From bf75c8ec4d0dded188bc7793de6da56c7ff0be1c Mon Sep 17 00:00:00 2001 From: Koen Vos Date: Tue, 13 Dec 2011 14:47:31 -0500 Subject: SILK fixes following last codec WG meeting decoder: - fixed incorrect scaling of filter states for the smallest quantization step sizes - NLSF2A now limits the prediction gain of LPC filters encoder: - increased damping of LTP coefficients in LTP analysis - increased white noise fraction in noise shaping LPC analysis - introduced maximum total prediction gain. Used by Burg's method to exit early if prediction gain is exceeded. This improves packet loss robustness and numerical robustness in Burg's method - Prefiltered signal is now in int32 Q10 domain, from int16 Q0 - Increased max number of iterations in CBR gain control loop from 5 to 6 - Removed useless code from LTP scaling control - Optimization: smarter LPC loop unrolling - Switched default win32 compile mode to be floating-point resampler: - made resampler have constant delay of 0.75 ms; removed delay compensation from silk code. - removed obsolete table entries (~850 Bytes) - increased downsampling filter order from 16 to 18/24/36 (depending on frequency ratio) - reoptimized filter coefficients --- silk/define.h | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'silk/define.h') diff --git a/silk/define.h b/silk/define.h index dcfdee93..fe2a659a 100644 --- a/silk/define.h +++ b/silk/define.h @@ -91,9 +91,6 @@ extern "C" #define MAX_FRAME_LENGTH_MS ( SUB_FRAME_LENGTH_MS * MAX_NB_SUBFR ) #define MAX_FRAME_LENGTH ( MAX_FRAME_LENGTH_MS * MAX_FS_KHZ ) -#define MAX_ENCODER_DELAY 18 -#define MAX_DECODER_DELAY 8 - /* Milliseconds of lookahead for pitch analysis */ #define LA_PITCH_MS 2 #define LA_PITCH_MAX ( LA_PITCH_MS * MAX_FS_KHZ ) @@ -133,7 +130,9 @@ extern "C" #define QUANT_LEVEL_ADJUST_Q10 80 /* Maximum numbers of iterations used to stabilize a LPC vector */ -#define MAX_LPC_STABILIZE_ITERATIONS 20 +#define MAX_LPC_STABILIZE_ITERATIONS 30 +#define MAX_PREDICTION_POWER_GAIN 1e4f +#define MAX_PREDICTION_POWER_GAIN_AFTER_RESET 1e2f #define MAX_LPC_ORDER 16 #define MIN_LPC_ORDER 10 -- cgit v1.2.3