WO2012171183A1

WO2012171183A1 - Electronic scale, mobile device and body weight measurement system and method for wireless transmission

Info

Publication number: WO2012171183A1
Application number: PCT/CN2011/075753
Authority: WO
Inventors: 王任大; 赵然; 尹德胜; 丛明
Original assignee: 天津九安医疗电子股份有限公司; 柯顿（天津）电子医疗器械有限公司
Priority date: 2011-06-15
Filing date: 2011-06-15
Publication date: 2012-12-20

Abstract

An electronic scale is provided. The electronic scale comprises a device body, a body weight measurement unit, a body weight data storage unit, a conversion unit and an audio transmission unit. The conversion unit encodes the weight data in the storage unit by using DTMF audio coding, converts the audio code to corresponding DTMF audio data and then outputs it. The audio transmission unit converts the DTMF audio data outputted by the conversion unit to an audio signal carrying DTMF audio information and then transmits it. A mobile device wirelessly communicated with the electronic scale, a body weight measurement system composed of the electronic scale and the mobile device, and a body weight data wireless transmission method are also provided. The electronic scale avoids the expensive wireless communication module, reduces cost, and ensures the reliability of data transmission.

Description

Electronic scale, mobile device and weight measuring system and wireless transmission method

The present invention relates to an electronic scale, and more particularly to a method of transmitting and receiving measurement data of an electronic scale. Background technique

At present, electronic scales mostly use sensors and single-chip microcomputers to measure the body weight, and display the measurement results through the LCD display, but can not record statistics and further analysis for individual weight measurement results.

To this end, CN201666812 discloses an electronic scale with a wireless interface for wirelessly transmitting data to a computer, and wirelessly uploading weight data to a computer and the Internet via a Bluetooth transceiver or a 2.4G wireless transceiver for personal health data. Permanently save and analyze.

Although the above technical solutions bring certain convenience to the measurer, there are still the following shortcomings in use: It is necessary to increase the communication module, thereby increasing the cost of the product; the device needs to be paired and authenticated during use, which increases the operation difficulty.

In the prior art, DTMF is widely used in the telephone field, but the transmission and reception of DTMF signals are basically based on the telephone network, that is, telephone lines, antennas, electromagnetic waves as carriers, and applications for realizing short-distance data transmission using sound as a medium. . Summary of the invention

The technical problem to be solved by the present invention is to overcome the above-mentioned defects and technical biases in the prior art, and to provide a short-distance wireless transmission and reception method for electronic scale measurement data, and an electronic scale and mobile device for implementing the method, and The weight measurement system consisting of electronic scale and mobile device realizes the management and analysis of measurement data, and the data transmission is reliable, the structure is simple, the cost is low, and the measurement person is brought convenience.

The present invention is achieved by the following technical solution, an electronic scale according to the present invention, comprising: a device body;

a weight measuring module for measuring body weight data;

a storage unit, configured to store the measured weight data;

Among them, it also includes:

a conversion unit, configured to perform DTMF audio encoding on the weight data in the storage unit, convert the data into corresponding DTMF audio data, and output the data;

An audio sending unit, configured to convert DTMF audio data output by the converting unit into sound carrying DTMF audio information The tone signal is sent out.

The invention can also be further realized by the following technical solutions:

In the above electronic scale, the audio transmitting unit includes a blocking circuit, a driving circuit and a speaker connected in sequence, and the blocking circuit is connected to an output end of the converting unit;

In the above electronic scale, wherein the speaker is placed inside the main body of the device and faces the upper surface of the main body of the device, and a corresponding hole is formed in the surface of the main body of the device;

In the above electronic scale, wherein the audio transmitting unit plays a DTMF tone for 55 milliseconds, and sets a silence time of 60 milliseconds to separate two consecutive DTMF tones. Preferably, the audio transmitting unit plays a DTMF tone for 100 milliseconds and sets a silence time of 120 milliseconds to separate two consecutive DTMF tones.

The present invention also provides a mobile device for use with the above electronic scale, comprising an audio receiving unit, a decoding unit and a measurement data storage unit, wherein the audio receiving unit is configured to receive the DTMF audio information transmitted by the electronic scale. And the decoding unit is configured to decode the sound signal that carries the DTMF audio information received by the audio receiving unit, and convert the sound signal into corresponding weight data.

