Methods and apparatus for simultaneously communicating voice and data in an analog cordless telephone system
First Claim
1. A method of simultaneously communicating voice and data in a cordless telephone system, the method comprising the acts of:
- generating an analog signal from an audible voice signal during a cordless telephone call;
generating a digitally modulated signal from digital data during the cordless telephone call;
summing the analog signal and the digitally modulated signal to produce a composite analog and digital signal;
modulating a radio frequency (RF) carrier with the composite analog and digital signal to produce a modulated RF carrier; and
transmitting the modulated RF carrier.
1 Assignment
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Accused Products
Abstract
A method of simultaneously communicating voice and data on the same channel in an analog cordless telephone system involves generating an analog signal from an audible voice signal during a cordless telephone call; generating a frequency shift keying (FSK) signal from digital data having a nominal frequency of about 20 KHz; summing the analog signal and the FSK signal to produce a composite analog and digital signal; modulating a radio frequency (RF) carrier with the composite analog and digital signal to produce a modulated RF carrier; and transmitting the modulated RF carrier. On the receiving end, the method involves receiving the modulated RF carrier during the call; demodulating the modulated RF carrier to reproduce the composite analog and digital signal; bandpass filtering the composite analog and digital signal to separate the analog signal and the FSK signal from one another; reproducing the audible voice signal from the analog signal; and detecting the digital data from the FSK signal and processing the digital data for display and control.
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Citations
25 Claims
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1. A method of simultaneously communicating voice and data in a cordless telephone system, the method comprising the acts of:
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generating an analog signal from an audible voice signal during a cordless telephone call;
generating a digitally modulated signal from digital data during the cordless telephone call;
summing the analog signal and the digitally modulated signal to produce a composite analog and digital signal;
modulating a radio frequency (RF) carrier with the composite analog and digital signal to produce a modulated RF carrier; and
transmitting the modulated RF carrier. - View Dependent Claims (2, 3, 4, 5)
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6. A method of simultaneously communicating voice and data in a cordless telephone system, the method comprising the acts of:
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receiving a modulated radio frequency (RF) carrier during a cordless telephone call;
demodulating the modulated RF carrier to produce a composite analog and digital signal;
filtering the composite analog and digital signal to separate an analog signal and a digitally modulated signal from one another;
producing an audible voice signal from the analog signal; and
detecting digital data from the digitally modulated signal and processing the digital data for display or control in the cordless telephone system. - View Dependent Claims (7, 8, 9, 10)
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11. A cordless telephone device, comprising:
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an audio circuit which produces an analog signal from an audible voice signal during a cordless telephone call;
a first modulator which modulates a carrier with digital data to produce a digitally modulated signal;
a summer circuit which sums the analog signal and the digitally modulated signal to produce a composite analog and digital signal;
a second modulator which modulates a radio frequency (RF) carrier with the composite analog and digital signal to produce a modulated RF carrier; and
a transmitter which transmits the modulated RF carrier. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A cordless telephone device, comprising:
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a receiver which receives a modulated radio frequency (RF) carrier during a cordless telephone call;
a demodulator which demodulates the modulated RF carrier to produce a composite analog and digital signal;
a filter which filters the composite analog and digital signal to separate an analog signal and a digitally modulated signal from one another;
an audio circuit which produces an audible voice signal from the analog signal;
a detector which detects digital data from the digitally modulated signal;
a processor which processes the digital data for display or control in the cordless telephone device; and
a speaker which remains unmuted during receipt of the digital data. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A cordless telephone device, comprising:
a transmitting portion including;
a first audio circuit which produces a first analog signal from a first audible voice signal during a cordless telephone call;
a frequency shift keying (FSK) signal generator which generates a first FSK signal from first digital data during the cordless telephone call;
a summer circuit which sums the first analog signal and the first FSK signal to produce a first composite analog and digital signal;
a radio frequency (RF) modulator which modulates a first RF carrier with the first composite analog and digital signal to produce a first modulated RF carrier;
a transmitter which transmits the first modulated RF carrier;
a receiving portion including;
a receiver which receives a second modulated RF carrier during the cordless telephone call;
a demodulator which demodulates the second modulated RF carrier to produce a second composite analog and digital signal;
a bandpass filter which filters the second composite analog and digital signal to separate a second analog signal and a second FSK signal from one another;
a second audio circuit which produces a second audible voice signal from the second analog signal;
an envelope detector which detects second digital data from the second FSK signal;
a processor which processes the second digital data for display and control of the cordless telephone device; and
a speaker which remains unmuted during receipt of the second digital data.
Specification