Broadcast receiver and tuning apparatus
View Patent ↗A broadcast receiver includes a processor that processes a broadcasting signal, a detector that detects a level of a signal of a first predetermined band of the broadcasting signal, and an adjuster that adjusts at least one of a characteristic and an operation of the processor based on the detected level.
1. A broadcast receiver comprising;
a filter circuit with an adjustable cutoff frequency and that receives a broadcasting signal;
a detector that detects a level of a signal of a first predetermined band of the broadcasting signal; and
an adjuster that adjusts the cutoff frequency based on the detected level, wherein
when the detected level is less than or equal to a predetermined level, the adjuster adjusts the cutoff frequency to a first cutoff frequency that blocks at least a signal of the first predetermined band.
2. The broadcast receiver according to claim 1 , further comprising:
a frequency converter that is connected to the filter circuit and converts a frequency of a signal of the first predetermined band to a predetermined frequency, wherein
when the detector detects the level of the signal of the first predetermined band to be greater than the predetermined level, the adjuster adjusts the cutoff frequency and causes an amplitude of the converted signal to become greater than a first level at or above a frequency of a second predetermined band.
3. The broadcast receiver according to claim 2 , wherein
the adjuster adjusts the cutoff frequency and causes the amplitude of the converted signal to become greater than an amplitude of the signal of the second predetermined band of when the detector detects the level of the signal of the first predetermined band to be smaller than the predetermined level.
4. The broadcast receiver according to claim 1 , further comprising:
a frequency converter that is connected to the filter circuit and converts a frequency of a selected signal to a predetermined frequency, wherein
when a frequency higher than the first predetermined band by a first frequency is selected and when the detector detects the level of the signal of the first predetermined band to be greater than the predetermined level, the adjuster adjusts the cutoff frequency and causes an amplitude of the converted signal to become greater than a first level at or above the frequency higher than a predetermined intermediate frequency by the first frequency.
5. The broadcast receiver according to claim 4 , wherein
the adjuster adjusts the cutoff frequency and causes the amplitude of the converted signal to become greater than an amplitude of the signal of the predetermined intermediate frequency of when the detector detects the level of the signal of the first predetermined band to be smaller than the predetermined level.
6. The broadcast receiver according to claim 1 , further comprising:
a separator that separates the broadcasting signal into a plurality of output signals, wherein the filter circuit processes a first output signal of the plurality of the output signals.
7. The broadcast receiver according to claim 6 , further comprising:
a band limiter that limits a band in a predetermined band of a second output signal of the plurality of the output signals, wherein
the detector detects a signal level output by the band limiter after the band limiter limits the band, and
the adjuster adjusts the cutoff frequency based on a detection signal output by the detector.
8. The broadcast receiver according to claim 7 , further comprising:
a voltage output controller, wherein
the band limiter and the detector are respectively provided in a plurality, and
the voltage output controller outputs a control signal based on a level corresponding to a combination of the level of each detection signal output by the plurality of detectors.
9. The broadcast receiver according to claim 7 , wherein
the band limiter and the detector are respectively provided in a plurality,
the filter circuit includes a plurality of filters, and
each of the plurality of detectors outputs each detection signal to each of the plurality of the filters included in the filter circuit.
10. The broadcast receiver according to claim 7 , further comprising:
a signal amplifier that is arranged between an output of the band limiter and an input of the detector.
11. The broadcast receiver according to claim 1 , wherein
the broadcast receiver is a high frequency circuit, and
the filter circuit is an RF circuit.
12. A tuning apparatus comprising;
a filter circuit with an adjustable cutoff frequency and that receives a broadcasting signal;
a detector that detects a level of a signal of a first predetermined band of the broadcasting signal; and
an adjuster that adjusts the cutoff frequency based on the detected level, wherein
when the detected level is less than or equal to a predetermined level, the adjuster adjusts the cutoff frequency to a first cutoff frequency that blocks at least a signal of the first predetermined band.