Abstract: A temperature compensating circuit is provided in a radio unit, an ambient temperature is detected by a temperature sensor of the temperature compensating circuit, the detected temperature value is supplied to a correction address storage section as an address after it is converted to a digital value, and thus a correction address corresponding to a correct temperature value obtained by correcting the detected temperature value is read out. Then, the correction address is supplied to a frequency correction data storage section to read out frequency correction data corresponding to the corrected temperature value, and the frequency correction data is converted to an analog control voltage by a D/A converter and then supplied to a variable capacitance element of a reference oscillator, thereby making it possible to correct the reference oscillation frequency according to the temperature.

Abstract: In a helical antenna for use in a portable communication terminal containing a radio unit which transmits and receives a radio signal, an antenna element is connectable to the radio unit, and contains a bottom portion formed into a helical portion and a top portion formed into a linear portion, the linear portion being positioned along a screw axis of the helical portion. A cap houses the antenna element if the cap covers the antenna element from a top end of the antenna element. A position portion is provided in the cap and positions the linear portion of the antenna element along the screw axis of the helical portion. By virtue of this structure, an appropriate distance can be reliably secured between the antenna element and a human body, thereby maintaining a good characteristic of the antenna.

Abstract: In a helical antenna for use in a portable communication terminal containing a radio unit which transmits and receives a radio signal, an antenna element is connectable to the radio unit, and contains a bottom portion formed into a helical portion and a top portion formed into a linear portion, the linear portion being positioned along a screw axis of the helical portion. A cap houses the antenna element if the cap covers the antenna element from a top end of the antenna element. A position portion is provided in the cap and positions the linear portion of the antenna element along the screw axis of the helical portion. By virtue of this structure, an appropriate distance can be reliably secured between the antenna element and a human body, thereby maintaining a good characteristic of the antenna.

Abstract: In response to a reception of a incoming signal by a receiver during operation of a turner circuit, a controller shifts a changeover switch and at the same time cause a ringing tone generator to output a ringing tone via a loudspeaker in a tuner section, thereby permitting the user listening to a broadcast to surely hear the ringing tone. In response to an operation to a control panel in a reception state of a telephone receiver, the controller causes the tuner circuit to operate and at the same time controlling a power supply switch to stop on-off switching, keeping the switch on to continuously supply electric power to the telephone section. Thus, power supply noise caused by the intermittent supply of power is prevented from affecting the tuner section, thereby checking a deterioration in the quality of broadcast voice.

Abstract: A telephone terminal device in connection with an office line, comprises: (a) an office line acquisition unit for acquiring the office line; (b) an office line acquisition controller responsive to a call signal sent through the office line, for driving the office line acquisition unit by call signal power; and a power supply unit responsive to DC power supplied through the office line acquired by the office line acquisition unit, for supplying the supplied DC power to the telephone terminal device as device driving power. The telephone terminal device utilizes DC power supplied from a telephone exchange office through a telephone line so that built-in backup batteries are consumed at the lowest possible consumption rate.

Abstract: A telephone terminal device equipped with a transmitter microphone, a receiver, a speech recognition unit that receives and recognizes speech signals from the transmitter microphone and a circuit to reduce the level of signals send from a telephone network to the receiver when the speech recognition unit receives speech signals from the transmitter microphone. Further, this device is preferably equipped with a speech reproduction unit that reproduces the speech information stored in a memory, in response to the information of recognition result from the speech recognition unit, and a circuit that prevents transmission of signals from the telephone network to the receiver when the regenerated speech information is sent to the receiver. Furthermore, it is desirable for this device to be provided with a circuit that prevents generation of ringing tones when an incoming call arrives.

Abstract: A cordless telephone system comprising a master set, a slave set, and a charger includes terminals for connecting the slave set and the charger so that communication of speech signals and control signals can be conducted. The charger includes an automatic answering circuit incorporated therein. When the automatic answering circuit receives a control signal indicative of a cell incoming through the terminals from the slave set, this circuit executes an automatic answering service such as a service to reproduce an answering message to transmit the reproduced answering message to the slave set through the terminals thereafter to record a message from a person on the other side of the line transmitted from the slave set through the terminals.

Abstract: There is provided a telephone system including a recording/reproducing section for recording an answering message to be transmitted to a calling subscriber and for reproducing the answering message, wherein a predetermined command from the calling subscriber is received through a telephone line during sending of the reproduced answering message to the telephone line, a predetermined operation is executed in correspondence with the command. In this telephone system, there are provided sections (25, 107) for generating a soundless period discrimination signal indicating a soundless period of the answering message at the time of recording the answering message, and command reception sections (11, 20, 21) for receiving the command signal in response to the soundless period discrimination signal at the time of sending the reproduced answering message to the telephone line.

Abstract: Power supply equipment which comprises a power supply circuit (9) that supplies power to a load, a regulator circuit connected to the power supply circuit that regulates the output voltage of the power supply circuit at a predetermined voltage level, a regulator circuit control means that controls voltage in proportion to the output voltage of the power supply circuit to the regulator circuit, and an overload detection means that detects if the load is in overload condition, so that in response to overload detection by the overload detection means the regulator circuit control means controls the regulator circuit (13) to stop power feed to the load from the power supply circuit.

Abstract: A control system for a plurality of telephone sets connected as branched to a central office line allows extension calling, privacy function setting and hold releasing operations between the telephone sets. Each of the telephone sets in the branched connection comprises keys through which a control data corresponding to a desired control operation is inputted, a transmission circuit for sending to the central office line a control signal corresponding to the control data inputted by the keys, a reception circuit for receiving the control signal from the line, and a control circuit for performing a predetermined control operation on the basis of the control signal received by the reception circuit, whereby the respective operations of the telephone sets are mutually controlled on the basis of the control signal.

Abstract: A tape control system for use in an automatic program locating system for tapeplayers. The tape control system is responsive to blank or unrecorded spaces between recorded programs and includes a presettable shift register having a succession of bit stages for indicating one or more desired programs to be located and reproduced. The contents of the bit stages are shifted to the next successive bit stage upon every occurrence of a space detection signal generated in response to each sensed unrecorded space on the tape. The outputted content of the last bit stage in the succession is provided to an output-content detection circuit which controls tape speed shifting circuits to shift the tape speed into a normal playback speed or into a fast movement speed in response whether the output of the last bit stage indicates that a selected program is to be read next by the heads of the tapeplayer.

Abstract: A recording circuit has a multi-channel recording head, impedance elements provided between one ends of the respective channels of the recording head and a ground circuit, and a bias oscillator for feeding a first bias current to one of the channels and a second bias current to another channel, with the phrases in the z circuits reversed. Since these currents have opposite phases, electromagnetic waves radiated from bias supply paths are cancelled each other.

Abstract: Provided is an information block-number setting device which is suitable to a program-reproducing device designed automatically to select a predetermined information block, such as an automatic music piece-selecting device for use in a tape recorder. The information block-number setting device includes a first setting section having a plurality of setters each capable of independently designating one of consecutive informtion block-numbers and a second setting section having a setter capable of designating a specified information block-number arithmetically added to said one of said consecutive information block-numbers designated by the first setting section.