CN102832968A - Method for performing communication between mobile phone and equipment by using audio interface - Google Patents

Abstract

The invention relates to a method for communicating between a mobile phone and a device by using an audio interface. Including mobile phone, two-way audio cable, conversion module and equipment. Inside the mobile phone, the encrypted digital signal is first packaged, and the header is added, and then the packaged digital signal is converted into a digital audio signal after encoding, and finally the digital audio signal is converted into an analog audio signal by DA conversion; the outgoing analog The audio signal is transmitted to the device conversion module through the connection line, and the module is connected to the device; the conversion module also contains an audio interface. After receiving the audio signal, the module processes the received signal through the control function in the module, and converts the obtained The analog audio signal is converted into a digital audio signal through AD conversion, and then decoded into a digital signal, and the obtained digital signal is unpacked and provided to the device. The invention does not affect the traditional audio function, has low cost, is easy to carry, and is convenient to use.

Description

A method for communicating between a mobile phone and a device using an audio interface

technical field

The invention relates to a method for communicating between a mobile phone and a device, in particular to a method for using an audio interface to communicate between the mobile phone and the device.

Background technique

With the rapid development of communication technology and Internet technology, mobile phones have gradually become instant, interactive and popular from a single mobile communication terminal. As a new medium, the mobile phone is changing the traditional way of information dissemination with its unique media characteristics, and it is becoming more and more popular among the people. The configuration and appearance of mobile phones are also gradually refined and refined. The general mobile phone has only one USB interface at most, or even no USB interface or no data cable. When there is no USB interface or the USB interface is occupied or there is no data cable at this time, it is inconvenient to realize the transmission of files, so a method for replacing the USB interface is needed to realize the communication between the mobile phone and other devices. Of course, this communication method can also be realized through the USB interface. Mobile phones generally contain an audio interface, which acts as a bridge between analog and digital signals, and can transmit analog signals in both directions.

The existing bluetooth function can realize the information interaction between mobile phone and specific equipment (mobile phone, computer) at present, but also has its limitation. When transferring files via Bluetooth, the object is the mobile phone or computer that is specifically paired with the mobile phone, and the distance between them is within ten meters and it is guaranteed not to be interfered by other signals. It will cause inconvenience in use, and data in certain formats cannot be viewed in time.

Contents of the invention

The present invention mainly solves the technical problems existing in the prior art; it provides a mobile phone and a device that does not need a built-in conversion chip in the mobile phone or equipment, and reduces production and use costs. method.

Another purpose of the present invention is to solve the technical problems existing in the prior art; to provide a mobile phone as a communication tool, which is easy to carry, does not cause a burden on the cost, and is convenient to use, without the need to search for a specific object and carry out Decryption pairing, a practical way to use the audio interface to communicate between the mobile phone and the device.

Above-mentioned technical problem of the present invention is mainly solved by following technical scheme:

A method for communicating between a mobile phone and a device using an audio interface, comprising the following selection steps:

Select step 1, the communication steps for the user to transfer the mobile phone information to the device, including:

Step 1.1, use a two-way audio cable to connect the audio interface of the mobile phone to the audio interface of the conversion module

Connect, select the information to be transmitted in the mobile phone, encode the digital signal encrypted and packaged and add the header into the digital audio signal inside the mobile phone, and then convert it into corresponding analog audio data through DA and send it to the conversion module through the connecting line;

Step 1.2, connect the conversion module to the device, identify it by the control function inside the conversion module

The packet header information of the signal is used to determine whether to further convert the received analog audio signal. If not, go to step 1.4;

Step 1.3, the conversion module converts the obtained analog audio signal into a digital audio signal through AD, and then converts it into a digital signal through decoding;

Step 1.4, the conversion module transmits the final signal to the device connected to it;

Select step 2, the communication steps where the user transmits the information of the device to the mobile phone, including:

Step 2.1, use a two-way audio cable to connect the audio interface of the mobile phone to the audio interface of the conversion module, select the information to be transmitted in the device, and encode the encrypted, packaged and header-added digital signal into a digital audio signal inside the device Then it is converted into corresponding analog audio data through DA and sent to the conversion module through the connection line;

Step 2.2, connect the conversion module to the mobile phone, and judge whether to further convert the received analog audio signal through the header information of the control function identification signal in the conversion module. If not, go to step 2.4;

Step 2.3, the conversion module converts the obtained analog audio signal into a digital audio signal through AD, and then converts it into a digital signal through decoding;

In step 2.4, the conversion module transmits the final signal to the connected mobile phone.

