Simulcast transmission system with improved synchronizing system
First Claim
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1. A simulcast transmission system comprising:
- a plurality of neighboring transmitting stations having overlapping individual broadcast ranges spatially arranged throughout a broadcast area and each including a first modulator for modulating a carrier frequency with a wanted signal in accordance with a first type of modulation, a second modulator for modulating the same carrier frequency with a unique auxiliary signal which uniquely identifies each transmitting station in accordance with a second type of modulation and a transmitter for transmitting the modulated carrier frequency; and
at least one receiver for receiving the modulated carrier frequency and analyzing means for separately analyzing the different auxiliary signals and identifying each transmitter by its unique auxiliary signal.
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Abstract
In a simulcast transmission system, a plurality of simulcast transmitters are spatially distributed throughout a broadcasting area, broadcast substantially at the same carrier frequency and are synchronously modulated with a wanted simulcast signal, at least two of the simulcast transmitters being simultaneously modulated with at least one further auxiliary signal with a type of modulation which is different from that wanted signal, and at least one of the receiver comprises means for separately evaluating the different wanted signal and auxiliary signal modulations.
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Citations
12 Claims
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1. A simulcast transmission system comprising:
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a plurality of neighboring transmitting stations having overlapping individual broadcast ranges spatially arranged throughout a broadcast area and each including a first modulator for modulating a carrier frequency with a wanted signal in accordance with a first type of modulation, a second modulator for modulating the same carrier frequency with a unique auxiliary signal which uniquely identifies each transmitting station in accordance with a second type of modulation and a transmitter for transmitting the modulated carrier frequency; and at least one receiver for receiving the modulated carrier frequency and analyzing means for separately analyzing the different auxiliary signals and identifying each transmitter by its unique auxiliary signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A simulcast transmission system, comprising:
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a plurality of neighboring transmitting stations having overlapping individual broadcast ranges spatially arranged throughout a broadcast area, each of said transmitting stations having first modulator means for modulating a carrier frequency with a wanted signal in accordance with a first type of modulation, and a second modulator means for modulating the same carrier frequency with a unique auxiliary signal which uniquely identifies the respective transmitting station in accordance with a second type of modulation, and a transmitter means for transmitting the modulated carrier frequency; a central control station means connected by cables to each of said transmitting stations for transmitting said wanted signal to each of said transmitting stations and for sending each of said unique auxiliary signals to the respective transmitting stations; receiver means in said broadcast area for receiving said modulated carrier frequency; and analyzer means connected to said receiver means and said central control station means for analyzing said auxiliary signals, based on the analysis, and synchronizing wanted signal transmission from each of said stations in the overlapping broadcast ranges. - View Dependent Claims (12)
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Specification