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< Esato Forum Index > Sony Ericsson / Sony > Themes, ringtones, screensavers, games, video clips > mp3: dual mono vs stero ;-) Bookmark topic

dual mono is just mono but in 2 channels storing the same information which IMO is a waste of space and processing power. It will have the same quality as an ordinary mono but will occupy twice the space.
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Posted: 2005-03-15 03:59:06
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I'm not quite sure what you're asking...

Are you asking if it's better to use 2 identical channels (mono signal x2)... or encode using stereo (2 separate channels/data signals)... or encode using joint stereo (1 data signal with 2 partial channels)?

2 identical channels (or dual mono) would be a bit pointless, but some people can tell the difference between a mono signal played through 2 speakers/headphones... and 2 identical mono signals each played through a separate speaker/headphone.

2 separate signals (stereo) would be the best...but occupies 2x the bandwidth of a mono file, and about 50% more than a joint stereo file.

Joint stereo, is a unique compression scheme that is essentially a mono file... then the compressor additionally stores only the sounds that are different on the L/R channels... so you get a much smaller file than a Stereo file... but with the same effect.

Of course, the higher the bitrate... the better. 192kbps should be the bare minimum encoding rate for decent mp3s.
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Posted: 2005-03-15 04:01:58
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@blackspot: dual mono doesn't mean 2xsame channel. It means separate encoding for L&R channel- that is in fact real stereo sound- while joint stereo is sort of improvisation of stereo sound. dual mono definitely sounds better than joint stereo or 'stereo' in nero, but only if you use higher bit rate-say 192 and higher. At lower bit rates it's better to use joint stereo.

[ This Message was edited by: Blayv on 2005-03-15 06:24 ]
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Posted: 2005-03-15 07:11:57
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AFAIK, Dual mono is just mono which comes from adding the original L & R channels then distributing the result to the left and right -- it will have the same sound as an ordinary mono. It will probably sound louder but definitely not better compared to true stereo or joint stereo.

Stereo or Joint Stereo is just a method of distributing the bitrate when encoding mp3 files between the two channels, for example, at 128Kbps for a certain sample, in Stereo mode, the bitrate will be evenly distributed 64-64 between L & R while in Joint Stereo the signal is processed such that an optimum distribution of the bitrate will be achieved between the L & R channels. This way if one of the channels contains very few sound information it will be given lesser bandwidth while maximizing the other channel. This makes the quality of the channel with more data to significantly increase. This is effective for sounds containing totally different signals between the L & R channels and specially useful on lower bitrates.
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Posted: 2005-03-15 08:43:51
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@blackspot

I think what you're describing there is any VBR encoding, whether it uses joint stereo or not. All VBR will give extra bitrate to more complex signals. Joint stereo, as I believe someone else pointed out, looks for information that is the same on both L and R channels (essentially information that is mono anyway) and encodes it once instead of twice like normal stereo.
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Posted: 2005-03-15 12:29:40
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VBR is totally different although the idea of optimizing the bitrate is almost the same as in joint-stereo. To sumarize, VBR distributes the bitrate differently all throught the different blocks/segment of an entire file, that's why you have a minimum, average, and maximum bitrate setting. Joint-stereo merely distributes the bitrate to the different channels in every block and will work in CBR or VBR.

I suggest that if you want to argue about these technical stuff - you should read more detailed information about it, and not just talk about what you hear or what you think it is. I have so I'm sure I'm right.
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Posted: 2005-03-16 02:43:16
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It's attitudes like yours that make people like me reluctant to post on forums at all. If you have to be an expert to voice an opinion around here, then most of us really shouldn't bother, should we?
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Posted: 2005-03-16 13:14:04
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@AlfBaxter, what's wrong about suggesting somebody to read detailed information about technical stuff? You should read your comments and put yourself in my shoes, then let me know what you think about your attitude. I think you're over reacting. I'm not pretending to be an expert, I'm merely saying what I know and if you read my posts I never tell anybody they're wrong because of some unfounded information that I gathered.

I enjoy learning new things and I don't mind arguments at all as long as they're based on real facts.
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Posted: 2005-03-17 03:10:15
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