Radio broadcast reciever, automatic tuning device for radio broadcast and method for receiving radio broadcast
First Claim
1. A radio broadcast receiver comprising:
- a frequency conversion circuit for receiving a radio broadcast wave and for outputting a reception signal having an intermediate frequency;
a detection circuit for detecting the reception signal of an analog radio broadcast wave and for outputting a modulation signal as a detection signal in an audio range;
an automatic tuning device for searching a broadcast frequency corresponding to a reception signal level of the reception signal by changing a reception signal frequency of the reception signal, the reception signal level being equal to or larger than a predetermined electric field intensity threshold value; and
a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal corresponding to a noise amount, whereinthe automatic tuning device controls the frequency conversion circuit to output the reception signal, which is converted to have the intermediate frequency from the broadcast frequency, andthe automatic tuning device selects the broadcast frequency when the reception signal level is equal to or larger than the predetermined electric field intensity threshold value and a noise detection signal level of the noise detection signal is equal to or smaller than a predetermined noise determination threshold value.
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Accused Products
Abstract
A radio broadcast receiver includes: a frequency conversion circuit for receiving a radio broadcast wave and for outputting a reception signal; a detection circuit for detecting the reception signal of an analog radio broadcast wave and for outputting a detection signal; an automatic tuning device for searching a broadcast frequency; and a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal. The automatic tuning device selects the broadcast frequency when the reception signal level is equal to or larger than a predetermined electric field intensity threshold value and a noise detection signal level is equal to or smaller than a predetermined noise determination threshold value.
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Citations
15 Claims
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1. A radio broadcast receiver comprising:
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a frequency conversion circuit for receiving a radio broadcast wave and for outputting a reception signal having an intermediate frequency; a detection circuit for detecting the reception signal of an analog radio broadcast wave and for outputting a modulation signal as a detection signal in an audio range; an automatic tuning device for searching a broadcast frequency corresponding to a reception signal level of the reception signal by changing a reception signal frequency of the reception signal, the reception signal level being equal to or larger than a predetermined electric field intensity threshold value; and a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal corresponding to a noise amount, wherein the automatic tuning device controls the frequency conversion circuit to output the reception signal, which is converted to have the intermediate frequency from the broadcast frequency, and the automatic tuning device selects the broadcast frequency when the reception signal level is equal to or larger than the predetermined electric field intensity threshold value and a noise detection signal level of the noise detection signal is equal to or smaller than a predetermined noise determination threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An automatic tuning device for searching a broadcast frequency corresponding to a reception signal level of a reception signal by changing a reception signal frequency of the reception signal, the reception signal level being equal to or larger than a predetermined electric field intensity threshold value, wherein the reception signal is outputted from a radio broadcast receiver having a frequency conversion circuit and a detection circuit, wherein the frequency conversion circuit receives a radio broadcast wave and outputs the reception signal having an intermediate frequency, and wherein the detection circuit detects the reception signal of an analog radio broadcast wave and outputs a modulation signal as a detection signal in an audio range, the device comprising:
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a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal corresponding to a noise amount; and a controller, wherein the controller controls the frequency conversion circuit to output the reception signal, which is converted to have the intermediate frequency from the broadcast frequency, the controller selects the broadcast frequency when the reception signal level is equal to or larger than the predetermined electric field intensity threshold value and a noise detection signal level of the noise detection signal is equal to or smaller than a predetermined noise determination threshold value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for receiving radio broadcast comprising:
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receiving a radio broadcast wave, converting the radio broadcast wave to have an intermediate frequency from a broadcast frequency of the radio broadcast wave, and outputting the converted radio broadcast wave as a reception signal having the intermediate frequency; detecting the reception signal of an analog radio broadcast wave and outputting a modulation signal as a detection signal in an audio range; searching the broadcast frequency corresponding to a reception signal level of the reception signal by changing a reception signal frequency of the reception signal, the reception signal level being equal to or larger than a predetermined electric field intensity threshold value; and amplifying a noise component in the detection signal and outputting a noise detection signal corresponding to a noise amount, wherein the searching includes selecting the broadcast frequency when the reception signal level is equal to or larger than the predetermined electric field intensity threshold value and a noise detection signal level of the noise detection signal is equal to or smaller than a predetermined noise determination threshold value.
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Specification