Page 1 of 2 12 LastLast
Results 1 to 25 of 31
  1. #1
    ride a jet ski Tarheel_'s Avatar
    Join Date
    Nov 2003
    Location
    North Carolina
    Posts
    656

    Question Linear PCM audio...what the heck is it ?

    My Denon DVD-1000 has a few audio options...one for analog or digital and another for "LCPM SELECT ( 96 kHz ---> 48 kHz ) ". The manual says and i quote, "Use this to set the digital audio ouput when playing DVDs recorded in linear PCM audio."

    What the heck is it and how do i determine if its recorded in such a format? Thanks!!!

  2. #2
    Oldest join date recoveryone's Avatar
    Join Date
    Dec 1969
    Location
    California
    Posts
    1,383

    Wink Pcm

    Quote Originally Posted by Tarheel_
    My Denon DVD-1000 has a few audio options...one for analog or digital and another for "LCPM SELECT ( 96 kHz ---> 48 kHz ) ". The manual says and i quote, "Use this to set the digital audio ouput when playing DVDs recorded in linear PCM audio."

    What the heck is it and how do i determine if its recorded in such a format? Thanks!!!
    PCM was a sound format prior to DVD-A and SCAD,it ran into industry support problems. There are a few demo disk( The Ultimate DVD Series) out there that have music tracks with this format its sound good, a bit above normal CD's. Most newer or highend receivers will auto select over to 96khz or 48khz sound processing when playing a disk. Its only a stereo format. My down stairs unit (Pioneer Elite 26TX) plays it in both 96khz & 48khz, but the bedroom unit (Pioneer VSX D309) only plays the 48khz verison. The sound is full and very rich (I haven't heard a DVD-A or SCAD disk yet, but this forum is like sitting in on a studio recording with no mistakes

  3. #3
    M.P.S.E /AES/SMPTE member Sir Terrence the Terrible's Avatar
    Join Date
    Jul 2002
    Posts
    6,818
    Quote Originally Posted by Tarheel_
    My Denon DVD-1000 has a few audio options...one for analog or digital and another for "LCPM SELECT ( 96 kHz ---> 48 kHz ) ". The manual says and i quote, "Use this to set the digital audio ouput when playing DVDs recorded in linear PCM audio."

    What the heck is it and how do i determine if its recorded in such a format? Thanks!!!
    Linear PCM is the basis of a digital audio whether it be Dts, DD, or DVD-A(SACD is not PCM) . Select 96khz option, that way whatever stream is of the highest quality, your DVD player will recognize it and play it. If you choose the 48khz, no matter what sampling rate the audio is(could be 96khz) it will be truncated down to 48khz(not as good as 96khz sampling rate)

    CD's are PCM, two channel high sampling high bit rate DVD's are PCM, DVD-A's are PCM.
    Sir Terrence

    Titan Reference 3D 1080p projector
    200" SI Black Diamond II screen
    Oppo BDP-103D
    Datastat RS20I audio/video processor 12.4 audio setup
    9 Onkyo M-5099 power amp
    9 Onkyo M-510 power amp
    9 Onkyo M-508 power amp
    6 custom CAL amps for subs
    3 custom 3 way horn DSP hybrid monitors
    18 custom 3 way horn DSP hybrid surround/ceiling speakers
    2 custom 15" sealed FFEC servo subs
    4 custom 15" H-PAS FFEC servo subs
    THX Style Baffle wall

  4. #4
    Oldest join date recoveryone's Avatar
    Join Date
    Dec 1969
    Location
    California
    Posts
    1,383

    Cool

    Quote Originally Posted by Sir Terrence the Terrible
    Linear PCM is the basis of a digital audio whether it be Dts, DD, or DVD-A(SACD is not PCM) . Select 96khz option, that way whatever stream is of the highest quality, your DVD player will recognize it and play it. If you choose the 48khz, no matter what sampling rate the audio is(could be 96khz) it will be truncated down to 48khz(not as good as 96khz sampling rate)

    CD's are PCM, two channel high sampling high bit rate DVD's are PCM, DVD-A's are PCM.
    Hey Terrence, your last statement was a bit confusing, If CD's are PCM format how come they don't play/sound as a PCM disk does?

