Telephone signal cancellation circuit, digital broadcasting reception circuit and portable digital broadcasting reception apparatus
First Claim
Patent Images
1. A telephone signal cancellation circuit, comprising:
- a signal coupler for separating a part of a reception signal;
a telephone signal selection filter for passing a telephone signal among signals in the part of the reception signal from the signal coupler;
a phase shifter for performing phase inversion on the telephone signal from the telephone signal selection filter; and
a combiner for combining the telephone signal from the phase shifter with the reception signal, and canceling the telephone signal included in the reception signal.
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Abstract
A telephone signal cancellation circuit, a digital broadcasting reception circuit and a portable digital broadcasting reception apparatus is provided. The telephone signal cancellation circuit, includes a signal coupler for separating a part of a reception signal, a telephone signal selection filter for passing a telephone signal among signals from the signal coupler, a phase shifter for performing phase inversion on the telephone signal among the signals from the telephone signal selection filter, and a combiner for combining the signal from the phase shifter and the reception signal, and canceling the telephone signal included in the reception signal.
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Citations
28 Claims
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1. A telephone signal cancellation circuit, comprising:
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a signal coupler for separating a part of a reception signal; a telephone signal selection filter for passing a telephone signal among signals in the part of the reception signal from the signal coupler; a phase shifter for performing phase inversion on the telephone signal from the telephone signal selection filter; and a combiner for combining the telephone signal from the phase shifter with the reception signal, and canceling the telephone signal included in the reception signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A digital broadcasting reception circuit, comprising:
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a band-pass filter for passing a digital broadcasting signal as a reception signal; a signal coupler for separating a part of the reception signal; a telephone signal selection filter for passing a telephone signal among signals in the part of the reception signal from the signal coupler; a phase shifter for performing phase inversion on the telephone signal from the telephone signal selection filter; a combiner for combining the telephone signal from the phase shifter with the reception signal from the band-pass filter and canceling the telephone signal included in the reception signal; and a Radio Frequency (RF) processor for receiving the digital broadcasting signal from the combiner. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A portable digital broadcasting reception apparatus, comprising:
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a main control unit for controlling a telephone call and digital broadcasting reception; a telephone circuit for transmitting/receiving a telephone signal through a first antenna by control of the controller; and a telephone signal cancellation circuit for receiving a digital broadcasting signal through a second antenna by control of the controller, performing phase inversion on the telephone signal included in a reception signal flowing through the second antenna, combining the phase-inverted telephone signal with the reception signal flowing through the second antenna, and canceling the telephone signal included in the reception signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification