CN1684377A - Wireless earphone system - Google Patents

Abstract

A wireless earphone system, comprising a transmitting device and a wireless earphone, wherein the wireless earphone includes a wireless network card conforming to the 802.11/a/b/g standard for receiving data packets and unpacking the data packets; a control processor, It is connected with the 802.11a/b/g wireless network card, and is used to judge whether the data packet is transmitted correctly according to the address field of the data packet, and discard it if it is wrong, and perform sound field mode and surround effect processing on the unpacked digital audio signal; and a digital/analog converter connected to the control processor for converting the processed digital audio signal into an analog audio signal. The principle of the transmitting device matched with the wireless earphone is similar to that of the wireless earphone, and the long-distance transmission of the audio signal is realized through the wireless network card conforming to the 802.11a/b/g standard.

Description

Wireless Headphone System

【Technical field】

The invention relates to a wireless earphone system, in particular to a wireless earphone system which utilizes the IEEE802.11a/b/g standard to realize voice sending and receiving.

【Background technique】

Wireless earphones have come out many years ago, and the wireless transmission methods of signals include high-frequency radio wave wireless transmission methods and infrared wireless transmission methods. High-frequency radio wave wireless transmission methods can usually be divided into analog modulation methods and digital modulation methods.

The use of infrared is often limited by the included angle of transmission. It is necessary to keep the transmitter and receiver in a straight line to have a better reception effect, and it is easy to be affected by objects and block communication. In the analog modulation mode, noise interference is superimposed on the analog signal, and it is difficult for the receiving end to filter out the noise. In the case of severe noise interference, only the power of the transmitting end can be increased to improve the signal-to-noise ratio, thereby improving the receiving quality of the signal. Compared with the analog modulation method, the digital modulation method has stronger anti-interference ability, and the receiving end can easily separate the signal and noise and completely reconstruct the original signal. Therefore, the current wireless earphones mostly adopt the transmission method of digital modulation.

Some of the transmission standards used by existing digital wireless earphones adopt self-defined standards, and some adopt established standards. The Chinese patent application with publication number CN1419365A published on May 21, 2003 provides a wireless headset for teachers and a wireless headset for students in a digital wireless voice teaching system. The wireless headset adopts a self-defined standard, the distance and effect of voice transmission are difficult to guarantee, and the scope of application is narrow, which cannot match the current multimedia equipment. Similarly, U.S. Patent No. 6,021,207 disclosed on February 1, 2000 discloses a wireless earphone capable of communicating with a remote device. The transmitting device realizes the signal transmission between the earphone and the remote device. The wireless earphones of the above-mentioned custom standards all have the problem that the transmission quality is difficult to guarantee, and they cannot be compatible with standard products. Headphones with established standards are easily compatible with many established technologies.

In terms of wireless transmission standards, there are currently Bluetooth, HomeRF, and 802.11 standards. The effective communication range of the Bluetooth standard is about 10 meters, it works in the 2.45GHz frequency band, and the maximum transmission rate is 10Mbps. The HomeRF standard was developed by the HomeRF working group. It works in the same 2.4GHz frequency band as the Bluetooth and 802.11b standards. It has a wider effective communication range than the Bluetooth, but it is only limited to the home range. The above two standards have certain limitations in the range of wireless transmission. In comparison, the 802.11 standard is a wireless transmission standard commonly used in industry at present, and its effective transmission range is the widest. Among the 802.11 standards, 802.11b is the earliest developed Wi-Fi technology. Its transmission range is 100-300 meters, it works in the 2.4GHz frequency band, and its maximum transmission rate is 11Mbps. 802.11g is an extended standard of 802.11b. It uses the same 2.4GHz frequency band as the 802.11b standard, but the transmission range is not as good as 802.11b, and the maximum transmission rate can reach 54Mbps. The transmission range of 802.11a is not as good as 802.11b and 802.11g. It works in the 5.8GHz frequency band, and the same transmission rate as 802.11b can reach 54Mbps. The biggest advantage of 802.11a is that it uses the 5.8GHz frequency band, which can avoid interference with most devices working at 2.4GHz.

