Abstract: Provided is a portable information terminal, which has a function of receiving digital broadcasting. Information on a Doppler frequency is estimated based on a received wave, and a moving speed is estimated based on the estimated information on the Doppler frequency, thereby determining a parameter of an FIT window in accordance with the estimated moving speed.

Abstract: A portable wireless terminal and a moving velocity detecting method for the portable wireless terminal capable of detecting a moving velocity with high accuracy without increasing power consumption and terminal cost are provided. At the start of a communication, GPS reception-related circuits 32 and 33 are turned on, an initial position of a portable wireless terminal 10 is detected, a RAKE receiver 24 and a synchronous detector 25 measure Doppler shift amounts of down signals at a known frequency received from a plurality of base stations, respectively, and a CPU 41 calculates relative velocities of the portable wireless terminal 10 to the respective base stations and obtains a current moving velocity of the portable wireless terminal 10 from positions of the base stations, the initial position, and the relative velocities.

Abstract: Disclosed are an apparatus and a method for the adjustment time for IQ offset of a quadrature modulator of a transmission circuit. In adjusting the I-offset and the Q-offset of a quadrature modulator, supplied with an I-signal and a Q-signal output from an analog baseband unit to modulate a carrier. Set-up values of the I-offset and the Q-offset, associated with at least three different points on an IQ offset correction plane having an I-component and a Q-component as X- and Y-coordinates, are set for the analog baseband unit at respective different set-up timings. The values of the carrier leak level, associated with three-point offset set-up values of the output signal of the quadrature modulator, are acquired by a sole measurement operation.

Abstract: A portable wireless terminal and a moving velocity detecting method for the portable wireless terminal capable of detecting a moving velocity with high accuracy without increasing power consumption and terminal cost are provided. At the start of a communication, GPS reception-related circuits 32 and 33 are turned on, an initial position of a portable wireless terminal 10 is detected, a RAKE receiver 24 and a synchronous detector 25 measure Doppler shift amounts of down signals at a known frequency received from a plurality of base stations, respectively, and a CPU 41 calculates relative velocities of the portable wireless terminal 10 to the respective base stations and obtains a current moving velocity of the portable wireless terminal 10 from positions of the base stations, the initial position, and the relative velocities.

Abstract: A portable cellular phone system with an automatic answering telephone function can perform data communication and has automatic answering telephone functions installed on both the network side and a terminal unit side. This system includes a section for transferring a message recorded first by the automatic answering telephone function on the network side to the terminal unit side.

Abstract: Disclosed are an apparatus and a method for the adjustment time for IQ offset of a quadrature modulator of a transmission circuit. In adjusting the I-offset and the Q-offset of a quadrature modulator, supplied with an I-signal and a Q-signal output from an analog baseband unit to modulate a carrier. Set-up values of the I-offset and the Q-offset, associated with at least three different points on an IQ offset correction plane having an I-component and a Q-component as X- and Y-coordinates, are set for the analog baseband unit at respective different set-up timings. The values of the carrier leak level, associated with three-point offset set-up values of the output signal of the quadrature modulator, are acquired by a sole measurement operation.

Abstract: An electronic apparatus with backlit display and input device allowing reduced power consumption while maintaining necessary brightness is disclosed. A mode detecting section detects a currently set operation mode when performing a function. The brightness of the backlighting is controlled depending on the currently set operation mode. In the case of a data input mode, the brightness of the backlighting is reduced.

Abstract: A digital signal processor (DSP) control apparatus includes a DSP, estimation unit, calculation unit, and clock generator. The DSP performs digital signal arithmetic processing using a clock having a variable frequency. The estimation unit estimates an arithmetic processing amount of the DSP. The calculation unit calculates a new clock frequency on the basis of an estimated arithmetic processing amount from the estimation unit. The clock generator supplies a clock having a frequency calculated by the calculation unit to the DSP.

Abstract: A portable cellular phone system with an automatic answering telephone function can perform data communication and has automatic answering telephone functions installed on both the network side and a terminal unit side. This system includes a section for transferring a message recorded first by the automatic answering telephone function on the network side to the terminal unit side.

Abstract: An impedance-matching method for matching impedances of first and second circuits at two or more frequencies by using an impedance-matching circuit including reactance elements is provided, which makes it possible to set the impedance of two circuits to be connected at an optimum value or values at the frequencies. In the first step, reactance circuits equivalent to the individual reactance elements of the impedance-matching circuit are configured. Each of the reactance circuits comprises reactance elements and has a frequency characteristic giving desired reactance values at the two or more frequencies. In the second step, reactance values of the reactance elements forming each of the reactance circuits configured in the first step are calculated.

Abstract: An electronic apparatus with backlit display and input device allowing reduced power consumption while maintaining necessary brightness is disclosed. A mode detecting section detects a currently set operation mode when performing a function. The brightness of the backlighting is controlled depending on the currently set operation mode. In the case of a data input mode, the brightness of the backlighting is reduced.

Abstract: A received input signal 10 is received by a reception circuit 20 and a modulator 21, and demodulated data 12 and a reception level signal 16 are obtained. A modulator 23 reconstitutes a modulated wave 13 from the demodulated data 12, and an amplitude detector 21 detects the amplitude of the modulated wave, thus taking out amplitude level variations of the received wave due to modulation components. An analog subtractor 27 cancels the amplitude level variation component with respect to the reception level signal of the received wave. With the cancellation of the amplitude level variations of the received wave due to modulation components, it is possible to follow up quick amplitude level variation of the received wave.

Abstract: In an automatic frequency control device for tuning the frequency of an intermediate frequency (IF) signal to a desired or target frequency, a frequency mixer subtracts the frequency of a received signal coming in through an antenna from the frequency of a local oscillation signal output from a voltage controlled oscillator. A reference oscillator outputs a reference oscillation signal on the basis of a control voltage from a digital/analog converter. The local oscillation signal from the voltage controlled oscillator is synchronous in phase to the reference oscillation signal. A frequency measurement circuit measures the frequency of the IF signal. A subtracter subtracts the frequency of the IF signal from the target frequency and thereby produces a frequency error.

Abstract: A frequency control circuit for a receiver of phase shift keying (PSK) modulated signals comprises intermediate frequency (IF) signal generation circuit for generating an IF signal from a local oscillation signal. A measurement circuit measures the frequency of the IF signal. A detection circuit detects the frequency shift due to the PSK modulation to output a frequency shift signal in response to a first control signal. A control circuit detects that the frequency of the IF signal is converged until the detection circuit can detect the frequency shift due to the PSK modulation.