In a preferred embodiment, the mobile device, wherein the mobile device is a mobile phone with a recording function, and the audio receiving unit is a recording unit of the mobile phone;

In the above mobile device, the decoding unit includes:

The decoding program startup module starts the decoding process after receiving the start bit speech, and starts decoding the subsequent audio data;

The audio data decoding module decodes each of the continuous sound signals carrying the DTMF audio information by N times according to a predetermined decoding program to obtain N data;

The valid data judging module determines that the number of the same data obtained by decoding is greater than the preset value M, and determines that the data is valid; the decoding program terminates the module, and when the obtained valid data reaches the specified number of data, the decoding is terminated.

In the above mobile device, when the predetermined decoding procedure is to decode the sound signal carrying the DTMF audio information received by the audio receiving unit, the voice signal carrying the DTMF audio information is first subjected to discrete Fourier transform to obtain the DTMF corresponding frequency point. Gain and 2nd harmonic gain. If the gain of the DTMF corresponding frequency point is lower than the preset threshold or the 2nd harmonic gain exceeds the preset threshold, it is judged that the frequency data is interference data. Otherwise, the frequency is determined as The effective frequency point, the table lookup parses the corresponding value.

The invention also provides a method for wirelessly transmitting weight data, which is applied to a weight measuring system comprising an electronic scale and a mobile device, wherein the method comprises the following steps:

(1) The weight data is encoded by an electronic scale and converted into DTMF audio data; (2) The electronic scale sends the DTMF audio data in the form of a sound signal carrying DTMF audio information;

(3) receiving, by the mobile device, a sound signal carrying DTMF audio information;

(4) Decoding the sound signal carrying the DTMF audio information and converting it into the corresponding weight data.

In a preferred embodiment, the weight data wireless transmission method, wherein, in the step (4), the decoding process specifically includes:

The decoding program starts, starts the decoding process after receiving the start bit speech, starts decoding the subsequent audio data; decodes the audio data, and decodes each continuous DTMF audio data N times according to a predetermined decoding program to obtain N data;

The valid data judges that the number of identical data obtained by decoding is greater than the preset value M, and is determined to be valid data; the decoding process is terminated, and the decoding is terminated when the number of valid data obtained reaches the specified number of data.

In the above method for wirelessly transmitting weight data, wherein the predetermined decoding program is to decode the sound signal carrying the DTMF audio information received by the audio receiving unit, first performing discrete Fourier transform on the sound signal carrying the DTMF audio information to obtain DTMF. Corresponding to the gain of the frequency point and the second harmonic gain, if the gain of the corresponding frequency point of the DTMF is lower than the preset threshold or the second harmonic gain exceeds the preset threshold, the frequency point data is judged to be interference data, otherwise, the judgment is made. The frequency point is the effective frequency point, and the table looks up the corresponding value.

The present invention is a combination of the above-mentioned hardware devices, and a weight measuring system, including an electronic scale and a mobile device, wherein the electronic scale includes:

Device body

a weight measuring module for measuring body weight data;

a storage unit, configured to store the measured weight data;

An audio sending unit, configured to convert DTMF audio data output by the converting unit into a sound signal carrying DTMF audio information and send the sound signal;

The mobile device, comprising: an audio receiving unit, a decoding unit, a measurement data storage unit, the audio receiving unit, configured to receive a sound signal that is sent by the electronic scale and carry DTMF audio information; The sound signal carrying the DTMF audio information received by the audio receiving unit is decoded and converted into corresponding weight data.

In a preferred embodiment, the mobile device is a mobile phone with a recording function, and the receiving unit is a recording unit of the mobile phone. The weight measurement system described above, wherein the decoding unit comprises:

In the above weight measurement system, when the predetermined decoding procedure is to decode the sound signal carrying the DTMF audio information received by the audio receiving unit, the voice signal carrying the DTMF audio information is first subjected to discrete Fourier transform to obtain a DTMF corresponding frequency. Point gain and 2nd harmonic gain. If the gain of the DTMF corresponding frequency point is lower than the preset threshold or the 2nd harmonic gain exceeds the preset threshold, it is judged that the frequency data is interference data, otherwise, the frequency is judged. For the effective frequency, the table looks up the corresponding value.

