Lines Matching refs:dB
117 /* copy curves into working space, replicate the 50dB curve to 30
118 and 40, replicate the 100dB curve to 110 */
134 /* normalize curves so the driving amplitude is 0dB */
146 will be; 0dB SL moves every time the user twiddles the volume
149 can be in (we assume) a range of ...+100dB] SL. However, sounds
150 20dB down will be in a range ...+80], 40dB down is from ...+60],
386 /* octave/(8*eighth_octave_lines) x scale and dB y scale */
739 int dB=logmask[i]+.5;
740 if(dB>=NOISE_COMPAND_LEVELS)dB=NOISE_COMPAND_LEVELS-1;
741 if(dB<0)dB=0;
742 logmask[i]= work[i]+p->vi->noisecompand[dB];
801 coeffi = -17.2; /* coeffi is a -17.2dB threshold */
802 val = val - logmdct[i]; /* val == mdct line value relative to floor in dB */
805 /* mdct value is > -17.2 dB below floor */
809 -0.00 dB boost if mdct value is -17.2dB (relative to floor)
810 -0.77 dB boost if mdct value is 0dB (relative to floor)
811 -1.64 dB boost if mdct value is +17.2dB (relative to floor)
816 /* mdct value is <= -17.2 dB below floor */
820 +0.00 dB atten if mdct value is -17.2dB (relative to floor)
821 +0.45 dB atten if mdct value is -34.4dB (relative to floor)
