Sanyo Electric Co., Ltd.

Semiconductor Components Industries, LLC

Shizuka Ishimura

Kazuhiro Kimura

Takahiko Masumoto

Toshiyuki Ozawa

Yutaka Hirakoso

Shigeaki Hayashibe

Munehiro Suka

Akira Iketani

Mitsuyoshi Fukuda

A manufacturing cost of an integrated circuit chip used in a program update system or in an electronic device with program update function is reduced. A first integrated circuit chip has a USB interface circuit, a compression decoder, a CPU and a mask ROM. The first integrated circuit chip is a single chip consolidating a microcomputer with a USB host function and the compression decoder. A second integrated circuit chip has a CPU and an FROM, and serves as a system microcomputer to control the whole system of a car audio. A control program stored in the mask ROM is updated using the FROM incorporated in the second integrated circuit chip.

Program update system and electronic device with program update function

A communication device (e.g., an vehicle-mounted device) comprises a transmitter that transmits a distance-calculation signal with which to calculate a distance to a partner communication device (e.g., a mobile device), a detector that receives the distance-calculation signal returned from the partner communication device and detects a phase difference between the distance-calculation signal when transmitted and the distance-calculation signal when received, and a calculator that calculates the distance to the partner communication device based on the phase difference detected by the detector.

Communication device and distance calculation system

In a position detection system, a plurality of first communication devices each comprise a transmitter for transmitting a distance-calculation signal for calculating distance to the second communication device; a detector for detecting, by receiving from the second communication device a signal corresponding to the distance-calculation signal, phase difference between the distance-calculation signal when transmitted and the signal corresponding to the distance-calculation signal when received; and a calculator for calculating the distance to the second communication device, based on the phase difference. A second communication device comprises a transmitter for transmitting the signal corresponding to the distance-calculation signal. The position detection system comprises a determining unit for determining whether the multiple distances are below a predetermined distance; and a position detector for detecting the position of a relay device corresponding to the multiple distances when the determining unit has determined that the multiple distances are at or above the predetermined distance.

Position detection system, position detection method therefor, position detection communication device, and communication device

Superimposed FM data is demodulated to digital data. A synchronism reproducing circuit (data block detecting section) detects the front of blocks in the digital data to generate a block head signal (a station change timing signal), which is supplied to a control section of a station selecting microcomputer. When a station selecting key requests a change of the received station, station data corresponding to a requested station is supplied to the control section (a station selecting control section). When the block head signal is inputted after requesting the change of the station, the control section begins to output station change data to a PLL frequency synthesizer in order to change the frequency signal in a front end. This prevents a latter part of a block in received superimposed FM data from being NG data.

FM radio receiver and signal processing device used therein

A key scanning circuit scans a key matrix circuit to generate key input data as for key operations. A remote control decoder decodes an encoded signal, which has been output from a remote control transmitter and received by a remote control receiving circuit, to generate remote control data. A transmission register selectively stores either the key input data or remote control data. By transmitting the data stored in the single transmission register, it is possible to transmit any one of the key input data and remote control data to the microcomputer.

Processing circuit for input signal from key or remote-controller

In accordance with the operation of an operating section 14, a control section 12 performs a reception control operation and demodulates a signal passing through a band pass filter 7 for extracting a multiplex signal using a multiplex signal demodulating section 8 when receiving a broadcast signal. A block synchronization circuit 16 of a synchronization circuit 9 carries out block synchronization processing on the demodulated signal. When block synchronization is established, a synchronization determination signal is supplied to a detecting section DET and the detecting section DET determines that a broadcasting station whose radio waves are currently being received is a multiplex broadcasting station.

FM multiplex broadcast receiving circuit for detecting presence or

In multiplex FM broadcasting, a digital signal is composed of a frame which consists of a predetermined number of blocks in the vertical direction, a block consisting of a predetermined number of bits in the horizontal direction and having a horizontal parity (error correcting code) for correcting errors in the horizontal direction and a vertical parity for correcting errors in the vertical direction. The block also has a control bit for determining whether the error correction in the horizontal direction is to be carried out only once. A decoding identification detector (20) detects the content of the control bit, a controller (12) controls the re-writing of the digital signal into a frame buffer (13) after the error correction of the digital signal in the vertical direction by an error corrector (14). The controller (12) also controls the provision of the digital signal stored in the buffer (13) to the error corrector (14) according to the content of the control bit, determining whether the second error correction in the horizontal direction is to be carried out.

Digital signal processing for controlling error correction based on the

An SI judging circuit in a service detecting section detects a service identification code included in a block included in received superimposed FM data. When the block represents an unnecessary service, the SI judging circuit generates a predetermined service detecting signal, which is supplied to a station selecting microcomputer. A user operates a station selecting key to request the change of the broadcasting station. When the change is requested, and also the service detecting signal indicating that the service included in the received block is not needed is supplied to the station selecting microcomputer by the SI judging circuit, a control section of the station selecting microcomputer outputs station data corresponding to the requested station to a PLL synthesizer, and then the frequency signal (tuning frequency) is changed at a front end. This enables data received during a period for receiving blocks for unnecessary services to be NG, and can prevent data of blocks including necessary services from being NG.

A plurality of remote control decoders are provided for decoding an encoded signal from a remote control receiving module, to generate remote control data, the remote control decoders each decoding a signal encoded in a different remote control data format. A key scanning circuit is provided for scanning a key matrix, to fetch key input data. A selection circuit is provided for selecting either the remote control data from the plurality of remote control decoders or key input data from the key scanning circuit. A transmission register is provided to store the selected data. The stored data are serially transmitted in synchronism with a synchronous signal. With this arrangement, a plurality of kinds of remote control transmitter can be used, in addition to the fact that any of the data from the remote control transmitters and the data from the key matrix can be transmitted via a common communication line.

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Gunma-ken, Japan

Shizuka Ishimura