applyNoiseGate()

void fl::audio::SignalConditioner::applyNoiseGate ( span< const i16 > pcm, vector< i16 > & output )

private

Apply noise gate with hysteresis.

Parameters

pcm	Input PCM samples (DC-removed)
output	Output buffer (gated samples, zero if gate closed)

Definition at line 157 of file signal_conditioner.cpp.hpp.

                                                                                            {
    const size count = pcm.size();
    output.clear();
    output.reserve(count);
 
    const i16 openThreshold = mConfig.noiseGateOpenThreshold;
    const i16 closeThreshold = mConfig.noiseGateCloseThreshold;
 
    for (size i = 0; i < count; ++i) {
        const i16 sample = pcm[i];
        const i32 sample32 = static_cast<i32>(sample);
        const i32 absSample = (sample32 < 0) ? -sample32 : sample32;
 
        // Hysteresis logic: Different thresholds for opening vs closing
        if (!mNoiseGateOpen) {
            // Gate is closed - check if signal exceeds open threshold
            if (absSample >= openThreshold) {
                mNoiseGateOpen = true;
            }
        } else {
            // Gate is open - check if signal falls below close threshold
            if (absSample < closeThreshold) {
                mNoiseGateOpen = false;
            }
        }
 
        // Output sample if gate is open, else zero
        output.push_back(mNoiseGateOpen ? sample : 0);
    }
}

References fl::FL_NO_EXCEPT, mConfig, mNoiseGateOpen, and fl::sample().

Referenced by processSample().

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