Method and communication system for transmitting information
First Claim
1. A method for transmitting information between a transmitter having a PTT-key and a receiver comprising generating an AF signal at the transmitter with speech data from a speech transducer, transmitting the speech data as an RF signal and initiating the transmission by activating the PTT-key, providing additional data for transmission from the transmitter to the receiver and combining the additional data with speech data by suppressing a predetermined portion of an AF speech spectrum of the AF signal, embedding the additional data in the suppressed portion of the AF speech spectrum for the transmission thereof with the speech data, demodulating the received RF signal at the receiver, and using the AF signal received by the receiver.
1 Assignment
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Accused Products
Abstract
Information is transmitted between a transmitter, on board of an aircraft for example, having a PTT-key and a receiver, at an air traffic ground control station for example, by generating an AF signal at the transmitter with speech data from a speech transducer. The AF signal is converted into an RF signal and the transmission of the RF signal is initiated by activating the PTT-key. Additional data for transmission from the transmitter to the receiver is combined with speech data by suppressing a predetermined portion of an AF speech spectrum of the AF signal and embedding the additional data in the suppressed portion of the AF speech spectrum. The RF signal is demodulated at the receiver and used.
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Citations
28 Claims
- 1. A method for transmitting information between a transmitter having a PTT-key and a receiver comprising generating an AF signal at the transmitter with speech data from a speech transducer, transmitting the speech data as an RF signal and initiating the transmission by activating the PTT-key, providing additional data for transmission from the transmitter to the receiver and combining the additional data with speech data by suppressing a predetermined portion of an AF speech spectrum of the AF signal, embedding the additional data in the suppressed portion of the AF speech spectrum for the transmission thereof with the speech data, demodulating the received RF signal at the receiver, and using the AF signal received by the receiver.
- 19. Apparatus for transmitting information between a transmitter and a receiver comprising a provider of an AF signal of speech data from a speech transducer at the transmitter, a modulator for converting the AF signal into an RF signal, a transmitting unit including a PTT-key for initiating the transmission of the RF signal, a source of additional data for transmission from the transmitter to the receiver with the speech data, a connection unit at the transmitter between the speech transducer and the transmitting unit for combining the speech data with the additional data, a suppressor for suppressing a predetermined portion of an AF speech spectrum of the AF signal at the transmitter, means for embedding the additional data in the suppressed portion of the AF speech spectrum for the transmission thereof with the speech data in response to the activation of the PTT-key, a demodulator at the receiver for demodulating the received RF signal, and means for using the demodulated signal at the receiver.
Specification