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/external/speex/libspeex/

preprocess.c

236 float *loudness_weight; /**< Perceptual loudness curve */ member in struct:SpeexPreprocessState_ 505 st->loudness_weight = (float*)speex_alloc(N*sizeof(float)); 509 /*st->loudness_weight[i] = .5f*(1.f/(1.f+ff/8000.f))+1.f*exp(-.5f*(ff-3800.f)*(ff-3800.f)/9e5f);*/ 510 st->loudness_weight[i] = .35f-.35f*ff/16000.f+.73f*exp(-.5f*(ff-3800)*(ff-3800)/9e5f); 511 if (st->loudness_weight[i]<.01f) 512 st->loudness_weight[i]=.01f; 513 st->loudness_weight[i] *= st->loudness_weight[i]; 548 speex_free(st->loudness_weight); 579 loudness += 2.f*N*st->ps[i]* st->loudness_weight[i]     [all...]

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