public void dec_gain( int index, /* input : quantizer index */ float code[], /* input : fixed code book vector */ int l_subfr, /* input : subframe size */ int bfi, /* input : bad frame indicator good = 0 */ FloatPointer gain_pit, /* output: quantized acb gain */ FloatPointer gain_code /* output: quantized fcb gain */) { int index1, index2; float g_code; FloatPointer gcode0 = new FloatPointer(); /*----------------- Test erasure ---------------*/ if (bfi != 0) { gain_pit.value *= (float) 0.9; if (gain_pit.value > (float) 0.9) gain_pit.value = (float) 0.9; gain_code.value *= (float) 0.98; /*----------------------------------------------* * update table of past quantized energies * * (frame erasure) * *----------------------------------------------*/ GainPred.gain_update_erasure(past_qua_en); return; } /*-------------- Decode pitch gain ---------------*/ index1 = TabLD8k.imap1[index / LD8KConstants.NCODE2]; index2 = TabLD8k.imap2[index % LD8KConstants.NCODE2]; gain_pit.value = TabLD8k.gbk1[index1][0] + TabLD8k.gbk2[index2][0]; /*-------------- Decode codebook gain ---------------*/ /*---------------------------------------------------* *- energy due to innovation -* *- predicted energy -* *- predicted codebook gain => gcode0[exp_gcode0] -* *---------------------------------------------------*/ GainPred.gain_predict(past_qua_en, code, l_subfr, gcode0); /*-----------------------------------------------------------------* * *gain_code = (gbk1[indice1][1]+gbk2[indice2][1]) * gcode0; * *-----------------------------------------------------------------*/ g_code = TabLD8k.gbk1[index1][1] + TabLD8k.gbk2[index2][1]; gain_code.value = g_code * gcode0.value; /*----------------------------------------------* * update table of past quantized energies * *----------------------------------------------*/ GainPred.gain_update(past_qua_en, g_code); return; }