    And when I play a High-bit rate disk (PCM) my receiver clicks over to 96khz, but not with regular CD's. Both playing through DVD player .
    I respect your knowledge, but I feel you left me and others in the dark on this one. I understand the setting part on the player, but the difference of CD's, PCM (high bit-rate) CD's.

  5. #5
    Forum Regular Woochifer's Avatar
    Join Date
    Dec 2001
    Location
    SF Bay Area
    Posts
    6,890
    PCM is basically the carrier format used in CD audio and most other uncompressed digital audio formats. There are several varieties of PCM and they vary based on the bit depth and sampling rate. CD audio uses a 16-bit word length and a 44.1 kHz sampling rate.

    The DVD format requires the use of EITHER a Dolby Digital or PCM soundtrack. Because DD is a compressed format that can fit a 5.1 soundtrack into one-third of the space required by a two-channel 44.1/16 PCM (CD audio) track, most DVDs use DD as the audio carrier.

    However, there are a number of DVDs, mostly with music, that use PCM audio tracks with higher resolution than the 44.1/16 resolution of CDs. Subjectively, this can sound subtlely better than Dolby Digital. The higher resolution can range from bumping up the sampling rate to 48 or 96 kHz or increasing the bit depth from 16 to 20 or 24 bits. Some audiophile labels have issued discs with 96/24 PCM audio tracks, and the sound quality on these discs is superb. The advantage of these discs is that they can be played back on any DVD player and unlike DVD-A or SACD, the signal can be output digitally. Major record labels never got on board with 96/24 discs because it doesn't have the encryption schemes that you see with SACD and DVD-A.

    Your Denon DVD player allows for 96/24 resolution audio signals to get passed through the digital outputs. However, some discs with copyright protection do not allow for the audio to get output digitally at a 96 kHz sampling rate and require that the sampling rate step down to 48 kHz before the signal can be sent through the digital outs. Only with a few discs that contain PCM tracks with a 96 kHz sampling rate and copyright restrictions will you ever need to bother with that 96 ----> 48 kHz downconversion option in the DVD setup. On copyright protected discs, the signal output can only use the full 96 kHz sampling rate if it's decoded by the DVD player's internal DACs and output through the analog outputs.

    DVD-A is basically a format that plays back PCM tracks encoded at 192/24 (two-channel) or 96/24 (5.1) resolution. The DVD-A tracks are compressed, but during the playback the DVD-A player will restore the data discarded by the compression process prior to the digital-to-analog conversion.

    SACD uses a different format from PCM. Rather than sampling multibit words, SACD uses the DSD carrier, which uses one-bit word lengths sampled at very high rates. Supposedly this approximates analog waveforms better, but any valid comparison using SACD won't really happen until we start seeing more recordings done using DSD. Right now, almost all SACDs are converted from analog or PCM sources.

  6. #6
    Oldest join date recoveryone's Avatar
    Join Date
    Dec 1969
    Location
    California
    Posts
    1,383

    Talking

    Thx Woochifer. You hit the nail on the head

  7. #7
    ride a jet ski Tarheel_'s Avatar
    Join Date
    Nov 2003
    Location
    North Carolina
    Posts
    656

    exactly why i hang out here...

    any website that will distinguish these higher PCM recorded DVDs? I'm curious and would like to hear a few.

    Thanks everyone !!!

  8. #8
    Forum Regular Monstrous Mike's Avatar
    Join Date
    Dec 2001
    Posts
    335

    And just to expound for no reason...

    The term "linear" in Linear PCM means that each change in bit value represents the same change in the analog amplitude value. So a bit value of say 24 will represent an analog amplitude that is twice that of a bit value of 12. There are various reasons to use something other than linear like Differential PCM or Adaptive Differential PCM but that is another story.

    And when you see the term PCM, it usually means Linear PCM.

    In strict technical terms Pulse-Code Modulation is a system for transmitting digital data. Modulation is a method of carrying the digital data in an analog wave train. As you may or may not know, you can't just feed 1's and 0's onto a cable and send them on their way. They need to be represented or modulated. Then at the other end of the cable (or over the air or travelling around inside a component) they need to be demodulated.

    Pulse code is one of hundreds of ways of modulating/demodulating digital data. It is a fairly simple method which in the binary form simply has pulses and spaces representing the digital bits.

    Did you know PCM was invented in 1939! And it was first put to use in telephone transmission systems to have multiple phone links on the same transmission line (time division multiplexing).

