TWM542893U - Audio RFID tag device - Google Patents

Description

Radio frequency identification sound transmission tag device

The present invention relates to a radio frequency application technology, and more particularly, to a radio frequency identification sound transmission tag device.

Figure 1 is a circuit diagram of a prior art RFID tag circuit. Referring to FIG. 1, the coil 101 senses an external magnetic field, generates oscillation, and provides power to the microprocessor 102 via bridge rectification. The microprocessor 102 loads the signal to the coil Lr through the output 埠Dout, and transmits the data to the read through mutual inductance. Device.

As cost decreases, more and more Radio Frequency Identification (RFID) technologies are used in the consumer and toy industries. In the reader (Reader) cost and mass production considerations, 125KHz RF identification technology is more common in the toy field. From the point of view of digital wireless transmission, to transmit voice data, and to have multi-tag operation, basically the data rate is fast, in order to deal with transmission errors, data loss, communication collision and other issues.

In terms of EM4100/4200 compatible specifications, The data rate is about 125KHz/16=7.8125Kbps. Because the carrier frequency is low, the data rate is not easy to increase. Using this speed to transmit audio data (Audio Data) is slightly inadequate. At the same time, when there are multiple radio frequency identification tags (Tag), the communication collision (Collision) problem is dealt with, thus further reducing the effective data rate.

It is an object of the present invention to provide a radio frequency identification sound transmission tag device whereby the purpose of sound transmission can be accomplished at a lower carrier frequency.

In view of this, the present invention provides a radio frequency identification sound transmission tag device including an LC resonance circuit, a rectifier circuit, and a microprocessor. The LC resonant circuit includes a first end and a second end. The rectifier circuit includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal, wherein the first input end of the rectifier circuit is coupled to the first end of the LC resonant circuit, the rectification A second input of the circuit is coupled to the second end of the LC resonant circuit. The microprocessor includes a first power terminal, a second power terminal, a first input/output port, and a second input/output port, wherein the first power terminal of the microprocessor is coupled to the first output of the rectifier circuit The second power terminal of the microprocessor is coupled to the second output end of the rectifier circuit, and the first input/output port of the microprocessor is coupled to the first end of the LC resonant circuit, and the second end of the microprocessor The input and output ports are coupled to the second end of the LC resonant circuit. The LC is when the RFID sound transmission tag device is in proximity to a radio frequency identification reading device The resonant circuit receives a wireless energy and activates the microprocessor through the rectifier circuit, and then the microprocessor inputs the first input and output of the microprocessor and the microprocessor according to the stored sound data. The two input and output ports respectively output a sound packet and a reverse sound packet.

The present invention provides a radio frequency identification sound transmission tag device including an LC resonance circuit and a microprocessor. The LC resonant circuit includes a first end and a second end. The microprocessor includes a first power terminal, a second power terminal, a first input/output port, and a second input/output port, wherein the first power terminal of the microprocessor is coupled to the first of the LC resonant circuit The second power terminal of the microprocessor is coupled to the second end of the LC resonant circuit, the first input/output port of the microprocessor is coupled to the first end of the LC resonant circuit, and the second end of the microprocessor The input and output ports are coupled to the second end of the LC resonant circuit. When the RFID sound transmission tag device approaches a radio frequency identification reading device, the LC resonance circuit receives a wireless energy, and the microprocessor rectifies the wireless energy through the first power terminal and the second power terminal. Starting the microprocessor, after which the microprocessor outputs a sound packet and a counter in the first input and output port of the microprocessor and the second input and output port of the microprocessor according to the stored sound data. Packet to the sound.

According to a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention, the LC resonance circuit further includes an inductor and a capacitor. The inductor includes a first end and a second end, wherein the first end of the inductor is coupled to the first end of the LC resonant circuit, and the second end of the inductor is coupled to the LC The second end of the resonant circuit. The capacitor includes a first end and a second end, wherein the first end of the capacitor is coupled to the first end of the LC resonant circuit, and the second end of the capacitor is coupled to the second end of the LC resonant circuit.

The radio frequency identification sound transmission label device according to the preferred embodiment of the present invention, the microprocessor includes a rectifier circuit including a first input end and a second input end, wherein the first input end of the rectifying circuit is coupled The first power terminal of the microprocessor is coupled to the second power terminal of the microprocessor for rectifying the wireless energy.

