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29 records (took 0.02 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE60226991D1

    公开(公告)日：2008-07-17

    申请号：DE60226991

    申请日：2002-10-08

    Applicant: TOA CORP

    Inventor： SHIBUYA TAKAKO ,  TANAKA TOMOHISA

    IPC: H04L1/00 ,  G10L21/02

    Abstract: Digital audio data with error detection bits added thereto is inputted to an error detecting and correcting device (4). The correcting device (4) corrects an error when the error is detected in the digital audio data. The digital audio data outputted from the error detecting and correcting device (4) is inputted to an impulse noise suppressing circuit (6). The suppressing circuit (6) operates for a predetermined time period when the correcting device (4) detects an error.

    DIGITAL WIRELESS RECEIVER USING ANTENNA DIVERSITY METHOD
    2.
    发明专利
    DIGITAL WIRELESS RECEIVER USING ANTENNA DIVERSITY METHOD 未知

    公开(公告)号：AU2003241948A1

    公开(公告)日：2003-12-19

    申请号：AU2003241948

    申请日：2003-05-30

    Applicant: TOA CORP

    Inventor： TANAKA TOMOHISA

    IPC: H04B7/08 ,  H04B7/26

    Abstract: Receiving antennas 2 a , 2 b receive a digital modulated signal from a digital wireless microphone. The digital modulated signal comprises a carrier signal modulated with successively generated digital signal trains. A changeover switch 4 selects one of the antennas 2 a , 2 b in response to a selection signal. A high-frequency unit 8 , a demodulating unit 10 and a decoding unit 12 receive and demodulate the digital modulated signal received by the selected antenna. Analog comparators 24 a , 24 b compare a reception level indicative signal from the high-frequency unit 8 with threshold values, and a diversity judging unit 28 changes the selection signal in accordance with the comparison result. The digital signal trains comprise a plurality of successive frames, and each frame includes an information data section, a preamble section preceding the information data section for establishing synchronization of the information data section, and a guard bit section succeeding the information data section. Each time the guard bit section is received, the selection signal is changed and the antenna selection is performed.

    IMPULSE NOISE SUPPRESSION DEVICE
    3.
    发明公开
    IMPULSE NOISE SUPPRESSION DEVICE 有权
    DEVICE减少脉冲噪声

    公开(公告)号：EP1441460A4

    公开(公告)日：2007-05-02

    申请号：EP02800788

    申请日：2002-10-08

    Applicant: TOA CORP

    Inventor： SHIBUYA TAKAKO ,  TANAKA TOMOHISA

    IPC: G10L21/02 ,  H04L1/00

    CPC classification number: G10L21/0208 ,  H04L1/004

    Abstract: Digital audio data with error detection bits added thereto is input into an error detection and correction unit 4. The correction unit 4 corrects an error when the error is detected in the digital audio data. The digital audio data output from the error detection and correction unit 4 is input into an impulse noise suppression circuit 6. The suppression circuit 6 is operated for a predetermined time when the error detection and correction unit 4 has detected an error.

    7.
    发明专利
    未知

    公开(公告)号：AT539509T

    公开(公告)日：2012-01-15

    申请号：AT02700758

    申请日：2002-02-25

    Applicant: TOA CORP

    Inventor： SHIBUYA TAKAKO ,  TANAKA TOMOHISA

    IPC: H04L1/00 ,  G06F11/10 ,  H04B1/04

    Abstract: A transmitter (1) converts an input signal from a microphone (2) into a plural-bit digital signal by means of an A/D converter (4) at predetermined time intervals. An encoder (6) divides the digital signal into plural blocks and adds a parity bit to each block to thereby form a coded signal. A transmitting unit (8) modulates a carrier with the coded signal and transmits the modulated carrier through an antenna (10). A receiver (12) includes two tuning units (18A, 18B). Corresponding coded signals outputted from the tuning units (18A, 18B) are inputted to a decoder (20). The decoder (20) makes a parity check on respective blocks of the corresponding coded signals and selects and outputs an error-free one of the corresponding blocks of the corresponding coded signals.

    8.
    发明专利
    未知

    公开(公告)号：AT397813T

    公开(公告)日：2008-06-15

    申请号：AT02800788

    申请日：2002-10-08

    Applicant: TOA CORP

    Inventor： SHIBUYA TAKAKO ,  TANAKA TOMOHISA

    IPC: H04L1/00 ,  G10L21/02

    Abstract: Digital audio data with error detection bits added thereto is inputted to an error detecting and correcting device (4). The correcting device (4) corrects an error when the error is detected in the digital audio data. The digital audio data outputted from the error detecting and correcting device (4) is inputted to an impulse noise suppressing circuit (6). The suppressing circuit (6) operates for a predetermined time period when the correcting device (4) detects an error.

    DIGITAL RADIO RECEIVER
    9.
    发明专利
    DIGITAL RADIO RECEIVER 未知

    公开(公告)号：AU2003235112A1

    公开(公告)日：2003-11-10

    申请号：AU2003235112

    申请日：2003-04-24

    Applicant: TOA CORP

    Inventor： TANAKA TOMOHISA

    IPC: H04L27/00 ,  H04B1/10 ,  H04B1/16 ,  H04L1/00 ,  H04L1/20 ,  H04L27/38

    Abstract: A receiving unit ( 2 ) receives a modulated signal resulting from modulating a carrier signal with a digital encoded train resulting from error-correction encoding a digital signal train. A demodulating unit ( 4 ) demodulates the digital encoded train from the received modulated signal. A decoding unit ( 8 ) decodes the digital signal train from the demodulated digital encoded train. The receiving unit ( 2 ) outputs a received-signal strength indicative signal indicative of the received-signal strength of the modulated signal. During demodulating, a bit error rate computing unit ( 18 ) of the decoding unit ( 8 ) computes a bit error rate. The received-signal strength indicative signal and the bit error rate are inputted to a control unit ( 14 ), and, on the basis of these inputs, it is judged which one of the receiving conditions defined by received-signal strength indicative signals and bit error rates, the current receiving condition corresponds to.

    RECEIVER AND RADIO TRANSMISSION SYSTEM
    10.
    发明专利
    RECEIVER AND RADIO TRANSMISSION SYSTEM 审中-公开

    公开(公告)号：JP2003198517A

    公开(公告)日：2003-07-11

    申请号：JP2001401524

    申请日：2001-12-28

    Applicant: TOA CORP

    Inventor： TANAKA TOMOHISA ,  EJIMA KENICHI ,  SHIBUYA TAKAKO ,  KEIJO NOBUYUKI

    IPC: H04L7/00

    Abstract: PROBLEM TO BE SOLVED: To remove distortion depending on jitter or the responsiveness of PLL on a radio transmission line. SOLUTION: On the basis of a digital modulated signal and a first reference signal from a first reference signal source 64, a signal processing part 62 reproduces a transmission clock signal and reproduces digital audio data on the basis of this reproduced transmission clock signal. Synchronously with the reproduced transmission clock signal, the digital audio data are inputted to a sampling rate converter 66. Synchronously with a second reference signal from a second reference signal source 70, the digital audio data are outputted from the sampling rate converter 66 and the outputted digital audio data are converted into analog signals by a digital/analog converter 72. The first and second reference signal sources 64 and 70 mutually independently output the first and second reference signals. COPYRIGHT: (C)2003,JPO

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