    Yeh, I guess that's enough for today.
    Friends help friends move,
    Good friends help friends move bodies....

  9. #9
    M.P.S.E /AES/SMPTE member Sir Terrence the Terrible's Avatar
    Join Date
    Jul 2002
    Posts
    6,818
    Wooch,

    Thanks for turning the light on, sorry I left recoveryone in the dark.
    Sir Terrence

    Titan Reference 3D 1080p projector
    200" SI Black Diamond II screen
    Oppo BDP-103D
    Datastat RS20I audio/video processor 12.4 audio setup
    9 Onkyo M-5099 power amp
    9 Onkyo M-510 power amp
    9 Onkyo M-508 power amp
    6 custom CAL amps for subs
    3 custom 3 way horn DSP hybrid monitors
    18 custom 3 way horn DSP hybrid surround/ceiling speakers
    2 custom 15" sealed FFEC servo subs
    4 custom 15" H-PAS FFEC servo subs
    THX Style Baffle wall

  10. #10
    Forum Regular Woochifer's Avatar
    Join Date
    Dec 2001
    Location
    SF Bay Area
    Posts
    6,890
    Quote Originally Posted by Tarheel_
    any website that will distinguish these higher PCM recorded DVDs? I'm curious and would like to hear a few.

    Thanks everyone !!!
    Your DVD player will identify if the disc was encoded at a 96 kHz sampling rate or using a 24-bit depth. Some music DVDs identify the resolution on the notes or menus, most don't. Pioneer Artists has a few concert DVDs that have 48/20 or 48/24 resolution PCM tracks in addition to the 5.1 option.

    If you want to hear what 96/24 sounds like, Classic Records and Chesky (among others) have produced some excellent high res audio-only DVDs that can play on any DVD player. Chesky's discs require downsampling to 48 kHz for digital output (96 kHz sampling rate only with the analog outs), while Classic's discs are totally open for full resolution digital output.

    Keep in mind though that Classic takes a lot of steps in the mastering process that go beyond just doing the transfer at a higher resolution. So, any improvements that you hear might reflect more than just the higher resolution. Even so, they're very much worth sampling. They're currently transitioning their digital products to 192/24 DVD-A, but those new discs will still include a 96/24 track that can doesn't need a DVD-A player to play back. The link to Classic's website is below. Their Blue Note reissues sound incredible as does the Gershwin compilation and their reissue of Alan Parsons Project "I Robot."

    http://www.classicrecords.com

  11. #11
    AR Newbie
    Join Date
    Jul 2004
    Posts
    1
    to the order of modulating and demodulating... that is where the term "modem" came from.

    MOdulate DEModulate

  12. #12
    AR Newbie Registered Member
    Join Date
    Aug 2008
    Posts
    1

    Help with LCPM

    Having had a Marantz sr5002 connected to PS3 for some time I've just bought new Sony STRDG820 (needed extra HDMI's for APPLE TV).

    When playing Blu Rays with Tru HD etc or DVDs with DD5.1 the amp display states LCPM and won't switch to display Tru HD, DTS etc.

    Likewise Apple TV HD movie downloads with DD - the amp won't switch to display DD - only LCPM

    PS3 output set to Linear PCM not bitstream if that matters

    Is this a problem or is LPCM the best quality available?

    Confused - anyone help?

    What are best settings for me?

  13. #13
    Da Dragonball Kid L.J.'s Avatar
    Join Date
    Aug 2005
    Location
    Posted in da cut
    Posts
    3,597
    Quote Originally Posted by davey71
    Having had a Marantz sr5002 connected to PS3 for some time I've just bought new Sony STRDG820 (needed extra HDMI's for APPLE TV).

    When playing Blu Rays with Tru HD etc or DVDs with DD5.1 the amp display states LCPM and won't switch to display Tru HD, DTS etc.

    Likewise Apple TV HD movie downloads with DD - the amp won't switch to display DD - only LCPM

    PS3 output set to Linear PCM not bitstream if that matters

    Is this a problem or is LPCM the best quality available?

    Confused - anyone help?

    What are best settings for me?
    I'm not familiar with that Sony but as long as it's HDMI 1.1 or up your OK. The PS3 cannot bitstream. It decodes the HD audio and sends it as PCM to your AVR. Linear PCM is the correct settings to have on your PS3. So yes, your AVR should display LPCM while using the PS3. Hit display on your PS3 controller(you can hit triangle then display or select) and this will pull up a screen that tells you exactly what the PS3 is outputting.

