From 3de0d42870be01a2554670cda8328cdec2903933 Mon Sep 17 00:00:00 2001 From: ha7ilm Date: Sun, 19 Feb 2017 16:22:49 +0100 Subject: [PATCH] Added to README and --help as well --- README.md | 7 +- csdr.c | 3 +- grc_tests/test_fir_interpolate_cc.grc | 1212 +++++++++++++++++++++++++ libcsdr.c | 4 +- 4 files changed, 1222 insertions(+), 4 deletions(-) create mode 100644 grc_tests/test_fir_interpolate_cc.grc diff --git a/README.md b/README.md index eb8edfe..72620f0 100644 --- a/README.md +++ b/README.md @@ -287,7 +287,12 @@ Other parameters were explained above at `firdes_lowpass_f`. fir_decimate_cc [transition_bw [window]] It is a decimator that keeps one sample out of `decimation_factor` samples. -To avoid aliasing, it runs a filter on the signal and removes spectral components above `0.5 × nyquist_frequency × decimation_factor`. +To avoid aliasing, it runs a filter on the signal and removes spectral components above `0.5 × nyquist_frequency × decimation_factor` from the input signal. + + fir_interpolate_cc [transition_bw [window]] + +It is an interpolator that generates `interpolation_factor` number of output samples from one input sample. +To avoid aliasing, it runs a filter on the signal and removes spectral components above `0.5 × nyquist_frequency / interpolation_factor` from the output signal. `transition_bw` and `window` are the parameters of the filter. diff --git a/csdr.c b/csdr.c index d297f61..a2beb4a 100644 --- a/csdr.c +++ b/csdr.c @@ -88,6 +88,7 @@ char usage[]= " amdemod_cf\n" " amdemod_estimator_cf\n" " fir_decimate_cc [transition_bw [window]]\n" +" fir_interpolate_cc [transition_bw [window]]\n" " firdes_lowpass_f [window [--octave]]\n" " firdes_bandpass_c [window [--octave]]\n" " agc_ff [hang_time [reference [attack_rate [decay_rate [max_gain [attack_wait [filter_alpha]]]]]]]\n" @@ -860,7 +861,7 @@ int main(int argc, char *argv[]) sscanf(argv[2],"%d",&factor); assert(factor >= 1); - float transition_bw = 0.01; + float transition_bw = 0.05; if(argc>=4) sscanf(argv[3],"%g",&transition_bw); assert(transition_bw >= 0 && transition_bw < 1.); diff --git a/grc_tests/test_fir_interpolate_cc.grc b/grc_tests/test_fir_interpolate_cc.grc new file mode 100644 index 0000000..65eb887 --- /dev/null +++ b/grc_tests/test_fir_interpolate_cc.grc @@ -0,0 +1,1212 @@ + + + + Tue Nov 25 18:16:05 2014 + + options + + author + + + + window_size + 1280, 1024 + + + category + Custom + + + comment + + + + description + + + + _enabled + True + + + _coordinate + (10, 10) + + + _rotation + 0 + + + generate_options + wx_gui + + + id + top_block + + + max_nouts + 0 + + + realtime_scheduling + + + + run_options + prompt + + + run + True + + + thread_safe_setters + + + + title + + + + + variable_slider + + comment + + + + converver + float_converter + + + value + 4e3 + + + _enabled + True + + + _coordinate + (8, 331) + + + _rotation + 0 + + + grid_pos + 2,1,1,1 + + + id + input_freq + + + label + + + + max + samp_rate/2 + + + min + -samp_rate/2 + + + notebook + + + + 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ha5kfu_execproc_xx_0 + 0 + 0 + + + blocks_throttle_0 + interp_fir_filter_xxx_0 + 0 + 0 + + + blocks_throttle_0 + wxgui_fftsink2_1 + 0 + 0 + + + blocks_throttle_0 + wxgui_scopesink2_0_0 + 0 + 0 + + + ha5kfu_execproc_xx_0 + wxgui_fftsink2_0 + 0 + 0 + + + ha5kfu_execproc_xx_0 + wxgui_scopesink2_0 + 0 + 0 + + + interp_fir_filter_xxx_0 + wxgui_fftsink2_0_0 + 0 + 0 + + + interp_fir_filter_xxx_0 + wxgui_scopesink2_0_1 + 0 + 0 + + diff --git a/libcsdr.c b/libcsdr.c index 5483f79..04440c5 100644 --- a/libcsdr.c +++ b/libcsdr.c @@ -396,8 +396,8 @@ int fir_interpolate_cc(complexf *input, complexf *output, int input_size, int in float accq=0; //int tistart = (interpolation-ip)%interpolation; int tistart = (interpolation-ip); //why does this work? why don't we need the % part? - for(int ti=tistart, si=0; ti