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WO2011118017A1 - Service d'envoi - Google Patents

Service d'envoi Download PDF

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Publication number
WO2011118017A1
WO2011118017A1 PCT/JP2010/055334 JP2010055334W WO2011118017A1 WO 2011118017 A1 WO2011118017 A1 WO 2011118017A1 JP 2010055334 W JP2010055334 W JP 2010055334W WO 2011118017 A1 WO2011118017 A1 WO 2011118017A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
frequency
peak frequency
environmental sound
waves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/055334
Other languages
English (en)
Japanese (ja)
Inventor
高良富夫
鈴木浩司
津久間孝成
丸野芳丸
奥山一郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Field System Inc
Original Assignee
Field System Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Field System Inc filed Critical Field System Inc
Priority to JP2010513542A priority Critical patent/JP4545234B1/ja
Priority to PCT/JP2010/055334 priority patent/WO2011118017A1/fr
Publication of WO2011118017A1 publication Critical patent/WO2011118017A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/093—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters using sinusoidal excitation models
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves

Definitions

  • the present invention relates to an information providing system for providing various types of information to a terminal using sound waves, and more particularly to a transmitting device of such an information providing system.
  • Patent Document 1 discloses that information to be transmitted is transmitted as sound through an input / output interface of an acoustic device that handles existing sound by using an information encoding device that converts the information to be transmitted into sound.
  • the information transmission system reproduces the transmission target information based on the voice received by the information decoding apparatus.
  • an encoding method is employed that aims to produce comfortable music in which sounds including encoded information can be actively heard by humans.
  • Patent Documents 2 and 3 were developed by the present inventors and encode various information as data frames in milliseconds including a preamble for synchronizing timing. Thus, information is provided as sound waves.
  • the information providing system disclosed in Patent Document 4 was also developed by the present inventors, and when transmitting various types of information as sound pressure vibration information, the transmission frequency is defined as the gap between the sounds of the average rate scale. This is the frequency.
  • JP 2003-186500 A Japanese Patent No. 3822224 Japanese Patent No. 3833579 Japanese Patent No. 4295781
  • the sound wave for transmitting information is an audible sound. May be heard.
  • a sound wave for transmitting information is transmitted in the store, there is a possibility that a customer who feels uncomfortable may leave the store.
  • the present invention has been made in view of such a problem, and in an environment where information is transmitted as sound waves, a transmission device capable of making it difficult for human ears to perceive sound waves for transmitting information.
  • the purpose is to provide.
  • a transmitting device is a transmitting device that converts various encoded information into sound waves in an audible sound band and transmits the sound.
  • a microphone input as a sound signal, a peak frequency detector for detecting a peak frequency mainly constituting the environmental sound from the environmental sound signal, and a masking effect on the environmental sound based on the peak frequency can be obtained.
  • a carrier generation unit that generates a carrier wave having a plurality of frequencies, and a modulation unit that modulates the plurality of carrier waves with a baseband signal.
  • the transmission program according to the present invention is a transmission program for causing a computer to convert various encoded information into sound waves of an audible sound band and transmitting the sound from a speaker.
  • the sound waves input via a microphone are transmitted.
  • a peak frequency detecting step for detecting a peak frequency mainly constituting the environmental sound from a signal of the environmental sound at a place to be performed, and a plurality of frequencies for obtaining a masking effect on the environmental sound based on the peak frequency.
  • a carrier generation step for generating a carrier wave and a modulation step for modulating the plurality of carrier waves with a baseband signal are executed by the computer.
  • a transmitter capable of transmitting a sound wave for transmitting information as a sound hardly perceived by a human ear.
  • FIG. 1 is a schematic diagram schematically showing a configuration of an information providing system according to the present embodiment.
  • FIG. 2 is a block diagram showing a conceptual circuit for realizing a function of generating a sound code in the transmission device according to the present embodiment.
  • FIG. 3 is a diagram for explaining the masking effect on the sound code by the environmental sound according to the present embodiment.
  • FIG. 4 is a block diagram showing a conceptual circuit for realizing a function of receiving a sound code in the mobile phone according to the present embodiment.
