CN202773066U

CN202773066U - Low-cost radio frequency identification device based on audio interface

Info

Publication number: CN202773066U
Application number: CN 201220388093
Authority: CN
Inventors: 王忠南; 钟志明; 李金华
Original assignee: XIAMEN INNOV ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: XIAMEN INNOV ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2012-08-07
Filing date: 2012-08-07
Publication date: 2013-03-06
Anticipated expiration: 2022-08-07

Abstract

The utility model provides a low-cost radio frequency identification device based on audio interfaces, which is adapted to electronic equipment with audio interfaces. The device mainly comprises a radio frequency chip module, an MCU and a signal conversion circuit. The signal conversion circuit is electrically connected with the audio interface of electronic equipment. An audio analog signal sent by the electronic equipment is output from the left or right earphone channel of the audio interface to the signal conversion circuit and then is converted into a square signal and sent to the MCU by the signal conversion circuit. After that, through the modulation-demodulation operation of the MCU, the square signal is converted into an audio carrier signal. The radio frequency chip module acquires a radio frequency signal and then transmits the radio frequency signal to the MCU. Then the radio frequency signal is modulated with the audio carrier signal by the MCU and is transmitted from the MCU to the signal conversion circuit in the form of a square signal. The square signal received by the signal conversion circuit is converted into an audio analog signal and is transmitted from the MIC channel of the audio interface of the electronic equipment to the terminal of the electronic equipment. According to the technical scheme of the utility model, no extra audio module is adopted, so that the cost is greatly saved. The power consumption is low.

Description

A kind of low cost radio frequency recognition device based on audio interface

Technical field

The utility model relates to a kind of low cost radio frequency recognition device based on audio interface.

Background technology

Present data transmission device based on audio interface, the conversion that need to additionally provide the audio-frequency module that comprises audio coder and audio decoder to realize data, cost and application power consumption are higher.For example, notification number is that the Chinese patent case of CN102394979A " uses the traffic headset interface to carry out the method for high speed data transfer ", and wherein the peripheral hardware to the mobile phone the transmission of data needs built-in audio coder and audio decoder.

The utility model content

The purpose of this utility model is to provide a kind of low cost radio frequency recognition device based on audio interface, does not wherein need additionally to arrange audio-frequency module, has significantly saved cost and low in energy consumption.

A kind of low cost radio frequency recognition device based on audio interface adapts to the electronic equipment with audio interface, mainly comprises radio frequency chip module, MCU and signaling conversion circuit, and this signaling conversion circuit is electrically connected to the audio interface of electronic equipment end;

The audio analog signals that the electronic equipment end sends exports signaling conversion circuit to from a left side or the right earphone passage of audio interface, after the process signaling conversion circuit converts square-wave signal to, I/O data-interface by MCU is sent to MCU, and then MCU becomes audio carrier signal according to this square wave modulating and demodulating signal; This radio frequency chip module is transferred to MCU with the radiofrequency signal of obtaining by signal bus, this radiofrequency signal is compiled resolving Algorithm through the audio frequency among the MCU and is modulated on the above-mentioned audio carrier signal, export signaling conversion circuit with the square-wave signal form to from the 2nd I/O data-interface of MCU, convert audio analog signals to by signaling conversion circuit and send to the electronic equipment end from the MIC passage of the audio interface of electronic equipment end.

Described signaling conversion circuit comprises pull down resistor R1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, pull down resistor R6, capacitor C 1 and capacitor C 2, wherein the I/O data-interface of MCU and connecting resistance R2, resistance R 3, resistance R 4 and the capacitor C 1 of connecting are electrically connected a left side or the right earphone passage of electronic equipment end audio interface, this resistance R 2 meets bias voltage Vcc, this resistance R 3, resistance R 4 ground connection, and drop-down resistance R 1 one end ground connection, the other end is electrically connected a left side or the right earphone passage of electronic equipment end audio interface; The 2nd I/O data-interface series resistance R5 of MCU and capacitor C 2 are electrically connected the MIC passage of electronic equipment end audio interface, and drop-down resistance R 6 one end ground connection, and an end is electrically connected the MIC passage of electronic equipment end audio interface.

After having adopted technique scheme, owing to only needing a small amount of resistance capacitance just can consist of the conversion that signaling conversion circuit is realized data, greatly reduce cost, and this signaling conversion circuit power consumption being very low, therefore, based on being applied in of this technical scheme very large saving is arranged also on the power consumption.

