Method and apparatus for dynamically adapting the clock rate and

Details Method and apparatus for dynamically adapting the clock rate and Method and apparatus for dynamically adapting the clock rate and

1996-11-18

1998-08-25

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 9326, 379 9331, 375222, H04M 1100

Patent

active

057990697

ABSTRACT:
Methods and apparatus are disclosed for detecting the amount of the power available from a phone line and for adjusting the clock rate and data transfer rate of a modem or a device that transfers data over the phone line to provide the best possible performance for the available phone-line power. A method of operating a device for transferring data over a phone line includes the following steps: setting the device off hook; measuring the voltage level of the phone line; determining the amount of the power available from the phone line; selecting a clock rate for the device; setting the device to operate at the clock rate; placing a call; selecting a data transfer rate; and transferring the data. An apparatus for transferring data over a phone line includes a clock generator for generating a first clock signal of a first frequency; a frequency divider for generating multiple clock signals of different frequencies and for outputting one of the multiple clock signals; a data pump for modulating and demodulating data; a sensor for sensing the voltage level of the phone line; a microcontroller for controlling the frequency divider, the data pump and the sensor; a line isolator for blocking hazardous electrical signals from coming into the apparatus; an interface for coupling the microcontroller to a computer host; and a power converter for converting a DC voltage of the phone line to an appropriate DC power supply voltage to be used by the apparatus.

REFERENCES:
patent: 4630126 (1986-12-01), Kaku et al.
patent: 4756007 (1988-07-01), Qureshi et al.
patent: 4803719 (1989-02-01), Ulrich
patent: 5018190 (1991-05-01), Walker et al.
"TMS320 Second-Generation Digital Signal Processors" data sheet (Texas Instruments, Nov. 1990, pp. A-3-A-8.
"80C196KB10/83C196B10/80C196KB12/83C196KB12 Commercial/Express CHMOS Microcontroller" data sheet (Order No. 270918-002, Intel Corp., Nov. 1991, pp. 8-1--8-21).
"SN54HC160, SN54HC162, SN74HC160, SN74HC162 Synchronous 4-Bit Decade Counters" data sheet (Texas Instruments, pp. 2-219--2-230.

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