Carrier squelch processing system and apparatus
AssigneeMotorola, Inc.
InventorJing Fang
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Abstract
Carrier squelch decisions are made by performing the steps of receiving an input signal (D), free of DC offset, having desired and undesired signal components, extracting the desired signal components (M) from the input signal, weighting a function of the input signal (D) by a function of the desired signal (M) to produce a weighted signal (W), determining a characteristic of the weighted signal (W), and performing carrier squelch when the characteristic exceeds a threshold.
Claims32
A method for performing carrier squelch, comprising the steps of:
- receiving an input signal (D), free of DC offset, having desired and undesired signal components;
- extracting the desired signal components (M) from the input signal;
- weighting a function of the input signal (D) by a function of the desired signal (M) to produce a weighted signal (W);
- determining a characteristic of the weighted signal (W) which corresponds to carrier strength;
- and
- performing carrier squelch when the characteristic exceeds a predetermined threshold.
A method for performing carrier squelch comprising the steps of:
- receiving an input signal having desired and undesired signal components;
- extracting the desired signal components (M) from the input signal;
- removing DC offset components from the input signal to generate a signal (D), free of DC offset;
- weighting a function of the signal (D) by a function of the signal (M) to produce a weighted signal (W);
- determining a characteristic of the weighted signal (W) which corresponds to carrier strength;
- and
- performing carrier squelch when the characteristic exceeds a predetermined threshold.
A method for performing carrier squelch comprising the steps of:
- receiving an input signal having desired and undesired signal components;
- extracting the desired signal components (M) from the input signal;
- removing DC offset components from the input signal to generate a signal, (D), free of DC offset;
- determining a characteristic of the signal (D);
- weighting a function of the characteristic by a function of the signal (M) to produce a weighted signal (W);
- and
- performing carrier squelch when the weighted characteristic exceeds a predetermined threshold.
A carrier squelch circuit for a radio, comprising:
- a DC offset eliminator for receiving a discriminator output signal and generating a signal (D) free of DC offset;
- a message signal extractor for receiving the discriminator output signal and extracting a message signal (M);
- a waveform weighting unit for weighting a function of the signal (D) by a function of the message signal (M) to produce a weighted signal (W);
- a characteristic extractor for determining a characteristic of the weighted signal (W) corresponding to carrier strength and a means for performing carrier squelch when the characteristic exceeds a predetermined threshold.
Dependencies are inferred from the claim text.