ftp.nice.ch/pub/next/audio/apps/Tuner.NI.b.tar.gz#/Tuner/FFTFrequency.h

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/* TunerApp.h -- copyright 1992, 1994 by C.D.Lane */

#import "Frequency.h"

#import <musickit/musickit.h>

#define LOG2_FFTSIZE (11)
#define FFT_SIZE (1 << LOG2_FFTSIZE)

@interface FFTFrequency : Frequency
{
	float rate;
	double pitches[c8k], hits[c8k];
	float real[FFT_SIZE], imaginary[FFT_SIZE];
}

- init;

- (double) computeFrequency:sample;

- (double) toleranceAtFrequency:(double) freq;

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.