NAME

tone - generate a pure tone.

CONTENTS

Syntax
Description
Options
Examples
Copyright

tone [options]

Generate samples of a sine wave at a given sample rate.Specify wave amplitude, and frequency (in Hz or kHz), or alternativelyperiod (in s, ms, or p (sample points) ). If both period and frequencyare specified, then the given period takes precedence.If S is the given samplerate so that Ts=1/S is the sample interval,and phi is the given phase (in samples or time units),then each sample of a sine wave of frequency f [Hz] is given by:

        sin( TWOPI.f ( n.Ts + phi ) ) ,  n = 0,1,2,...

Write samples to the stdout in the given datatype for the given waveform duration.

1. period, frequency

The frequency (in Hz or kHz) and the period (in s, ms, or p (sample points) )of the output waveform. Either may be specified, but if both period and frequencyare specified, then the given period takes precedence.

2. amplitude

The amplitude of the output waveform.

3. phase

The phase offset of the output sine wave with respect to the origin.This may be specified as a time (with units s or ms) or as a number ofsamples (with units p or no units), or in degrees (with units deg),or the following strings are recognised(and may be abbreviated provided this is unambiguous):sine (0 phase offset), cosine (1/4 cycle phase offset),antisine (1/2 cycle phase offset), anticosine (3/4 cycle phase offset).

4. type

The datatype of the output waveform. The following strings are recognisedtypes: char, short, int, float, double, ascii (meaning one ascii number perline).

1. Sine wave with period 10ms sampled at 10kHz, (100 sample points per period)

            tone period=10ms samplerate=10kHz

2. Sine wave with frequency 100Hz sampled at 20kHz

            tone frequency=100Hz

3. Sine wave with period 100 sample points, with dc-offset set equal toamplitude of 500 so that waveform is just non-negative.

            tone period=100p amplitude=500 offset=500

4. Quarter cycle of a sine wave with 8ms period.

            tone period=8ms duration=2ms

5. Cosine wave with 8ms period.

            tone period=8ms phase=cos

This is equivalent to:

            tone period=8ms phase=2ms

options ptrain

Copyright (c) Applied Psychology Unit, Medical Research Council, 1995

Permission to use, copy, modify, and distribute this software without feeis hereby granted for research purposes, provided that this copyrightnotice appears in all copies and in all supporting documentation, and thatthe software is not redistributed for any fee (except for a nominalshipping charge). Anyone wanting to incorporate all or part of thissoftware in a commercial product must obtain a license from the MedicalResearch Council.

The MRC makes no representations about the suitability of thissoftware for any purpose. It is provided "as is" without express orimplied warranty.

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