Radio reception device for vehicle and noise cancellation method
View Patent ↗A radio reception device for vehicle 100 ( 200 ) includes a variable phase shifter 22 , an amplitude regulator 23 , and an adder 24 , and has an arrangement in which a signal of an RF, IF, or baseband stage of a radio receiver mixed with a noise is added to a phase-inverted component of the noise to remove only the noise. Therefore, sound distortion due to loss of sound information does not occur so that a quality sound can be provided.
1. A radio reception device for vehicle connected to an antenna, comprising:
an oscillator;
a first mixer that outputs a signal generated by mixing an output signal from the oscillator with a broadcast signal received by the antenna;
an internal line on which a noise is intruding;
a filter that is electrically connected to the internal line by a signal line and extracts the noise intruding on the internal line through the electrical connection;
a second mixer that outputs a signal generated by mixing the noise extracted by the filter with the output signal from the oscillator;
a variable phase shifter that outputs a signal generated by inverting a phase of the signal output from the second mixer by 180 degrees;
an amplitude regulator that outputs a signal generated by regulating an amplitude of the signal output from the variable phase shifter; and
an adder that outputs a signal generated by adding the signal output from the amplitude regulator to the signal from the first mixer.
2. The radio reception device according to claim 1 , wherein the internal line is a power line.
3. The radio reception device according to the claim 1 , wherein the first mixer outputs a baseband signal or an IF signal generated by mixing an output signal from the oscillator with a broadcast signal received by the antenna, and the second mixer outputs a baseband signal or an IF signal generated by mixing the noise extracted by the filter with the output signal from the oscillator.
4. A radio reception device for vehicle connected to an antenna, comprising:
an internal line on which a noise is intruding;
a filter that is electrically connected to the internal line by a signal line and extracts the noise intruding on the internal line through the electrical connection;
a variable phase shifter that outputs a signal generated by inverting a phase of the noise extracted by the filter by 180 degrees;
an amplitude regulator that outputs a signal generated by regulating an amplitude of the noise output from the variable phase shifter; and
an adder that outputs a signal generated by adding a broadcast signal received by an antenna to the signal output from the amplitude regulator.
5. The radio reception device according to claim 4 , wherein the internal line is a power line.
6. A noise cancellation method applied to a radio reception device for vehicle connected to an antenna, comprising:
outputting, by a first mixer, a signal generated by mixing an output signal from an oscillator with a broadcast signal received by the antenna;
extracting, by a filter, a noise intruding on an internal line on the device through an electrical connection between the filter and the internal line;
outputting, by a second mixer, a signal generated by mixing the noise extracted by the filter with the output signal from the oscillator;
outputting, by a variable phase shifter, a signal generated by inverting a phase of the signal output from the second mixer by 180 degrees;
outputting, by an amplitude regulator, a signal generated by regulating an amplitude of the signal output from the variable phase shifter; and
outputting, by an adder, a signal generated by adding the signal output from the amplitude regulator to the signal from the first mixer.
7. The noise cancellation method according to claim 6 , wherein the internal line is a power line.
8. The noise cancellation method according to the claim 6 , wherein the first mixer outputs a baseband signal or an IF signal generated by mixing an output signal from the oscillator with a broadcast signal received by the antenna, and the second mixer outputs a baseband signal or an IF signal generated by mixing the noise extracted by the filter with the output signal from the oscillator.
9. A noise cancellation method applied to a radio reception device for vehicle connected to an antenna, comprising:
extracting, by a filter, a noise intruding on an internal line on the device through an electrical connection between the filter and the internal line;
outputting, by a variable phase shifter, a signal generated by inverting a phase of the noise extracted by the filter by 180 degrees;
outputting, by an amplitude regulator, a signal generated by regulating an amplitude of the noise output from the variable phase shifter; and
outputting, by an adder, a signal generated by adding a broadcast signal received by the antenna to the signal output from the amplitude regulator.
10. The noise cancellation method according to claim 9 , wherein the internal line is a power line.