Git-Mirrors/portapack-mayhem
1
0
Fork 0
mirror of https://github.com/eried/portapack-mayhem.git synced 2025-08-08 06:32:35 -04:00
Code Issues Projects Releases Packages Wiki Activity

Adding_WFM_AM_mode_to_Audio_App (#2644)

Browse source 
* Adding_WFM_AM_mode_to_Audio_App
* more precise values for cos and sin theta, fix sen_theta to sin_theta
* fix sen_theta to sin_theta
This commit is contained in:
Brumi-2021 2025-05-05 17:48:01 +02:00 • committed by GitHub
parent bd781ce37b
commit 4342f5c0ee
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
18 changed files with 448 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

17
firmware/baseband/audio_output.cpp
View file

@ -52,6 +52,19 @@ void AudioOutput::write_unprocessed(const buffer_s16_t& audio) {
});
}
void AudioOutput::apt_write(const buffer_s16_t& audio) {
std::array<float, 32> audio_f;
for (size_t i = 0; i < audio.count; i++) {
cur = audio.p[i];
cur2 = cur * cur;
mag_am = sqrtf(prev2 + cur2 - (2 * prev * cur * cos_theta)) / sin_theta;
audio_f[i] = mag_am * ki; // normalize.
prev = cur;
prev2 = cur2;
}
write(buffer_f32_t{audio_f.data(), audio.count, audio.sampling_rate});
}
void AudioOutput::write(const buffer_s16_t& audio) {
std::array<float, 32> audio_f;
for (size_t i = 0; i < audio.count; i++) {
@ -72,8 +85,8 @@ void AudioOutput::on_block(const buffer_f32_t& audio) {
if (do_processing) {
const auto audio_present_now = squelch.execute(audio);
hpf.execute_in_place(audio); // IIRBiquadFilter name is "hpf", but we will call with "hpf-coef" for all except AMFM (WFAX) with "lpf-coef"
deemph.execute_in_place(audio);
hpf.execute_in_place(audio); // IIRBiquadFilter name is "hpf", but we will call with "hpf-coef" for all except AMFM (WFAX) with "lpf-coef" and notch for WFMAM (NOAA)
deemph.execute_in_place(audio); // IIRBiquadFilter name is "deemph", but we will call LPF de-emphasis or other LPF for WFAM (NOAA).
audio_present_history = (audio_present_history << 1) | (audio_present_now ? 1 : 0);
audio_present = (audio_present_history != 0);