How was phonetics performed with a phonograph? From the Wikipedia excerpt below, I guess it went something like this:
- A segment was recorded on a phonograph.
- That segment was Filtered each time with a different band-pass filter (I don't understand what this means)
- A spectrogram was built up (from what?)
The study of acoustic phonetics was greatly enhanced in the late 19th century by the invention of the Edison phonograph. The phonograph allowed the speech signal to be recorded and then later processed and analyzed. By replaying the same speech signal from the phonograph several times, filtering it each time with a different band-pass filter, a spectrogram of the speech utterance could be built up.
I'm really interested in learning how phonetics was done before the advent of computers, so any insight into these steps would be very much appreciated. I also read about analysis being done on wax cylinders... That's another story.