Abstract: A radio communication apparatus includes first and second storage sections, a receiving section, a speech recognizing section and a control section. The receiving section receives a speech data transmitted from a counter apparatus, and the speech data includes a telephone number. The control section stores at least a part of the received speech data in a location of the first storage section, extracts the telephone number from the received speech data using the speech recognizing section, and stores the extracted telephone number in the second storage section in association with the predetermined location.

Abstract: There is provided a portable telephone fitted with an automatic response function and having a function of judging a speech guidance received from a service center by using a such recognition process to automatically respond to the speech guidance and to set and register intended information to the service center in setting the additional service from the portable telephone to the service center.

Abstract: An amplifier circuit for an electret condenser microphone includes an operational amplifier, an operational amplifier, a bias circuit, and a power supply circuit. The operational amplifier has an inverting input terminal for receiving an output of a two-wire lead electret condenser microphone and a noninverting input terminal for receiving a bias voltage. The bias circuit divides a power supply voltage to generate the bias voltage. The power supply circuit applies the power supply voltage to the electret condenser microphone through the bias circuit and a first resistor.

Abstract: In a number assignment module setting system for a portable telephone set, a portable telephone set inputs number assignment module in a number assignment module setting mode. A number assignment module setting adapter is connected to the telephone set to set the telephone set in the number assignment module setting mode. In the portable telephone set, a detecting section detects connection of the adapter. A first data supply section supplies first data to the adapter in response to a predetermined first key input when connection of the adapter is detected. An analyzing section receives second data formed by the adapter on the basis of the first data, and performs analysis to check whether the first data can be calculated back from the second data. A mode setting section sets the number assignment module setting mode in response to a predetermined second key input when an output from the analyzing section indicates that the first data can be calculated back from the second data.

Abstract: A white noise suppressing circuit for suppressing white noise contained in a received voice of a speaker telephone apparatus includes a filter for suppressing white noise contained in an aural input signal input to an aural signal line, a switch for short-circuiting the filter, a detecting circuit for detecting the aural input signal, and a comparator for comparing an output of the detecting circuit with a preset voltage and for controlling the switch on the basis of the results of the comparison. When it is determined by the comparator that there is a voice input, the switch is short-circuited to make the filter inoperable. When there is no voice input, the switch is opened so as to make the filter operate.