Abstract: An electrolysis cell for chlor-alkali electrolysis, including an anode chamber for accommodating an anode and for accommodating an electrolytic solution, wherein the anode chamber includes a circulation structure for improving circulation of the electrolytic solution and at least one baffle plate for improving horizontal homogeneity of the electrolytic solution.

Abstract: A high-frequency module includes: a mixer circuit performing frequency conversion by mixing a local oscillation signal with a reception signal; a filter circuit eliminating an unnecessary frequency component from the signal outputted from the mixer circuit; a controllable-gain amplifier circuit amplifying and outputting the signal outputted from the filter circuit; and an impedance circuit (such as a resistive element, inductance element, or a chip bead) interposed between the output terminal of the amplifier circuit and the input terminal of a demodulation circuit in the succeeding stage so as to apparently increase the input impedance of the demodulation circuit.

Abstract: A tuner circuit according to the invention includes two AGC control units supplying AGC voltages V1 and V2 to an AGC amplifier, respectively. When the AGC voltage V1 is higher the AGC voltage V2, a voltage on a cathode of a diode becomes high, and the diode 11 is turned off. When the AGC voltage V2 is higher than the AGC voltage V1, a voltage on an anode of the diode becomes high, and the diode 11 is tuned on. Therefore, in the case of an ordinary signal level, the AGC voltages establish a relationship of, and the AGC voltage V2 performs the control. When an excessively large disturbing signal is input, the AGC control unit controls the AGC amplifier to suppress deterioration of performance.

Abstract: A high-frequency signal processing module has: a module base having a recess and a first connection terminal connectable to an external circuit board arranged on the open side of the recess; and a high-frequency signal processing circuit processing a high-frequency signal. The high-frequency signal processing circuit has a second connection terminal connectable to the external circuit board arranged on the open side of the recess of the module base, and is housed inside the recess of the module base. In this high-frequency signal processing module, the signal path along which a high-frequency signal fed through the external circuit board is received by the high-frequency signal processing circuit is short, contributing to a reduced parasitic inductive component.

Abstract: A comparison circuit 13x compares signals from demodulator circuits 11a and 11b and thereby compares the reception condition of the antennas 1a and 1b. The tuner circuit corresponding to the antenna that is yielding better reception condition selects the channel to be displayed on a main screen, and the tuner circuit corresponding to the other antenna selects the channel to be displayed on a sub screen.

Abstract: An audio demodulating circuit in accordance with the present invention for demodulating audio signals in a plurality of broadcast systems of mutually different frequency deviations such as the NTSC and the PAL, is arranged such that a connection between a trap circuit for suppressing adjacent interference and an intermediate frequency signal line can be controlled without using an externally applied special signal, based on a control voltage applied from a phase comparator with respect to a voltage control oscillator which generates a local oscillation signal for extracting an audio signal from the intermediate frequency signal.

Abstract: A digital tuner of the invention has: a filter section that selects a desired reception signal from inputted reception signals; a converter section that performs frequency conversion on the desired reception signal selected by the filter section; a level monitor section that monitors, with respect to a signal based on the signal outputted from the filter section, the signal levels thereof at two or more frequencies within the reception band; and a waveform shaper section that varies the waveform inclination of signals based on the inputted reception signals within the reception band according to the results of monitoring by the level monitor section. This configuration helps reduce the waveform inclination of the output signal.

Abstract: Example burst signal sampling circuitry including synchronous separator circuit(s), waveshaping circuit(s), bandpass amplifier circuit(s), and burst separator circuit(s) is provided in order to extract burst signal(s) from video signal(s) output from video amplifier circuit(s). Level converting circuitry ACC detector/amplifier circuit(s) is provided in order to convert fluctuation in the burst signal(s) to DC voltage(s). This DC voltage(s) is fed back by way of intervening control circuit(s) to the cathode side(s) of input tuning variable capacitance diode(s) constituting frequency characteristics correction circuit(s) of input tuning circuit(s).

Abstract: An electronic tuner of the present invention is arranged such that between an input part of the amplifying circuit and the ground serially connected are a coil and a diode, and a capacitor is connected between the ground and a connecting part between the coil and the diode. The diode is brought into conduction when a voltage supplied from a VHF High control source is at High level, and the coil and input capacitance of the amplifying circuit makes up a gain correction circuit for improving a frequency characteristic of a received signal in a VHF High band. The diode is brought out of conduction when a voltage supplied from a VHF High control source is at Low level, and the coil and the capacitor makes up a trap circuit for improving a frequency characteristic of a received signal in a VHF Low band. This makes it possible to minimize price increase of the apparatus and to improve frequency characteristics in the VHF High band and VHF Low band.

