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July 20th 07, 04:16 AM
posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
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A more rational approach -- how I would like to change the cellphone industry.
John Navas wrote:
On Thu, 19 Jul 2007 14:45:00 GMT, wrote in : In rec.radio.amateur.antenna Radium wrote: Digital cell phones should stop using the compression they use and start using monaural WMA compression with a CBR of 20 kbps or less and a sample rate of at least 44.1 KHz. In addition, the following must also apply: The audio bandwidth of the phone system is about 3 KHz. Actually more like 10 KHz. Ahhhhh...an answer by obsfucation! Without qualifying the signal levels at 10 KHz, his answer would be correct. According to AT&T's "Notes on the Network", the bandwidth is actually 400 Hz to 3,200 Hz where you have specific audio levels measured in decibels. This will it explain it on terms equatable to John's telecommunications skill set. http://communication.howstuffworks.com/telephone6.htm |
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