1970's Vintage Samples of Speech Digitization Techniques - $5 in Ottawa, Ontario for sale

Audio Cassette Tape of 14 samples copied from a 33 rpm record that came with the Oct. 1973 IEEE Spectrum, and article therein: 'Voice Signals: Bit by Bit' by J.W. Bayless, S.J Capanella and A.J. Goldberg. About 6 min. total duration.

1. 64 kb/s PCM (pulse code modulation) with 8 kHz sampling, 8 bit amplitude quantizing and A-law companding
2. 38.4 kb/s DPCM (differencial PCM) with 1 tap predictor, 9.6 kHz sampling and 4 bit linear amplitude quantizing
3. 25.6 kb/s DPCM with 1 tap predictor, 6.4 kHz sampling and 4 bit linear amplitude quantizing
4. 28 kb/s PAPC (pitch adaptive predictive coder) with 8 kHz sampling
5. 19.2 kb/s PAPC with 8 kHz sampling
6. 40 kb/s ADM (adaptive delta modulation)
7. 24 kb/s ADM
8. 16 kb/s ADM
9. 9.6 kb/s VECV (voice exited channel vocoder)
10. 7.2 kb/s LPC (linear predictive coder)
11. 2.4 kb/s LPC
12. 2.4 kb/s PECV (pitch exited channel vocoder)
13. 1.2 kb/s PEFV (pitch exited formant vocoder)
14. 0.6 kb/s PEFV

$5