  • the information providing system transmits various information such as messages and URLs as sound waves using air as a medium from the transmitting device to the receiving device, and the transmitting device transmits and receives sound waves from the speaker.
  • the device recognizes the transmitted information by receiving and decoding the sound wave with the microphone.
  • the environmental sound existing at the place where the transmitting device and the receiving device are installed that is, the place where sound pressure vibration information (hereinafter referred to as “sound code”) is transmitted is considered.
  • a sound code is transmitted using a carrier wave.
  • the environmental sound is sound around a place where a system such as ambient noise such as car or train sound or wind sound, human voice or music is installed.
  • FIG. 1 is a diagram schematically showing a configuration of an information providing system 1 according to the present embodiment.
  • the information providing system 1 includes a transmitting device 10 that transmits various information as a sound code, and a mobile phone 20 as a receiving device that receives the sound code.
  • a transmitting device 10 includes a PC (personal computer) main body 11, a display 12 serving as display means, an input device 13 including a mouse and a keyboard, a speaker 15 for transmitting a sound code as sound, and a microphone for inputting environmental sound. 16 is provided.
  • the PC body 11 includes an arithmetic device such as a processor for performing various calculations, an HDD (Hard Disc Drive) for storing various information such as programs, and a RAM (Random) used as a work area for arithmetic processing. It has a built-in storage device such as Access Memory.
  • the mobile phone 20 includes a microphone 21 for picking up a sound code transmitted from the speaker 15 and a display 22 for displaying various information.
  • the mobile phone 20 has a built-in memory that stores various types of information such as an arithmetic device such as a processor for performing various calculations and a program, and is used as a work area for arithmetic processing.
  • the transmitting device 10 of the information providing system 1 described above is installed in a commercial facility such as a department store, a supermarket, a shopping street, a movie theater, an amusement park, an amusement facility, or the like.
  • the mobile phone 20 that is a receiving device is assumed to be a terminal owned by a user who has visited such a facility. Information can be obtained.
  • the place where the transmitting device 10 is installed is up to the information provider, and may be installed in another place as appropriate.
  • the content of the provided information is not limited to character information, and image information or the like may be provided.
  • FIG. 2 is a block diagram showing a conceptual circuit for realizing a function of generating a sound code in the transmission device according to the present embodiment.
  • OFDM Orthogonal Frequency Division
  • a modulated wave is generated by a Multiplexing method.
  • each unit shown in FIG. 2 is realized by software by the calculation means of the transmission device 10 executing a program stored in the storage device, but it is dedicated for performing such processing.
  • a circuit may be provided and realized in hardware.
  • the transmitting device 10 includes an A / D converter 103, an FFT (Fast Fourier transform) section 104, peak frequency detection section 107, carrier wave generation section 108, modulation section 115, and D / A conversion section 120.
  • FFT Fast Fourier transform
  • the A / D conversion unit 103 converts the analog electrical signal of the environmental sound 101 input from the microphone 16 of the transmission device 10 into a digital signal.
  • the environmental sound 101 is a sound that exists in the environment where the transmission device 10 is installed. For example, noise such as a train, a car, and a wind sound corresponds to the environmental sound.
  • the FFT unit 104 converts a signal on the time axis into a signal on the frequency axis by fast Fourier transform.
  • the peak frequency detection unit 107 detects the frequency having the highest sound pressure level from the components on the frequency axis of the environmental sound signal, and determines the peak frequency fp mainly constituting the environmental sound.
  • the detection of the peak frequency fp by the peak frequency detection unit 107 is performed prior to the transmission of the sound code 150, and in this embodiment, the sound pressure level is obtained by repeatedly acquiring environmental sounds 10 times in units of 10 ms and integrating them. To detect the peak frequency fp.
  • the carrier wave generation unit 108 generates a plurality of carrier waves by a PLL (Phase locked Loop) circuit based on the peak frequency fp.
  • PLL Phase locked Loop
  • the modulation unit 115 performs modulation by the OFDM method, and modulates the plurality of carrier waves generated by the carrier wave generation unit 108 with a baseband signal converted in parallel to generate an original signal of the sound code 150. Specifically, the modulation unit 115 modulates each carrier wave by QPSK (Quadrature phase shift keying) based on each parallel transmission bit of the parallel bit stream, and then performs fast inverse Fourier transform (IFFT). Generate a signal.
