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US 4,541,101 AGranted
Process and device for voice interpolation in a transmission system for digitized voice
AssigneeThomson-CSF
InventorsJean Potage, Philippe Sidin
Life of this patent
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AssigneeThomson-CSF
InventorsJean Potage, Philippe Sidin
Estimating the term…
The interpolation device for the voice coded in DELTA transmission and transmitted on a fixed frequency or with frequency jumps carrier, comprises in parallel on a classic reception network, a jamming detection device being able to be constituted by a high-pass filter in order to detect the components outside the modulated signal band, a detector circuit with threshold fixing the level of the outside band components characterizing a jamming and possibly a monostable circuit. It comprises, furthermore, a rumbling generator that transmits to the input of the DELTA decoder a rumbling sequence in place of the sequence detected on a stage when this sequence is reckoned as jammed by means of a switch controlled by the output of the monostable circuit.
A process for voice interpolation in a transmission system of digitized voice data operating in a prefiltered FSK narrow band modulation process, comprising:
A device for voice interpolation in a transmission system of digitized voice data by radio using prefiltered FSK modulation, comprising a reception network, a demodulation circuit coupled to said reception network having a demodulated signal output and a decoding circuit, wherein said device comprises a disturbance detection circuit in order to detect at the output of the reception network the energy received outside the modulation band comprising a high-pass filter, having a cut-off frequency at least equal to the highest frequency of the prefiltered modulation band, a threshold detector circuit coupled to the output of said high-pass filter in order to provide a disturbance detection signal and wherein said device further comprises, coupled between the demodulated signal output and the input of the decoding circuit, a switch, a first input of which is connected to the demodulated signal output and an output of which is connected to the input of the decoding circuit, a predetermined pulse sequence generator, the output of which is connected to a second input of the switch, said switch having a control input for receiving the disturbance detection signal.
Dependencies are inferred from the claim text.