CHIRPS.TXT

These files contain chirps for use with the piezo-disk impedance head.  They 
can be played by a standard sound file player such as Windows Sound Recorder 
or Cool Edit.  A second instance (the same program running in a second window)
can be used to record the system response.

Although these signals, known as "Schroeder chirps", sound like rapid sweeps, 
they are actually composed by summing individual sinusoids that are running 
continuously.  Each sinusoid has a frequency at the center of its corresponding 
frequency bin when analyzed using an FFT, for example, with Cool Edit, or WavPrism.  
Therefore, it is best to use a "rectangular" analysis window.  The files in this 
directory are all designed for FFT lengths of 1024 samples.

The file names have suffixes "xxx_yK", where xxx is the lowest frequency in Hz
and yK is the highest frequency as kHz.  The file c100_5k.wav is perfectly 
flat from 100 Hz to 5kHz, with no signal outside that range.  The files labelled
"cc..." have all been equalized ("corrected") by a -6dB/octave filter in order 
to partially compensate for the response of the piezodisk.

Peter Hoekje
Dept. of Physics and Astronomy
Baldwin-Wallace College
Berea, OH 44017
phoekje@bw.edu
440-826-2494



 Volume in drive A is CHIRPS
 Volume Serial Number is 3839-3120

 Directory of A:\

10/10/98  03:35p               110,636 cc100_5k.wav
10/10/98  03:08p               110,636 cc100_3k.wav
10/10/98  03:37p               110,636 cc100_4k.wav
10/10/98  03:41p               110,636 c100_5k.wav
10/10/98  03:09p               110,636 cc200_3k.wav
10/10/98  03:10p               110,636 cc200_4k.wav
10/10/98  03:10p               110,636 cc200_5k.wav
10/10/98  03:33p               110,636 cc500_1k.wav
10/10/98  03:34p               110,636 cc500_2k.wav
10/10/98  03:33p               110,636 cc500_5k.wav
10/10/98  04:25p                 2,045 chirps.txt
              12 File(s)      1,108,405 bytes
                                344,576 bytes free