In-band common frequency digital code cordless telephone

An in-band co-frequency, cordless telephone technology, applied in the direction of telephone communication, electrical components, branch office equipment, etc., can solve the problems of low frequency utilization rate, low channel capacity, and low degree of integration of analog cordless telephones, and achieve functional Easy to upgrade and expand, high spectrum utilization, and the effect of saving spectrum resources
CN1413005AInactive Publication Date: 2003-04-23SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2003-04-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The in-band digital wireless telephone is formed from two portions of mother machine and submachine. Its circuit portion is formed from control circuit, digital signal processing circuit, radio-frequency receiving and transmitting circuit, speech receiving and transmitting circuit, storage circuit, display circuit, keyboard input circuit, A / D converter circuit, interface circuit and power supply circuit which are mutually electrically connected together. Said invention integrates the modern digital signal processing techniques of speech coding, channel coding, digital modulation and demodulation and digital channel equalization into one body, and adopts monolithic integrated circuit chip to implement said invention, so that it can obtain high session quality, etc.
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Description

(1) Technical field

[0001] The invention relates to the technical field of communication, signal processing and software radio, in particular to an in-band co-frequency digital cordless telephone. (2) Background technology

[0002] At present, my country's cordless phones are still dominated by analog cordless phones. There are many deficiencies in analog telephones: first, analog cordless telephones transmit analog signals, the signal processing method is simple, the power consumption is relatively large, and the influence of interference and noise cannot be effectively eliminated, resulting in unsatisfactory call quality in many cases; Second, the frequency utilization rate of analog cordless phones is not high, and the channel capacity is low. The cordless phone standard formulated in my country in 1994 is 20 pairs of frequencies of 45 / 48MHz, and the frequency bandwidth occupied by each channel is 25kHz; The analog cordless phone uses analog modulation transmission, which ...

Claims

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