公开(公告)号：AU3052701A

公开(公告)日：2001-08-14

申请号：AU3052701

申请日：2001-01-30

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H03G3/00 ,  H03G3/30 ,  H03M1/18 ,  H04B1/3822 ,  H04B1/40 ,  H04B1/64

公开(公告)号：EP1263143A4

公开(公告)日：2007-04-04

申请号：EP01902667

申请日：2001-01-30

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H04B1/64 ,  H03G3/00 ,  H03G3/30 ,  H03M1/18 ,  H04B1/3822 ,  H04B1/40

CPC classification number: H04B1/64 ,  H03G3/001 ,  H03G3/3042

Abstract: The invention provides a digital communication system that prevents receivers from making noise. In a transmitter, an analog input signal is converted to a digital signal, which is compared with a predetermined level by a power level detector (5). The transmitter transmits a signal, which contains the digital signal or its amplified version and a control bit representative of the result of comparison. A receiver produces an analog output converted from the digital signal or an analog signal converted from the amplified digital signal, depending on the control bit in the received digital signal.

公开(公告)号：JP2013081244A

公开(公告)日：2013-05-02

申请号：JP2012281805

申请日：2012-12-25

Applicant: Toa Corp ,  Toa株式会社

Inventor： MATSUMOTO YASUSHI ,  MAEDA KAZUAKI

IPC: H04R3/04

CPC classification number: H03G5/025 ,  H03H17/0294 ,  H03H2017/0297

Abstract: PROBLEM TO BE SOLVED: To provide an acoustic control device capable of facilitating adjustment of acoustic quality according to listeners' preferences and/or various applications.SOLUTION: An acoustic control device includes: an FIR filter 11 that performs filtering corresponding to a preset filter coefficient for an input audio signal and outputs the signal; an operation input section 13 that specifies an amplitude characteristic and a phase characteristic to be implemented after changes for the purpose of changing the amplitude characteristic and the phase characteristic of the FIR filter 11; and an arithmetic control section 12 that sets, to the FIR filter 11, a filter coefficient corresponding to an amplitude characteristic and a phase characteristic designated by the operation input section 13.

Abstract translation: 要解决的问题：提供一种能够根据听众的喜好和/或各种应用促进声学质量的调节的声学控制装置。 声控制装置包括：FIR滤波器11，对输入音频信号进行与预设的滤波器系数对应的滤波，并输出该信号; 指定用于改变FIR滤波器11的振幅特性和相位特性的改变之后要实现的幅度特性和相位特性的操作输入部分13; 以及算术控制部12，其向FIR滤波器11设定与由操作输入部13指定的振幅特性和相位特性对应的滤波器系数。（C）2013，JPO＆INPIT

公开(公告)号：JP2010028462A

公开(公告)日：2010-02-04

申请号：JP2008187551

申请日：2008-07-18

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： MATSUSHITA SHOGO ,  MAEDA KAZUAKI

IPC: H04L12/885 ,  H04L7/00

Abstract: PROBLEM TO BE SOLVED: To provide a noise reduction processing method capable of suppressing noise generated by the difference of the processing speed between the transmitting side and the receiving side in the digital communication system for asynchronously transmitting and receiving streaming data. SOLUTION: The digital signal receiving device includes: a receiver 1 for receiving the streaming data transmitted from the transmitting device; and a digital-analog converter (hereinafter, to be referred to simply as DAC3) for converting the digital signal output from a data compensation part constituted of DSP2 and data compensation part to audio sound. Furthermore, specifically, the data compensation part includes a write pointer for writing the streaming data received from the receiver 1; three types of buffers, r_data_buf21, x_data_buf22, and p_data_buf23 for writing data of the data compensation part; and a read pointer for reading data of the buffer to transmit to the DAC3. COPYRIGHT: (C)2010,JPO&INPIT

