improving bit exactness. (f92c665e) · Commits · SA4 / Audio / IVAS BASOP

lib_com/tcx_ltp_fx.c

+65 −29

Original line number	Diff line number	Diff line
		@@ -611,6 +611,8 @@ static void tcx_ltp_synth_filter32(
		synth[j] = L_sub_sat( synth[j], zir[j] );
		}
		}
		IF ( fade != 0)
		{
		FOR( j = 0; j < length; j++ )
		{
		s = L_deposit_l( 0 );
		@@ -647,6 +649,40 @@ static void tcx_ltp_synth_filter32(
		}
		}
		ELSE
		{
		FOR( j = 0; j < length; j++ )
		{
		s = L_deposit_l( 0 );
		s2 = L_deposit_l( 0 );
		k = 0;
		move16();
		FOR( i = 0; i < L; i++ )
		{
		s = Madd_32_16_r( Madd_32_16_r( s, x0[i], w0[k] ), x1[-i], w1[k] ); /* Qx */
		s2 = Madd_32_16_r( Madd_32_16_r( s2, y0[i], v0[k] ), y1[-i], v1[k] ); /* Qx */
		k = k + pitch_res;
		}

		/* s2 *= ALPHA;
		normal: synth_ltp[j] = synth[j] - gain * s2 + gain * s;
		zir: synth_ltp[j] = synth[j] - gain * s2 + gain * s - zir[j];
		fade-in/out: synth_ltp[j] = synth[j] - alpha * gain * s2 + alpha * gain * s; */
		L_tmp = L_sub_sat( s, Mpy_32_16_r( s2, ALPHA ) ); /* Qx */
		L_tmp2 = Mpy_32_16_r( L_tmp, gain ); /* Qx */
		L_tmp2 = L_add_sat( synth[j], L_tmp2 ); /* Qx */

		synth_ltp[j] = L_tmp2; /* Qx */
		move16();

		x0++;
		x1++;
		y0++;
		y1++;
		}

		}
		}
		ELSE
		{
		Copy32( synth, synth_ltp, length ); /* Qx */
		}