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Acoustic signal transmission system, modulation device, demodulation device, and acoustic signal transmission method

An audio signal and transmission system technology, applied in transmission systems, radio transmission systems, ultrasonic/sonic/infrasonic transmission systems, etc. Delay expansion, the effect of dealing with delay expansion

Inactive Publication Date: 2009-03-18
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the frequency of occurrence of reception errors increases

Method used

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  • Acoustic signal transmission system, modulation device, demodulation device, and acoustic signal transmission method
  • Acoustic signal transmission system, modulation device, demodulation device, and acoustic signal transmission method
  • Acoustic signal transmission system, modulation device, demodulation device, and acoustic signal transmission method

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no. 1 Embodiment approach

[0045] FIG. 1 is a configuration diagram of an acoustic signal transmission system included in the acoustic signal transmission system of the first embodiment. 2 is a configuration diagram of an acoustic signal receiving system included in the acoustic signal transmission system of the first embodiment. The acoustic signal transmission system of this embodiment has the acoustic signal transmission system TS1 and the acoustic signal reception system RS1.

[0046] The acoustic signal transmission system TS1 is a system that generates transmission acoustic signals 5L and 5R and outputs them as sound waves 7 . Acoustic signal transmission system TS1 has error correction encoding device 2, modulation device 4A, and a plurality of (in this embodiment, two) speakers 6L, 6R (transmission path).

[0047] The error correction encoding means 2 encodes the transmission data signal 1 using error correction encoding and outputs an encoded transmission signal 3 . The modulation device 4A d...

no. 2 Embodiment approach

[0094] 8 is a configuration diagram of an acoustic signal transmission system included in the acoustic signal transmission system of the second embodiment. Fig. 9 is a configuration diagram of an acoustic signal receiving system included in the acoustic signal transmission system according to the second embodiment. The acoustic signal transmission system of this embodiment has the acoustic signal transmission system TS2 and the acoustic signal reception system RS2.

[0095] The acoustic signal transmission system TS2 of this embodiment has the modulation device 4B instead of the modulation device 4A included in the acoustic signal transmission system TS1 of the first embodiment.

[0096] Acoustic signal receiving system RS2 of this embodiment has a plurality (in this embodiment, two pieces) of microphone 8L and microphone 8R instead of one microphone 8 included in acoustic signal receiving system RS1 of the first embodiment. The microphone 8L receives the sound wave 7 and out...

no. 3 Embodiment approach

[0141] The acoustic signal transmission system of this embodiment has an acoustic signal transmission system and an acoustic signal reception system. The acoustic signal transmission system of the present embodiment includes a modulation device 4C instead of the modulation device 4B included in the acoustic signal transmission system TS2 of the second embodiment. The sound signal receiving system of the present embodiment includes a demodulation device 10C instead of the demodulation device 10B included in the sound signal receiving system RS2 of the second embodiment.

[0142] The modulation device 4C and the demodulation device 10C will be described in detail. FIG. 15 is a diagram showing the configuration of a modulation device according to a third embodiment. The modulation device 4C has: an S / P conversion section (distribution unit) 41C, a modulation section (modulation section) 43L and a modulation section (modulation section) 43R, a guard time signal generation section...

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Abstract

An acoustic signal transmission system of the present invention is a system for transmitting information via sound waves, and has a modulation device, a plurality of speakers, a microphone and a demodulation device. The modulation device generates transmission acoustic signals by encoding transmission signals based on a transmission diversity method and allocating the encoded transmission signals to a plurality of transmission paths. The plurality of speakers output the transmission acoustic signals as sound waves respectively based on the allocation. The microphone receives the sound waves which are output from the plurality of speakers, and outputs received acoustic signals. The demodulation device decodes the received acoustic signals based on the transmission diversity method by using a transfer function of the each sound wave from the plurality of speakers to the microphone.

Description

technical field [0001] The invention relates to an audio signal transmission system, a modulation device, a demodulation device and an audio signal transmission method. Background technique [0002] As communication techniques for transmitting information using sound waves, a method using ultrasonic waves and a method using audible sound waves are known. The advantage of using ultrasonic waves is that since ultrasonic waves cannot be recognized by human hearing, there will be no unpleasant effects on people during transmission. Also, ultrasonic waves can be applied to small-area communication because of their sharp directivity. [0003] An advantage of using audible sound waves is that commercially available audio equipment can be used as communication means. While many audio devices on the market reproduce and record audible sound waves, ultrasonic waves have difficulty. Also, sound waves are attenuated by absorption due to the viscosity of the medium. This absorption a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B11/00H04B7/06H04J1/00H04J11/00H04J15/00H04R3/00H04J99/00
CPCH04B11/00H04J3/0611H04B7/0613H04R3/12
Inventor 松冈保静
Owner NTT DOCOMO INC
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