Abstract translation: 解决的问题：提供一种噪声降低处理方法，能够抑制由数字通信系统中的发送侧和接收侧之间的处理速度之差产生的噪声，用于异步发送和接收流数据。 数字信号接收装置包括：接收机1，用于接收从发送装置发送的流数据; 以及用于将从DSP2和数据补偿部分构成的数据补偿部分输出的数字信号转换成音频声音的数模转换器（以下简称为DAC3）。 此外，具体地，数据补偿部分包括用于写入从接收机1接收的流数据的写指针; 用于写入数据补偿部分的数据的三种类型的缓冲器r_data_buf21，x_data_buf22和p_data_buf23; 以及用于读取缓冲器的数据以发送到DAC3的读指针。 版权所有（C）2010，JPO＆INPIT

公开(公告)号：JP2001217714A

公开(公告)日：2001-08-10

申请号：JP2000021681

申请日：2000-01-31

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H03M1/12 ,  H03M1/66 ,  H04L7/00 ,  H04L29/08

Abstract: PROBLEM TO BE SOLVED: To provide a communication system capable of securing a sufficient dynamic range. SOLUTION: Corresponding to the compared result of an analog signal and a prescribed level, a transmitter sends out a transmitting signal containing any one of a digital signal, with which the digital conversion of the analog signal is performed, and a digital signal, with which the digital conversion of the analog signal is performed after analog amplification, and a control bit C expressing the compared result. Corresponding to the control bit C contained in the received digital signal, a receiver outputs a signal, with which the received digital signal is converted into an analog signal, or signal, with which the analog amplification of the received digital signal is performed after conversion into the analog signal.

公开(公告)号：JP2007126983A

公开(公告)日：2007-05-24

申请号：JP2005318295

申请日：2005-11-01

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： YAMAMOTO TOSHIHIRO ,  MAEDA KAZUAKI

IPC: F04D27/00 ,  F04D29/66 ,  G10K11/178

Abstract: PROBLEM TO BE SOLVED: To provide, with reduced cost, a compact and simply formed drive device in which noise such as wind noise generating from an electric fan is canceled by the electric fan itself. SOLUTION: The noise such as wind noise generating from the electric fan 12 is detected by a microphone 24. Based on the result of detection by the microphone 24, a control circuit 26 generates a noise control signal to cancel the noise 22 and inputs it into a modulation circuit 16. The modulation circuit 16 modulates a drive signal to drive the electric fan 12 by the noise control signal. Therefore, the electric fan 12 rotates while changing the rotating speed according to the noise control signal and functions as so-called a pneumatic loudspeaker. Consequently, the noise 22 such as the wind noise naturally emitted from the electric fan 12 is canceled by the control noise 28 intentionally emitted from the electric fan 12 as the pneumatic loudspeaker. COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：为了降低成本，提供一种紧凑且简单形成的驱动装置，其中由电风扇自身消除诸如从风扇产生的风噪声等噪声。 解决方案：由麦克风24检测来自电风扇12产生的风噪声的噪声。基于麦克风24的检测结果，控制电路26产生噪声控制信号以消除噪声22和 将其输入调制电路16.调制电路16调制驱动信号以通过噪声控制信号驱动电风扇12。 因此，电风扇12根据噪声控制信号而改变转速而旋转，并且起到所谓的气动扬声器的作用。 因此，作为气动扬声器，从电风扇12有意地发出的控制噪声28消除了从电风扇12自然发出的风噪声等噪音22。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2006339802A

