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PC games in dolby digital?

post #1 of 6
Thread Starter 
Just hooked up my new tv to my computer with an HDMI connection through my gpu. It works flawless and even sends audio perfectly to the tv and my receiver.

Now when I play a movie for a test the receiver picks up dolby digital sound fine and plays perfect.

Any game I play only sends Pro logic to the receiver.

Now Im thinking that none of these games have dolby support, but Im wondring if there is still a way to have the sound output still be 5.1 DD to the tv.

Pro logic is fine and all and still gives me a nice loud sound system to play games, but having DD is always a plug.
post #2 of 6
Pro Logic is a technology by Dolby. It takes 2 stereo Dolby Digital Encoded Audio channels and decodes it into 6 separate channels (5.1) so you are getting 5.1 DD sound.
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post #3 of 6
Hi,
The problem you have is that you do'nt have a dolby digital live card to output 5.1 in games, you can have 5.1 in films as the player you use will send the ac3/5.1 as a 2 channel passthrough and then your stereo/amp decodes it back to 5.1.

However this does'nt work for games so the cheapest route you can go is to get this, this is what i've been using for over a year and i have had zero problems and play ALL my games in true 5.1.
Trust sc-7600 dolby digital live
This was the cheapest dolby digital live card around at the time i brought it, there may be others now but i'll leave that upto you to research, just remember if it is'nt dolby digital live then its no good!

Only way round this is to use the 5? stereo jacks for 5.1 that are usually on the mobo connections.

A dolby digital card is of no use to you, you need a DOLBY DIGITAL LIVE sound card.

There are 2 types of dolby digital live, there is the type that the soundcard puts onto the cpu for decoding and then is the type that i have which has a hardware based dolby digital live chip on the soundcard.
Creative have a download for DDL i believe but it puts it on the cpu which takes up resources and it maybe has lag, i dno as its been over a year now since the last time i researched.

I take it your using toslink/spdif/optical?
Edited by OcSlave - 8/4/11 at 7:35am
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post #4 of 6
Quote:
Originally Posted by Xanoku;14460321 
Pro Logic is a technology by Dolby. It takes 2 stereo Dolby Digital Encoded Audio channels and decodes it into 6 separate channels (5.1) so you are getting 5.1 DD sound.

Dolby pro logic takes 2/4 channels and turns them into 5.1 , this is'nt a very good 5.1 and it's allso not dolby digital, the surround sound speakers are mono with the front l/r speakers but with a slight shift to create a virtual type of surround..
Dolby digital has the full audio for 5.1 which gives true to life surround sound where as pro logic just adds more channels to 2/4 channels which creates the illusion of 5.1 using tricks.
Quote:
1. Dolby Pro Logic is the simplest, cheapest format. It has 4 channels that are compressed into two analog channels, so you can record it on your stereo VCR and it can also broadcasted even over analog radio or cable TV. Another advantage – Dolby Pro Logic can be easily downconverted from a Dolby Digital signal.

These are 2 discrete and 2 matrixed channels:
2 discrete, full-bandwidth channels (left front, right front),
1 matrixed full-bandwidth center channel,
1 matrixed, limited-width channel that goes to 2 surround speakers.

The Dolby Pro Logic encoder takes 4 channels (L, R, C, S) and creates two output channels (Lt, Rt). L goes to Lt and R goes to Rt without modifications, C, after a 3dB level reduction, gets divided equally between Lt and Rt. The bandwidth of S gets limited to 100Hz - 7 kHz range, it is encoded with a form of Dolby B noise reduction. After that it gets divided between Lt and Rt but with a +90 and -90 degree phase shifts.

During the playback, the surround is extracted by analyzing the difference between Lt and Rt.

Disadvantages are: both surround speakers produce the same sound from the same channel (mono sound) and are limited in bandwidth. Additionally, there is no discrete subwoofer channel specified in the standard, so subwoofer channel can extracted from other channels rather than specified explicitly.

Sources for Dolby Pro Logic include TV shows and movies, videotapes, other analog sources and downconverted signal from Dolby Digital (DVD for example).

2. Dolby Digital is a 6-channel format, referred to as “5.1-channel”. All 6 channels are discrete, 5 channels are full-bandwidth, “.1” refers to subwoofer, which supplies Low Frequency Effects (LFE).

To compress data with low loss in the sound quality, audio coding, known as "perceptual coding" is used. Dolby Digital uses a third generation audio coding algorithm (AC-3).

The channels are: front left, front right, center, surround left, surround right and subwoofer.

Advantages over Dolby Pro Logic include the fact that all channels are digital, discrete and 5 of them are full-bandwidth. Additionally, the surround speakers use separate left and right channels (stereo).

Sources include all DVDs, some DBS broadcasts and some HDTV programs.

Edited by OcSlave - 8/4/11 at 7:50am
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by OcSlave;14460386 
Hi,
The problem you have is that you do'nt have a dolby digital live card to output 5.1 in games, you can have 5.1 in films as the player you use will send the ac3/5.1 as a 2 channel passthrough and then your stereo/amp decodes it back to 5.1.

However this does'nt work for games so the cheapest route you can go is to get this, this is what i've been using for over a year and i have had zero problems and play ALL my games in true 5.1.
Trust sc-7600 dolby digital live
This was the cheapest dolby digital live card around at the time i brought it, there may be others now but i'll leave that upto you to research, just remember if it is'nt dolby digital live then its no good!

Only way round this is to use the 5? stereo jacks for 5.1 that are usually on the mobo connections.

A dolby digital card is of no use to you, you need a DOLBY DIGITAL LIVE sound card.

There are 2 types of dolby digital live, there is the type that the soundcard puts onto the cpu for decoding and then is the type that i have which has a hardware based dolby digital live chip on the soundcard.
Creative have a download for DDL i believe but it puts it on the cpu which takes up resources and it maybe has lag, i dno as its been over a year now since the last time i researched.

I take it your using toslink/spdif/optical?

Its HDMI from card to the tv then toslink from the TV to the receiver.
post #6 of 6
Quote:
Originally Posted by Djnardu;14468821 
Its HDMI from card to the tv then toslink from the TV to the receiver.

That's ok, but you will need a soundcard with DOLBY DIGITAL LIVE for 5.1 in games if you want to use toslink, there's no other possible way around this, toslink only has 5.1 in games with DDL.

As long as your tv has dolby digital passthrough you can use hdmi to tv then toslink to reciever, if it does'nt have dolby passthrough then it will still output 2 channel so you would need to go direct from your pc to the reciever with the optical cable.
i know my tv only passes through 2 channels even though i can send it 5.1 so i go from soundcard to stereo.

Again i'll just piont out that you can't do what you want without a dolby digital live card, do'nt be fooled by dolby digital cards like i was, i basicly brought 2 sound cards as teh first was'nt a ddl.
Edited by OcSlave - 8/5/11 at 6:52am
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