Hi,all,
I have some questions to discuss with you:
1)i used some sine wave whose frequencies are 997,1k,etc to encode with
lame mp3 encoder, but i found 997.mp3 is not as good as 1k.mp3. then i use
soundforge to check theirs decoding wav, and i found some errors in decoding
997.wav, why?
2)i have tried to encode without Psymodel, and i tested the result using
a sine wave, it sounds well and it's SNR is approx equal to the old. And i
also tried to encode music, they sounds well too, so i want to do fixed
point encoding without Psymodel, but whether does it do well for all music?
3)And,you know that the results of subband systhesis are also greater
than 2^31or less than -2^31, and almost all data of the table enwindow[] is
divided by 2.384e-06, so, to lessen the results, i change 2.384e-06 to
2.384e-04 first, and multipled win[4][36] with 1e2, the results can be
represent with int! But the precision is not enough, and the SNR of final
mp3 encoding with this method isn't as good as old. Before, i calc subband
systhesis using exponent+mantissa, but it runs slowly. How to maintain
precision and the results don't exceed int? What about your opinion?
best regards
anne
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