Blu Ray Audio

1520 Views 4 Replies 3 Participants Last post by D_B_0673, Aug 2, 2011

D_B_0673

Discussion Starter · Aug 2, 2011

I am new to BluRay Audio, just purchased a receiver that will handle it. Right now I am outputting PCM from the BluRay Player. I see on the info screen (not the display on the receiver) that I am actually outputting DTS/MA with Lord of the Rings. It sounded great on a quick listen.

But on some other disks , Blood Diamond, the disks themselves said only Dolby Digital on the package. It did not seem all that different and I wonder if it was not a HighDef Dolby enconde.

Do all blurays have a High Def Audio or do some just have a legacy Dolby

What would it say if it was a high def dolby audio and what bit rate should I see

Thanks

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mchalebk

· #2 · Aug 2, 2011

The majority of BDs released today have either a Dolby or DTS lossless track. However, many older BDs have PCM tracks and a fair amount have lossy Dolby or DTS soundtracks.

You shouldn't be able to tell any difference between PCM and the other lossless tracks. You may or may not be able to tell the difference between the lossless tracks and the lossy tracks.

It's worth pointing out that Blu-ray can use a much higher bitrate for their lossy tracks, so they usually sound better than DVD (and may sound as good as lossless tracks; this is a controversial topic). It's also worth pointing out that many BDs do not default to the lossless tracks, so you might want to swap between the various tracks and see what's available (or go to the audio setup menu).

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D_B_0673

Discussion Starter · #3 · Aug 2, 2011

Quote:
Originally Posted by mchalebk /forum/post/20770782

The majority of BDs released today have either a Dolby or DTS lossless track. However, many older BDs have PCM tracks and a fair amount have lossy Dolby or DTS soundtracks.

You shouldn't be able to tell any difference between PCM and the other lossless tracks. You may or may not be able to tell the difference between the lossless tracks and the lossy tracks.

It's worth pointing out that Blu-ray can use a much higher bitrate for their lossy tracks, so they usually sound better than DVD (and may sound as good as lossless tracks; this is a controversial topic). It's also worth pointing out that many BDs do not default to the lossless tracks, so you might want to swap between the various tracks and see what's available (or go to the audio setup menu).

Thanks

Save

nick_danger

· #4 · Aug 2, 2011

Quote:
Originally Posted by D_B_0673 /forum/post/20770591

I am new to BluRay Audio, just purchased a receiver that will handle it. Right now I am outputting PCM from the BluRay Player. I see on the info screen (not the display on the receiver) that I am actually outputting DTS/MA with Lord of the Rings. It sounded great on a quick listen.

But on some other disks , Blood Diamond, the disks themselves said only Dolby Digital on the package. It did not seem all that different and I wonder if it was not a HighDef Dolby enconde.

Do all blurays have a High Def Audio or do some just have a legacy Dolby

What would it say if it was a high def dolby audio and what bit rate should I see

Thanks

Sometimes players default to Dolby Digital if it is available. Blood Diamond comes with uncompressed PCM and DD. You have to manually change your Blu-ray player to use the PCM track instead of the DD track. Look for a button on your Blu-ray remote marked "audio" and press it until it outputs the correct audio stream.

There are THREE lossless audio types: DTS HD Master Audio, Dolby TrueHD, and uncompressed PCM.

There is also Dolby Digital Plus, which is essentially a high bit rate, but lossy, codec. This is not used very often, but some early HD discs used this.

Then there's basic DTS and Dolby Digital from the DVD era. If your receiver doesn't support the new HD audio, most Blu-ray players will down-sample that audio to a 1500kbps DTS stream.

This is the most basic answer I can give.

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D_B_0673

Discussion Starter · #5 · Aug 2, 2011

Quote:
Originally Posted by nick_danger /forum/post/20770800

Sometimes players default to Dolby Digital if it is available. Blood Diamond comes with uncompressed PCM and DD. You have to manually change your Blu-ray player to use the PCM track instead of the DD track. Look for a button on your Blu-ray remote marked "audio" and press it until it outputs the correct audio stream.

There are THREE lossless audio types: DTS HD Master Audio, Dolby TrueHD, and uncompressed PCM.

There is also Dolby Digital Plus, which is essentially a high bit rate, but lossy, codec. This is not used very often, but some early HD discs used this.

Then there's basic DTS and Dolby Digital from the DVD era. If your receiver doesn't support the new HD audio, most Blu-ray players will down-sample that audio to a 1500kbps DTS stream.

This is the most basic answer I can give.

thanks again

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