Abstract: A private network system including mobile radio telephones is able to originate connection and terminate connection even when any of the mobile radio telephones are moved from one exchange where the position of the mobile radio telephone is registered to another exchange. In the private network system which comprises a plurality of exchanges for switching telephones, each of the exchanges includes one or more radio connection controllers for radio communicating with mobile radio telephones, and a plurality of mobile radio telephones connected through the radio connection controller to the exchange for switching, the radio connection controller has an area in which the controller can communicate with the mobile radio telephones.

Abstract: In a radio telephone system and a call charging method used in this radio telephone system, when a user of a radio telephone issues a telephone call to a public telephone network by utilizing a radio controller installed in a PBX employed on the premises of a company to which the telephone user does not belong, the PBX reports both of terminal number information of the radio telephone and call account information for charging the call account to the terminal to the public telephone network, in case that a telephone call is demanded. When the information is received, the public telephone network charges the call account to the radio telephone. If the information is not transmitted from the PBX to the public telephone network, the call account is charged to the call originating line of the PBX.

Abstract: A private network system including mobile radio telephones is able to originate connection and terminate connection even when any of the mobile radio telephones are moved from one exchange where the position of the mobile radio telephone is registered to another exchange. In the private network system which comprises a plurality of exchanges for switching telephones, each of the exchanges includes one or more radio connection controllers for radio communicating with mobile radio telephones, and a plurality of mobile radio telephones connected through the radio connection controller to the exchange for switching, the radio connection controller has an area in which the controller can communicate with the mobile radio telephones.

Abstract: In a radio telephone system and a call charging method used in the radio telephone system, when a user of a radio telephone issues a telephone call to a public telephone network by utilizing a radio controller installed in a PBX employed on the premises of a company to which the telephone user does not belong, the PBX reports both terminal number information of the radio telephone and call account information for charging the call account to the terminal to the public telephone network. When the information is received, the public telephone network charges the call account to the radio telephone. If the information is not transmitted from the PBX to the public telephone network, the call account is charged to the call originating line of the PBX.

Abstract: A mobile station, operable in a mobil communication system that executes a location registration processing by using the channel quality of a base station and an information concerning a base station the mobile station includes a base station information memory unit for storing therein information concerning a plurality of base stations and an amount in which the channel quality of the base station is changed with time and a location judging unit for judging on the basis of the amount in which the base station information is changed with time and which is stored in the base station information memory unit whether or not location registration processing is to be executed indicating a location in service area.

Abstract: An intermittenceless switching system includes two speech path memories having sufficient capacity to store a single frame of data having a plurality of time slots. The incoming data is stored in one memory, while the outgoing data is read from the other memory. A control circuit continuously alternates the read/write functions between the two memories. A control memory is used to store switch control information. The system includes a buffer memory that is present between a data processor and the control memory to prevent switch operation during data transmission. The system also includes a monitoring circuit for detecting an indication bit signifying the presence or absence of data in the time slot.

Abstract: A mobile radio telecommunication system and method provide battery-saving receiving of mobile stations. The mobile station autonomously changes the period of intermittence according to the frequency of paging in order to reduce the power consumption of the mobile station. When there has not been paging processing for a fixed time, the mobile station autonomously prolongs the period of intermittence and reregisters a new period of intermittence. In case there has been paging processing, the mobile station shortens the period of intermittence. If blocking has occurred for paging from the cell site, the cell site incorporates blocking information into a broadcast signal, informs the mobile station of occurrence of blocking, and registers a new period of intermittence.

Abstract: A system for transmitting a scramble signal for a sky port scramble system including an organization center for organizing data relating to customers etc. and first and second control units each having a system controller and a scrambler for performing the scramble processing on the basis of the customer data sent from the organization center. In a normal state, the organization center communicates with one of the first and second control units and each of the first and second control units is operated in the same manner. In case of the occurrence of an abnormality or a fault in the communication control unit, only the other control unit is operated and the organization center communicates with the other control unit instead.

Abstract: A speech path switching method for use in a radiotelephone system suitable for a private branch radio exchange system. In the radiotelephone system, portable-type cordless telephone sets are respectively connected via intrasystem base stations each disposed in an associated location in the system and each provided with a radio transmission and reception function, a portable-type cordless telephone set in use for a speech transmits, in order to change a combination with a base station, a speech path switch request through a manual operation or in an automatic manner to available base stations existing in the proximity of the base station currently being linked with the telephone set. Each base station sequentially sends a response signal in reply to the speech path switch request such that the telephone set monitors a reception level of the response signal to determine as a switch destination a base station of which the response signal develops a highest reception level as a result of the monitor operation.

Abstract: Information is transmitted by a digital audio transmission line, which may include recording and playback from a digital audio disc, that includes information other than conventional two-channel audio signals and in which error correction of the data transmitted in either direction between a user and a medium is provided. Information integrity is maintained by a first and second cross-interleave Reed-Solomon code (CIRC), in which a third Reed-Solomon code is overlaid on the CIRC code, whereby a sector is built from user words and protected by a quasi-product code, and then an encoded sector is divided into groups, which are group-wise presented to the CIRC encoder.

