Facsimile and radio teletype broadcast signal decoder
OwnerScott Stewart, Edwin W. Elorantainventors
Life of this patent
Estimating the term…
Abstract
A method and apparatus are provided for decoding both radio facsimile and radio teletype broadcast signals. A zero crossing detector detects zero crossings of the broadcast signal and generates a pulse with each zero crossing. A time interval is determined between the detected zero crossings. The determined time interval is compared with a plurality of predetermined threshold values for generating a first decoded signal. The first decoded signal is utilized for generating a print signal. The print signal is applied to a conventional printer for generating both the facsimile chart and teletype message.
Claims20
Apparatus for decoding a broadcast signal comprising:
- zero crossing detector means for detecting zero crossings of the broadcast signal;
- means responsive to said zero crossing detector means for determining a time interval between said detected zero crossings;
- comparator means for comparing said determined time interval with a plurality of predetermined threshold values for generating a first decoded signal;
- and
- means for processing said generated first decoded signal and for generating a PRINT signal.
Apparatus for decoding a broadcast signal comprising:
- memory means for storing a program;
- a microprocessor for performing said stored program;
- zero crossing detector means for detecting zero crossings of the broadcast signal;
- said microprocessor being responsive to said zero crossing detector means for determining a time interval between said detected zero crossings;
- said microprocessor being operative for comparing said determined time interval with a plurality of predetermined threshold values for generating a first decoded signal;
- and
- said microprocessor being operative for processing said generated first decoded signal and for generating a PRINT signal.
A method for decoding a broadcast signal comprising the steps of:
- detecting zero crossings of the broadcast signal;
- determining a time interval between said detected zero crossings;
- comparing said determined time interval with a plurality of predetermined threshold values and generating a first decoded signal;
- and
- processing said generated first decoded signal and generating a PRINT signal.
Dependencies are inferred from the claim text.