EP0409100A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for radio-broadcasting and detecting a video signal with at least two associated audio signals, for the modulation and separate use of at least one of said audio signals, and related demodulation device
Assignee: ELETTRONICA INDUSTRIALE SpA
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Filing: 1990-07-13
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Granted: —
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Expires: 2010-07-13
Abstract
Abstract The process comprises the step of providing a modulated carrier video signal (2) and at least a first audio signal (4) and a second audio signal (5); the combining of the video signal and of the first and second audio signals in a combiner-multiplexer (3) so as to obtain a combined video-audio signal; the radio-broadcasting of the combined video-audio signal; the demodulation of the combined video-audio signal (8,10,11,12) so as to extract therefrom at least the second audio signal in a separate demodulated form (13); and the use of the second audio signal in dedicated user means (14,15).
Inventors
- 👤 Italo Riccio
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 04:05
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04H; H04H20/00; H04H20/28; H04H20/36; H04H20/53; H04H20/57; H04H20/65; H04H20/71; H04H20/72
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
Process for radio-broadcasting and detecting a video signal with which at least two audio signals are associated, for demodulating and separately using at least one of said audio signals, and related demodulation device, characterized in that it comprises the steps which consist in: a) providing a modulated carrier video signal and at least a first audio signal and a second audio signal; b) combining said modulated carrier video signal and said at least first and second audio signals in combiner-multiplexer means, so as to obtain a combined video-audio signal; c) radio-broadcasting of said combined video-audio signal; d) demodulating said combined video-audio signal to obtain therefrom at least said second audio signal in a separate demodulated form; and f) using said second audio signal in dedicated user means.
Claim 2
Dependent Claim
127 words
Process for radio-broadcasting and detecting a video signal with which at least two audio signals are associated, for demodulating and separately using at least one of said audio signals, and related demodulation device, characterized in that it comprises the steps which consist in: a) providing a modulated carrier video signal and at least a first audio signal and a second audio signal; b) combining said modulated carrier video signal and said at least first and second audio signals in combiner-multiplexer means, so as to obtain a combined video-audio signal; c) radio-broadcasting of said combined video-audio signal; d) demodulating said combined video-audio signal to obtain therefrom at least said second audio signal in a separate demodulated form; and f) using said second audio signal in dedicated user means.
Claim 3
Dependent Claim
45 words
Process according to claim 1, characterized in that said video signal is an AM-VSSB modulated video signal at 38.9 MHz, said first audio signal being an audio signal modulated at 33.4 MHz and said second audio signal being an audio signal modulated at 33.15 MHz.
Claim 4
Dependent Claim
35 words
Process according to the preceding claims, characterized in that said video signal is preferably any one of the video signals within the frequency band comprised between 470 and 860 MHz (TV channels 21 to 69).
Claim 5
Dependent Claim
40 words
Process according to any one of the preceding claims, characterized in that in said demodulation step d) said video signal is converted in a frequency band of substantially 88-108 MHz and at least said second audio signal is demodulated therefrom.
Claim 6
Dependent Claim
22 words
Process according to any one of the preceding claims, characterized in that said dedicated user means are constituted by a car radio.
Claim 7
Dependent Claim
25 words
Process according to any one of the preceding claims, characterized in that said dedicated user means are constituted by a portable radio and/or the like.
Claim 8
Dependent Claim
36 words
Process according to any one of the preceding claims, characterized in that in said step b) of said process it is possible to insert, in said second audio channel, a code for identifying the transmitting station.
Claim 9
Dependent Claim
36 words
Process according to any one of the preceding claims, characterized in that in said step d) of said process said identification code is extracted from said second audio channel for identification in said dedicated user means.
Claim 10
Dependent Claim
92 words
Demodulation device for executing step d) of the process according to any one of the preceding claims, for demodulating said video signal, characterized in that it comprises, circuitally cascade interconnected: a) receiver antenna means suitable for receiving said carrier video signal and said first and second audio signals carried thereby; b) first selective antenna amplifier means; + c) converter-mixer means suitable for converting said video signal into a preset frequency band which is substantially different from its transmission band; and d) second selective amplifier means suitable for amplifying said preset frequency band.
Claim 11
Dependent Claim
15 words
Device according to claim 9, characterized in that said converter-mixer means comprise programmable oscillator means.
Claim 12
Dependent Claim
21 words
Device according to claim 9, characterized in that said preset frequency band is Band II, substantially from 88 to 108 MHz.
Claim 13
Dependent Claim
13 words
Car radio set comprising a demodulation device according to claims 8 to 10.
Claim 14
Dependent Claim
13 words
Portable radio set comprising a demodulation device according to claims 8 to 10.
References Cited (Backward Citations)
No citation records indexed.
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