JP2002354059A - Communication method between terminals with properties of sound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize radio communication between near terminals with the properties of sound. SOLUTION: Data is sent as tones by changing it depending upon data sending the composition of the frequency of overtone elements to distinguish it every one attenuation sound in a receiving part to check overtone frequency elements included in received tones to identify data for communication in a PCM(Pulse Code Modulation) wave shape with attenuation consisting of fundamental tone frequency and the SIN curve of the frequency of the overtone elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication method between communication terminals in a short distance.

[0002]

2. Description of the Related Art As a conventional wireless communication method between short-range terminals, infrared rays, light, and the like are used.

[0003] However, such communication cannot be performed if there is an obstacle between two terminals, for example, communication becomes impossible.
Some parts are inferior to information transmission by human voice.

[0004]

A problem to be solved is to provide a wireless communication method utilizing sound characteristics between a plurality of terminals.

[0005]

As a communication method using sound, a communication terminal has a speaker that emits sound and a microphone that listens to sound, and is configured by a combination of a fundamental frequency and a SIN curve corresponding to a double sound thereof during data transmission. PCM data that is an attenuated sound is generated and emitted from the speaker.

At the time of data reception, the sound received by the microphone
The data is converted to CM data, the frequency is analyzed for each attenuated sound, and the data is read by checking the harmonic components included in the timbre.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a communication processing unit of a system according to the present communication system. In this communication method, data is created and identified by PCM data processing between the main processing unit (0), the output unit (4), and the input unit (5). The fundamental frequency used for communication in the present communication method is determined in advance on the transmitting side and the receiving side, and in this embodiment, it is assumed to be 300 Hz.

FIG. 2 shows a method of creating PCM data at the time of transmission according to the present embodiment. At the time of data transmission, a plurality of harmonic frequencies to be added are determined according to the data to be transmitted by the harmonic component selection section (1). For example, if 8-bit ASCII data is A
When (41 Hex) is sent, the fundamental frequency is set to 300 Hz, and the harmonic components are applied in order from the lower order bit to obtain 60 Hz.
0Hz on, 900Hz off, 1200Hz off, 15
00Hz off, 1800Hz off, 2100Hz off,
It has a format such as 2400 Hz on and 2700 Hz off.

The fundamental frequency (3) is always output at a constant level in the frequency synthesizing unit (2), and the harmonic component selected by the harmonic component selecting unit (1) is 0 when OFF, and the fundamental frequency when ON. The SIN curves of the attenuated sounds having the maximum level due to the quantization output at the same level as the above are synthesized, and PCM data is sequentially created.

The created PCM data is sequentially output to the output unit (4).
To play the sound after a certain period.

FIG. 3 shows a PCM data processing method at the time of reception according to the present embodiment. At the time of data reception, the PCM data received by the input unit (5) is analyzed in frequency by the timbre analysis unit (6), and data is identified by examining harmonic components. For example, if the fundamental frequency is 300 Hz, 300 Hz, 6
When 00 Hz and 2400 Hz are output, it is considered that bits 0 and 6 are on and the other bits are off, and the data becomes A (41 Hex) in ASCII data.

By using an attenuated sound as the timbre to be data, it is possible to determine the same continuous data by examining the attenuation of the sound in the PCM data at the time of reception.

The fundamental frequency of 300 Hz is used to check the validity of data, and only data having the fundamental frequency output is received as valid data.

If the overtone component added in this method is set to 1 and the overtone component not added is set to 0, 8-bit data can be expressed by using up to the 9th harmonic frequency. For example, if the fundamental frequency is 300 Hz, 2700 Hz , And does not require expensive devices in the transmission unit and the reception unit. Further, when the number of types of data to be identified is further limited, communication is possible in a narrower frequency range.

[0016] Communication by sound can be noise,
Since this method uses the fundamental frequency and harmonic components,
Since data communication between terminals is performed by changing the tone,
It doesn't sound harsh.

[0017]

As described above, in this system, since data is transmitted and received by sound, the field of application is limited to low-speed communication in a place where the distance between fixed or low-speed moving terminals is short and noise is small. However, communication is possible even if a shield exists, and not only one-to-one communication between communication terminals but also one-to-many communication becomes possible.

From the above conditions, it is considered that the field in which the communication according to the present method can be utilized is effective for transmitting information between robots in a relatively quiet environment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the present communication system.

FIG. 2 is a diagram illustrating a method of creating PCM data for one data at the time of transmission.

FIG. 3 is a diagram illustrating a method of reading one data from PCM data at the time of reception.

[Explanation of symbols]

Reference Signs List 0 Main processing unit of communication terminal 1 Overtone component selecting unit constituting harmonic components for identifying data 2 SIN curve synthesizing unit for creating PCM data waveform 3 Fundamental frequency of output sound 4 Sound data output unit 5 Sound data Input unit 6 Tone analysis unit for checking the constituent frequencies

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[Procedure amendment]

[Submission date] July 10, 2001 (2001.7.1)
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The created PCM data includes a plurality of 0s and one
A leading pattern consisting of FF (Hex) is added to the beginning.
Then, the output unit (4) sequentially reproduces sound for each data at a fixed period.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

FIG . 4 is a diagram illustrating a reception used in the present embodiment.
A method for creating bell correction data will be described. The receiving unit
One non-zero value following two or more zeros in the communication level
Is recognized during the reception of data indicating
Check the output level of each bit in other data
The check order is determined in order from the bit with the highest output level.
The output level ratio of each bit in order of output level
Saved as a ratio in the level correction data (7) and received thereafter
Check the maximum output frequency level of the selected data
For each speaker position.
Compensate for changes in frequency level. This bit order and complement
The positive ratio is calculated from the frequency of the maximum output level of the received tone.
The value obtained by multiplying the output frequency by the correction ratio integrated in bit order
Depends on whether the power exceeds 50% of the maximum output level.
Used to determine the on / off status of the unit. For example
In the correction data shown in FIG.
In the case of x), the maximum output level indicates bit 0 of rank 2
Recorded at 600 Hz.
The output level of 1500 Hz x 1.09, bit 7
Check is 2700 Hz output level x 1.09 x 1.
15, check bit 6 is 2400Hz output level
Correction is performed as × 1.09 × 1.15 × 1.07,
Judge by comparing with 50% value of 600Hz output level
You.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

The timbre used as data is to use a damped sound.
The sound attenuation in PCM data at the time of reception
This makes it possible to determine continuous identical data. Ma
The fundamental frequency of 300 Hz is used to check the validity of the data, and only data for which the fundamental frequency is output is received as valid data.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] Fig. 4

[Correction method] Added

[Correction contents]

FIG. 4 is a diagram showing a method of creating data for level correction from FF (Hex) data in a preceding pattern.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 0 Main processing unit of communication terminal 1 Overtone component selection unit constituting harmonic components for identifying data 2 SIN curve synthesis unit for creating PCM data waveform 3 Fundamental frequency of output sound 4 Sound data Output unit 5 Sound data input unit 6 Tone analysis unit 7 for checking constituent frequencies Data used for level correction of received tones

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Added

[Correction contents]

FIG. 4

Claims (2)

[Claims] A communication method for a communication terminal, wherein a tone color obtained by combining a fundamental tone frequency and frequencies of a plurality of harmonic components thereof is used, and data is identified by a configuration of a harmonic component included in the tone color. 2. A method for determining individual data by using an attenuated sound in wireless data communication using sound.