Sony Corporation

Toru Suda

Jun Ono

Kazuhiko Maejima

Yasuhiro Shimizu

A high frequency signal receiving device includes a reference frequency signal generating section operable to generate a reference frequency signal; a high frequency signal processing section operable to obtain a signal of a desired channel from a high frequency signal using the reference frequency signal, the high frequency signal being obtained by receiving a broadcast wave; an analog demodulating section operable to subject the signal of the desired channel to an analog demodulation process; and a digital demodulating section operable to subject the signal of the desired channel to a digital demodulation process using the reference frequency signal.

High frequency signal receiving device

A mixer input circuit for converting a signal from a tuning section of an unbalanced type into a balanced signal and outputting the signal. In the mixer input circuit, an RF signal from an input terminal amplified by an RF amplifier is transmitted to a tuning circuit section employing a distributed constant line. A central conductor of the distributed constant line in the tuning circuit section is electromagnetically combined with a second central conductor, thereby constituting an imbalance-balance conversion section. A middle point of the second central conductor on an output side of the imbalance-balance conversion section is grounded, and a balanced output signal from both ends is transmitted to a mixer, so as to be converted into an IF signal and then to be output from an output terminal. With the present mixer input circuit, imbalance-balance conversion can be carried out without using a transformer, and a reduction in size can be realized due to the absence of deterioration of performance.

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Kanagawa, Japan

Toru Suda