export interface SpeakerFingerprint {
    readonly bands: readonly number[];
    readonly rms: number;
    readonly zcr: number;
}
export interface PrimarySpeakerGateConfig {
    readonly enabled?: boolean;
    readonly similarityThreshold?: number;
    readonly echoDominanceMargin?: number;
    readonly onDecision?: (decision: PrimarySpeakerGateDecision) => void;
}
export interface PrimarySpeakerGateDecision {
    readonly contextId: string;
    readonly signal: "primary_speaker" | "echo_rejected";
    readonly accepted: boolean;
    readonly frameCount: number;
    readonly primaryHits: number;
    readonly echoRejectedFrames: number;
}
export declare class PrimarySpeakerGate {
    private readonly enabled;
    private readonly similarityThreshold;
    private readonly echoDominanceMargin;
    private readonly onDecision?;
    private profile;
    private enrollFrames;
    private bargeInFrames;
    private assistantProfile;
    constructor(config?: PrimarySpeakerGateConfig);
    isEnabled(): boolean;
    hasProfile(): boolean;
    enrollUserTurnChunk(pcm: Uint8Array): void;
    lockProfileFromFirstTurn(): void;
    beginBargeInWindow(): void;
    observeBargeInChunk(pcm: Uint8Array): void;
    observeAssistantPlayout(pcm: Uint8Array): void;
    shouldCommitBargeIn(contextId?: string): boolean;
    resetBargeInWindow(): void;
}
export declare function extractSpeakerFingerprint(pcm: Uint8Array): SpeakerFingerprint | null;
export declare function fingerprintSimilarity(a: SpeakerFingerprint, b: SpeakerFingerprint): number;
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