mp3 compression but to joint-stereo??? ;( -Sound Forge - PC

Subject:mp3 compression but to joint-stereo??? ;( Posted by: speedstar Date:2/18/2003 3:05:20 PM I was hope, that 6 edition can save as mp3 in real stereo, not joint-stereo... where can i find fraunkof & thomson latest encoder with stereo support? or maybe its possible to do with sf 5 or 6? help me ;(
Subject:RE: mp3 compression but to joint-stereo??? ;( Reply by: Geoff_Wood Date:2/18/2003 9:22:54 PM WTF is joint-stereo ? Reminds me of the old days, listening to Dark Side .... A stereo mp3 is a stereo MP3 as far as I know. geoff
Subject:RE: mp3 compression but to joint-stereo??? ;( Reply by: Chienworks Date:2/19/2003 7:44:47 AM I just tried this experiment ... i created a new stereo file in SoundForge 6.0d, pasted a mono speech into the left channel and pasted a mono instrumental song into the right channel, then saved it as a 160Kbps MP3 file. I then opened this MP3 file in SoundForge. There is no apparent bleed/crosstalk from one channel to the other. It appears that the two channels are encoded completely separately from each other. Is this what you needed to know? I can eMail you the file if you want to see it for yourself.
Subject:RE: mp3 compression but to joint-stereo??? ;( Reply by: speedstar Date:2/19/2003 9:04:57 AM Fraunkofer & Thomson mp3 encoder have stereo mode, why SF dont have? Q : What's the difference between the various stereo modes? A : It's important to understand the difference between Stereo and Joint Stereo. 'Joint Stereo' modes take advantage of the similarities between the L+R channels. This allows more bits to be used in other areas and in many cases this can give an overall gain in encoding quality. Almost all encoders use joint stereo when encoding at 128 kbits. Joint stereo has 2 submodes called IS and MS. 'Joint Stereo IS' destroys phase information and shouldnt be used for high-quality encoding. 'Joint Stereo MS' means Middle/Side and is OK for use in most encoding. However, for some audio, Joint Stereo MS may create a 'flanging' or 'swishing' effect. In these cases it's better to use 'Stereo mode'. This mode creates 2 independent channels for both left and right. When stereo mode is used, you should also use a higher bitrate (160 or 192 kbits) - Stereo mode will allocate about half of this bitrate for each channel. In summary, for most audio, Joint Stereo MS at 128 or 160 kbits should be fine. If your audio is especially 'wide' and creates flange you should use 'Stereo' mode. You can change these modes in the Radium codec control panel.

Subject:mp3 compression but to joint-stereo??? ;(

Posted by: speedstar

Date:2/18/2003 3:05:20 PM

I was hope, that 6 edition can save as mp3 in real stereo, not joint-stereo... where can i find fraunkof & thomson latest encoder with stereo support? or maybe its possible to do with sf 5 or 6? help me ;(

Subject:RE: mp3 compression but to joint-stereo??? ;(

Reply by: Geoff_Wood

Date:2/18/2003 9:22:54 PM

WTF is joint-stereo ? Reminds me of the old days, listening to Dark Side ....

A stereo mp3 is a stereo MP3 as far as I know.

geoff

Subject:RE: mp3 compression but to joint-stereo??? ;(

Reply by: Chienworks

Date:2/19/2003 7:44:47 AM

I just tried this experiment ... i created a new stereo file in SoundForge 6.0d, pasted a mono speech into the left channel and pasted a mono instrumental song into the right channel, then saved it as a 160Kbps MP3 file. I then opened this MP3 file in SoundForge. There is no apparent bleed/crosstalk from one channel to the other. It appears that the two channels are encoded completely separately from each other. Is this what you needed to know? I can eMail you the file if you want to see it for yourself.

Subject:RE: mp3 compression but to joint-stereo??? ;(

Reply by: speedstar

Date:2/19/2003 9:04:57 AM

Fraunkofer & Thomson mp3 encoder have stereo mode, why SF dont have?

Q : What's the difference between the various stereo modes?
A : It's important to understand the difference between Stereo and Joint Stereo.
'Joint Stereo' modes take advantage of the similarities between the L+R
channels. This allows more bits to be used in other areas and in many cases
this can give an overall gain in encoding quality. Almost all encoders use
joint stereo when encoding at 128 kbits.

Joint stereo has 2 submodes called IS and MS. 'Joint Stereo IS' destroys
phase information and shouldnt be used for high-quality encoding.
'Joint Stereo MS' means Middle/Side and is OK for use in most encoding.

However, for some audio, Joint Stereo MS may create a 'flanging' or
'swishing' effect. In these cases it's better to use 'Stereo mode'. This
mode creates 2 independent channels for both left and right. When stereo
mode is used, you should also use a higher bitrate (160 or 192 kbits) -
Stereo mode will allocate about half of this bitrate for each channel.

In summary, for most audio, Joint Stereo MS at 128 or 160 kbits should be
fine. If your audio is especially 'wide' and creates flange you should use
'Stereo' mode. You can change these modes in the Radium codec control panel.