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Ensures artificial frequency limits are honoured.

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This commit is contained in:
Thomas Harte 2018-04-05 18:40:07 -04:00
parent 60cf6b3cfd
commit dbe3c5c3f8
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_; } filter_parameters_;
void update_filter_coefficients(const FilterParameters &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. // Make a guess at a good number of taps.
std::size_t number_of_taps = static_cast<std::size_t>( 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; number_of_taps = (number_of_taps * 2) | 1;
output_buffer_pointer_ = 0; output_buffer_pointer_ = 0;
stepper_.reset(new SignalProcessing::Stepper( stepper_.reset(new SignalProcessing::Stepper(
static_cast<uint64_t>(filter_parameters.input_cycles_per_second), static_cast<uint64_t>(filter_parameters.input_cycles_per_second),
static_cast<uint64_t>(filter_parameters.output_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( filter_.reset(new SignalProcessing::FIRFilter(
static_cast<unsigned int>(number_of_taps), static_cast<unsigned int>(number_of_taps),
filter_parameters.input_cycles_per_second, filter_parameters.input_cycles_per_second,