Transmitter/receiver system
First Claim
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1. A transmitter/receiver system comprising:
- a transmitter which transmits a multi-frequency signal composed of a reference frequency signal having a reference frequency followed by at least an information signal having a frequency different from said reference frequency; and
a receiver which receives said multi-frequency signal and produces an information corresponding to a frequency difference between said information signal and said reference signal,said receiver comprising;
a frequency conversion means having a local oscillator for converting frequencies of said multi-frequency signal to lower frequencies;
a frequency analyzing means for analyzing the lower-converted frequencies of said multi-frequency signal, which comprises a plurality of filters divided into groups each composed of at least three filters, each group being assigned to each of the lower-converted frequencies of said multi-frequency signal;
a decoding means for decoding the analyzed frequencies to produce said information corresponding to said frequency difference, said decoding means controlling a local oscillation frequency of said local oscillator so that a lower-converted frequency signal corresponding to said reference frequency signal is outputted from a filter in a group assigned to said reference frequency signal in said frequency analyzing means; and
a means for changing the grouping of said plurality of filters in said frequency analyzing means so that said lower-converted frequency signal corresponding to said reference frequency signal is outputted from a center filter among said at least three filters in said group assigned to said reference frequency signal.
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Abstract
A transmitter/receiver system for converting digital information into a multi-frequency signal for transmission. A reference frequency signal is first transmitted, then a series of frequencies having information indicative of differences with the reference signal are transmitted, and a receiver discriminates differences with the reference frequency signal to decode the information.
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Citations
1 Claim
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1. A transmitter/receiver system comprising:
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a transmitter which transmits a multi-frequency signal composed of a reference frequency signal having a reference frequency followed by at least an information signal having a frequency different from said reference frequency; and a receiver which receives said multi-frequency signal and produces an information corresponding to a frequency difference between said information signal and said reference signal, said receiver comprising; a frequency conversion means having a local oscillator for converting frequencies of said multi-frequency signal to lower frequencies; a frequency analyzing means for analyzing the lower-converted frequencies of said multi-frequency signal, which comprises a plurality of filters divided into groups each composed of at least three filters, each group being assigned to each of the lower-converted frequencies of said multi-frequency signal; a decoding means for decoding the analyzed frequencies to produce said information corresponding to said frequency difference, said decoding means controlling a local oscillation frequency of said local oscillator so that a lower-converted frequency signal corresponding to said reference frequency signal is outputted from a filter in a group assigned to said reference frequency signal in said frequency analyzing means; and a means for changing the grouping of said plurality of filters in said frequency analyzing means so that said lower-converted frequency signal corresponding to said reference frequency signal is outputted from a center filter among said at least three filters in said group assigned to said reference frequency signal.
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsNagaishi, Yasuo, Horiike, Yoshio, Fukui, Kiyotake
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Primary Examiner(s)Safourek, Benedict V.
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Application NumberUS06/678,032Time in Patent Office868 DaysField of Search364/480, 364/701, 364/702, 364/726, 375/45, 375/48, 375/51, 375/56, 375/88, 375/89, 375/97, 455/37, 455/358, 455/359, 340/825.48, 340/825.73, 340/825.75, 332/9 R, 332/10, 329/104, 329/105, 329/110, 324/77 B, 324/77 D, 324/77 E, 324/77 G, 324/77 H, 324/78 DUS Class Current375/275CPC Class CodesH04L 27/26 Systems using multi-frequen...
