Feedforward and feedback control in a radio

Details Feedforward and feedback control in a radio Feedforward and feedback control in a radio

1999-11-16

2002-07-23

Hunter, Daniel (Department: 2684)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

C455S150100, C455S161100, C455S161200, C455S183100, C455S183200, C375S316000, C375S324000

Reexamination Certificate

active

06424825

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to radio systems and more particularly to an improved back end for radio signal control.
RELATED ART
Radio systems are known in the art of communications between communication devices. One type of radio receives analog radio signals through an antenna where the analog signals are passed to a front end of the radio. The front end communicates with back-end circuitry to assist the back-end to convert the received analog signal into audio or data information. The back-end is controlled in part by a micro-processor, micro-controller, or other type of processing circuitry.
As an analog radio signal passes through a communications channel, various signal impairments are introduced into the analog signal and interfere with desired radio outputs. This is true whether the analog radio signal is an amplitude modulated (AM) or frequency modulated (FM) signal. Those skilled in the art recognize the existence of signal impairments and past efforts to remove the impairments have not been completely satisfactory.
A completely satisfactory technique for removing the signal impairments has not been developed and improvements in this area of technology reflect a significant advancement in the art of radio signal transmissions.
Further limitations and disadvantages of conventional and traditional systems will become apparent to one of skill in the art through comparison of such systems with the present invention as set forth in the remainder of the present application with reference to the drawings.


REFERENCES:
patent: 4502078 (1985-02-01), Steckler et al.
patent: 4561112 (1985-12-01), Ridder
patent: 4947456 (1990-08-01), Atkinson et al.
patent: 5454118 (1995-09-01), Simmons et al.
patent: 5577076 (1996-11-01), Sato et al.

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