The spirit of the novel is to transmit a wireless audio signal to the reading device through the same coil and the same mechanism on the radio frequency identification sound transmission label device, thereby enabling the transmission device to be used even under a carrier having insufficient bandwidth. Deliver high quality sound without collision problems.

The above and other objects, features and advantages of the present invention will become more apparent and understood.

Lr‧‧‧ coil

102‧‧‧Microprocessor

Dout‧‧‧ Output of microprocessor 102埠

201‧‧‧LC resonant circuit

202‧‧‧Rectifier circuit

203‧‧‧Microprocessor

VDD‧‧‧ power terminal of microprocessor 203

VSS‧‧‧ Ground terminal of microprocessor 203

Two analog outputs of AUDP, AUDN‧‧‧Microprocessor 203埠

Lr‧‧‧Inductance

Cr‧‧‧ capacitor

501‧‧‧Microprocessor

502‧‧‧ Built-in rectifier circuit

LPF‧‧‧ low pass filter

Figure 1 is a circuit diagram of a prior art RFID tag circuit.

FIG. 2 is a circuit diagram of a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention.

Figure 3 is a diagram showing a radio frequency of a new preferred embodiment. A waveform diagram outputted by the LC resonance circuit 201 of the sound transmission label device is identified.

FIG. 4 is a schematic diagram showing the waveform diagram outputted by the LC resonance circuit 201 of the radio frequency identification sound transmission label device of the new preferred embodiment.

FIG. 5 is a circuit diagram of a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention.

FIG. 6 is a circuit diagram of a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention.

FIG. 2 is a circuit diagram of a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention. Referring to FIG. 2, the circuit includes an LC resonant circuit 201, a rectifying circuit 202, and a microprocessor 203. The two ends of the LC resonant circuit 201 are respectively coupled to the two input ends of the rectifier circuit 202. The LC resonant circuit 201 is composed of an inductor Lr and a capacitor Cr. The two output ends of the rectifier circuit 202 are coupled to the power terminal VDD of the microprocessor 203 and the ground terminal VSS. In addition, the microprocessor 203 also includes two analog outputs 埠AUDP and AUDN. Here, the inductance Lr of the LC resonance circuit 201 when the RFID sound transmission tag device approaches the RFID reader.

When the RFID sound transmission tag device approaches a radio frequency identification reading device, the inductance Lr of the LC resonance circuit 201 receives the wireless energy output by the RFID device and passes through the rectifier circuit 202. Row rectification. The microprocessor 203 receives the rectified voltage and is thus activated. Thereafter, the microprocessor 203 outputs a sound packet and a reverse sound packet respectively at the analog outputs 埠AUDP and AUDN of the microprocessor 203 based on the stored sound data. Since the LC resonance circuit 201 receives the sound packet and the reverse sound packet, the waveform output by the LC resonance circuit 201 is as shown in FIG. FIG. 3 is a waveform diagram of the output of the LC resonance circuit 201 of the radio frequency identification sound transmission label device of the new preferred embodiment.

4 is a circuit diagram of a radio frequency identification sound transmission label reading device according to a preferred embodiment of the present invention. Referring to FIG. 4, the reading device includes an inductor 300, a packet detecting device 301, a filtering device 302, and a sound output device 303. By deciphering the packet transmitted by the radio frequency identification sound transmission device and removing the DC component, the sound is restored, thereby demodulating and generating the sound. As shown in FIG. 4, FIG. 4 is a schematic diagram showing the waveform diagram outputted by the LC resonance circuit 201 of the radio frequency identification sound transmission label device of the new preferred embodiment.

Similarly, when there are a plurality of radio frequency identification sound transmission label devices, the packet demodulated by the coil of the radio frequency identification sound transmission label reading device is the sum of the sounds of all the radio frequency identification sound transmission label devices, so the sound taken out is The result of multiple sound mixers. Therefore, there is no problem of communication collision. Since the data transmission uses the same RF signal, no carrier recovery is required. Therefore, the radio frequency identification sound transmission tag reading device circuit is relatively simple.

FIG. 5 is a circuit diagram of a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention. Referring to FIG. 5, the difference between this circuit and FIG. 2 is that the microprocessor 501 has a built-in rectifier circuit 502. Therefore, no external extra rectifier circuit is required. FIG. 6 is a circuit diagram of a radio frequency identification sound transmission label device according to a preferred embodiment of the present invention. Please refer to FIG. 6. The difference between the circuit of FIG. 6 and FIG. 5 is that the analog output 埠AUDP and AUDN are respectively coupled with a low-pass filter LPF for filtering noise.