  • QPSK Quadratture phase shift keying
  • IFFT fast inverse Fourier transform
  • the D / A conversion unit 120 converts the modulation signal from the modulation unit 115 into an analog signal and transmits the analog signal to the speaker 15. This analog signal is transmitted from the speaker 15 as a sound code 150 that is a sound wave.
  • the environmental sound 101 input from the microphone 16 is digitally converted by the A / D conversion unit 103.
  • the digital signal of the environmental sound 101 is fast Fourier transformed in the FFT unit 104, and the signal on the time axis is converted into a signal on the frequency axis.
  • the peak frequency detection unit 107 detects the frequency having the highest sound pressure level from the components on the frequency axis of the environmental sound signal, and sets it as the peak frequency fp mainly constituting the environmental sound. Subsequently, the carrier wave generation unit 108 uses a frequency in the vicinity of 100 Hz out of 1 / n (n is a natural number) of the peak frequency fp as a fundamental frequency, which is 64 times a natural number multiple (1 to 64 times) of the fundamental frequency. Subcarriers (carrier waves) are generated.
  • the carrier wave generation unit 108 determines the fundamental frequency to be 100 Hz, and generates a carrier wave having a frequency that is 4 to 67 times, that is, frequencies of 400 Hz, 500 Hz, 600 Hz, 700 Hz,..., 6,600 Hz, 6,700 Hz.
  • the modulation unit 115 modulates the plurality of carrier waves with the baseband signal converted in parallel to generate a modulated signal.
  • This modulated signal is converted into an analog signal by the D / A converter 120 and transmitted as a sound code 150 from the speaker 15.
  • CDMA collision Detection Multiple Multiple Access
  • the transmitting device 10 that transmits the sound code 150 has been described in detail above, but the plurality of carrier waves of the sound code 150 have a frequency that is a natural number multiple of the fundamental frequency, and are therefore orthogonal to each other. Therefore, it can be decomposed into carrier waves on the receiving device side. Further, the frequency interval of the plurality of carrier waves is 100 Hz, and a sufficient number of carrier waves can be used in the audible sound band.
  • the peak frequency fp of the environmental sound is detected, and a plurality of carrier waves are generated based on the peak frequency fp, and the sound code 150 composed of such carrier waves is superimposed on the environmental sound.
  • the sound is difficult to perceive by the human ear due to the masking effect by the environmental sound.
  • the plurality of carriers are present over a wide range (400 to 6,700 Hz) of the audible sound band at intervals of 100 Hz, and the sound code 150 has frequency components such as white noise. Therefore, the sound of the sound code 150 is a sound that is easy to adjust to the environmental sound and is difficult to perceive by the human ear.
  • FIG. 3 is a diagram for explaining the masking effect on the sound code by the environmental sound according to the present embodiment.
  • the horizontal axis indicates the frequency [kHz]
  • the vertical axis indicates the masking amount [dB].
  • the solid line in the figure shows the amount of masking by pure tone with a frequency of 400 Hz and a sound pressure level of 80 dB SPL.
  • the audible limit is expressed as a sensory level when there is no masking sound.
  • the second sound is masked and only the first sound (pure sound) can be heard.
  • the alternate long and short dash line in the figure shows the masking amount when the masking sound is 80 dB narrowband noise (noise) having a bandwidth of 90 Hz with 410 Hz as the center frequency.
  • the masking effect is obtained in a wide range of both low and high sounds from the center frequency of the noise. Therefore, as in the present embodiment, a sufficient masking effect can be obtained even with a plurality of carrier waves that exist over a wide range of the audible sound range.
  • the masking effect is increased in the vicinity of the frequency (overtone) that is a natural number multiple of the first sound (pure tone). Therefore, as in this embodiment, if 1 / n of the peak frequency of the environmental sound is set as a fundamental frequency and a carrier wave having a frequency 1 to 64 times is used, a harmonic with a large masking effect (a natural number multiple of the peak frequency). (Sound of frequency) is used as a carrier wave, and a larger masking effect can be obtained.
  • the fundamental frequency obtained by setting the peak frequency to 1 / n is not limited to the vicinity of 100 Hz, and maintains the interval between carriers capable of multi-carrier and the required number of bands over a certain range in the audible sound band. Any frequency that can secure a carrier wave may be used. In order to satisfy such a condition, the fundamental frequency is preferably within a range of 30 to 260 Hz.
  • the carrier wave is generated by using the PLL circuit, but it may be generated by a circuit other than the PLL circuit.