Description of drawings

Fig. 1 is operation principle schematic diagram of the present utility model;

Fig. 2 is signaling conversion circuit schematic diagram in the utility model.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Embodiment

Such as Fig. 1, shown in 2, a kind of low cost radio frequency recognition device based on audio interface of the utility model, adapt to the electronic equipment with audio interface, it mainly comprises radio frequency chip module 1, MCU2 and signaling conversion circuit 3, this signaling conversion circuit 3 is electrically connected to the audio interface 4 of electronic equipment end, the audio analog signals that the electronic equipment end sends exports signaling conversion circuit 3 to from a left side or the right earphone passage (LEFT or RIGHT passage) of audio interface 4, after process signaling conversion circuit 3 converts square-wave signal to, I/O data-interface 21 by MCU2 is sent to MCU2, and then MCU2 becomes audio carrier signal according to this square wave modulating and demodulating signal; This radio frequency chip module 1 is transferred to MCU2 with the radiofrequency signal of obtaining by signal bus, this radiofrequency signal is compiled resolving Algorithm through the audio frequency among the MCU2 and is modulated on the above-mentioned audio carrier signal, export signaling conversion circuit 3 with the square-wave signal form to from the 2nd I/O data-interface 22 of MCU2, convert audio analog signals to by signaling conversion circuit 3 and send to the electronic equipment end from the MIC passage (microphone channel) of the audio interface 4 of electronic equipment end.

As shown in Figure 2, described signaling conversion circuit 3 comprises pull down resistor R1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, pull down resistor R6, capacitor C 1 and capacitor C 2, wherein the I/O data-interface 21 of MCU2 and connecting resistance R2, resistance R 3, resistance R 4 and the capacitor C 1 of connecting are electrically connected a left side or the right earphone passage of electronic equipment end audio interface 4, this resistance R 2 meets bias voltage Vcc, this resistance R 3, resistance R 4 ground connection, and drop-down resistance R 1 one end ground connection, the other end are electrically connected a left side or the right earphone passage of electronic equipment end audio interface 4; The 2nd I/O data-interface 22 series resistance R5 of MCU2 and capacitor C 2 are electrically connected the MIC passage of electronic equipment end audio interface 4, and drop-down resistance R 6 one end ground connection, and an end is electrically connected the MIC passage of electronic equipment end audio interface 4.

The audio analog signals that the electronic equipment end sends exports signaling conversion circuit 3 to from a left side or the right earphone passage of audio interface 4, pull down resistor R1 by 3 kinds of signaling conversion circuits reduces to 0 level with DC level wherein, behind capacitor C 1 elimination direct current signal, to be exported to 1/2 of bias voltage Vcc that the level adjustment of the I/O data-interface 21 of MCU2 connects to resistance R 2 by resistance R 2, resistance R 3 and resistance R 4, convert the I/O data-interface 21 that square-wave signal is input to MCU2 to by capacitor C 1 at last; Square-wave signal from the 2nd I/O data-interface 22 output of MCU2, filter out AC signal by resistance R 5, after process capacitor C 2 converts sine wave signal to, reduced the amplitude of sine wave signal by pull down resistor R6, convert the discernible audio analog signals of electronic equipment end to and send to the electronic equipment end from the MIC passage of audio interface 4.

Described electronic equipment includes but not limited to mobile phone, panel computer, on-vehicle navigation apparatus or notebook computer with audio interface etc.

The above, it only is the utility model preferred embodiment, be not that technical scope of the present utility model is imposed any restrictions, therefore every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any trickle modification, equivalent variations and modification that above embodiment does.

Claims

1. low cost radio frequency recognition device based on audio interface, adapt to the electronic equipment with audio interface, it is characterized in that: mainly comprise radio frequency chip module, MCU and signaling conversion circuit, this signaling conversion circuit is electrically connected to the audio interface of electronic equipment end;

2. a kind of low cost radio frequency recognition device based on audio interface according to claim 1, it is characterized in that: described signaling conversion circuit comprises pull down resistor R1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, pull down resistor R6, capacitor C 1 and capacitor C 2, wherein an I/O data-interface and the connecting resistance R2 of MCU, resistance R 3, resistance R 4 and the capacitor C 1 of connecting are electrically connected a left side or the right earphone passage of electronic equipment end audio interface, this resistance R 2 meets bias voltage Vcc, this resistance R 3, resistance R 4 ground connection, and drop-down resistance R 1 one end ground connection, the other end is electrically connected a left side or the right earphone passage of electronic equipment end audio interface; The 2nd I/O data-interface series resistance R5 of MCU and capacitor C 2 are electrically connected the MIC passage of electronic equipment end audio interface, and drop-down resistance R 6 one end ground connection, and an end is electrically connected the MIC passage of electronic equipment end audio interface.