import { Complex } from "./oregondsputil.mjs";
/**
 * SAC style response file. This contains poles and zeros to represent the
 * analog stage, plus a constant for the overall gain. See
 * seisplotjs.transfer.convertToSacPoleZero() for conversion from a
 * StationXML response to SacPoleZero.
 */
export declare class SacPoleZero {
    /**
     * Complex poles
     */
    poles: Array<InstanceType<typeof Complex>>;
    /**
     * Complex zeros
     */
    zeros: Array<InstanceType<typeof Complex>>;
    /**
     * Scalar overall gain
     */
    constant: number;
    /** number of zeros added to convert to displacement, for debugging */
    gamma: number | undefined;
    /** hertz/radian factor, for debugging */
    mulFactor: number;
    /** sensitivity accounting for gamma, for debugging */
    sd: number;
    /** normalization factor for poles and zeros accounting for gamma, for debugging */
    A0: number;
    constructor(poles: Array<InstanceType<typeof Complex>>, zeros: Array<InstanceType<typeof Complex>>, constant: number);
    toString(): string;
    evalPoleZeroInverse(freq: number): InstanceType<typeof Complex>;
    trimZeros(gamma: number): void;
    toText(): string;
    /**
     * Caclulates the frequency response from the given poles and zeros.
     *
     * @param freqs frequencies to compute
     * @returns  frequency response
     */
    calcForDisplay(freqs: Array<number>): Array<InstanceType<typeof Complex>>;
    /**
     * Parses a string in sac polezero format into a SacPoleZero.
     *
     * @param data string to parse
     * @returns SacPoleZero instance
     */
    static parse(data: string): SacPoleZero;
}
export declare function geomspace(start: number, stop: number, num: number): Array<number>;
export declare function logspace(start: number, stop: number, num: number): Array<number>;
export declare function linspace(start: number, stop: number, num: number): Array<number>;
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