CN110875783A - Ultrasonic communication method - Google Patents

Abstract

The invention discloses an ultrasonic communication method, which adopts 12000Hz sound frequency as carrier wave, and modulates the code in an amplitude modulation mode, firstly, the byte to be sent is coded according to the preset rule at a signal transmitting end, and the coded signal is played out in an ultrasonic mode through a loudspeaker; then, the receiving end carries out band-pass filtering, amplification, demodulation and low-pass filtering on the received modulated signal in sequence to restore the coded signal and decode the coded signal. A communication mode based on sound waves is developed by utilizing an audio power amplifier of a mobile phone, namely, a mode of modulating information to sound frequencies for transmission is adopted, and the mode is convenient to use and saves cost. The method is suitable for network access setting of new intelligent home network access equipment, and is simple and stable and reliable in data transmission.

Description

Ultrasonic communication method

Technical Field

The invention belongs to the technical field of communication, and particularly relates to an ultrasonic communication method.

Background

Under the trends of urbanization, housing estate and intellectualization, the internet of things smart home has huge market potential. At present, compared with developed countries, the urbanization proportion of China is still low, and the urbanization rate of China still has a rising space. China actively promotes the urbanization process, guides population to flow reasonably and orderly, further strengthens the construction of urban infrastructure, promotes the comprehensive bearing capacity of cities, and further improves the urbanization level. Therefore, the smart home has a wide prospect both under the tide of the Internet of things and in the construction of smart cities, and has huge market potential.

The current internet of things technology is a technology with relatively high heat, smart homes based on the internet of things are developing towards functions of wireless remote control, multimedia control, high-speed data transmission and the like, and key technologies of the technology are home controllers with high compatibility and home networks meeting information transmission requirements. At present, a transmission network mostly adopts a comprehensive wiring technology, so that the application places of the system are limited, and the cost is higher. A flexible and convenient intelligent home system is constructed in a wireless mode, and becomes a current research hotspot.

However, in the field of smart home, data transmission modes of infrared, bluetooth and WIFI are mostly adopted, and such a mode has many advantages in the application process, but in the configuration process of new equipment accessing to the network, there are many inconveniences, and during the configuration of accessing to the network, a point-to-point mode is adopted, and a sending end needs to disconnect from the networking equipment, and can configure the new equipment, so that the problems of low configuration efficiency and easy occurrence of errors exist. The new intelligent electrical appliance is not only inconvenient but also increases the equipment cost in the configuration process.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the ultrasonic communication method is provided, the ultrasonic communication is applied to network access configuration of new intelligent household equipment or modification control of original equipment data in the network, and the problems of low network distribution efficiency and poor accuracy of the communication mode in the prior art are solved.

The invention adopts the following technical scheme for solving the technical problems:

an ultrasonic communication method adopts 12000Hz sound frequency as carrier wave, and adopts amplitude modulation mode to modulate code, which comprises the following steps:

firstly, coding bytes to be sent at a signal transmitting end according to a preset rule, and playing coded signals in an ultrasonic mode through a loudspeaker;

then, the receiving end carries out band-pass filtering, amplification, demodulation and low-pass filtering on the received modulated signal in sequence to restore the coded signal and decode the coded signal.

The preset coding rule is as follows:

the high level of n periods and the low level of n periods represent coding '0';

the high level of n cycles and the low level of 2n cycles represent the code '1';

the high level of n cycles and the low level of greater than or equal to 3n cycles represents the start of a new byte, where n is a positive integer.

n>＝3。

The coded signal is played by calling a sound card to drive, and modulated ultrasonic waves are generated.

The coded signal is a char type array.

After receiving the ultrasonic wave, the receiving end obtains a coding signal through processing, outputs the coding signal to an IO port of the processor, and resets the timer after the processor stores the value of the timer at the moment on the rising edge of the IO port and times again;

and the receiving end decodes the received coded signal according to the value of the timer.