In summary, the spirit of the present invention lies in the use of an analog packet structure on the RFID sound transmission tag device, through the same coil, the same mechanism, transmitting wireless audio signals to the reading device, thereby, even in the case of insufficient bandwidth Under the carrier, high-quality sound can also be transmitted without collision problems.

The specific embodiments set forth in the detailed description of the preferred embodiments are merely used to facilitate the description of the technical scope of the present invention, and are not intended to limit the present invention narrowly to the above embodiments, without departing from the spirit of the present invention and the following claims. The scope of the scope and the implementation of various changes are within the scope of this new model. Therefore, the scope of protection of this new type is subject to the definition of the scope of the patent application.

201‧‧‧LC resonant circuit

202‧‧‧Rectifier circuit

203‧‧‧Microprocessor

VDD‧‧‧ power terminal of microprocessor 203

VSS‧‧‧ Ground terminal of microprocessor 203

Two analog outputs of AUDP, AUDN‧‧‧Microprocessor 203埠

Claims (5)

A radio frequency identification sound transmission label device includes: an LC resonant circuit including a first end and a second end; a rectifying circuit comprising a first input end, a second input end, a first output end, and a a second output end, wherein the first input end of the rectifier circuit is coupled to the first end of the LC resonant circuit, the second input end of the rectifier circuit is coupled to the second end of the LC resonant circuit; a first power supply terminal, a second power supply terminal, a first input/output port, and a second input/output port, wherein the first power terminal of the microprocessor is coupled to the first output end of the rectifier circuit, The second power terminal of the microprocessor is coupled to the second output end of the rectifier circuit, the first input and output port of the microprocessor is coupled to the first end of the LC resonant circuit, and the second input and output of the microprocessor Coupling the second end of the LC resonant circuit, wherein when the RFID sound transmitting tag device approaches a radio frequency identification reading device, the LC resonant circuit receives a wireless energy and transmits the microprocessor through the rectifier circuit ,after that The microprocessor in response to the sound data stored in the second input-output port of the first input-output port of the microprocessor, and the microprocessor outputs an audio packet and a voice packet counter. The radio frequency identification sound transmission label device of claim 1, wherein the LC resonance circuit comprises: an inductor comprising a first end and a second end, wherein the first end of the inductor is coupled to the a first end of the LC resonant circuit, the second end of the inductor The second end of the LC resonant circuit is coupled to the first end and the second end, wherein the first end of the capacitor is coupled to the first end of the LC resonant circuit, and the second end of the capacitor The end is coupled to the second end of the LC resonant circuit. A radio frequency identification sound transmission label device includes: an LC resonant circuit including a first end and a second end; a microprocessor including a first power end, a second power end, and a first input/output port And a second input/output port, wherein the first power terminal of the microprocessor is coupled to the first end of the LC resonant circuit, and the second power terminal of the microprocessor is coupled to the second end of the LC resonant circuit. a first input/output port of the microprocessor is coupled to the first end of the LC resonant circuit, and a second input/output port of the microprocessor is coupled to the second end of the LC resonant circuit, wherein when the radio frequency identification sound is transmitted When the tag device approaches a radio frequency identification reading device, the LC resonant circuit receives a wireless energy, and the microprocessor rectifies the wireless energy through the first power terminal and the second power terminal, and then starts the microprocessor. Then, the microprocessor outputs a sound packet and a reverse sound packet respectively at the first input/output port of the microprocessor and the second input/output port of the microprocessor according to the stored sound data. The radio frequency identification sound transmission label device of claim 3, wherein the LC resonance circuit includes an inductor including a first end and a second end, wherein the inductance The first end is coupled to the first end of the LC resonant circuit, the second end of the inductor is coupled to the second end of the LC resonant circuit, and a capacitor includes a first end and a second end, wherein the The first end of the capacitor is coupled to the first end of the LC resonant circuit, and the second end of the capacitor is coupled to the second end of the LC resonant circuit. The radio frequency identification sound transmission label device of claim 1, wherein the microprocessor comprises: a rectifying circuit comprising a first input end and a second input end, wherein the rectifying circuit is first The input end is coupled to the first power end of the microprocessor, and the second input end of the rectifier circuit is coupled to the second power end of the microprocessor for rectifying the wireless energy.