  14. #14
    Oh where have ye gone RL?
    Join Date
    Apr 2004
    Location
    Out there
    Posts
    6,854
    Atta way ta go L.J.
    Mitsubishi 57732 DLP TV
    Yamaha RX-V3800 Receiver
    Emotiva LPA-1 amp
    PS3 w/Blu-ray
    Oppo DV-980 DVD player
    BFD DSP1124P
    Harmony 880 Remote
    B & W Matrix 804 mains
    B & W Matrix HTM center
    B & W 800ASW sub
    B & W P6 surrounds

  15. #15
    ride a jet ski Tarheel_'s Avatar
    Join Date
    Nov 2003
    Location
    North Carolina
    Posts
    656
    wow...talking about dusting the cover off...this thread started back in dec 2003, and i'm still here! Learned so much since those days.

  16. #16
    AR Newbie Registered Member
    Join Date
    Jan 2009
    Posts
    2
    [QUOTE=davey71]Having had a Marantz sr5002 connected to PS3 for some time I've just bought new Sony STRDG820 (needed extra HDMI's for APPLE TV).

    When playing Blu Rays with Tru HD etc or DVDs with DD5.1 the amp display states LCPM and won't switch to display Tru HD, DTS etc.

    Hey did anyone ever answer this question for you cause i have an STRDG920 and i'm having the same issue? Is it normal? or is my BD player not decoding these signals?

  17. #17
    Forum Regular Woochifer's Avatar
    Join Date
    Dec 2001
    Location
    SF Bay Area
    Posts
    6,890
    [QUOTE=jimio11]
    Quote Originally Posted by davey71
    Having had a Marantz sr5002 connected to PS3 for some time I've just bought new Sony STRDG820 (needed extra HDMI's for APPLE TV).

    When playing Blu Rays with Tru HD etc or DVDs with DD5.1 the amp display states LCPM and won't switch to display Tru HD, DTS etc.

    Hey did anyone ever answer this question for you cause i have an STRDG920 and i'm having the same issue? Is it normal? or is my BD player not decoding these signals?
    Man, talk about digging into the archives! Tarheel? Monstrous Mike? Those names haven't crossed these paths in quite a while!

    Anyway, the simple answer is that the PS3 does not have any internal decoding for Dolby TrueHD and DTS-HD. The PS3 transcodes the audio signals for those formats to PCM and outputs it digitally via HDMI. There should be no difference in the audio quality since all three formats are lossless, with PCM being an uncompressed audio format and the more widely supported format out of the three.
    Wooch's Home Theater 2.0 (Pics)
    Panasonic VIERA TH-C50FD18 50" 1080p
    Paradigm Reference Studio 40, CC, and 20 v.2
    Adire Audio Rava (EQ: Behringer Feedback Destroyer DSP1124)
    Yamaha RX-V800
    Dual CS5000 (Ortofon OM30 Super)
    Denon DVD-758 (DVD-1940ci)
    Sony Playstation 3 (MediaLink OS X Server)
    Sony ES SCD-C2000ES
    JVC HR-S3912U
    Directv HR22
    Oppo Digital HM-31
    Logitech Harmony 650
    iPad 3


    The Neverending DVD/BD Collection

    Subwoofer Setup and Parametric EQ Results *Dead Link*

  18. #18
    AR Newbie Registered Member
    Join Date
    Jan 2009
    Posts
    2
    THANKS. I got the same answer from sony but i thought the guy was BSing me so i could go away

  19. #19
    AR Newbie Registered Member
    Join Date
    Jan 2009
    Posts
    1

    Help!

    Have old Yamaha RX- V 1300 and Apple TV....using component cables from Yamaha to Panny as there is only one HDMI and that is from Cable Box...using optical cable from Apple TV to the YAMAHA under CDR...

    It always reads PCM and when I have it in "stereo" mode rather than DTS, Prologic etc, I get No sound whatsoever.

