Abstract: A wireless receiver includes an analog-to-digital converter that converts a signal corresponding to a received signal into a digital signal on the basis of multiple reference voltages and outputs the digital signal. The wireless receiver also includes a control circuit that controls at least one of the multiple reference voltages on the basis of the digital signal that is output from the analog-to-digital converter.

Abstract: A wireless receiver includes an analog-to-digital converter that converts a signal corresponding to a received signal into a digital signal on the basis of multiple reference voltages and outputs the digital signal. The wireless receiver also includes a control circuit that controls at least one of the multiple reference voltages on the basis of the digital signal that is output from the analog-to-digital converter.

Abstract: A bias circuit for an operating transistor has a first resistor disposed in a path for supplying a bias current to a base of the operating transistor, a first transistor for applying the bias current flowing to the first resistor, a second transistor for applying a corresponding current corresponding to the bias current supplied via at least one current mirror circuit, a third transistor having bases connected in common with the first transistor for applying the corresponding current, a second resistor for applying the corresponding current and obtaining a voltage drop corresponding to a voltage drop at the first resistor, and a fourth transistor receiving a reference voltage at an emitter side and having a base connected to an emitter side of the third transistor.

Abstract: A bias circuit for an operating transistor has a first resistor disposed in a path for supplying a bias current to a base of the operating transistor, a first transistor for applying the bias current flowing to the first resistor, a second transistor for applying a corresponding current corresponding to the bias current supplied via at least one current mirror circuit, a third transistor having bases connected in common with the first transistor for applying the corresponding current, a second resistor for applying the corresponding current and obtaining a voltage drop corresponding to a voltage drop at the first resistor, and a fourth transistor receiving a reference voltage at an emitter side and having a base connected to an emitter side of the third transistor.

Abstract: A bass and treble audio tone control circuit configured as an integrated circuit, wherein a capacitor for setting a frequency band can be accommodated in an integrated circuit. A LPF extracts a low sound region component SLO from an initial sound signal SIN. A low sound region adjustment circuit adjusts the gain of SLO and generates signal SLT. An inverting circuit inverts SLO and an adding circuit extracts a high sound region component SHO by adding the inverted SLO and SIN. A high sound region adjustment circuit adjusts the gain of SHO and generates a signal SHT. A synthesizing circuit synthesizes SIN with SHT and SLT, and generates an output sound signal SOUT. The LPF is composed of an RC active filter, and the resistance that establishes the cutoff frequency is composed of an equivalent resistance using a switched capacitor circuit.

Abstract: A capacitor has one end receiving an input signal and the other end outputting an output signal. A resistor circuit, connected between a power source and the other end of the capacitor, functions as a resistor. The resistor circuit includes a PNP transistor having a base connected to the other end of the capacitor and an NPN transistor having a base connected to the other end of the capacitor. A differential amplifier supplies complementary current to the PNP transistor and the NPN transistor. The differential amplifier receives, as negative feedback, the output signal from the other end of the differential amplifier.

Abstract: A bass and treble audio tone control circuit configured as an integrated circuit, wherein a capacitor for setting a frequency band can be accommodated in an integrated circuit. A low sound region component SLO is extracted by an LPF (30) from an initial sound signal SIN. A low sound region adjustment circuit (38) adjusts the gain of SLO and generates a low sound region adjustment signal SLT. Also, SLO is inverted by an inverting circuit (32), and a high sound region component SHO is extracted by adding SLO and SIN in an adding circuit (34). A high sound region adjustment circuit (36) adjusts the gain of SHO and generates a high sound region adjustment signal SHT. A synthesizing circuit (24) synthesizes SIN with SHT and SLT, and generates SOUT, which has undergone boosting or cutting in the high sound region and low sound region. The LPF (30) is composed of an RC active filter, and the resistance that establishes the cutoff frequency is composed of an equivalent resistance using a switched capacitor circuit.

Abstract: A coupling capacitor for converting the DC level between circuits is incorporated into a semiconductor integrated circuit to reduce the number components. A high-pass filter (34) having a cutoff frequency fC is composed of a coupling capacitor C1 that cuts off direct current between circuits (22) and (24), and a switched capacitor circuit (28) constituting an equivalent resistor RSC. If the switching frequency fSC or the capacitance CSC charged and discharged by the switched capacitor circuit (28) is set low, the RSC can be increased and the C1 at the prescribed fC can be reduced proportionately. Accordingly, the high-pass filter (34) having the C1 can be integrated onto the chip of the IC (20).

Abstract: To simplify the structure of a sound signal processing device for automatically switching between generation of pseudo-surround sound and generation of pseudo-stereo sound based on whether an original sound signal is stereo or monaural. A stereo sound decoder for receiving a sound channel signal of a TV receiving signal determines whether or not the sound type is stereo or monaural based on the presence or absence or the like of a control channel signal, and generates L and R signals according to the result of determination to output to an acoustic process circuit. The result of determination concerning the sound type, which is obtained by the stereo sound decoder is transmitted via a bus to the acoustic process circuit to be utilized in control of the automatic switching by the acoustic process circuit. This can eliminate the need to provide a separate sound type determination circuit.