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Change baseband floats to normalize at +/-1.0.

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This commit is contained in:
Jared Boone
2016-02-14 12:38:50 -08:00
parent a5ed3b20b4
commit ef86848139
10 changed files with 35 additions and 26 deletions
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4
firmware/baseband/spectrum_collector.cpp
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@@ -117,8 +117,8 @@ void SpectrumCollector::update() {
// Three point Hamming window.
const auto corrected_sample = channel_spectrum[i] * 0.54f
+ (channel_spectrum[(i-1) & 0xff] + channel_spectrum[(i+1) & 0xff]) * -0.23f;
const auto mag2 = magnitude_squared(corrected_sample);
const float db = complex16_mag_squared_to_dbv_norm(mag2);
const auto mag2 = magnitude_squared(corrected_sample * (1.0f / 32768.0f));
const float db = mag2_to_dbv_norm(mag2);
constexpr float mag_scale = 5.0f;
const unsigned int v = (db * mag_scale) + 255.0f;
spectrum.db[i] = std::max(0U, std::min(255U, v));