公开(公告)日：2006-12-14

申请号：JP2005159488

申请日：2005-05-31

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： OKAMOTO RYOSUKE ,  AZUMA HIROSHI ,  MAEDA KAZUAKI

IPC: H04M3/56

Abstract: PROBLEM TO BE SOLVED: To increase the number of participants in a conference without improving the capability of existing servers.
SOLUTION: Servers are divided hierarchically into an upper layer server 2c and lower layer servers 2a, 2b, wherein the server 2a supplies sound signals from terminals 4a through 4d and the server 2b supplies sound signals from terminals 4e through 4g while mixing to the upper layer server 2c. The upper layer server 2c supplies a lower layer mixing sound signal from the lower layer server 2a as an upper layer mixing sound signal to the lower layer server 2b, and supplies a lower layer mixing sound signal from the lower layer server 2b as an upper layer mixing sound signal to the virtual server 2b. The server 2a supplies the mixing signal of an upper layer mixing sound signal from the upper layer server 2c and sound signals from the terminals 4a through 4d excepting its own terminal to the terminals 4a through 4d. It is also true for the server 2b.
COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：增加会议参与者的数量，而不会提高现有服务器的能力。 解决方案：服务器分层划分为上层服务器2c和下层服务器2a，2b，其中服务器2a从端子4a至4d提供声音信号，并且服务器2b从端子4e至4g提供声音信号，同时混合到 上层服务器2c。 上层服务器2c将作为上层混合声音信号的下层服务器2a的下层混合声音信号提供给下层服务器2b，并且将来自下层服务器2b的下层混合声音信号作为上层 将声音信号混合到虚拟服务器2b。 服务器2a将来自上层服务器2c的上层混合声音信号的混合信号和来自端子4a至4d的声音信号提供给终端4a至4d，除了其本身的终端之外。 对于服务器2b也是如此。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2001217717A

公开(公告)日：2001-08-10

申请号：JP2000021685

申请日：2000-01-31

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H03M1/66 ,  H04L29/08

Abstract: PROBLEM TO BE SOLVED: To provide a digital communication system with which no switching noise is generated in a receiver. SOLUTION: In response to the compared result of an analog input signal and a prescribed level, a transmitter combines and transmits a digital signal, with which the digital conversion of the analog input signal or analog input signal after analog amplification is performed, and a control bit expressing the compared result. The receiver is provided with processing parts 12 and 13 for selectively outputting the received digital signal or digital signal, with which this received digital signal is amplified by a digital amplifier, corresponding to the control bit contained in the received digital signal and a D/A converter 15 for converting the digital signal outputted to these processing parts into an analog signal.

公开(公告)号：JPH10224415A

公开(公告)日：1998-08-21

申请号：JP3277697

申请日：1997-01-31

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H04L27/20 ,  H04L27/22

Abstract: PROBLEM TO BE SOLVED: To eliminate the need for a phase rotation circuit of a conventional configuration to rotate a phase of a base band signal in the modulator of the phase shift phase modulation system. SOLUTION: This modulator is provided with an oscillator 5 oscillating a high frequency signal with a frequency equivalent to a center frequency fc of a modulation output, an oscillator 5a that oscillates a high frequency signal with a frequency fb ' corresponding to a frequency fb of a base band signal to be sent, each high frequency signal is processed by a waveform synthesis circuit 8 to generate a complex carrier signal whose phase is rotated by a prescribed amount for each symbol of the base band signal. Then the complex carrier signal is phase-modulated by an in-phase component I'(t) and a quadrature component Q'(t) of the base band signal to generate a modulation output based on the phase shift phase modulation system.

公开(公告)号：JPH10164158A

公开(公告)日：1998-06-19

申请号：JP33045296

申请日：1996-11-25

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H04L27/14 ,  H04L27/20

Abstract: PROBLEM TO BE SOLVED: To stabilize the precision of modulation wave S(t) and also to improve noise resistance performance by constituting a most part of a modulator by means of a digital circuit. SOLUTION: Waveform data corresponding to the whole patterns of baseband signals to be transmitted is previously stored in an analysis waveform data ROM 3. Then, waveform data corresponding to the baseband signal which is actually inputted from an input terminal 1 is read from the stored data, it is converted into an analog signal by a D/A converter 4 and, by this conversion modulation wave S(t) corresponding to the baseband signal is generated. The modulation wave S(t) is outputted from an output terminal 10 with a band limiting analog filter 5. A reading circuit part 2 generates address data of ROM 3 in accordance with the baseband signal which is actually inputted.