Pioneer Electronic Corporation

Masami Takayama

Toshihito Ichikawa

Eizi Ueno

A receiver has a plurality of receiving systems connected to a plurality of antennas, respectively, and a selective switching circuit for carrying out selective switching between output signals from the plurality of receiving systems to output an output signal from a receiving system in the most satisfactory receiving state, wherein the selective switching circuit has a fuzzy inference operation unit for discriminating receiving states of respective receiving states by a fuzzy inference. Accordingly, it is possible to synthetically judge the receiving state of the receiver to easily and stably select the optimum receiving system in the receiver.

Receiver using selective diversity receiving system

A windshield antenna for a vehicle is mounted on a central portion of a window glass of the vehicle. The heating wires serve both as a window defogger element and as an antenna for receiving amplitude-modulated (AM) waves. A pair of first and second antenna elements are disposed on right and left sides of the heating wire, each of the first and second antenna elements serving as an antenna for receiving frequency-modulated (FM) waves. These antenna elements can be the same size, yielding improved diversity reception characteristics.

Window glass antenna for vehicle

A high frequency, negative feedback amplifier is coupled at its input to an inductance network which together with the input capacitance of the negative feedback amplifier forms a resonance circuit. The resonance frequency of the resonance circuit is set within the desired reception band of the amplifier, to thereby form a band pass filter having a pass band corresponding to the desired reception band. The resonance circuit assures only a real input to the amplifier thereby reducing the input noise attributable to the input source.

High frequency amplifier circuit with noise figure improvement

A space diversity system capable of operating accurately over a wide range of received input electric field strengths. With a middle or high received electric field strength, a search operation for the antenna with the highest strength is commenced in response to noise detected in the output of the antenna presently selected. With a low received electric field strength, the search operation is carried out in response to noise such as white noise at all times.

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Saitama, Japan

Masami Takayama