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normalize amplitude from avg absolute amplitude

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This commit is contained in:
Ahmet Inan 2015-01-02 13:25:36 +01:00
parent 3974468399
commit 80eabf5acb
3 changed files with 8 additions and 7 deletions
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11
app/src/main/rs/decoder.rs
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@ -145,13 +145,14 @@ void decode(int samples) {
*saved_width = 0;
*saved_height = 0;
for (int sample = 0; sample < samples; ++sample, ++buffer_pos) {
float amp = audio_buffer[sample] / 32768.0f;
float power = amp * amp;
if (filter(&avg_power, power) < 0.0000001f)
int amp = audio_buffer[sample];
float avg_amp = filter(&avg_amplitude, abs(amp));
if (avg_amp < 16.0f)
continue;
float norm_amp = amp / avg_amp;
complex_t cnt_baseband = convert(&cnt_ddc, amp);
complex_t dat_baseband = convert(&dat_ddc, amp);
complex_t cnt_baseband = convert(&cnt_ddc, norm_amp);
complex_t dat_baseband = convert(&dat_ddc, norm_amp);
float cnt_value = demodulate(&cnt_fmd, cnt_baseband);
float dat_value = demodulate(&dat_fmd, dat_baseband);

2
app/src/main/rs/initialization.rsh
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@ -82,7 +82,7 @@ void initialize(float rate, int length, int width, int height)
const float dat_bandwidth = 800.0f;
const float cnt_bandwidth = 200.0f;
avg_power = ema_cutoff(10.0f, sample_rate);
avg_amplitude = ema_cutoff(10.0f, sample_rate);
leader_lowpass = ema_cutoff(100.0f, sample_rate);
cnt_ddc = ddc(cnt_carrier, cnt_bandwidth, sample_rate);

2
app/src/main/rs/state.rsh
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@ -17,7 +17,7 @@ limitations under the License.
#ifndef STATE_RSH
#define STATE_RSH
static ema_t avg_power, leader_lowpass;
static ema_t avg_amplitude, leader_lowpass;
static ddc_t cnt_ddc, dat_ddc;
static fmd_t cnt_fmd, dat_fmd;
static int current_decoder;