export interface MatrixHilbertTransformOptions {
    /**
     * Float64Array[] variable to store the result of hilbert transform
     */
    output?: Float64Array[];
}
/**
 * Apply the Hilbert transform to each row of a real-valued matrix, reusing a
 * single FFT instance for all rows to avoid repeated instantiation overhead.
 * All rows must have the same length, which must be a power of two.
 * @param rows - array of real-valued Float64Array rows
 * @param options - options
 * @returns array of Hilbert-transformed Float64Array rows
 * @see DOI: 10.1109/TAU.1970.1162139 "Discrete Hilbert transform"
 */
export declare function matrixHilbertTransform(rows: Float64Array[], options?: MatrixHilbertTransformOptions): Float64Array[];
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