murmuraba/dist/utils/simple-agc.d.ts

Real-time audio noise reduction with advanced chunked processing for web applications

/**
 * Simple Automatic Gain Control - REFACTORED
 * Based on WebSearch results for Web Audio API AGC
 *
 * Key findings from WebSearch:
 * - Use DynamicsCompressorNode for reducing dynamics range
 * - Use AnalyserNode + GainNode for manual AGC
 * - Always use setTargetAtTime to prevent clicks
 * - RMS calculation for accurate level detection
 */
export declare class SimpleAGC {
    private readonly analyser;
    private readonly gainNode;
    private readonly bufferLength;
    private readonly dataArray;
    private readonly targetLevel;
    private readonly attackTime;
    private readonly releaseTime;
    private readonly maxGain;
    private readonly audioContext;
    constructor(audioContext: AudioContext, targetLevel?: number);
    /**
     * Update gain based on current audio level
     * Implements attack/release timing as recommended by WebSearch
     */
    updateGain(): void;
    /**
     * Calculate RMS (Root Mean Square) level
     * Formula from WebSearch MDN examples
     */
    private calculateRMS;
    /**
     * Calculate target gain with safety limits
     */
    private calculateTargetGain;
    /**
     * Apply gain with proper timing to prevent clicks
     * Uses exponential ramp as per WebSearch recommendation
     */
    private applyGainSmoothing;
    /**
     * Get current gain value for monitoring
     */
    getCurrentGain(): number;
    /**
     * Connect source -> analyser -> gain -> destination
     */
    connect(source: AudioNode, destination: AudioNode): void;
}
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