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specan: cleared up terminology, accounted for decimation.

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Channel spectrum decimation now accounted for when computing filter frequencies.
Renamed a bunch of variables relating to channel spectrum bandwidth and filter frequencies.
This commit is contained in:
Jared Boone 2015-07-17 22:55:18 -07:00
parent 98bd9c54e4
commit ffc50785b7
3 changed files with 36 additions and 28 deletions
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54
firmware/application/ui_spectrum.hpp
View file

@ -37,29 +37,29 @@ namespace spectrum {
class FrequencyScale : public Widget {
public:
void set_spectrum_bandwidth(const uint32_t new_bandwidth, const size_t new_spectrum_bins) {
if( (spectrum_bandwidth != new_bandwidth) ||
void set_spectrum_sampling_rate(const uint32_t new_sampling_rate, const size_t new_spectrum_bins) {
if( (spectrum_sampling_rate != new_sampling_rate) ||
(spectrum_bins != new_spectrum_bins) ) {
spectrum_bandwidth = new_bandwidth;
spectrum_sampling_rate = new_sampling_rate;
spectrum_bins = new_spectrum_bins;
set_dirty();
}
}
void set_channel_filter(
const uint32_t pass_bandwidth,
const uint32_t stop_bandwidth
const uint32_t pass_frequency,
const uint32_t stop_frequency
) {
if( (channel_filter_pass_bandwidth != pass_bandwidth) ||
(channel_filter_stop_bandwidth != stop_bandwidth) ) {
channel_filter_pass_bandwidth = pass_bandwidth;
channel_filter_stop_bandwidth = stop_bandwidth;
if( (channel_filter_pass_frequency != pass_frequency) ||
(channel_filter_stop_frequency != stop_frequency) ) {
channel_filter_pass_frequency = pass_frequency;
channel_filter_stop_frequency = stop_frequency;
set_dirty();
}
}
void paint(Painter& painter) override {
if( !spectrum_bandwidth || !spectrum_bins ) {
if( !spectrum_sampling_rate || !spectrum_bins ) {
// Can't draw without non-zero scale.
return;
}
@ -77,16 +77,16 @@ public:
);
*/
if( channel_filter_pass_bandwidth ) {
const auto pass_width = channel_filter_pass_bandwidth * spectrum_bins / spectrum_bandwidth;
const auto stop_width = channel_filter_stop_bandwidth * spectrum_bins / spectrum_bandwidth;
if( channel_filter_pass_frequency ) {
const auto pass_offset = channel_filter_pass_frequency * spectrum_bins / spectrum_sampling_rate;
const auto stop_offset = channel_filter_stop_frequency * spectrum_bins / spectrum_sampling_rate;
const auto pass_x_lo = x_center - pass_width / 2;
const auto pass_x_hi = x_center + pass_width / 2;
const auto pass_x_lo = x_center - pass_offset;
const auto pass_x_hi = x_center + pass_offset;
if( channel_filter_stop_bandwidth ) {
const auto stop_x_lo = x_center - stop_width / 2;
const auto stop_x_hi = x_center + stop_width / 2;
if( channel_filter_stop_frequency ) {
const auto stop_x_lo = x_center - stop_offset;
const auto stop_x_hi = x_center + stop_offset;
const Rect r_stop_lo {
static_cast<Coord>(r.left() + stop_x_lo), r.top(),
@ -131,10 +131,10 @@ public:
}
private:
uint32_t spectrum_bandwidth { 0 };
uint32_t spectrum_sampling_rate { 0 };
size_t spectrum_bins { 0 };
uint32_t channel_filter_pass_bandwidth { 0 };
uint32_t channel_filter_stop_bandwidth { 0 };
uint32_t channel_filter_pass_frequency { 0 };
uint32_t channel_filter_stop_frequency { 0 };
};
class WaterfallView : public Widget {
@ -225,11 +225,19 @@ private:
void on_channel_spectrum(const ChannelSpectrum& spectrum) {
waterfall_view.on_channel_spectrum(spectrum);
frequency_scale.set_spectrum_bandwidth(spectrum.bandwidth, spectrum.db_count);
frequency_scale.set_spectrum_sampling_rate(spectrum.sampling_rate, spectrum.db_count);
// TODO: Set with actual information.
//taps_64_lp_042_078_tfilter
frequency_scale.set_channel_filter(spectrum.bandwidth * 2 * 42 / 1000, spectrum.bandwidth * 2 * 78 / 1000);
// TODO: Pass these details, don't hard-code them.
// Channel spectrum is channel filter input, decimated by 2 by the
// channel filter, then by 4 by the channel spectrum decimator.
constexpr size_t channel_spectrum_decimation = 2 * 4;
// TODO: Rename spectrum.bandwidth to spectrum.sampling_rate so this makes sense. */
frequency_scale.set_channel_filter(
spectrum.sampling_rate * channel_spectrum_decimation * 42 / 1000,
spectrum.sampling_rate * channel_spectrum_decimation * 78 / 1000
);
}
};