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Topic: Mpeg2 layer1 encoding (Read 12160 times) previous topic - next topic
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Mpeg2 layer1 encoding

Reply #25 –
Mainconcept MPEG encoder has it, but it doesn't allow for frequency lower than 32kHz
TAPE LOADING ERROR

Mpeg2 layer1 encoding

Reply #26 –
The main difference between dual channel encodings and simple stereo encodings is how a player does the play back. With bilingual language encodings one may want left channel only (language 1) or right channel only (language 2). If you only want to test your own decoder, you may let your decoder handle simple stereo encodings as dual channel encodings (under test conditions). Another thing you could do is, take a simple stereo encoded stream and patch at every frame the stereo mode bits from simple stereo to dual channel.

Mpeg2 layer1 encoding

Reply #27 –
As robert wrote, as long as you don't use joint stereo mode, dual channel is the same as stereo encoding, except for the bitstream information. So even with this, you should be able to test your decoder (force it to dual channel mode). Or spend some work on the encoder, homepage was blocked for me, so can't say if there is sourcecode.
If so, shouldn't be to hard to adapt the bitstream information according to the list sebastian posted above. I guess it is up to you now, since most probably no one else has the need for an MPEG2 L1 dual channel encoder. DCC is long dead, and yes, I knew it, and even had a recorder...:-)

Mpeg2 layer1 encoding

Reply #28 –
note: DCC was using MPEG1

Mpeg2 layer1 encoding

Reply #29 –
Wikipedia states something different:
Quote
An audio compression codec, called PASC (Precision Adaptive Sub-band Coding), which is a 4:1 scheme similar to MPEG-1, was used to supply sufficient playing time
Veni Vidi Vorbis.
 

Mpeg2 layer1 encoding

Reply #30 –
Quote from: HbG on
Wikipedia states something different:
Quote
An audio compression codec, called PASC (Precision Adaptive Sub-band Coding), which is a 4:1 scheme similar to MPEG-1, was used to supply sufficient playing time



That's probably because DCC is older than MPEG, PASC was what Philips' submitted for MPEG-1 audio.