Abstract: A terminal according to the present invention is characterized in that it comprises: a vibrator which notifies the existence of an incoming call with its vibration; a measurement device which measures magnitude of the vibration applied to the terminal from the outside, when an incoming call is detected; and a controller which judges, on the basis of the measured vibration magnitude, whether or not the user can notice the vibration generated by the vibrator, and enables the vibrator to generate vibration when the judgment result is that the user can notice the vibration.

Abstract: A wireless communication apparatus prevents desensitization in a line signal frequency caused by clock signal harmonic. The wireless communication apparatus is provided with a receiver/demodulator for receiving a line signal of a predetermined frequency and for demodulating the line signal, a control section decoding the demodulated line signal using an operation clock signal, and a clock signal generating circuit supplying a clock signal. The control section controls the clock signal generating circuit to change a frequency of the clock signal in response to the line signal frequency, therefore, harmonic of the clock signal do not enter into a desensitization range corresponding to the line signal frequency.

Abstract: A radio selective-calling receiver, which avoids the influence of the noise and the deterioration of the characteristic of a radio section generated at the time when a received calling is informed to a user, and avoids the increase of cost and the large sized apparatus, is provided. At the time when the radio section is on state, a vibrator is separated from a power supply and the operation noise of the vibrator is not transmitted to the line of the power supply and the voltage drop of the power supply by the current of the vibrator is not also generated.

Abstract: A wireless selective call receiving apparatus includes a mixer section, a detecting section and a control section. The mixer section converts a frequency of a received signal. The detecting section detects a carrier frequency when the received signal is received. The control section controls a current sent to the mixer section based on a result detected by the detecting section.

Abstract: A radio selective-calling receiver which is capable of supplying sufficient power to a controller to provide stable operation of the controller. The operation/non-operation of a DC/DC converter is controlled by a battery saving operation timing control signal BS outputted from the controller to decide the operation timing of a radio section. At the time when the radio section does not operate, the power supplied from a primary battery is converted from DC to DC at a DC/DC converter and is supplied to the controller and also charges a secondary battery. With this structure, the sufficient power supply to the controller by the secondary battery is obtained. The output voltage of the secondary battery is detected and at the time when the output voltage of the secondary battery detected becomes below a fixed voltage value, the interruption from an operating section to the controller is interdicted.

Abstract: A portable information terminal device with a radio selective-calling receiver including first and second receiver sections with first and second antennas, respectively, implements an improvement of the reception sensitivity deterioration caused by the noise of a personal computer attached to the device with any increase of the dissipation current generated by the receiver maintained at a minimum. Only when the portable information terminal device is connected to the personal computer will it operate in a diversity reception mode to implement both receiving sections, improving reception sensitivity deterioration. When the portable information terminal device is not connected to the personal computer, diversity reception is not implemented, thus permitting only one of the receiving sections to receive.

Abstract: A high-gain amplifier circuit that can start normal operation quickly after a power supply is turned on. This circuit includes first to n-th differential amplifiers cascade-connected at first to n-th stages, a first input terminal to which a first input signal is applied, a second input terminal to which a second input signal is applied; a first output terminal from which a first output signal is derived, a second output terminal from which a second output signal is derived, and a voltage/current converter applied with the first and second output signals and producing an output current corresponding to an offset between bias components of the first and second output signals. The output current of the voltage/current converter is fed back to the first differential amplifier at the first stage, thereby canceling the offset between the bias components of the first and second output signals.