According to the above introduction, it can be seen that the use of wireless earphones conforming to 802.11a, 802.11b and 802.11g standards can realize long-distance transmission and reception of wireless audio signals that cannot be realized by bluetooth earphones or infrared earphones. Secondly, due to the large bandwidth of 802.11a/b/g, there is no need to compress and decompress the voice signal, so as to achieve the high quality of original sound reproduction. In addition, the confidentiality of voice signals during long-distance wireless transmission can also be realized by using the existing specifications of the 802.11a/b/g standard.

【Content of invention】

The main purpose of the present invention is to provide a wireless earphone system, which integrates 802.11 standard technology, so that users can listen to audio signals wirelessly within a wider range.

In order to achieve the purpose of the above invention, a wireless earphone system provided by the present invention includes a transmitting device and a wireless earphone. The transmitting device includes: an analog/digital converter for converting the received analog audio signal into a digital audio signal; a control processor connected with the analog/digital converter for performing sound field mode on the digital audio signal and surround effect processing, and provide corresponding destination address information; a 802.11a/b/g standard wireless network card, connected to the control processor, used to package the destination address with the processed digital audio signal, and according to 802.11a/b/g The b/g standard implements data packet encryption and transmission. The principle of the wireless headset is similar to that of the transmitting device, which includes: a wireless network card compatible with 802.11/a/b/g, used to receive data packets at a long distance, and unpack the data packets; a control processor, compatible with 802.11a/b /g wireless network card connection, used to judge whether the data packet is transmitted correctly according to the address information of the data packet, if it is wrong, discard it, and perform sound field mode and surround effect processing on the unpacked digital audio signal; a digital/analog converter , connected with the control processor, used for converting the processed digital audio signal into an analog audio signal for the user to listen to.

By adopting the wireless earphone system of the present invention, the 802.11a/b/g wireless network card can be used to realize long-distance wireless transmission and reception of audio signals, so that the listener is not limited by the geographical range. Moreover, the signal transmission bandwidth is large, and there is no need to compress and decompress the voice signal, so as to achieve the high quality of the original sound reproduction. In addition, the confidentiality of the voice signal during long-distance wireless transmission can also be solved by using the 802.11a/b/g standard There are specification implementations.

【Description of drawings】

FIG. 1 is a structural diagram of a transmitting device of a wireless earphone system according to the present invention.

FIG. 2 is a structural diagram of the wireless earphone of the wireless earphone system of the present invention.

Fig. 3 is one of the basic application diagrams of the wireless earphone system of the present invention.

Fig. 4 is the second schematic diagram of the basic application of the wireless earphone system of the present invention.

【Detailed ways】

The wireless earphone system of the present invention includes a transmitting device 300 and a wireless earphone 100 . FIG. 1 is a structural diagram of a transmitting device 300 for a wireless earphone system according to the present invention. In the embodiment of the present invention, the transmitting device 300 includes the following four parts: an analog-to-digital converter 10, a control processor 20, an 802.11a/b/g wireless device conforming to 802.11a, 802.11b and 802.11g standards The network card 30 and a user interface 40 . The A/D converter 10 further includes a preamplifier 110 and an A/D conversion circuit 112 . In the control processor 20, further include: a micro control unit 210, a FLASH ROM (FlashRead-Only Memory) 212, a SDRAM (Synchronous Dynamic Random Access Memory) 214, a PCI (Peripheral Component Interconnect) interface 216, an I2S ( Inter-IC Sound) interface 218 and a GPIO (General Purpose Input/Output) interface 220.

The preamplifier 110 is connected to the multimedia device 200 and used for receiving and amplifying the analog audio signal output by the multimedia device 200 . The analog/digital conversion circuit 112 is connected to the preamplifier 110 and is used for converting the amplified analog audio signal into a digital audio signal. The analog/digital conversion circuit 112 is connected to the microcontroller unit 210 through an I2S interface 218 . The I2S interface 218 is a bus interface used for audio data transmission between digital audio devices. The converted digital audio signal is processed by the micro control unit 210 in sound field mode and surround effect. SDRAM 214 is connected with MCU 210, and provides software working area for MCU 210. FLASH ROM212 is connected with micro control unit 210 and is used for storing software codes. The micro control unit 210 is connected to the 802.11a/b/g wireless network card 30 through the PCI interface 216 . The micro control unit 210 transmits the processed digital audio signal and its destination address to the 802.11a/b/g wireless network card 30, and the 802.11a/b/g wireless network card 30 completes the data package, based on 802.11a/b/g g standard encryption and launch. In other embodiments, the 802.11a/b/g wireless network card 30 can also communicate with the microcontroller unit through other interfaces, such as PCMCIA (Personal Computer Memory Card International Association) interface, USB (Universal Serial Bus) interface or CF (Compact Flash) interface. 210 for communication. The user interface 40 is connected to the MCU 210 through the GPIO interface 220 . In this embodiment, the user interface 40 is used to adjust the volume of the earphone and switch the signal transmission frequency, etc., because the 802.11a/b/g wireless network card can work in multiple frequency bands such as 2.4GHz or 5.8GHz.