The rules for decoding at the receiving end are:

the code value is 0 when the value of the timer <2.5nT, 1 when the value of the timer <3.5nT, and the start of a new byte when the value of the timer >3.5nT, where T is the period of the sound wave.

The transmitting terminal is an audio power amplifier module of a mobile phone or a flat plate.

Compared with the prior art, the invention has the following beneficial effects:

1. a communication mode based on sound waves is developed by utilizing an audio power amplifier of a mobile phone, namely, a mode of modulating information to sound frequencies for transmission is adopted, and the mode is convenient to use and saves cost.

2. And a simple and clear data communication protocol is adopted, so that the data transmission efficiency and accuracy are improved, and resources occupied in the encoding and decoding process are reduced.

3. The ultrasonic communication method is suitable for the network access setting of the new network access equipment of the intelligent home, the original network of the handheld terminal is not required to be disconnected, the parameters can be transmitted to the new equipment, the method is simple, and the data transmission is stable and reliable.

Drawings

FIG. 1 is a waveform diagram of an original sound signal according to the present invention.

Fig. 2 is a waveform diagram of the signal amplified and detected by the receiving end of the present invention.

FIG. 3 is a diagram of the encoded waveforms restored by low pass filtering according to the present invention.

Detailed Description

The structure and operation of the present invention will be further described with reference to the accompanying drawings.

The technical scheme of the invention mainly aims at the network access configuration consideration of the new intelligent household equipment, and the specific thought is as follows: a newly bought intelligent electric appliance can be accessed to a local WIFI network only by configuring parameters, and the configuration process is realized by adopting the traditional Bluetooth technology and the infrared technology, so that the inconvenience is brought and the equipment cost is increased. At present, almost one mobile phone is used, and the scheme is that a communication mode based on sound waves, namely a mode of modulating information to sound frequencies for transmission, is developed based on an audio power amplifier of the mobile phone, so that the mode is convenient to use and saves cost.

The specific technical scheme is as follows:

an ultrasonic communication method adopts 12000Hz sound frequency as carrier wave, and adopts amplitude modulation mode to modulate code, which comprises the following steps:

firstly, coding bytes to be sent at a signal transmitting end according to a preset rule, and playing coded signals in an ultrasonic mode through a loudspeaker;

then, the receiving end carries out band-pass filtering, amplification, demodulation and low-pass filtering on the received modulated signal in sequence to restore the coded signal and decode the coded signal.

The preset coding rule is as follows:

the high level of n periods and the low level of n periods represent coding '0';

the high level of n cycles and the low level of 2n cycles represent the code '1';

the high level of n cycles and the low level of greater than or equal to 3n cycles represents the start of a new byte, where n is a positive integer.

The rules for decoding at the receiving end are:

the code value is 0 when the value of the timer <2.5nT, 1 when the value of the timer <3.5nT, and the start of a new byte when the value of the timer >3.5nT, where T is the period of the sound wave.

n is a positive integer of 3 or more.

In the first embodiment, as shown in fig. 1, fig. 2, and fig. 3:

an ultrasonic communication method adopts 12000Hz sound frequency as carrier wave, and adopts amplitude modulation mode to modulate code, which comprises the following steps:

step 1, setting a high level of 3 periods and a low level of 3 periods to represent coding '0', a high level of 3 periods and a low level of 6 periods to represent coding '1', a high level of 3 periods and a low level greater than or equal to 9 periods to represent the start of a new byte;

step 2, the transmitting end applies the coding rule set in the step 1 to code the bytes to be transmitted, and the coded signals are char type arrays;

step 3, calling a sound card drive to play the coded signals through a loudspeaker to generate modulated ultrasonic waves;

step 4, the receiving end carries out band-pass filtering on the received ultrasonic waves;

step 5, amplifying and detecting the signal after the band-pass filtering;

step 6, performing low-pass filtering processing on the amplified and detected signals to obtain square wave signals, and restoring coded char array signals;

step 7, the receiving end outputs the coded signal to an IO port of the processor, and on the rising edge of the IO port, the processor resets the timer after saving the value of the timer at the moment and times again;

and 8, decoding the received coded signal by the receiving end according to the value of the timer, wherein the code value is 0 when the value of the timer is less than 7.5T, the code value is 1 when the value of the timer is less than 10.5T, and the code value is the start of a new byte when the value of the timer is more than 10.5T, wherein T is the period of the sound wave.

