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Discussion Starter · #1 ·
This is a newbie question. I appreciate your help.


I'm not able to get DD 5.1 audio from the TV channels. Even though the TV show is broadcasted in 5.1 audio, my receiver shows 2.0 on its display screen.


I'm wondering whether I'm doing something wrong or whether this is not possible to begin with.


I have Time Warner broadcast basic cable, but I don't have a cable box. My setup is simple. Cable from the wall goes to the TV, and digital audio cord from TV goes to the receiver. My TV is Sony V5100 and receiver is Sony CT500. When I connect a blu-ray blayer to one of the TV's HDMI ports, the receiver shows 5.1 on its display. So, I'm guessing that the TV is able to pass 5.1 signal and receiver is capable of receiving 5.1 signal.


Is there something wrong in my setup? or is this because Time Warner filters DD 5.1 audio in unencrypted clear channels.
 

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It's probably just because DD 2.0 is all they are passing on that channel.
 

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Discussion Starter · #3 ·
For example on Friday, there was a prime time show on CBS and CBS displayed on the TV screen that this show was being broadcasted in DD 5.1, but my receiver displayed 2.0 on its screen
 

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the QAM tuner in your TV receives can receive digital tv unscrambled on the cable. Many cable companies choose to transmit the audio in 2 channel stereo on these unscrambled channels. How do you have the audio output from your TV connected to the a/v receiver.


The digital set top boxes tune the cable companies digital channels which may have the DD 5.1 signals and it's the box that provides the toslink optical or digital audio coax output to feed the signal to your a/v receiver.


If you use the built-in ATSC digital TV tuner for over-the-air TV reception with an antenna, your set will output DD5.1 when it is present on a network HDTV show.
 

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Quote:
Originally Posted by m_vanmeter /forum/post/16929217


the QAM tuner in your TV receives 2channel audio only.

Are you talking about the specific QAM tuner in the OP's TV? The QAM tuner in my set outputs DD 5.1 and this is the first I have heard that some may not.
 

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"BIslander" - you are correct, I have corrected (I hope) my post. QAM does decode the digital audio, if the cable company provides it and you connect the TV digital audio output to the receiver via Toslink optical or digital audio coax, whichever the TV provides. Thanks for catching the mistake.
 

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Discussion Starter · #7 ·
Thanks for your responses. They were helpful.


From what I understand, I guess it is either Time Warner filters DD 5.1 audio in unencrypted clear channels or I might have a problem with my TV's QAM tuner.


Is there anyone who is able to get DD 5.1 sound from Time Warner without a cable box? This would help me determine that the problem is the TV not Time Warner.
 

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Quote:
Originally Posted by deepblueNC /forum/post/16929698


Thanks for your responses. They were helpful.


From what I understand, I guess it is either Time Warner filters DD 5.1 audio in unencrypted clear channels or I might have a problem with my TV's QAM tuner.


Is there anyone who is able to get DD 5.1 sound from Time Warner without a cable box? This would help me determine that the problem is the TV not Time Warner.

I don't have Time Warner, but even with a cable box, I find not much DD 5.1 content unless you're on a premium (extra cost) channel. A fair amount of DD 2.0 out there though.


Unfortunately, I don't have my TV digital output connected to my system to do any testing. The cable box is in that chain.
 

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Quote:
Originally Posted by deepblueNC /forum/post/16929200


For example on Friday, there was a prime time show on CBS and CBS displayed on the TV screen that this show was being broadcasted in DD 5.1, but my receiver displayed 2.0 on its screen

Just to clarify, when you say it shows 2.0, do you mean DD 2.0, or PCM 2.0? If DD 2.0, then that's what is being transmitted. There is no means for a cable box or a TV to convert a DD 5.1 signal into DD 2.0. However, DD 5.1 can be converted to PCM 2.0.
 

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Discussion Starter · #10 ·

Quote:
Originally Posted by Roger Dressler /forum/post/16933085


Just to clarify, when you say it shows 2.0, do you mean DD 2.0, or PCM 2.0? If DD 2.0, then that's what is being transmitted. There is no means for a cable box or a TV to convert a DD 5.1 signal into DD 2.0. However, DD 5.1 can be converted to PCM 2.0.

The display screen on the receiver shows LPCM 2.0, even though some TV shows state that they are in DD 5.1.
 