In summary, with the above structure and method, the present invention has at least the following advantages over the prior art:

The expensive wireless communication module is avoided, the cost is reduced, and the reliability of data transmission is ensured, which brings convenience to the measurer. In the preferred embodiment of the present invention, the wireless communication is realized by using the recording device provided in the mobile phone, and the reliable transmission of data can be realized without increasing the hardware cost. In addition, by performing discrete Fourier transform on the sound signal carrying the DTMF audio information, the gain and the second harmonic gain of the DTMF corresponding frequency point are compared with the respectively set threshold values, and it is determined whether the frequency point data is interference data, and the anti-interference is achieved. purpose. Compared with the traditional application and the DTMF technology in wired telephone communication, the DTMF signal transmission and reception of the present invention is based on sound, and is susceptible to stronger environmental sound and voice interference, by continuously carrying DTMF audio information for each. The sound signal is decoded N times according to a predetermined decoding program, and the number of the same data bits obtained by decoding is greater than the preset value M, and the determination method of the valid data is determined, thereby further improving the anti-interference ability and ensuring the accuracy of decoding. DRAWINGS

1 is a schematic view showing the functional structure of an electronic scale according to the present invention;

2 is a schematic diagram showing the functional structure of a mobile device according to the present invention;

3 is a schematic diagram showing the working principle of wireless communication between the electronic scale and the mobile device according to the present invention;

Figure 4 is a schematic view showing the appearance of the weight measuring system of the present invention;

FIG. 5 is a flow chart of decoding a mobile device according to a preferred embodiment of the present invention. detailed description

The structure, features and functions of the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. As shown in FIG. 1, the present invention provides an electronic scale 100, comprising:

The weight measuring unit 1 is used for measuring body weight data;

a storage unit 2, configured to store the measured weight data;

The converting unit 3 is configured to encode the weight data in the storage unit into the corresponding DTMF audio data, and the audio sending unit 4 is configured to convert the DTMF voice data converted by the converting unit into an audio signal.

Preferably, the above electronic scale, wherein the conversion unit comprises:

a storage subunit 31, configured to store the recorded DTMF audio data;

The encoding unit 32 is configured to convert each digit of the physiological parameter data in the storage unit into a frequency group corresponding thereto, and each frequency group corresponds to a specified DTMF audio data address;

The extracting unit 33 extracts corresponding DTMF audio data according to the specific frequency group converted by the encoding unit.

Preferably, in the aforementioned electronic scale, wherein the audio transmitting unit plays a DTMF tone for 100 milliseconds, and 120 milliseconds of silence is used to separate two consecutive DTMF tones.

As shown in FIG. 2, the present invention further provides a mobile device 200, including:

The audio receiving unit 5 is configured to receive a sound signal that carries the DTMF audio information sent by the weight scale;

The decoding unit 6 is configured to decode the sound signal carrying the DTMF audio information received by the audio receiving unit, and convert the sound signal into corresponding weight data.

The measurement data storage unit 7 is configured to store the weight data converted by the decoding unit;

Preferably, the foregoing mobile device further includes a data processing unit 8 for performing further health analysis on the physiological parameters;

Preferably, the mobile device, wherein the mobile device is a mobile phone with a recording function, and the audio receiving unit is a recording unit 9 of the mobile phone;

Preferably, in the foregoing mobile device, the decoding unit includes:

The decoding program starting module 61 starts the decoding process after receiving the start bit voice, and starts decoding the subsequent audio data;

The audio data decoding module 62 decodes each persistent DTMF audio data N times according to a predetermined decoding time to obtain N data;

The valid data judging module 63 determines that the number of identical data obtained by decoding is greater than the preset value M, and determines that the data is valid; the decoding program termination module 64 terminates when the number of valid data obtained reaches a specified number of data. In the above mobile device, when the predetermined decoding procedure is to decode the sound signal carrying the DTMF audio information received by the audio receiving unit, the voice signal carrying the DTMF audio information is first subjected to discrete Fourier transform to obtain the DTMF corresponding frequency point. Gain and 2nd harmonic gain. If the gain of the DTMF corresponding frequency point is lower than the preset threshold or the 2nd harmonic gain exceeds the preset threshold, it is judged that the frequency data is interference data. Otherwise, the frequency is determined as The effective frequency point, the table lookup parses the corresponding value.

The invention realizes a method for wireless transmission of body weight data by using an electronic scale and a mobile device, comprising the following steps:

(1) The weight data is encoded by an electronic scale and converted into DTMF audio data;

(2) The electronic scale transmits the DTMF audio data in the form of a sound signal carrying DTMF audio information;

(4) The mobile device decodes the sound signal carrying the DTMF audio information and converts it into corresponding weight data.

The following is specifically described below in conjunction with the preferred embodiment:

Referring to Figures 3 and 4, the audio transmitting unit of the present invention includes a portion of the DC blocking circuit 11, the speaker driving circuit 12, and the speaker 13 which are sequentially connected. The recorded DTMF voice file can be stored in the microcontroller 10 (CPU in the figure) in advance, that is, the storage subunit of the aforementioned conversion unit, and the DTMF audio data converted by the conversion unit is output by the 10-port of the single-chip microcomputer, and then transmitted through the audio. The unit converts to a sound signal carrying DTMF audio information and transmits it.

