By-passing adjacent channel interference removal in receivers
First Claim
1. A heterodyne receiver comprising:
- a tuner configured to select a frequency of a received signal;
a converter, coupled to an output of the tuner, for changing the frequency of the received signal to an intermediate frequency;
a single-pole/double throw switch having an input coupled to an output of the converter;
a first band-pass filter coupled to a first output of the single-pole/double throw switch;
an amplifier coupled to a second output of the single-pole/double throw switch and the first band-pass filter;
a second band-pass filter coupled to an output of the amplifier;
a demodulator coupled to an output of the second band-pass filter to produce an output signal and a characteristics signal; and
a logic circuit coupled to receive the characteristics signal and by-passing the first band-pass filter if the characteristics signal is less than a predetermined threshold.
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Accused Products
Abstract
A heterodyne receiver includes a tuner to select a frequency of a received signal and a converter to change the frequency of the received signal to an intermediate frequency. A single-pole/double throw switch has an input coupled to an output of the converter, a first output connected to a first band-pass filter and a second output connected to an amplifier. A second band-pass filter is coupled to an output of the amplifier, and a demodulator is coupled to an output of the second band-pass filter to produce an output signal and a characteristics signal. A logic circuit is coupled to receive the characteristics signal and for by-passing the first band-pass filter if the characteristics signal is less than a predetermined threshold.
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Citations
5 Claims
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1. A heterodyne receiver comprising:
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a tuner configured to select a frequency of a received signal;
a converter, coupled to an output of the tuner, for changing the frequency of the received signal to an intermediate frequency;
a single-pole/double throw switch having an input coupled to an output of the converter;
a first band-pass filter coupled to a first output of the single-pole/double throw switch;
an amplifier coupled to a second output of the single-pole/double throw switch and the first band-pass filter;
a second band-pass filter coupled to an output of the amplifier;
a demodulator coupled to an output of the second band-pass filter to produce an output signal and a characteristics signal; and
a logic circuit coupled to receive the characteristics signal and by-passing the first band-pass filter if the characteristics signal is less than a predetermined threshold. - View Dependent Claims (2, 3, 4)
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5. A method for processing an input signal, comprising:
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receiving the input signal at a selected frequency;
converting the input signal at the selected frequency to an intermediate frequency;
filtering the input signal at the intermediate frequency;
demodulating the filtered input signal to produce an output signal and a characteristics signal; and
by-passing the filtering if the characteristics signal is less than a predetermined threshold.
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Specification