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modi123_1, on 29 November 2011 - 11:04 AM, said:
Upgrading your 2600baud modem to a 56k ...
I wish I had a 2600baud modem.
16 Replies - 2409 Views - Last Post: 16 December 2011 - 07:36 AM
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dbasnett
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Re: Modem is 56k and the bandwidth supplied is 64k...
Posted 16 December 2011 - 07:36 AM
56,000 bits per second was the data rate. The other 8,000 bits is for framing/stop/start bits. For a very long time the rate of a voice channel has been 64,000 bits per second.
The number comes from (freq. sampled x 2) x 8 bit samples. The freq. sampled is in the range of 300 - 3400 hz and is allocated 4000hz in the system. So 4000 x 2 x 8 = 64,000. This is called the Nyquit rate, and based on the works of Nyquist and Shannon.
The number comes from (freq. sampled x 2) x 8 bit samples. The freq. sampled is in the range of 300 - 3400 hz and is allocated 4000hz in the system. So 4000 x 2 x 8 = 64,000. This is called the Nyquit rate, and based on the works of Nyquist and Shannon.
This post has been edited by dbasnett: 16 December 2011 - 07:50 AM
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