/** RMS above which a native output-level window counts as assistant speech. */
export declare const OUTPUT_ACTIVE_LEVEL = 0.015;
/** Quiet time after the last loud window before assistant speech counts as over. */
export declare const OUTPUT_RELEASE_MS = 400;
/**
 * Debounced assistant-speech detector over native output-level windows (~50 ms each).
 *
 * Rises on the first loud window and falls only after {@link OUTPUT_RELEASE_MS} without
 * another, so pauses between words do not flip the live phase between `speaking` and
 * `listening`. Used by `LiveSessionController`, which re-derives its phase on `onRelease`.
 */
export declare class OutputActivity {
    #private;
    constructor(onRelease: () => void);
    /** Whether the assistant is speaking, including the release hold. */
    get active(): boolean;
    /** Records one output-level window; loud windows restart the release hold. */
    observe(level: number): void;
    /** Cancels a pending release without notifying. */
    dispose(): void;
}