Key chirp -- another view

I selected another view in the Cool Edit 2000 program to help illustrate what the ear easily tells us about chirp in the CW sample from KB4XX. Above is a spectral view showing the initial dah and the following dit sent in the semi-break-in mode. Click on the image to magnify.

This graph plots frequency on the vertical axis, in a limited set of discrete bands, and time on the horizontal axis. Intensity is represented by color, with light colors on the high end of the range, and dark colors on the low end. A steady tone is seen by the solid horizontal bar in the 700 - 1000 Hz range for most of the dah and the dit. The early part of the initial dah shows instability represented by the bright spots above and below the 700 - 1000 Hz band.

Next I'll post corresponding views of the keying sample from W4BXI. All analysis views are based on the audio waveforms recorded from W4UOA's receiver.

-- John