Abstract: Apparatus for playback from a disc on which main digital data and subsidiary digital data for selectively reproducing of the main digital data have been recorded in multiplex fashion incorporates a write clock generator for generating a write clock synchronized with a reproduced signal from the disc, a read clock generator for generating a read clock having a predetermined period, a buffer memory into which main digital data and subsidiary digital data reproduced from the disc are written and read out in response to the read clock so as to de-interleave the main digital data, and a control unit for seeking a position to be reproduced in the main digital data in response to the subsidiary digital data read out from the buffer memory. The buffer memory into which the subsidiary digital data is written may be a FIFO buffer register which is provided separately from the buffer memory into which the main digital date is written.

Abstract: A circuit for operating finite fields performs multiplication or division using an accumulator for storing an arbitrary element and an adder for performing modulo 2 addition, using the contents of the accumulator and a vector representation of the primitive polynomial; or first and second tables for translating exponents with elements of the polynomial over the finite field, with a binary arithmetic unit for performing addition or subtraction using such exponents.

Abstract: A disc player, for reproducing program information from a disc on which the information is recorded as digital program information data accompanied by digital address data, comprises an optical reader for reading program information data and address data from the disc, such reader being selectively operable in a searching mode and in a playback mode, processing circuitry supplied with program information data to produce program information from the program information data, a detecting means that compares designated address data identifying desired program information with the reproduced address data in the output of the reader and system controlling means for controlling the reader to continue the searching mode until the reproduced address data match the designated address data, at which time the system controlling means operates the reader in its playback mode to read from the disc the program information data identified by the designated address data.

Abstract: Information is transmitted by a digital audio transmission line, which may include recording and play back from a digital audio disc, that includes information other than conventional two channel audio signals and error correction of the data transmitted in either direction between a user and a medium is provided. Information integrity is maintained by a first and second cross-interleave Reed-Solomon code (CIRC), in which a third Reed-Solomon code is overlaid on the CIRC code, whereby a sector is built from users words and protected by a quasi-product code, and then an encoded sector is divided into groups, which are group-wise presented to the CIRC encoder.

Abstract: There is provided an apparatus for correcting errors in data which has, as a unit, (n+k+m+l) symbols subjected to the processing for the error correction coding when data consisting of different kinds of n symbols and m symbols is transmitted as a unit. This error correcting apparatus comprises: a first decoder to which (n+k) symbols are supplied and which generates a first flag signal indicative of the error state by at least performing the error detection; and a second decoder to which the (n+k) symbols corrected by the first decoder and the (m+l) symbols received are supplied and which generates a second flag signal representing the error state by performing the error detection and performs the error correction using the first and second flag signals.

Abstract: A digital audio disc system having a main channel in which main data consisting of audio PCM signals and codes for error correction are recorded and a subchannel in which information digital signals other than said main data are recorded is disclosed. The code signals comprising a sync signal which has a prescribed bit pattern, a display position data, a command for a computer, and a display data relating a content of said audio PCM signals are also recorded multi-times on the disc together with said main data so as to enable the error check of said code signals. Both code signals and main data are reproduced and supplied to a display unit so as to indicate the correct display information data on a display screen under control of a microcomputer provided in the playback side.

Abstract: A disc player, for reproducing program information from a disc on which the information is recorded as digital program information data accompanied by digital address data, comprises an optical reader for reading program information data and address data from the disc, such reader being selectively operable in a searching mode and in a playback mode, processing circuitry supplied with program information data to produce program information from the program information data, a detecting means that compares designated address data identifying desired program information with the reproduced address data in the output of the reader and system controlling means for controlling the reader to continue the searching mode until the reproduced address data match the designated address data, at which time the system controlling means operates the reader in its playback mode to read from the disc the program information data identified by the designated address data.

Abstract: Apparatus permits the use of a known optical compact audio disc for providing a larger memory capacity so that data other than audio data can be reproduced therefrom while maintaining consistency with respect to signal format and signal processing, such as error correcting methods and recording data formats and the like, by providing write clock signals and read-out clock signals for reading into and out two memories the main digital data signal by using a subdigital data signal that is recorded on the disc along with the main digital data and which is reproduced from the disc at the same time as the main data in order to provide addressing of the main digital data on a more accurate level and with finer resolution, and a control system searches a playback location of the main digital data based upon the subdigital data as read out from the buffer memory, in which subdigital data has been written by the write clock signal.

Abstract: There is provided an apparatus for correcting errors in data which has, as a unit, (n+k+m+l) symbols subjected to the processing for the error correction coding when data consisting of different kinds of n symbols and m symbols is transmitted as a unit. This error correcting apparatus comprises: a first decoder to which (n+k) symbols are supplied and which generates a first flag signal indicative of the error state by at least performing the error detection; and a second decoder to which the (n+k) symbols corrected by the first decoder and the (m+l) symbols received are supplied and which generates a second flag signal representing the error state by performing the error detection and performs the error correction using the first and second flag signals.

Abstract: Information is transmitted by a digital audio transmission line, which may include recording and play back from a digital audio disc, that includes information other than conventional two channel audio signals and error correction of the data transmitted in either direction between a user and a medium is provided. Information integrity is maintained by a first and second cross-interleave Reed-Solomon code (CIRC), in which a third Reed-Solomon code is overlaid on the CIRC code, whereby a sector is built from users words and protected by a quasi-product code, and then an encoded sector is divided into groups, which are group-wise presented to the CIRC encoder.