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Revert "Revert "test of a low pass filter in non-FFT space""

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This reverts commit 2bbeca1e01.
This commit is contained in:
Stephen Birarda 2013-03-01 15:34:49 -08:00
parent 23088bbdfd
commit 1c6fa52357
1 changed files with 23 additions and 1 deletions
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24
mixer/src/main.cpp
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@ -37,12 +37,20 @@ const long MIN_SAMPLE_VALUE = std::numeric_limits<int16_t>::min();
const float DISTANCE_RATIO = 3.0/4.2;
const int PHASE_DELAY_AT_90 = 20;
const float BEARING_LOW_PASS_FACTOR = 0.1;
const float ANGLE_TO_SOURCE_LOW_PASS_FACTOR = 0.4;
char DOMAIN_HOSTNAME[] = "highfidelity.below92.com";
char DOMAIN_IP[100] = ""; // IP Address will be re-set by lookup on startup
const int DOMAINSERVER_PORT = 40102;
AgentList agentList(MIXER_LISTEN_PORT);
int16_t lowPassSampleCenteredAtPointer(int16_t *samplePointer) {
return (0.0625 * *(samplePointer - 3)) + (0.125 * *(samplePointer - 2)) + (0.1875 * *(samplePointer - 1)) + (0.25 * *samplePointer) +
(0.1875 * *(samplePointer + 1)) + (0.125 * *(samplePointer + 2)) + (0.0625 * *(samplePointer + 3));
}
void *sendBuffer(void *args)
{
int sentBytes;
@ -134,8 +142,13 @@ void *sendBuffer(void *args)
? otherAgentBuffer->getBuffer() + RING_BUFFER_SAMPLES - numSamplesDelay
: otherAgentBuffer->getNextOutput() - numSamplesDelay;
int16_t *lowPassFrame = new int16_t[(BUFFER_LENGTH_SAMPLES_PER_CHANNEL * 2) / 4];
// calculate the low-pass filter intensity
float lowPassIntensity = ((agentBearing - otherAgentBuffer->getBearing()) * BEARING_LOW_PASS_FACTOR) +
(fabsf(angleToSource) * ANGLE_TO_SOURCE_LOW_PASS_FACTOR);
for (int s = 0; s < BUFFER_LENGTH_SAMPLES_PER_CHANNEL; s++) {
if (s < numSamplesDelay) {
// pull the earlier sample for the delayed channel
@ -149,6 +162,15 @@ void *sendBuffer(void *args)
if (s + numSamplesDelay < BUFFER_LENGTH_SAMPLES_PER_CHANNEL) {
delayedChannel[s + numSamplesDelay] = currentSample;
}
if ((s + 1) % 4 == 0) {
int sampleIndex = ((s + 1) / 4) - 1;
// this will be a sample in the lowPassFrame
lowPassFrame[sampleIndex] = lowPassSampleCenteredAtPointer(clientMix + s);
lowPassFrame[sampleIndex + (BUFFER_LENGTH_SAMPLES_PER_CHANNEL / 4)] = lowPassSampleCenteredAtPointer(clientMix + s + BUFFER_LENGTH_SAMPLES_PER_CHANNEL);
}
clientMix[s] = lowPassFrame[s / 4];
}
}
}