Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1986-10-21
1988-10-11
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455265, 331 4, H03L 700
Patent
active
047776587
ABSTRACT:
A receiver and transmitter are provided for a distress incident locating telecommunications system. The receiver is a superheterodyne AM receiver which applies the received distress transmissions to a normally unlocked phaselock loop which locks onto the unmodulated carrier signal portion of the distress transmission. The duration of the phaselock loop being locked, and unlocked immediately after being locked, are measured and compared to predetermined values to find a match. Each of the predetermined values corresponds to an item of information, and if a match is found, the receiver indicates it. The receiver is also capable of extracting audio information present in the distress transmission. The transmitter generates three signals which can be applied to a transmitting antenna. These signals are a radio frequency carrier signal, and a carrier signal modulated by a distress waveform or by an audio signal. The signal which is ultimately applied to the transmitting antenna will have four parameters where each set of parameters corresponds to a different item of information. The parameters are which one or more of the three signals will be applied to the antenna, the sequence of application of the signals to the antenna, the duration of each of the signals, and the frequency of the audio signal.
REFERENCES:
patent: 4000476 (1976-12-01), Walker et al.
patent: 4213096 (1980-07-01), Daniel Jr.
patent: 4232189 (1980-11-01), Leitch
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patent: 4451930 (1984-05-01), Chapman et al.
patent: 4513448 (1985-04-01), Maher
patent: 4523157 (1985-06-01), Sato
patent: 4607393 (1986-08-01), Nolde et al.
patent: 4696056 (1987-09-01), Morita
Griffin Robert L.
Kuntz Curtis
Lupuloff Harry
Manning John R.
Marchant R. Dennis
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