Why in PSTN (wireline telephony between central offices) digitized voice is repr

Question

Why in PSTN (wireline telephony between central offices) digitized voice is

represented with the bit stream of 64kbps and in digital cell phones voice is represented as a bit stream of around 8kbps. After all, the smaller bit rate in PSTN representing one voice channel would allow squeezing of more voice conversations on a physical line with finite BW. With this, incumbent telco service providers (Bell Canada) would generate more revenue.

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frames!!!!

Explanation / Answer

1. There was a good thinking of providing a good trade-off between the quality and the bandwidth.
2. Actually, you are being wrong in the question as 8kHz is occupied by the single voice signal not 8kbps.
3. Each sample is breaked or you can say quantized into 8 bits, which helps in yielding universally acceptable rate of 64kbps.

4. Before digital signal transmission, the single voice audio or telephone audio was used to be analog modulated into a narrow-band channel so that the use becomes easy and it can be reusable .As , we were now able to send multiple phone calls in a single analog link.

Hope it helps..

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