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fix the IIR filter lambdas for 64 samples frame size

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This commit is contained in:
Volker Fischer 2020-03-28 21:02:55 +01:00
parent ede92ac25e
commit eed07615e5
1 changed files with 13 additions and 19 deletions
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32
src/buffer.h
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@ -36,9 +36,6 @@
// hysteresis for buffer size decision to avoid fast changes if close to the bound
#define FILTER_DECISION_HYSTERESIS 0.1
// TODO the following values must be adjusted for 64 samples frame size:
// definition of the upper error bound of the jitter buffers
#define ERROR_RATE_BOUND 0.001
@ -47,22 +44,19 @@
// size state
#define UP_MAX_ERROR_BOUND 0.01
#if ( SYSTEM_FRAME_SIZE_SAMPLES == 64 )
// each regular buffer access lead to a count for put and get, assuming 2.66 ms
// blocks we have 15 s / 1.33 ms * 2 = approx. 22500
# define MAX_STATISTIC_COUNT 22500
// #if ( SYSTEM_FRAME_SIZE_SAMPLES == 64 )
// // each regular buffer access lead to a count for put and get, assuming 2.66 ms
// // blocks we have 15 s / 1.33 ms * 2 = approx. 22500
// #define MAX_STATISTIC_COUNT 22500
//
// // convert numbers from 128 samples case using http://www.tsdconseil.fr/tutos/tuto-iir1-en.pdf
// // and https://octave-online.net:
// // gamma = 1-exp(-Ts/tau)
// // after some calculations we get: x=0.999995;1-exp(64/128*log(1-x))
// // TEST x=0.999995;1-exp(128/64*log(1-x))
// # define IIR_WEIGTH_UP_NORMAL 0.999999999975 // 0.997763932022
// # define IIR_WEIGTH_DOWN_NORMAL 0.99999999 // 0.99
// # define IIR_WEIGTH_UP_FAST 0.99999975 // 0.97763932022
// # define IIR_WEIGTH_DOWN_FAST 0.999999 // 0.9683772233
// #else
// convert numbers from 128 samples case using http://www.tsdconseil.fr/tutos/tuto-iir1-en.pdf
// and https://octave-online.net:
// gamma = exp(-Ts/tau), after some calculations we get: x=0.999995;exp(64/128*log(x))
# define IIR_WEIGTH_UP_NORMAL 0.9999975
# define IIR_WEIGTH_DOWN_NORMAL 0.99994999875
# define IIR_WEIGTH_UP_FAST 0.9997499687422
# define IIR_WEIGTH_DOWN_FAST 0.999499875
#else
// each regular buffer access lead to a count for put and get, assuming 2.66 ms
// blocks we have 15 s / 2.66 ms * 2 = approx. 11000
# define MAX_STATISTIC_COUNT 11000
@ -73,7 +67,7 @@
# define IIR_WEIGTH_DOWN_NORMAL 0.9999
# define IIR_WEIGTH_UP_FAST 0.9995
# define IIR_WEIGTH_DOWN_FAST 0.999
// #endif
#endif
/* Classes ********************************************************************/