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音頻處理matlab代碼,配合mp3.pdf中介紹使用,共有6個代碼,其二
代碼片段和文件信息
function?[N_bitsSNR]?=?MPEG1_bit_allocation1(SMR?bit_rate)
%?|function?[N_bitsSNR]?=?MPEG1_bit_allocation(SMR?bit_rate)|
%?Implements?a?simplified?bit?allocation?greedy?algorithm.
%?|SMR|?is?the?signal-to-mask?ratios?in?each?sub-band
%?as?defined?by?the?MPEG1?psycho-acoustic?model.?
%?|bit_rate|?is?in?kbits/s.
%?|N_bits|?is?the?number?is?bits?in?each?sub_band.
%?|SNR|?is?the?maximum?SNR?in?each?sub-band?after?quantization?i.e.?the
%?SNR?assuming?each?sub-band?contains?a?full-range?sinusoid.
%?NB:?N_bits?and?SNR?are?set?to?zero?for?sub-bands?28?to?32.
%?
%?Copyright?N.?Moreau?ENST?Paris?19/03/02
%?Modified?by?Thierry?Dutoit?FPMs?Mons?03/05/07
?
Fe=44100;
%?Imposing?low?SMR?for?bands?28-32?to?ensure?0?bits.
SMR?=?[SMR(1:27)?ones(15)*-100];?
%?Assuming?6?bits?for?each?scale?factor?and?4?bits?for?each?number?of
%?allocated?
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