Abstract: A tuner circuit according to the invention includes two AGC control units supplying AGC voltages V1 and V2 to an AGC amplifier, respectively. When the AGC voltage V1 is higher the AGC voltage V2, a voltage on a cathode of a diode becomes high, and the diode 11 is turned off. When the AGC voltage V2 is higher than the AGC voltage V1, a voltage on an anode of the diode becomes high, and the diode 11 is tuned on. Therefore, in the case of an ordinary signal level, the AGC voltages establish a relationship of, and the AGC voltage V2 performs the control. When an excessively large disturbing signal is input, the AGC control unit controls the AGC amplifier to suppress deterioration of performance.

Abstract: A comparison circuit 13x compares signals from demodulator circuits 11a and 11b and thereby compares the reception condition of the antennas 1a and 1b. The tuner circuit corresponding to the antenna that is yielding better reception condition selects the channel to be displayed on a main screen, and the tuner circuit corresponding to the other antenna selects the channel to be displayed on a sub screen.

Abstract: A diversity reception tuner of the invention has one first tuner and at least one tuner. The first tuner has a first PLL circuit and a first voltage-controlled oscillation circuit controlled by a tuning voltage generated by the first PLL circuit, and performs frequency conversion on a desired reception signal by using a local oscillation signal outputted from the first voltage-controlled oscillation circuit. The tuner performs frequency conversion on the desired reception signal by using the local oscillation signal outputted from the first voltage-controlled oscillation circuit. With this configuration, an inexpensive diversity reception tuner is realized that can always use the reception signal from whichever antenna offers optimum reception at the moment.

Abstract: A digital tuner of the invention has: a filter section that selects a desired reception signal from inputted reception signals; a converter section that performs frequency conversion on the desired reception signal selected by the filter section; a level monitor section that monitors, with respect to a signal based on the signal outputted from the filter section, the signal levels thereof at two or more frequencies within the reception band; and a waveform shaper section that varies the waveform inclination of signals based on the inputted reception signals within the reception band according to the results of monitoring by the level monitor section. This configuration helps reduce the waveform inclination of the output signal.

Abstract: An electronic tuner of the present invention is arranged such that between an input part of the amplifying circuit and the ground serially connected are a coil and a diode, and a capacitor is connected between the ground and a connecting part between the coil and the diode. The diode is brought into conduction when a voltage supplied from a VHF High control source is at High level, and the coil and input capacitance of the amplifying circuit makes up a gain correction circuit for improving a frequency characteristic of a received signal in a VHF High band. The diode is brought out of conduction when a voltage supplied from a VHF High control source is at Low level, and the coil and the capacitor makes up a trap circuit for improving a frequency characteristic of a received signal in a VHF Low band. This makes it possible to minimize price increase of the apparatus and to improve frequency characteristics in the VHF High band and VHF Low band.

Abstract: An audio demodulating circuit in accordance with the present invention for demodulating audio signals in a plurality of broadcast systems of mutually different frequency deviations such as the NTSC and the PAL, is arranged such that a connection between a trap circuit for suppressing adjacent interference and an intermediate frequency signal line can be controlled without using an externally applied special signal, based on a control voltage applied from a phase comparator with respect to a voltage control oscillator which generates a local oscillation signal for extracting an audio signal from the intermediate frequency signal.

Abstract: Burst signal sampling means comprising synchronous separator circuit(s) 31, waveshaping circuit(s) 32, bandpass amplifier circuit(s) 33, and burst separator circuit(s) 34 is or are provided in order to extract burst signal(s) from video signal(s) output from video amplifier circuit(s) 24; level converting means comprising ACC detector/amplifier circuit(s) 35 is or are moreover provided in order to convert fluctuation in burst signal(s) to DC voltage(s); and such DC voltage(s) is or are fed back by way of intervening control circuit(s) 36 to the cathode side(s) of input tuning variable capacitance diode(s) constituting frequency characteristics correction circuit(s) of input tuning circuit(s) 11.