Title:
発信装置
Document Type and Number:
Japanese Patent JP4545234
Kind Code:
B1
Abstract:
Disclosed is a sending device capable of making it difficult for people to perceive sound waves for transmitting information in an environment where information is transmitted in the form of sound waves. Specifically disclosed is a sending device (10) that converts various encoded information into sound waves in an audible frequency band to send the sound waves, which comprises a microphone (16) to which background sound at a site where the sound waves are sent is input as a background sound signal; a peak-frequency detecting unit (107) that detects a peak frequency that mainly constitutes the background sound from the background sound signal; a carrier-wave generating unit (108) that generates carrier waves of a plurality of frequencies having a masking effect on the background sound on the basis of the peak frequency; and a modulating unit (115) that modulates the plurality of carrier waves using a baseband signal.
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Inventors:
Tomio Takara
Koji Suzuki
Takanari Tsukuma
Maruno Yoshimaru
Okuyama Ichiro
Koji Suzuki
Takanari Tsukuma
Maruno Yoshimaru
Okuyama Ichiro
Application Number:
JP2010513542A
Publication Date:
September 15, 2010
Filing Date:
March 26, 2010
Export Citation:
Assignee:
Field System Co., Ltd.
International Classes:
H04B11/00; G10L19/018
Foreign References:
| WO2007043376A1 | 2007-04-19 | |||
| WO2007043376A1 | 2007-04-19 |
Attorney, Agent or Firm:
Tadashi Aihara