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Have you checked the TV's setup for the digital/optical audio options? Maybe there's a setting/selection for PCM, bitstream(DD) or both (auto).
 

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First thing to do it check the setting Ratman suggests. If that is set to DD, the likely culprit is that your's and most TVs, will only output DD from their optical ports when that signal is derived from OTA sources. I believe others have said this.


Sorry if this has been gone over already.


edit: m_vanmeter already said this.
 

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Quote:
Originally Posted by Easyaspie /forum/post/16934598


... the likely culprit is that your's and most TVs, will only output DD from their optical ports when that signal is derived from OTA sources.

I humbly disagree. Internal (digital) TV tuners will process DD and output DD from digital cable (QAM) sources via optical/coax audio outputs when available.


I am not aware of any TV that only outputs DD from OTA (8VSB), but not cable (QAM).
 

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Discussion Starter · #14 ·

Quote:
Originally Posted by Ratman /forum/post/16933655


Have you checked the TV's setup for the digital/optical audio options? Maybe there's a setting/selection for PCM, bitstream(DD) or both (auto).

I checked TV's (Sony V5100) audio setup options, I could not find a selection for PCM or bitstream. The TV's manual states that its "optical audio output connects to the optical audio input of a digital audio equipment that is PCM optical compatible." Does this mean that TV can send only PCM?


I know that when I connect my blu-ray player to one the TV's HDMI ports, the TV is able to pass through DD 5.1 audio via optical cord to the receiver.
 

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Yes... I did see that statement when I read your manual earlier.


I find it highly unlikely that a digital audio output would not support Dolby Digital from the internal tuner whether it's OTA or cable. Especially since 1) your TV is top notch and 2) it apparently will "pass-through" DD from an external HDMI source (which IS a feature not typically supported/provided on the majority of TV's.)


Hopefully someone that owns this particular TV can confirm/deny the supported features.


Here's my suggestion:

If you have or can borrow an antenna, connect and scan for OTA channels and see if the AVR detects DD.
 

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Quote:
Originally Posted by Ratman /forum/post/16934814


I humbly disagree. Internal (digital) TV tuners will process DD and output DD from digital cable (QAM) sources via optical/coax audio outputs when available.


I am not aware of any TV that only outputs DD from OTA (8VSB), but not cable (QAM).

I don't disagree, it's just that I've never seen a TV advertised as such. Most of the time you will see a spec for a TV that mentions it's optical output as being able to be connected to a receiver and outputing DD from OTA sources. If they do it from cable too, thats great.



The OP seems to have one of those rare TVs that will also pass DD from connected HDMI sources.


edit: I see his TV says that it will pass DD from "digital" broadcasts, not just OTA.
 

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Discussion Starter · #18 ·
Ratman, thanks for your help. I was thinking about the same thing, testing what happens with OTA. But my concern is that when I scan OTA channels, my settings (deleted channels, channel names, etc.) will be cleared and I have to reprogram everything when I switch back to cable. But again, this is probably the best way to determine the cause of the problem.


I noticed that for specifications of some other Sony TV's e.g., W5100, Z5199, Sony explicitly state that "Connects to the optical audio input of digital audio equipment that is PCM/Dolby Digital compatible." and also 5.1-channel audio out. These are not stated for my TV.


I saw 5.1 channels on my receiver when I connect my blu-ray player to TV and pass the audio to the receiver through optical cord, but I do not recall whether it was Dolby Digital (this may be a stupid sentence). I don't know whether you can have 5.1 channels without Dolby digital. I'll check it this evening whether the Dolby sign was also on.


Given that specifications for other Sony TV models explicitly state 5.1-channel audio out, but my TV's specifications don't makes me suspicious that the problem might be the TV.


Only if there's somebody who has Time Warner cable without the box and getting 5.1-channel audio out, then I know for sure the problem is the TV


Or only if there's somebody who has the same TV but getting 5.1-channel audio over the air, then I know the problem is Time Warner.
 

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Discussion Starter · #20 ·
I tested the TV with OTA and I still could not get DD 5.1 for a tv show that is in DD 5.1. So, the problem is not Time Warner. Sony confirmed that I should be able to get DD 5.1 when the source is TV's tuner, so I'm guessing that the problem is probably the TV's tuner. Sony support asked me call an authorized service and have them check the TV.
 
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