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Merge pull request #402 from TomHarte/AudioCutoff

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Ensures artificial audio frequency limits are honoured.
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Thomas Harte 2018-04-05 19:05:48 -04:00 committed by GitHub
commit a849b3f2e4
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1 changed files with 6 additions and 6 deletions
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12
Outputs/Speaker/Implementation/LowpassSpeaker.hpp
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@ -204,22 +204,22 @@ template <typename T> class LowpassSpeaker: public Speaker {
} filter_parameters_;
void update_filter_coefficients(const FilterParameters &filter_parameters) {
float high_pass_frequency = filter_parameters.output_cycles_per_second / 2.0f;
if(filter_parameters.high_frequency_cutoff > 0.0) {
high_pass_frequency = std::min(filter_parameters.high_frequency_cutoff, high_pass_frequency);
}
// Make a guess at a good number of taps.
std::size_t number_of_taps = static_cast<std::size_t>(
ceilf((filter_parameters.input_cycles_per_second + filter_parameters.output_cycles_per_second) / filter_parameters.output_cycles_per_second)
ceilf((filter_parameters.input_cycles_per_second + high_pass_frequency) / high_pass_frequency)
);
number_of_taps = (number_of_taps * 2) | 1;
output_buffer_pointer_ = 0;
stepper_.reset(new SignalProcessing::Stepper(
static_cast<uint64_t>(filter_parameters.input_cycles_per_second),
static_cast<uint64_t>(filter_parameters.output_cycles_per_second)));
float high_pass_frequency = filter_parameters.output_cycles_per_second / 2.0f;
if(filter_parameters.high_frequency_cutoff > 0.0) {
high_pass_frequency = std::min(filter_parameters.output_cycles_per_second / 2.0f, high_pass_frequency);
}
filter_.reset(new SignalProcessing::FIRFilter(
static_cast<unsigned int>(number_of_taps),
filter_parameters.input_cycles_per_second,