公开(公告)号：JP2002330091A

公开(公告)日：2002-11-15

申请号：JP2001134083

申请日：2001-05-01

Applicant: TOA CORP

Inventor： YAMADA AKIHIRO ,  YOSHIKAWA SUSUMU

IPC: H04B7/08 ,  H04B7/12

Abstract: PROBLEM TO BE SOLVED: To extend a receiving region. SOLUTION: A receiving system comprises a plurality (N) of receivers each having a voice input terminal 26 and an RSSI input terminal 29, and a voice output terminal 27 and an RSSI output terminal 30. These receivers are connected in series to constitute the system. Each receiver compares a own RSSI voltage with the RSSI voltage input from the receiver of a preceding stage side, and transmits the voice signal and the RSSI voltage of the receiver of the side which good receives the higher RSSI voltage, that is, a radio wave in a stronger receiving electric field, as its own signal to the receiver of the subsequent stage side. Thus, the voice signal and the RSSI voltage of the receiver which best receives the radio wave of the respective receivers re output from the receiver [N] disposed at the last. Accordingly, when the respective receives are disposed suitably separately, the receiving region as the receiving system can be extended.

公开(公告)号：JP2002164824A

公开(公告)日：2002-06-07

申请号：JP2000357341

申请日：2000-11-24

Applicant: TOA CORP

Inventor： TOMORI JIYUNJI ,  YOSHIKAWA SUSUMU

IPC: H04B1/10 ,  H04B7/08 ,  H04B7/26

Abstract: PROBLEM TO BE SOLVED: To prevent generation of noise by operating squelch function at the time of antenna-switch on a diversity receiver using antenna-switching receiving method. SOLUTION: In this diversity receiver, a control part 8 turns on a switch circuit 11 just before an antenna 1 made valid through switching by a switch circuit 2. By this operation, a squelch control circuit 9 turns an output of a squelch switch 5 on-state compulsorily, where the on-state of the output is maintained for a prescribed time by the time constant of a smoothing capacitor 94 which constitutes the squelch control circuit 9. Consequently, even if the receiving condition by the switched antenna 1 is bad, the squelch switch 5 becomes the off-state of the output and the so-called squelch function will not operate by means of that the switch circuit 2 switches over as the original antenna 1 is valid again in the prescribed time. Therefore, it can be prevented to output a noise of peculiar sound 'puttyu' by operating the squelch function.

公开(公告)号：JP2002084532A

公开(公告)日：2002-03-22

申请号：JP2000273567

申请日：2000-09-08

Applicant: TOA CORP

Inventor： YOSHIKAWA SUSUMU

IPC: H04N5/265 ,  H04N5/268 ,  H04N7/18

Abstract: PROBLEM TO BE SOLVED: To provide an image transmission system which enables dynamic image display, even when an image is framed on a monitor. SOLUTION: In this image transmission system, a master station 50 equipped with a controller 5 and a monitor 6 and a plurality of slave stations 10, each being equipped with a camera are connected by one channel transmission path. The master station 50 specifies a slave station 10, to which image data to be displayed on the monitor 6 next is sent and sends a control signal for notifying a state that the image data is displayed on the monitor 6 to the specified slave station 10. In response to this signal, the specified slave station 10 successively sends image data for switch display and image data for framing.

公开(公告)号：JP2000201136A

公开(公告)日：2000-07-18

申请号：JP71699

申请日：1999-01-05

Applicant: TOA CORP

Inventor： YOSHIKAWA SUSUMU

IPC: H04N7/22 ,  H04B10/11 ,  H04B10/114 ,  H04B10/54 ,  H04B10/548 ,  H04J14/00 ,  H04J14/02 ,  H04N21/647 ,  H04B10/10 ,  H04B10/105 ,  H04B10/22

Abstract: PROBLEM TO BE SOLVED: To make it possible to receive optical signals transmitted from plural transmitters only by one receiver. SOLUTION: Respective transmitters 1 to 3 respectively modulate the frequency of subcarriers having respectively different frequency bands f1 to f3 by respective signals to be transmitted, modulate the luminance of light by these modulated signals and transmit respective luminance-modulated optical signals to a receiver 4. The receiver 4 receives these optical signals sent from respective transmitters 1 to 3 and converts the optical signals into electric signals. Then the receiver 4 extracts respective subcarriers from these electric signals and demodulates these extracted subcarriers to reproduce respective signals transmitted from respective transmitters 1 to 3. These frequency bands f1 to f3 of respective subcarriers are set up so as not to be mutually modulated. Consequently highly reliable optical space communication having no effect of mutual modulation can be realized.