    There are only 2 settings on Audio out for Apple TV...Dolby Digital "On" or "Off"...no stereo sound with either....i am forced to sit in some neo concert hall

    Please help my music sound reasonable again

    Thanks

  20. #20
    Forum Regular pixelthis's Avatar
    Join Date
    Apr 2007
    Location
    tuscaloosa
    Posts
    5,628

    Cool

    Quote Originally Posted by recoveryone
    Thx Woochifer. You hit the nail on the head
    When you use a digital input you are limited by your receivers DACS(you'rs appear quite good)
    But the best way to listen to LPCM is through the multichannel out on your player.
    The player handles the decoding, etc.
    Casino royal is LPCM, you can tell by looking at the box.
    USED to see quite a few titles with LPCM , but lately its been more and more DTS MASTER, and DOLBY TRUE HD.
    I like LPCM best.
    LG 42", integra 6.9, B&W 602s2, CC6 center, dm305rears, b&w
    sub asw2500
    Panny DVDA player
    sharp Aquos BLU player
    pronto remote, technics antique direct drive TT
    Samsung SACD/DVDA player
    emotiva upa-2 two channel amp

  21. #21
    AR Newbie Registered Member
    Join Date
    Jan 2010
    Posts
    2
    OK, so is it ithe case then that if I'm playing a disc with a TrueHD or DTSHD soundtrack, and the amp is displaying Linear PCM, that the player is converting the signal to PCM before it reaches the amp?

  22. #22
    Retro Modernist 02audionoob's Avatar
    Join Date
    Jun 2008
    Location
    Dallas, TX
    Posts
    2,946
    Quote Originally Posted by Nocturno
    OK, so is it ithe case then that if I'm playing a disc with a TrueHD or DTSHD soundtrack, and the amp is displaying Linear PCM, that the player is converting the signal to PCM before it reaches the amp?
    Wouldn't this just be a case where your movie has a choice of two audio programs and its default is apparently the PCM program? You could go to the movie's menu and change the audio program from 2-channel PCM to the multi-channel choice.

  23. #23
    AR Newbie Registered Member
    Join Date
    Jan 2010
    Posts
    2
    I've never seen that as a choice on a disc, just the usual DD, DTS, True HD, DTS-HD etc.

  24. #24
    Retro Modernist 02audionoob's Avatar
    Join Date
    Jun 2008
    Location
    Dallas, TX
    Posts
    2,946
    It seems like most of my concert videos have a 2-channel audio program and a multi-channel program...including the ones with TrueHD and DTS-HD.

  25. #25
    M.P.S.E /AES/SMPTE member Sir Terrence the Terrible's Avatar
    Join Date
    Jul 2002
    Posts
    6,818
    Quote Originally Posted by 02audionoob
    It seems like most of my concert videos have a 2-channel audio program and a multi-channel program...including the ones with TrueHD and DTS-HD.
    This ensures backwards compatibility with most any receiver. This thread is dusty old, The Monstrous Man? I haven't seen him around here since the great die off of 1999-2004.
    Sir Terrence

    Titan Reference 3D 1080p projector
    200" SI Black Diamond II screen
    Oppo BDP-103D
    Datastat RS20I audio/video processor 12.4 audio setup
    9 Onkyo M-5099 power amp
    9 Onkyo M-510 power amp
    9 Onkyo M-508 power amp
    6 custom CAL amps for subs
    3 custom 3 way horn DSP hybrid monitors
    18 custom 3 way horn DSP hybrid surround/ceiling speakers
    2 custom 15" sealed FFEC servo subs
    4 custom 15" H-PAS FFEC servo subs
    THX Style Baffle wall

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Tomb Raider II -- poor audio IMO
    By Keith from Canada in forum Favorite Films
    Replies: 11
    Last Post: 12-21-2003, 06:12 AM
  2. X2 -- now that's an audio track!
    By Keith from Canada in forum Favorite Films
    Replies: 2
    Last Post: 12-11-2003, 04:18 AM
  3. What, No Tube Audio Forum?!!!
    By Mwalsdor_cscc_edu in forum General Audio
    Replies: 14
    Last Post: 11-24-2003, 10:09 AM
  4. Testing the digital audio output
    By mpm32 in forum Home Theater/Video
    Replies: 4
    Last Post: 11-20-2003, 08:59 AM
  5. Audio tron or Creative Wireless Music??
    By twwesn in forum Digital Domain & Computer Audio
    Replies: 0
    Last Post: 11-16-2003, 09:02 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Latest AudioReview Articles

Hot Deals

Latest News

AudioReview on Facebook