EP0051472A1
Expired / Lapsed
EP
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Single sideband receiver
Assignee: Westinghouse Electric Corp
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Filing: 1981-10-30
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Granted: —
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Expires: 2001-10-30
Abstract
Abstract The invention provides a single sideband receiver translates the frequencies of a received signal composed of a data signal (27, Vp) and a pilot tone (22, Vp) to predetermined intermediate frequencies. Filters (68, 70) separate the intermediate frequency data signal and the intermediate frequency pilot tone. The frequency of the intermediate frequency pilot tone is translated to a frequency sufficiently removed from the frequency spectrum of the intermediate frequency data signal so as not to interfere therewith. The translated, intermediate frequency, pilot tone and the intermediate frequency data signal are amplified by a single automatic gain controlled amplifier (48). A demodulator (54) produces audio output signals (V Out ) and a recovered pilot tone (V Pr ) in response to the output signal of the amplifier. The recovered pilot tone is input to a pilot regenerator (60). The output signal of the pilot regenerator is input to the demodulator. The recovered pilot tone is also input to an automatic gain control circuit (62). The automatic gain control circuit together with a gain limiter control (66) the gain of the amplifier.
Inventors
- 👤 Ronald Lloyd Lee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:29
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/30; H04B1/302; H04B3/00; H04B3/02; H04B3/04; H04B3/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
158 words
A single sideband receiver for the reception of signals composed of a data signal (27, V D ) occupying a frequency spectrum and a pilot tone (22, Vp) having a frequency adjacent to the frequency spectrum of the data signal, comprising: means (36) for receiving the data signal and the pilot tone, said receiving means translating the frequency spectrum of said data signal and the frequency of said pilot tone to predetermined intermediate frequencies; filter means (42) separating said intermediate frequency data signal and said intermediate frequency pilot tone; and characterized by: means (50) for translating the frequency of said intermediate frequency pilot tone to a frequency sufficiently removed from the frequency spectrum of said intermediate frequency data signal so as not to interfere therewith; means (48) for amplifying both said translated intermediate frequency pilot tone and said intermediate frequency data signal; and demodulation means (54) producing output signals (V Out ) in response to said amplifier means.
Claim 2
Dependent Claim
158 words
A single sideband receiver for the reception of signals composed of a data signal (27, V D ) occupying a frequency spectrum and a pilot tone (22, Vp) having a frequency adjacent to the frequency spectrum of the data signal, comprising: means (36) for receiving the data signal and the pilot tone, said receiving means translating the frequency spectrum of said data signal and the frequency of said pilot tone to predetermined intermediate frequencies; filter means (42) separating said intermediate frequency data signal and said intermediate frequency pilot tone; and characterized by: means (50) for translating the frequency of said intermediate frequency pilot tone to a frequency sufficiently removed from the frequency spectrum of said intermediate frequency data signal so as not to interfere therewith; means (48) for amplifying both said translated intermediate frequency pilot tone and said intermediate frequency data signal; and demodulation means (54) producing output signals (V Out ) in response to said amplifier means.
Claim 3
Dependent Claim
57 words
The single sideband receiver as claimed in claim 1, wherein the receiving means includes an input filter (34) receiving the data signal and the pilot tone, and includes a mixer (36) responsive to said filter, said mixer translating the frequency spectrum of said data signal and the frequency of said pilot tone to the predetermined intermediate frequencies.
Claim 4
Dependent Claim
43 words
The single sideband receiver as claimed in claim 2, wherein the predetermined intermediate frequencies are substantially higher than the frequencies of the data signal and the pilot tone such that received signals capable of causing false images are rejected by the input filter.
Claim 5
Dependent Claim
29 words
The single sideband receiver as claimed in claim 1, 2, or 3 wherein the intermediate frequency data signal has a frequency spectrum of from 5.2003 megahertz to 5.2034 megahertz.
Claim 6
Dependent Claim
23 words
The single sideband receiver as claimed in claim 1 or 4, wherein the intermediate frequency pilot tone has a frequency of 5.2 megahertz.
Claim 7
Dependent Claim
45 words
The single sideband receiver as claimed in claim 1 or 5, wherein the means for translating the intermediate frequency pilot tone includes a mixer (50), and including a filter (52) responsive to said mixer, said mixer translates the intermediate frequency pilot tone to 4.575 megahertz.
Claim 8
Dependent Claim
53 words
The single sideband receiver as claimed in claim 1 or 6 including an impedance matching circuit [Fig. 3 (80, 94, 107)] located between the filter means separating the intermediate frequency data signal and the intermediate frequency pilot tone from the translating means, said impedance matching circuit also amplifying said intermediate frequency pilot tone.
Claim 9
Dependent Claim
25 words
The single sideband receiver as claimed in claim 1, 6, or 7 wherein the amplifying means includes an automatic gain controlled intermediate frequency amplifier (48).
Claim 10
Dependent Claim
35 words
The single sideband receiver as claimed in claim 1 or 8, wherein the demodulation means includes a quadrature detector producing both a recovered pilot tone (V Pr ) and the output signals (V Out ).
Claim 11
Dependent Claim
34 words
The single sideband receiver as claimed in claim 9 including means (60) producing a regenerated pilot tone (Vp') in response to the recovered pilot tone, said regenerated pilot tone input to the demodulation means.
Claim 12
Dependent Claim
63 words
The single sideband receiver as claimed in claim 9 or 10, including means (62) producing an automatic gain control signal in response to the recovered pilot tone (V Pr ), and including limiting means (66) modifying .the magnitude of said automatic gain control signal in response to the amplifying means, said automatic gain control signal controlling the gain of said means for amplifying.
Claim 13
Dependent Claim
54 words
The single sideband receiver as claimed in claim 11 wherein the means producing the automatic gain control signal includes an automatic gain control circuit responsive to the recovered pilot tone (V Pr ), and includes an integrator (64), said integrator producing said automatic gain control signal in response to said automatic gain control circuit.
Claim 14
Dependent Claim
28 words
The single sideband receiver as claimed in claim 12 wherein the limiting means includes a comparator (121) responsive to both a reference voltage (132) and the amplifying means.
Claim 15
Dependent Claim
24 words
The single sideband receiver as claimed in claim 13 wherein the integrator is reponsive to both said comparator and the automatic gain control circuit.
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