公开(公告)号：JPH0360544A

公开(公告)日：1991-03-15

申请号：JP19715289

申请日：1989-07-28

Applicant: TOA CORP

Inventor： YOSHIKAWA SUSUMU

IPC: H04W84/08 ,  H04B7/26

Abstract: PURPOSE:To find out an idle channel without incurring mis-decision within a short time by using a communication channel representing to be an idle channel depending on a list showing the operating state of a communication channel generated based on a control signal sent to a control channel, and making communication. CONSTITUTION:A control signal sent to a control channel with another equipment making a call is read by a control signal read section 14, a data representing a communication channel is supplied to a list control section 151, a group code is to a code control section 16 and a data representing the communication channel and a data representing the communication mode are fed to a channel control section 12. When the group code fed from the control signal read section 14 is coincident with the group code entered by an operation section 17, the code control section 16 sends the code to the channel control section 12 and a value instructing the frequency of the communication channel is sent to an idle channel output 12a to set a reception section 115, and a transmission section 113 to a communication channel sent from the control signal read section 14, a value instructing the frequency of the communication channel is sent to an idle channel output 12a.

公开(公告)号：JP2007129518A

公开(公告)日：2007-05-24

申请号：JP2005320515

申请日：2005-11-04

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： MATSUMOTO YASUSHI ,  YOSHIKAWA SUSUMU

IPC: H04L7/00

Abstract: PROBLEM TO BE SOLVED: To provide a technique for eliminating a phase difference of output data in one and the same area and preventing occurrence or the like of an echo even when that a plurality of reception terminals receive and output digital data transmitted from a remote place. SOLUTION: In the digital data transmission system, each reception terminal includes: a synchronizing signal reception section for receiving an external synchronizing signal; a data reception section for receiving transmission data transmitted via a network; a data storage section for temporarily storing digital data included in the received transmission data; a reproduction control section for controlling a reproduction timing on the basis of the synchronizing signal received by the synchronizing signal reception section; a D/A conversion section for starting reading of the digital data stored in the data storage section and converting the digital data into analog data; and a data output section for outputting the analog data converted from the digital data by the D/A conversion section. COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：为了提供一种用于消除同一区域中的输出数据的相位差并且防止回波的发生的技术，即使当多个接收终端接收和输出从 一个偏远的地方。 解决方案：在数字数据传输系统中，每个接收终端包括：同步信号接收部分，用于接收外部同步信号; 数据接收部分，用于接收通过网络发送的传输数据; 数据存储部分，用于临时存储所接收的传输数据中包括的数字数据; 再现控制部分，用于根据由同步信号接收部分接收的同步信号控制再现定时; D / A转换部分，用于开始读取存储在数据存储部分中的数字数据，并将数字数据转换为模拟数据; 以及数据输出部分，用于输出由D / A转换部分从数字数据转换的模拟数据。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2007129517A

公开(公告)日：2007-05-24

申请号：JP2005320514

申请日：2005-11-04

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： MATSUMOTO YASUSHI ,  YOSHIKAWA SUSUMU

IPC: H04L7/04

Abstract: PROBLEM TO BE SOLVED: To provide a digital data transmission system and a digital data transmission method capable of increasing a transmission rate and keeping the image quality and the sound quality high in the case of transmitting digital data via a network. SOLUTION: The digital data transmission system is characterized in such that an external clock reception section of a transmission side terminal and an external clock reception section of a reception side terminal receive clock signals from external clock sources whose frequency precision is the same as each other, and a data transmission section of the transmission side terminal and a data reception section of the reception side terminal are controlled for transmission reception of data packets on the basis of the clock signals. COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：提供一种数字数据传输系统和数字数据传输方法，其能够在通过网络发送数字数据的情况下提高传输速率并保持图像质量和声音质量。 解决方案：数字数据传输系统的特征在于，发送侧终端的外部时钟接收部分和接收侧终端的外部时钟接收部分接收来自外部时钟源的时钟信号，其频率精度相同 控制发送侧终端的数据发送部和接收侧终端的数据接收部，根据时钟信号进行数据包的发送接收。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2006025111A

公开(公告)日：2006-01-26

申请号：JP2004200583

申请日：2004-07-07

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： YOSHIKAWA SUSUMU

IPC: H04B10/11 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/278 ,  H04B10/548