Preferably, the speaker is placed inside the main body of the device and faces the upper surface of the main body of the device, and the corresponding main body surface is provided with a small hole 14; the setting is advantageous for the recording device to perform recording collection.

The specific working principle is as follows (see Figure 4):

Assume that the specified number of transmitted data is N (in this embodiment, the weight data is defined as 4 digits, that is, XXX.X, so the specified number of transmitted data is set to 4);

After receiving the measurement data obtained by the weight measuring unit 1, the single chip microcomputer 10 reads the data into the storage unit 2, runs the conversion program of the conversion unit 3, converts the received data into corresponding DTMF audio data, and then the microcontroller 10 takes the period as The 32 kHz PWM wave transmits data to the DC blocking circuit 11 through 10 ports, and the data is filtered by the DC blocking circuit 11 and transmitted to the speaker driving circuit 12 portion, the data is amplified, and then the sound of the DTMF audio information is carried through the speaker 13. The signal is sent out. Playing a DTMF tone representing a number takes 100 milliseconds, separating two consecutive DTMF tones with a silence of 120 milliseconds duration. Define a DTMF tone as the start bit and play the data bit first before playing the data.

The mobile device 200 of the embodiment of the present invention is a mobile phone. Before the mobile phone receives the mobile phone, the mobile phone needs to open the own recording device 9 , and the mobile phone uses the recording device 9 to receive the voice file. The recording sampling rate is 8KHZ, after receiving the initial bit voice, The data after the recording is started and the decoding process is started, a data window of 136 points is set, and the decoding program 11 decodes the subsequent data.

When the mobile device 200 decodes the received sound signal carrying the DTMF audio information, it first performs discrete Fourier transform on the received sound signal carrying the DTMF audio information, and parses the gain Au and the second harmonic gain Auh of the corresponding frequency point of the DTMF tone. The threshold is set according to the external environment, and if the gain Au exceeds the threshold, it is determined to be valid data. In addition, since the human speech contains rich harmonics, it is very likely that interference occurs at the corresponding frequency of the DTMF tone, and the frequency is judged by judging whether the corresponding frequency of the DTMF tone has a strong second harmonic gain. Whether the point is valid data or voice interference, the threshold is set accordingly. If the harmonic exceeds the set threshold, indicating that the voice is dry from the outside, the point data is discarded. Through this method, the purpose of anti-interference is achieved.

The above decoding is about 17ms, so a DTMF tone lasting 100ms can be decoded to get 5 data bits. If the same data in 3 data is greater than or equal to 3, the data of the DTMF tone that lasts for 100ms is considered to be the same data. This further plays a role in anti-interference. The mobile phone receives the specified number of data (four in this embodiment), stops receiving data, and the decoding is terminated. The specific receiving process is shown in Figure 5. After receiving the data, the data is stored in the measurement data storage unit 7 of the mobile device. The data processing unit 8 of the mobile device can perform secondary processing on the data using specific data processing software, and then transmit it to the user through visual, auditory, etc. through output devices such as a display screen and a speaker.

The time and mute time for playing a DTMF tone are not subject to the above parameters and can be modified. For example, playing a DTMF tone for 55 milliseconds, separating two consecutive DTMF tones with a silence of 60 milliseconds duration data. Define a DTMF tone as the start bit and play the data bit first before playing the data. The mobile device 200 needs to open the recording device 9 before receiving, and the mobile device receives the voice file by using the recording device 9. After receiving the start bit voice, the decoding unit 6 decodes the subsequent data, and the time for decoding one voice data is 17 ms. A DTMF tone lasting 55ms can be decoded to obtain 3 data bits. If the same data in the 3 data is greater than or equal to 2, the data of the DTMF tone that lasts for 55ms is considered to be the same data, further enhancing the anti-interference ability.

This embodiment adopts standard DTMF coding. In actual use, it can also customize non-standard DTMF coding. The coding table is shown in the following table. The first action is high frequency audio and the first column is low frequency audio.

The above is only a preferred embodiment of the present invention, and any simple modifications and equivalent changes to the above embodiments in accordance with the technical solutions of the present invention are within the scope of the present invention.