  • the number of carrier waves can be changed as appropriate according to the amount of data to be transmitted. When pilot signals or the like are input, the number of carrier waves may be further increased. However, it is desirable that the frequency of the carrier wave be in the range of 400 Hz to 12 kHz in consideration of the frequency characteristics of the speaker 15 and the microphone 22.
  • the peak frequency fp does not necessarily have to be the frequency of the maximum sound pressure.
  • the peak frequency fp has a certain size among the frequency components constituting the environmental sound, and is a frequency mainly constituting the environmental sound together with other frequency components. I just need it. This is because, if the fundamental frequency is determined based on the frequency components mainly constituting the environmental sound, a sufficient masking effect can be obtained. Further, the detection timing and the number of times of the peak frequency fp by the peak frequency detection unit 107 can be changed as appropriate.
  • a preset frequency may be determined as the peak frequency. For example, 880 Hz (ra sound) and 1,047 Hz (fa sound) may be used as the set frequency.
  • the modulation method in the modulation unit 115 is not limited to QPSK, and other modulation methods such as BPSK, 8PSK, OQPSK (Offset QPSK), 16QAM, and 64QAM can be used.
  • other modulation methods such as BPSK, 8PSK, OQPSK (Offset QPSK), 16QAM, and 64QAM can be used.
  • PSK phase displacement modulation
  • the speaker 15 may be installed in a place away from the PC main body 11.
  • the microphone 16 needs to be installed at the same location as the speaker 15 in order to measure the environmental sound where the sound code 150 is transmitted.
  • FIG. 4 is a block diagram showing a conceptual circuit for realizing a function of receiving a sound code in the mobile phone according to the present embodiment. Note that the function of each unit shown in FIG. 4 is realized by software by the calculation means of the mobile phone 20 executing a program stored in the storage device, but for performing such processing. A dedicated circuit may be provided and realized in hardware.
  • the mobile phone 20 includes an A / D conversion unit 203, an FFT unit 204, an environmental sound storage unit 210, an environmental sound subtraction unit 213, and a demodulation unit 215.
  • the environmental sound accumulation unit 210 accumulates an environmental sound signal in a state where no sound code exists for a predetermined time.
  • the environmental sound subtracting unit 213 extracts a sound code component by subtracting the environmental sound signal accumulated in the environmental sound accumulating unit 210 from the environmental sound on which the sound code is superimposed. That is, the environmental sound accumulation unit 210 and the environmental sound subtraction unit 213 perform adaptive noise reduction processing.
  • the demodulator 215 demodulates each carrier wave that has been Fourier-transformed and decomposed. In this embodiment, the sound code is QPSK-modulated, and the demodulator 215 demodulates using the QPSK method.
  • the sound picked up by the microphone 21 of the mobile phone 20 is sent to the A / D converter 203.
  • the A / D conversion unit 203 samples the input analog signal and converts it into a digital signal, and the digital signal is transmitted to the FFT unit 204.
  • the FFT unit 204 performs fast Fourier transform to convert the digital signal into a component on the frequency axis.
  • the environmental sound storage unit 210 stores the environmental sound signal that is the output of the FFT unit 203 for a predetermined time prior to the reception of the sound code. Thereafter, when an environmental sound on which the sound code 150 is superimposed is input, the FFT unit 204 converts it into a signal on the frequency axis. Subsequently, the environmental sound subtracting unit 213 subtracts the environmental sound signal accumulated in the environmental sound accumulating unit 210 from the received signal on the frequency axis, and the sound code component, that is, the signal component transmitted from the transmitting device 10 is obtained. Extracted.
  • the sound code component is input to the demodulator 215.
  • the demodulator 215 demodulates each carrier wave on the frequency axis by the QPSK method, and converts it into a serial signal in the same order as at the time of transmission. Thereby, a baseband signal, that is, various information can be extracted.
  • the frequency at which the masking effect is obtained for the environmental sound based on the peak frequency of the environmental sound is used as the sound code transmission frequency.
  • the sound code can be avoided from being annoying to the human ear.
  • the terminal on the receiving side is not limited to a mobile phone, and any terminal provided with a microphone may be used.
  • the terminal on the receiving side is not limited to a mobile phone, and any terminal provided with a microphone may be used.
  • it may be a PDA, an IC recorder, a portable radio, a portable television, a notebook computer, a radio cassette, a game machine, or the like.
  • a dedicated terminal for applying the present invention may be provided.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computational Linguistics (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Telephone Function (AREA)