In the above-mentioned method for communicating between a mobile phone and a device using an audio interface, the conversion module in the selection step 1 or selection step 2 is an A/D conversion module

In the above-mentioned method for communicating between a mobile phone and a device using an audio interface, in the step 1.2 or step 2.2, the conversion module conversion module includes an encoding/decoding conversion module and a device connected to the encoding/decoding conversion module Control module, the concrete method that described control module is used for identifying the Baotou information of signal is as follows: define the algorithm of the character string that does not appear in the audio signal as Baotou, control module is identified by detecting whether the outgoing signal has this specific Baotou This signal, the traditional audio signal has no packet header; when the packet header signal detected by the control module conforms to the non-traditional audio signal, it needs to be coded/decoded and A/D converted, otherwise, the control module directly transmits it to the device or For mobile phones, no conversion processing is performed.

In the above-mentioned method for communicating between a mobile phone and a device using an audio interface, it is characterized in that: the header information includes two types, and its function is to find the starting point for digital signal transmission more quickly. If there is no such One kind of packet header information is regarded as a traditional audio signal; the other is similar to the traditional packet header, including ID, control information (such as the size of each audio segment, parity check, whether to retransmit, whether to terminate transmission, etc.), its role is to ensure digital The reliability of signal transmission, such as the length of the signal between the headers is certain, if it is less than this length, it is not a correct signal. These two types are the start signal header and the intermediate content header, defined as follows:

Start signal header: The control module detects the starting point of digital signal transmission through the start signal header, and the middle content header: contains ID, control information, and control information includes the size, odd

Even parity, whether to retransmit, whether to terminate the transmission, etc.

It is worth noting that in the step 1.1 or step 2.1, the codec conversion between the digital signal and the digital audio signal is realized by an appropriate algorithm, so that the attenuation of the converted audio signal during transmission It will not cause loss of previous digital signals. When we want to convert a general digital file F into a digital audio signal W for transmission, four requirements must be met: 1. F can be completely recovered from W; 2. The frequency range of W should be in an area that is not easily disturbed by the environment ; 3. W is not easily disturbed by noise, thereby reducing the probability of retransmission; 4. The code size of W is statistically as small as possible for fast transmission. The encoding process is as follows: 1. Transform F (it can be a common signal transformation such as FFT, wavelet, etc.) to transform it into a sequence Ti; 2. Perform FM transformation on Ti to make it Wi, and the final W is these Wi Sum. The decoding process is the inverse process of the above process, and the transformation uses the corresponding inverse transformation.

In the above-mentioned method for communicating between a mobile phone and a device using an audio interface, the two-way audio connection line includes a data line capable of connecting the audio interface of the mobile phone or the USB interface and the device interface, and the connection line transmits analog signal. When there are other ways of transmitting signals between the transmitting party and the receiving party (such as a microphone and a speaker), this connection line can be saved, that is, the audio signal is transmitted through the air, the speaker on the mobile phone sends the audio signal, and the microphone end of the device receives the audio signal .

In the above-mentioned method for communicating between a mobile phone and a device by using an audio interface, the device includes one of a smart phone, a computer, a printer, a projector or any combination thereof.

Therefore, the present invention has the following advantages: 1. There is no need for a built-in conversion chip in the mobile phone or equipment, which reduces production and use costs; 2. The communication tool mobile phone adopted is easy to carry and does not cause a burden on the cost. Convenient, no need to find specific objects and perform decryption pairing, strong practicability.

Description of drawings

Fig. 1 is a schematic diagram of system structure connection of the present invention.

Fig. 2 is a flow chart of the method of the present invention.

FIG. 3 is a flow chart of the information flow conversion process of the present invention.

