公开(公告)号：JP2004085723A

公开(公告)日：2004-03-18

申请号：JP2002243982

申请日：2002-08-23

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： MAEDA KAZUAKI

IPC: G10L19/00 ,  H03M7/38 ,  H03M7/40

Abstract: PROBLEM TO BE SOLVED: To provide a compression method and a compression apparatus which can enhance the compression rate of audio data for which real time characteristics are required.
SOLUTION: An input signal a passing an input section 10 and an amplifier 15 is inputted to a compressor 100. The input signal a is subjected to ADPCM (Adaptive Differential Pulse Code Modulation) by an ADPCM encoder 20 and is made into a first compression signal b which is then subjected to entropy encoding by an entropy encoder 30 and is made into a second compression signal c. The second compression signal c is delivered through a transmission buffer 32 and a transmission section 34 to a transmission line 35 and is inputted through a reception section 36 and a reception buffer 38 to an expander 200. The second compression signal c inputted to an entropy encoder 40 and is subjected to entropy decoding and is made into a first expansion signal d which is then subjected to eADPCM decoding by an ADPCM decoder and is outputted as a second expansion signal e. The second expansion signal e is sounded loud through an amplifier 60 and an output section 70.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2000244329A

公开(公告)日：2000-09-08

申请号：JP4639699

申请日：1999-02-24

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

IPC: H03M7/38

Abstract: PROBLEM TO BE SOLVED: To prevent deterioration in a listening sense attended with the increase in a bit error rate. SOLUTION: A transmitter is in operation of adaptive differential pulse code modulation and sends a prediction error signal to a receiver. The receiver is provided with an error rate detection means 31 that detects a bit error rate of the received prediction error signal, inverse quantizers 32-34, a selection means 35 that selects any of differential signals outputted from the inverse quantizers 32-34, and a control means 36 that controls the operation of the selection means 35. The control means 36 is controlled in response to the detected bit error rate to select an inverse quantizer with a different inverse quantization bit number.

公开(公告)号：JP2009044376A

公开(公告)日：2009-02-26

申请号：JP2007206238

申请日：2007-08-08

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： MATSUMOTO YASUSHI ,  MAEDA KAZUAKI

IPC: H04B3/50 ,  H03G1/02 ,  H03G3/02 ,  H04R3/00

Abstract: PROBLEM TO BE SOLVED: To extend a low-cost speaker by utilizing the conventional broadcast facilities.
SOLUTION: An analog audio signal amplified with an amplifier 2 is supplied to the speaker 14 via speaker wires 8N, 8C. A digital modem 38 modulates a high-frequency carrier with a digital audio signal supplied from a controller 34 to generate a digital modulated signal and this digital modulated signal is then supplied to a digital modem 50 via the speaker wires 8N, 8C for demodulation into a demodulated digital signal. The controller 54 converts the demodulated digital signal to an analog signal and then supplies this analog signal to an extended speaker 14a.
COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：通过利用传统的广播设施来扩展低成本的扬声器。 解决方案：用放大器2放大的模拟音频信号通过扬声器线8N，8C提供给扬声器14。 数字调制解调器38利用从控制器34提供的数字音频信号来调制高频载波，以产生数字调制信号，然后该数字调制信号经由扬声器导线8N，8C提供给数字调制解调器50，以便解调成 解调数字信号。 控制器54将解调的数字信号转换为模拟信号，然后将该模拟信号提供给扩展扬声器14a。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2008182583A

公开(公告)日：2008-08-07

申请号：JP2007015352

申请日：2007-01-25

Applicant: Toa Corp ,  ティーオーエー株式会社

Inventor： NEGISHI HIROKAZU ,  OGA TOSHIRO ,  MAEDA KAZUAKI

IPC: H04R23/00

Abstract: PROBLEM TO BE SOLVED: To provide an air flow speaker which generates high grade voice.
SOLUTION: The air flow speaker 1 concerning the present invention is provided with: an air flow generation means 2 for generating air flow; an air flow passage 3 through which the air flow generated by the air flow generation means 2 passes and a passage cross section changing means 4 for changing cross section of the air flow passage 3. Then, an ultrasonic motor 10 is used as a driving source of the passage cross section changing means 4 and the ultrasonic motor 10 is controlled based on a voice signal.
COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 要解决的问题：提供产生高等级语音的气流扬声器。 解决方案：关于本发明的气流扬声器1设置有：用于产生空气流的空气流产生装置2; 通过由气流产生装置2产生的空气流通过的气流通道3和用于改变空气流动通道3的横截面的通道横截面改变装置4.然后，使用超声波马达10作为驱动源 的通道横截面改变装置4和超声波马达10是基于声音信号进行控制的。 版权所有（C）2008，JPO＆INPIT

公开(公告)号：JP2001217742A

公开(公告)日：2001-08-10

申请号：JP2000021986

申请日：2000-01-31

Applicant: TOA CORP

Inventor： MAEDA KAZUAKI

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

Abstract: PROBLEM TO BE SOLVED: To provide a digital communication system wherein no noise is generated in a receiver. SOLUTION: After a transmitter converts an analog input signal to a digital signal, the digital signal is compared with a prescribed level by a power level detector 5. Corresponding to the result, the transmitter sends out a transmitting signal containing the digital signal or the amplified digital signal itself and a control bit expressing the compared result. Corresponding to the control bit contained in the received digital signal, the receiver outputs a signal, with which the received digital signal is converted directly to an analog signal or converted to an analog signal after digital amplification.