Abstract

L'invention concerne un dispositif d'envoi permettant de rendre difficile pour les personnes de percevoir des ondes sonores destinées à transmettre des informations dans un environnement dans lequel les informations sont transmises sous forme d'ondes sonores. Plus particulièrement, l'invention concerne un dispositif d'envoi (10) qui convertit diverses informations codées en ondes sonores, qui comprend un microphone (16) auquel un son en arrière-plan au niveau d'un site où les ondes sonores sont envoyées est entré comme signal son en arrière-plan; une unité de détection de fréquence de crête (107) qui détecte une fréquence de crête qui constitue principalement le son en arrière-plan du signal son en arrière-plan; une unité de production d'onde porteuse (108) qui produit des ondes porteuses de plusieurs fréquences possédant un effet de masque sur le son en arrière-plan sur la base de la fréquence de crête, et une unité de modulation (115) qui module ces ondes porteuses au moyen d'un signal de bande de base.
PCT/JP2010/055334 2010-03-26 2010-03-26 Service d'envoi Ceased WO2011118017A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010513542A JP4545234B1 (ja) 2010-03-26 2010-03-26 発信装置
PCT/JP2010/055334 WO2011118017A1 (fr) 2010-03-26 2010-03-26 Service d'envoi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/055334 WO2011118017A1 (fr) 2010-03-26 2010-03-26 Service d'envoi

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WO2011118017A1 true WO2011118017A1 (fr) 2011-09-29

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PCT/JP2010/055334 Ceased WO2011118017A1 (fr) 2010-03-26 2010-03-26 Service d'envoi

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WO (1) WO2011118017A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013141054A (ja) * 2011-12-28 2013-07-18 Spotlight Inc ビーコン、携帯端末を利用する超音波通信システム
JP2016212315A (ja) * 2015-05-12 2016-12-15 日本電信電話株式会社 音響電子透かしシステム、電子透かし埋め込み装置、電子透かし読み取り装置、その方法及びプログラム
JPWO2014104285A1 (ja) * 2012-12-28 2017-01-19 株式会社スポットライト 超音波通信システム

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043376A1 (fr) * 2005-10-07 2007-04-19 Ntt Docomo, Inc. Dispositif et procédé de modulation, dispositif et procédé de démodulation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007043376A1 (fr) * 2005-10-07 2007-04-19 Ntt Docomo, Inc. Dispositif et procédé de modulation, dispositif et procédé de démodulation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013141054A (ja) * 2011-12-28 2013-07-18 Spotlight Inc ビーコン、携帯端末を利用する超音波通信システム
JPWO2014104285A1 (ja) * 2012-12-28 2017-01-19 株式会社スポットライト 超音波通信システム
JP2016212315A (ja) * 2015-05-12 2016-12-15 日本電信電話株式会社 音響電子透かしシステム、電子透かし埋め込み装置、電子透かし読み取り装置、その方法及びプログラム

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JPWO2011118017A1 (ja) 2013-07-04
JP4545234B1 (ja) 2010-09-15

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