format for sampling the analog wave form.

                  It is typically used to refer to 2 channel non-DolbyDigital content. It has no other special processing or spatial relation information in the stream - it's simply the audio data. Any surround processing like ProLogic is done based on the phase difference between the waveforms in each channel.

                  When you set the Vudu to output PCM, you set it to output stereo audio. Period.

                  Your TV is likely not to support Dolby Digital for an input because it doesn't make sense for a device with 2 speakers.

                  I know what you are asking.
                  I have discs with DD that range from 1.0, 1.1, 2.0, 2.1 to 6.1. Anything from 1 channel to 7 channels. And of course with HD up to 8 channels with the newer audio codecs.
                  Most of the PCM content I listen to is between 5.1 and 7.1. It's a very rare occasion that I will be listening to 2 channel PCM audio.
                  Everything I watch on TV is encoded in DD since I only watch the HD channels and the audio from all the HD channels are in Dolby DIgital.

                  Comment


                    #24
                    Re: Hi-Rez Audio?

                    Originally posted by aaronwt View Post
                    I have discs with DD that range from 1.0, 1.1, 2.0, 2.1 to 6.1. Anything from 1 channel to 7 channels. And of course with HD up to 8 channels with the newer audio codecs.
                    Most of the PCM content I listen to is between 5.1 and 7.1. It's a very rare occasion that I will be listening to 2 channel PCM audio.
                    Everything I watch on TV is encoded in DD since I only watch the HD channels and the audio from all the HD channels are in Dolby DIgital.
                    Right, maybe I should have stated that PCM is generally used as a generic term for a bit stream when it isn't DD or DTS encoded. PCM is simply the method by which the analog waveform gets converted to a stream of 1's and 0's.

                    Comment

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