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Add ChannelDecimator decimate by 2 and no-shift options.

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This commit is contained in:
Jared Boone
2015-11-19 12:24:20 -08:00
parent ccd64f3cd9
commit 060da5d227
2 changed files with 29 additions and 14 deletions
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23
firmware/baseband/channel_decimator.cpp
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@@ -39,14 +39,10 @@ buffer_c16_t ChannelDecimator::execute_decimation(buffer_c8_t buffer) {
* -> gain of 256
* -> decimation by 2
* -> 1.544MHz complex<int16_t>[1024], [-32768, 32512] */
const auto stage_0_out = translate.execute(buffer, work_baseband_buffer);
//if( fs_over_4_downconvert ) {
// // TODO:
//} else {
// Won't work until cic_0 will accept input type of buffer_c8_t.
// stage_0_out = cic_0.execute(buffer, work_baseband_buffer);
//}
auto stage_0_out = execute_stage_0(buffer, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By2 ) {
return stage_0_out;
}
/* 1.536MHz complex<int16_t>[1024], [-32768, 32512]
* -> 3rd order CIC: -0.1dB @ 0.028fs, -1dB @ 0.088fs, -60dB @ 0.468fs
@@ -82,3 +78,14 @@ buffer_c16_t ChannelDecimator::execute_decimation(buffer_c8_t buffer) {
return cic_4_out;
}
buffer_c16_t ChannelDecimator::execute_stage_0(
buffer_c8_t buffer,
buffer_c16_t work_baseband_buffer
) {
if( fs_over_4_downconvert ) {
return translate.execute(buffer, work_baseband_buffer);
} else {
return cic_0.execute(buffer, work_baseband_buffer);
}
}