Abstract: PROBLEM TO BE SOLVED: To provide an infrared-ray receiving device that excludes influence of noise light such as sunlight.
SOLUTION: In each light receiving circuit 70, a high-frequency signal based upon infrared rays incident on a photodiode 50 is inputted to an add circuit 84 through a preamplifier circuit 78, a buffer amplifier circuit 80 and a switching circuit 82. Further, a high-frequency signal having been amplified by the preamplifier circuit 78 is inputted to a comparator circuit 90 as well through a band-pass filter 86 and a rectifier circuit 88. When noise light is incident on the photodiode 50, the output level of the comparator circuit 88 rises above a prescribed reference level. In this case, the comparator circuit 90 turns off the switching circuit 82. When the noise light is not incident, the switching circuit 82 is turned on. Namely, when noise light is incident on any photodiode 50, the output of the light receiving circuit 70 corresponding to the photodiode 50 is automatically invalidated.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种不包括太阳光等噪声光的影响的红外线接收装置。 解决方案：在每个光接收电路70中，基于入射到光电二极管50上的红外线的高频信号通过前置放大器电路78，缓冲放大器电路80和开关电路82输入到加法电路84。 此外，已经由前置放大器电路78放大的高频信号也通过带通滤波器86和整流电路88输入到比较器电路90.当噪声光入射到光电二极管50上时，输出电平 比较器电路88上升到规定的参考电平以上。 在这种情况下，比较器电路90关断开关电路82.当噪声光不入射时，开关电路82导通。 也就是说，当噪声光入射到任何光电二极管50上时，对应于光电二极管50的光接收电路70的输出自动失效。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2005327800A

公开(公告)日：2005-11-24

申请号：JP2004142446

申请日：2004-05-12

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： YOSHIKAWA SUSUMU ,  OKAZAKI SHIGETOSHI

IPC: H01L31/10 ,  H01L31/02 ,  H01L31/12

Abstract: PROBLEM TO BE SOLVED: To provide a light receiving device capable of reducing the size of an apparatus employing the light receiving device. SOLUTION: A photodiode 6 generating an electric signal in response to reception of light on the light receiving surface 6a is fixed to a small printed board 10. An electromagnetic shield cover 14 formed independently from the photodiode 6 is arranged in front of the photodiode 6, and the electromagnetic shield cover 14 is fixed to the small printed board 10. The shield cover 14 is provided integrally with a section 14d being secured to a substrate 2 while making a predetermined angle against the securing section 14 fixed to the substrate 2 in contact therewith. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种能够减小采用光接收装置的装置的尺寸的光接收装置。 解决方案：将响应于在光接收表面6a上的光的接收产生电信号的光电二极管6固定到小型印刷电路板10.独立于光电二极管6形成的电磁屏蔽罩14布置在 光电二极管6，电磁屏蔽罩14固定在小型印刷电路板10上。屏蔽罩14与固定在基板2上的部分14d一体地设置，同时与固定在基板2上的固定部分14成预定的角度 与其接触。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2003348023A

公开(公告)日：2003-12-05

申请号：JP2002157418

申请日：2002-05-30

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： YOSHIKAWA SUSUMU

IPC: H04L1/00 ,  H04B14/04

Abstract: PROBLEM TO BE SOLVED: To provide a method for reducing noise in a packet communication of a digital signal of audio or the like. SOLUTION: Digital signals in a packet form including a plurality of digital words are received (400). Next, when part of continuous packets is omitted (408), a digital word for interpolating the omitted packet part is created (412). This interpolation is performed by creating an interpolation digital word by using the last digital word in a packet immediately before the omitted packet part and a prescribed value at an interval of the omitted packet part. In addition, after the omitted packet part, a linking digital word that smoothly connects a value indicated by the interpolated digital word with a value indicated by a digital word in a packet after the omitted packet part is created (418). COPYRIGHT: (C)2004,JPO

Abstract translation: 要解决的问题：提供一种降低音频数字信号等的分组通信中的噪声的方法。

解决方案：接收包括多个数字字的分组形式的数字信号（400）。 接下来，当省略连续分组的一部分（408）时，创建用于内插所省略的分组部分的数字字（412）。 通过使用紧接在省略的分组部分之前的分组中的最后数字字，并以省略的分组部分的间隔的规定值，创建内插数字字来执行该内插。 此外，在省略了分组部分之后，链接数字字在创建省略的分组部分之后平滑地将由内插的数字字指示的值与数据包中的数字字指示的值相连接（418）。 版权所有（C）2004，JPO