Detailed ways

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Example:

As shown in the drawings, the invention includes a mobile phone, a two-way audio connection line, a conversion module and equipment. The mobile phone contains an audio interface (microphone and earphone), which is connected to the conversion module of the device through a cable for signal interaction; inside the mobile phone, the encrypted digital signal is first packaged, plus a header, and then the packaged digital signal is encoded Converted into a digital audio signal, and finally converted by DA to convert the digital audio signal into an analog audio signal, the encoding process from the digital signal to the digital audio signal is realized by an appropriate algorithm, so that the attenuation of the converted audio signal during transmission The previous digital signal will not be lost (for example, redundant coding is used, and more redundancy is used for the high-frequency and low-frequency target codes); the outgoing analog audio signal is transmitted to the equipment conversion module through the connecting line, and the module is connected to the to the device; the conversion module also contains an audio interface. After receiving the audio signal, the module processes the received signal through the control function in the module, and judges the type of the signal according to the packet header information of the signal (it is other The signal is still a traditional audio signal); when conversion is required, the conversion module converts the obtained analog audio signal into a digital audio signal through AD conversion, and then decodes it into a digital signal, and provides the obtained digital signal to the device after unpacking. Conversely, using the above processing process, it is also possible to transmit data from the device to the mobile phone. In this embodiment, the equipment is a projector, and the audio interface of the mobile phone is connected to the audio interface of the conversion module through a connecting line, and the conversion module is connected to the projector; The data is recorded, so the received information needs to be converted and processed by the conversion module, and the corresponding data can be displayed on the projector.

The following takes the transfer of image files between the mobile phone and the projector to the projector as an example, and introduces how to use the audio interface to realize the information interaction between the mobile phone and the projector.

Specifically include the following steps:

Step (1). Connect the mobile phone from the audio interface to the conversion module through the two-way audio cable

Audio interface, select the image file to be transmitted to the projector, the file is encrypted and stored in the mobile phone memory in the form of a packaged digital signal, encoded into a digital audio signal by the software inside the mobile phone, and then converted into a digital audio signal by digital DA The analog audio signal is sent to the conversion module through the audio interface. Step (2). Connect the conversion module to the projector. The conversion module receives the incoming analog audio signal, and judges whether it needs to be converted by identifying the packet header information of the signal through the control function. Since the specific device is a projector, the device does not use the traditional recording function, and the obtained signal needs to be converted. Step (3). The conversion module converts the obtained analog audio signal into a digital audio signal through AD conversion, and then converts it into a digital signal through decoding, and provides it to the projector for subsequent analysis (such as watching pictures or analyzing medical images).

A specific implementation of encoding and decoding in step (1) is as follows (more complex methods can be analogized):

1) For F simple window transformation (rectangular window, length 2), if E is used to represent the end bit, we have

There are 7 types of digital fragments Ti - 00, 01, 10, 11, 0E, 1E and E;

2) Modulate Ti into Wi with three frequencies, the frequencies used are 200Hz, 300Hz and 500Hz, with

Volume modulation method is as follows: 200Hz means 00, 300Hz means 01, 500Hz means E, 200Hz+300Hz means 10, 200Hz+500Hz means 0E, 300Hz+500Hz means 1E, 200Hz+300Hz+500Hz means 11.

The audio signal frequency range of the above encoding result is 200Hz to 3000Hz, which is very suitable for audio transmission. If combined with the definition of the packet header, the end bit E of the above encoding can be saved, making the encoding efficiency higher. The decoding process is a simple inverse of the above process.

It should be emphasized that this encoding method is only one of many encoding methods that can be adopted by those skilled in the art, and it does not rule out that other encoding methods can be used to encode information.

In the step (2), an implementation scheme of adding the header signal and detecting the header signal is as follows: it is divided into two types: 1. For the definition of the header of the non-traditional audio signal, it is to add 2K mute signals before the digital signal packet 0, each signal is 2K 0 signal values plus eigenvalues. When the control module starts to detect the signal, the first one encounters a non-zero signal, indicating that it is a traditional audio, which is sent directly to the device without conversion; if the first one encounters a 0 signal, it may be that we are transmitting in a non-traditional way The starting point of the signal, continue to detect K or more than K signals, if they are all 0, then the signal is the non-traditional audio signal we want to transmit; 2. For the header of the signal that is already in the non-traditional transmission mode, We define it similar to the traditional header, including ID, control information (such as the size of each segment of audio, parity bit, whether to retransmit, whether to terminate the transmission, etc.), according to the header information, we know that each segment of the signal in transmission size, form an interruption, continue to detect the packet header, and stop the transmission when the control information of the packet header contains termination transmission information (such as a long segment of silence). This method does not need to detect all signals, but skip detection, which achieves the goal of rapid detection.

The above steps are the information transmission process from the mobile phone to the device introduced, and the present invention can also realize the information transmission process from the device to the mobile phone, that is, the reverse process of the above steps, the steps are the same, and will not be repeated here.

