Single voltage controlled oscillator modem
AssigneeHoneywell Inc.
InventorGeorge A. Bowman
Life of this patent
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Abstract
A modem for transmitting data over one frequency and receiving data over another frequency is disclosed having an oscillator for generating a first signal, a voltage controlled oscillator for generating a second signal, a mixer for mixing the first and second signals to provide a mixer output signal having the transmission frequency, an input data switch for modulating the mixer output signal in accordance with input data, a second mixer connected to the voltage controlled oscillator and to the received incoming signal and a receiver for demodulating the received signal data.
Claims20
A modem for transmitting data over a transmitting frequency and receiving data over a receiving frequency, wherein said transmitting frequency and said receiving frequency have different values, said modem comprising:
- a first oscillator for generating a first signal of a first frequency;
- voltage controlled oscillator means having a voltage controlled oscillator for generating a second signal of a second frequency;
- first mixer means connected to said first oscillator and to said voltage controlled oscillator for providing a first mixer output signal having a transmitting third frequency as a combination of said first frequency and said second frequency;
- input data means responsive to input data for modulating said first mixer output signal and for supplying said modulated first mixer output signal to a transmission medium;
- second mixer means connected to said voltage controlled oscillator and said transmission medium for mixing said second signal of said second frequency and said received data having a receiving fourth frequency, wherein said third and fourth frequencies have different values;
- and,
- receiver means connected to said second mixer means for demodulating said received data.
Dependencies are inferred from the claim text.