Waveform generation tools

 a set of tools for imitating a laboratory Signal Generator,
 generating audio signals out of Linux's /dev/dsp audio device. There
 is support for mono and/or stereo and 8 or 16 bit samples. The tools
 include:
 .
  * soundinfo: display some of the programming capabilities of the
 sound system support for the mixer device /dev/mixer and the DSP
 device. Also shows some of the ioctl calls in action.
 .
  * signalgen: a command line signal generator where details are specified
 from the command line for generating sine, cos, square, triangle,
 sawtooth, pulse, noise waves. Frequency, sample rate, relative
 amplitude etc. can be specified through command line options. The
 signal is played continuously until the program is stopped. There
 are options to save the basic raw digital samples raw to file or to a
 WAVE format file.
 .
  * swgen: a command line sweep generator. Both the sweeping and
 swept waveforms can be specified, along with the sweeping frequency
 and the swept frequency range. Otherwise similar to sgen above.
 .
  * siggen: an Ncurses screen based Signal Generator for two separate
 channels. On stereo audio cards the two channels are played on
 separate outputs. On mono cards the two channels are digitally mixed
 onto the one output. Type of waveform, frequency, amplitude, sample
 rate etc are specified/changed via a screen menu. It plays
 continuously. Changes to parameters take effect nearly immediately.
 .
  * sweepgen: an Ncurses screen based Sweep generator (see swgen and
 siggen above).
 .
  * tones: a command line program to generate several successive tones
 of varying frequency, and optional differing waveforms, durations and
 intensities. The sequence of tones can be either played once, or
 repetitively or the samples can be written to a file in raw or WAV
 format. This could make the basis of an auto-dialer for tone phones.
 .
  * smix: a simple command line program for getting and setting the
 mixer settings.
 .
  * fsynth: an Ncurses based fourier synthesis realtime generator.