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Tools: Tune: SRC: Allow pass of desired gain to src_generate() 

There's need to have a 0 dB gain SRC conversion matrix while
earlier all defaulted to -1 dB. With this change the parameter
cfg.gain can be used with src_generate() function.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
This commit is contained in:
Seppo Ingalsuo 2022-04-21 16:58:27 +03:00 committed by Liam Girdwood
parent 91afe67ae5
commit a0ff2bb277
2 changed files with 12 additions and 4 deletions
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6
tools/tune/src/src_generate.m
View File

@ -13,6 +13,7 @@ function src_generate(fs_in, fs_out, fs_inout, cfg);
% profile - differentiate set with identifier, e.g. 'std'
% quality - quality factor, usually 1.0
% speed - optimize speed, gives higher RAM size, usually 0
% gain - overal filter gain, defaults to -1 dB if empty
%
% If fs_inout matrix is omitted this script will compute coefficients
% for all fs_in <-> fs_out combinations.
@ -34,6 +35,7 @@ if nargin < 4
cfg.profile = 'std';
cfg.quality = 1.0;
cfg.speed = 0;
cfg.gain = -1;
end
if nargin < 3
fs_inout = ones(length(fs_in), length(fs_out));
@ -108,8 +110,8 @@ for b = 1:nfso
m2 = 1;
end
fs3 = fs1*l1/m1;
cnv1 = src_param(fs1, fs3, coef_bits, cfg.quality);
cnv2 = src_param(fs3, fs2, coef_bits, cfg.quality);
cnv1 = src_param(fs1, fs3, coef_bits, cfg.quality, cfg.gain);
cnv2 = src_param(fs3, fs2, coef_bits, cfg.quality, cfg.gain);
if (fs2 < fs1)
% When decimating 1st stage passband can be limited
% for wider transition band

10
tools/tune/src/src_param.m
View File

@ -1,4 +1,4 @@
function cnv = src_param(fs1, fs2, coef_bits, q)
function cnv = src_param(fs1, fs2, coef_bits, q, gain)
% src_param - get converter parameters
%
@ -9,6 +9,7 @@ function cnv = src_param(fs1, fs2, coef_bits, q)
% coef_bits - word length identifier
% q - quality scale filter bandwidth and stopband attenuation,
% 1 is default
% gain - overall gain of SRC, defaults to -1 (dB) if omitted
%
% Copyright (c) 2016, Intel Corporation
@ -44,6 +45,10 @@ function cnv = src_param(fs1, fs2, coef_bits, q)
% Both give about -80 dB THD+N with 24 bit coefficients. With 16 bit
% coefficients THD+N is limited to about -76 dB.
if nargin < 5
gain = -1;
end
if nargin < 4
q = 1.0;
end
@ -62,7 +67,8 @@ cnv.c_sb = 0.5; % Start stopband at Fs/2
cnv.rs = 70; % Stopband attenuation in dB
cnv.rp = 0.1; % Passband ripple in dB
cnv.rp_tot = 0.1; % Max +/- passband ripple allowed, used in test script only
cnv.gain = -1; % Gain in decibels at 0 Hz
cnv.gain = gain; % Gain in decibels at 0 Hz
%% Constrain sub-filter lengths. Make subfilters lengths multiple of four
% is a good assumption for processors.