After adopting this method, 1. there is no need to build a conversion chip in the mobile phone or equipment, which reduces production and use costs; It is easy to promote this method. 2. The communication tool mobile phone used in this method is easy to carry and does not cause a burden on the cost. At the same time, it is convenient to use. It does not need to find a specific object like Bluetooth and perform decryption and pairing, so that all kinds of people can collect the required data in time. Stored in the mobile phone and then sent to the required device, it is very practical. 3. The equipment conversion module adopted in this method is our innovation. This module is used for converting signals and includes a control module. Through this module, the received signal is identified (whether it needs to be converted or a traditional audio signal), It not only provides a new method of communication between the mobile phone and the device, but also does not affect the traditional data transmission method. 4. This method is especially suitable for users with insufficient mobile phone interfaces. When they need to use multiple interfaces to transfer files to a certain device, the method of using the audio interface to communicate between the mobile phone and the device provides a new communication path. It does not require professional knowledge, making the use of mobile phones more efficient, of higher value, and for a wider audience. the

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (6)

1. a method of utilizing COBBAIF between mobile phone and equipment, to carry out communication is characterized in that, comprises following selection step:

Select step 1, the user is passed to the communication step of equipment with cellphone information, specifically comprises:

Step 1.1 is used the COBBAIF of two way audio connecting line with handset audio interface and modular converter

Link to each other, in the selected mobile phone the information that will transmit, convert corresponding analog audio data to through DA again after the digital signal encoding after will encrypting and pack and add packet header in mobile phone inside becomes digital audio and video signals and send modular converter to through connecting line;

Step 1.2 is connected to equipment with modular converter, discerns through the controlled function in this modular converter

The header packet information of signal judges whether the affected further conversion process of the simulated audio signal that receives, if do not need, changes step 1.4;

Step 1.3, modular converter converts the simulated audio signal that obtains to digital sound through AD

Frequently signal is converted into digital signal through decoding again;

Step 1.4, modular converter sends final signal to coupled equipment;

Select step 2, the user is passed to the communication step of mobile phone with the information of equipment, specifically comprises:

Step 2.1; Use the two way audio connecting line that the handset audio interface is linked to each other with the COBBAIF of modular converter; In the selected equipment the information that will transmit, convert corresponding analog audio data to through DA again after the digital signal encoding after device interior will be encrypted and pack and add packet header becomes digital audio and video signals and send modular converter to through connecting line;

Step 2.2 is connected to mobile phone with modular converter, and the header packet information through the controlled function identification signal in this modular converter judges whether the affected further conversion process of the simulated audio signal that receives, if do not need, changes step 2.4;

Step 2.3, modular converter converts the simulated audio signal that obtains to digital audio and video signals through AD, is converted into digital signal through decoding again;

Step 2.4, modular converter sends final signal to coupled mobile phone.

2. a kind of method of utilizing COBBAIF between mobile phone and equipment, to carry out communication according to claim 1 is characterized in that, the modular converter in described selection step 1 or the selection step 2 is the A/D modular converter.

3. a kind of method of utilizing COBBAIF between mobile phone and equipment, to carry out communication according to claim 1; It is characterized in that; In described step 1.2 or the step 2.2; It is following that said control module is used for the concrete grammar of header packet information of identification signal: definition does not appear at the algorithm of character string of audio signal as packet header, and whether control module has this specific packet header to discern this signal through detecting the signal that is spread out of, and the conventional audio signal does not have packet header; Signal meets non-traditional audio signal when the detected packet header of control module, just need carry out coding/decoding and A/D conversion to it, otherwise control module directly reaches equipment or mobile phone with it, does not do conversion process.

4. a kind of method of utilizing COBBAIF between mobile phone and equipment, to carry out communication according to claim 3, it is characterized in that: described header packet information comprises two kinds of header packet informations, i.e. initial signal packet header and medium content packet header, definition:

Initial signal packet header: control module is through the starting point of initial signal packet header detection digital data transmission, medium content packet header: comprise ID, control information.

5. a kind of method of utilizing COBBAIF between mobile phone and equipment, to carry out communication according to claim 1; It is characterized in that; Described two way audio connecting line comprises a kind of data wire that can connect mobile phone COBBAIF or USB interface and equipment interface, and what this connecting line transmitted is analog signal.

6. a kind of method of utilizing COBBAIF between mobile phone and equipment, to carry out communication according to claim 1 is characterized in that described equipment comprises a kind of or its combination in any in smart mobile phone, computer, printer, the projecting apparatus.

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