The transmitting terminal is an audio power amplifier module of a mobile phone or a flat plate.

The transmitting end is a mobile phone and a flat audio power amplifier module, and the receiving end is newly-networked intelligent home equipment.

In a second embodiment of the present invention, a second,

an ultrasonic communication method adopts 12000Hz sound frequency as carrier wave, and adopts amplitude modulation mode to modulate code, which comprises the following steps:

step 1, setting a high level of 4 periods and a low level of 4 periods to represent coding '0', a high level of 4 periods and a low level of 8 periods to represent coding '1', a high level of 4 periods and a low level greater than or equal to 12 periods to represent the start of a new byte;

step 2, the transmitting end applies the coding rule set in the step 1 to code the bytes to be transmitted, and the coded signals are char type arrays;

step 3, calling a sound card drive to play the coded signals through a loudspeaker to generate modulated ultrasonic waves;

step 4, the receiving end carries out band-pass filtering on the received ultrasonic waves;

step 5, amplifying and detecting the signal after the band-pass filtering;

step 6, performing low-pass filtering processing on the amplified and detected signals to obtain square wave signals, and restoring coded char array signals;

step 7, the receiving end outputs the coded signal to an IO port of the processor, and on the rising edge of the IO port, the processor resets the timer after saving the value of the timer at the moment and times again;

and 8, decoding the received coded signal by the receiving end according to the value of the timer, wherein the code value is 0 when the value of the timer is less than 10T, the code value is 1 when the value of the timer is less than 14T, and the code value is the start of a new byte when the value of the timer is greater than 14T, wherein T is the period of the sound wave.

Claims (8)

1. An ultrasonic communication method, characterized by: the method adopts 12000Hz sound frequency as carrier wave, and modulates the code in an amplitude modulation mode, and comprises the following specific steps:

firstly, coding bytes to be sent at a signal transmitting end according to a preset rule, and playing coded signals in an ultrasonic mode through a loudspeaker;

then, the receiving end carries out band-pass filtering, amplification, demodulation and low-pass filtering on the received modulated signal in sequence to restore the coded signal and decode the coded signal.

2. The ultrasonic communication method according to claim 1, characterized in that: the preset coding rule is as follows:

the high level of n periods and the low level of n periods represent coding '0';

the high level of n cycles and the low level of 2n cycles represent the code '1';

the high level of n cycles and the low level of greater than or equal to 3n cycles represents the start of a new byte, where n is a positive integer.

3. An ultrasonic communication method according to claim 2, characterized in that: n > is 3.

4. The ultrasonic communication method according to claim 1, characterized in that: the coded signal is played by calling a sound card to drive, and modulated ultrasonic waves are generated.

5. The ultrasonic communication method according to claim 4, characterized in that: the coded signal is a char type array.

6. The ultrasonic communication method according to claim 1, characterized in that: after receiving the ultrasonic wave, the receiving end obtains a coding signal through processing, outputs the coding signal to an IO port of the processor, and resets the timer after the processor stores the value of the timer at the moment on the rising edge of the IO port and times again;

and the receiving end decodes the received coded signal according to the value of the timer.

7. The ultrasonic communication method according to claim 6, characterized in that: the rules for decoding at the receiving end are:

the code value is 0 when the value of the timer <2.5nT, 1 when the value of the timer <3.5nT, and the start of a new byte when the value of the timer >3.5nT, where T is the period of the sound wave.

8. The ultrasonic communication method according to any one of claims 1 to 7, characterized in that: the transmitting terminal is an audio power amplifier module of a mobile phone or a flat plate.

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