Claims

Rights request

1. An electronic scale comprising:

Device body

a weight measuring unit for measuring body weight data;

a storage unit, configured to store the measured weight data;

It is characterized in that it further comprises:

And an audio sending unit, configured to convert the DTMF audio data output by the converting unit into a sound signal carrying the DTMF audio information and send the sound signal.

2. The electronic scale according to claim 1, wherein the audio transmitting unit comprises a blocking circuit, a driving circuit and a speaker connected in series, and the blocking circuit is connected to an output end of the converting unit.

3. The electronic scale according to claim 2, wherein the speaker is placed inside the main body of the device and faces the upper surface of the main body of the device, and a corresponding hole is formed in the surface of the main body of the device.

The electronic scale according to any one of claims 1 to 3, wherein the audio transmitting unit plays a DTMF tone for 55 milliseconds, and sets a silence time of 60 milliseconds to separate the two. Continuous DTMF tones.

The electronic scale according to claim 4, wherein the audio transmitting unit plays a DTMF tone for 100 milliseconds, and sets a silence time of 120 milliseconds to separate two consecutive DTMF tones.

A mobile device, comprising: an audio receiving unit, a decoding unit, and a measurement data storage unit, wherein the audio receiving unit is configured to receive a sound signal that is sent by the electronic scale and carries DTMF audio information; And a decoding unit, configured to decode the sound signal that carries the DTMF audio information received by the audio receiving unit, and convert the voice signal into corresponding weight data.

The mobile device according to claim 6, wherein the mobile device is a mobile phone with a recording function, and the audio receiving unit is a recording unit of the mobile phone.

The mobile device according to claim 6, wherein the decoding unit comprises:

An audio data decoding module for performing predetermined decoding on each of the continuous sound signals carrying DTMF audio information The program is decoded N times to obtain N data;

The mobile device according to claim 8, wherein the predetermined decoding procedure is to first decode the sound signal carrying the DTMF audio information when decoding the sound signal carrying the DTMF audio information received by the audio receiving unit. Discrete Fourier transform, obtain the gain of the DTMF corresponding frequency point and the second harmonic gain. If the gain of the corresponding frequency of the DTMF is lower than the preset threshold or the second harmonic gain exceeds the preset threshold, the frequency data is judged as interference. Data, otherwise, judge the frequency point as the effective frequency point, and look up the table to parse the corresponding value.

10. A method for wirelessly transmitting weight data, applied to a weight measuring system comprising an electronic scale and a mobile device, comprising the steps of:

(4) The sound signal carrying the DTMF audio information is decoded by the mobile device and converted into corresponding weight data.

The method for wirelessly transmitting weight data according to claim 10, wherein in step (4), the decoding process specifically comprises:

The decoding program starts, starts the decoding process after receiving the start bit speech, and starts decoding the subsequent audio data; the audio data is decoded, and each of the continuous DTMF audio data is decoded N times according to a predetermined decoding program to obtain N data;

The method for wirelessly transmitting weight data according to claim 11, wherein the predetermined decoding procedure is to first decode the sound signal carrying the DTMF audio information received by the audio receiving unit, and firstly carrying the DTMF audio information. The sound signal is subjected to discrete Fourier transform to obtain the gain of the DTMF corresponding frequency point and the second harmonic gain. If the gain of the DTMF corresponding frequency point is lower than the preset threshold or the second harmonic gain exceeds a preset threshold, the frequency is judged. The data is interference data. Otherwise, it is judged that the frequency is an effective frequency point, and the table is parsed to parse the corresponding value.

13. A weight measuring system comprising an electronic scale and a mobile device, characterized in that

The electronic scale includes:

Device body a weight measuring module for measuring body weight data;

a storage unit, configured to store the measured weight data;

14. The weight measurement system according to claim 13, wherein the mobile device is a mobile phone with a recording function, and the audio receiving unit is a recording unit of the mobile phone.

The weight measurement system according to claim 13 or 14, wherein the decoding unit comprises: a decoding program starting module, starting a decoding process after receiving the start bit speech, and starting decoding the subsequent audio data ;

16. The weight measurement system according to claim 15, wherein the predetermined decoding program is a sound signal carrying DTMF audio information when decoding a sound signal carrying DTMF audio information received by an audio receiving unit. Performing a discrete Fourier transform to obtain a gain and a second harmonic gain of the DTMF corresponding frequency point. If the gain of the DTMF corresponding frequency point is lower than a preset threshold or the second harmonic gain exceeds a preset threshold, the frequency point data is determined as Interfere with the data, otherwise, judge the frequency point as the effective frequency point, and check the table to parse the corresponding value.