FIG. 2 is a structural diagram of a wireless earphone 100 of the wireless earphone system of the present invention. The wireless earphone 100 includes: a control processor 20', an 802.11a/b/g wireless network card 30' conforming to 802.11a, 802.11b and 802.11g standards, a user interface 40', a digital/analog converter 50 and Headphones 60. The structure of the micro-control unit 20' and the function of the user interface 40' are consistent with the micro-control unit 210 and the user unit 40 of FIG. 1 . The D/A converter 50 includes a D/A conversion circuit 510 and an audio power amplifier 512 , and the audio power amplifier 512 is connected to the D/A conversion circuit 510 . In this embodiment, the 802.11a/b/g wireless network card 30' is connected to the micro control unit 210' through the PCI interface 216', the digital/analog conversion circuit 510 is connected to the micro control unit 210' through the I2S interface 218', and the audio power amplifier 512 Connect with earphone 60.

In the wireless headset 100, the 802.11a/b/g wireless network card 30' is used to receive the data packet sent by the transmitting device 300, and transmit the address field and the digital audio signal after the data packet is unpacked to the micro control unit 210 '. The micro control unit 210' knows whether the data packet is transmitted correctly through the address field of the data packet, and discards the data packet if it is wrong. Then the digital audio signal is processed in sound field mode and surround effect, and the processed digital audio signal is sent to the digital/analog conversion circuit 510 to be converted into an analog audio signal, and the analog audio signal is output to the earphone 60 through the audio power amplifier 512 .

FIG. 3 shows one of the basic application diagrams of the wireless earphone system of the present invention. The wireless transmitting device 300 is connected to the multimedia device 200 to realize long-distance communication with the wireless earphone 100 . Such a multimedia device 200 itself does not have a long-distance wireless transmission function, so a wireless transmission device 300 matching the wireless earphone 100 must be connected. This application is suitable for various VCD, DVD, CD and other media players.

Fig. 4 shows the second basic application diagram of the wireless earphone system of the present invention. The notebook computer 400 and the desktop computer 500 with built-in 802.11 standard wireless network cards can perform long-distance communication with the wireless earphone 100 without the above-mentioned transmitting device 300 . This application is suitable for various personal computers with built-in 802.11 standard transmitting modules, etc.

Claims (17)

1. A wireless earphone system, characterized in that the system includes: A launch device, comprising: An analog-to-digital converter for converting an analog audio signal into a digital audio signal; A first control processor, connected to the analog/digital converter, used to process the digital audio signal in sound field mode and surround effect, and provide corresponding destination address information; A first wireless network card, connected to the first control processor, is used to package the destination address information with the processed digital audio signal, and implement data packet encryption and transmission according to the 802.11a/b/g standard; and A wireless headset, comprising: A second wireless network card, used for receiving data packets from a long distance according to the 802.11a/b/g standard, and unpacking the data packets; A second control processor, connected to the second wireless network card, is used to judge whether the data packet is transmitted correctly according to the address information of the data packet, and discard it if it is wrong, and perform sound field mode and surround effect on the unpacked digital audio signal deal with; A digital-to-analog converter, connected to the second control processor, is used to convert the processed digital audio signal into an analog audio signal. 2. The wireless earphone system as claimed in claim 1, wherein the A/D converter further comprises a preamplifier for amplifying the received analog audio signal. 3. The wireless earphone system as claimed in claim 1, wherein the A/D converter further comprises an A/D conversion circuit for converting the analog audio signal into a digital audio signal. 4. The wireless earphone system as claimed in claim 1, wherein the first control processor further comprises a microcontroller unit for processing digital audio signals. 5. The wireless earphone system as claimed in claim 3, wherein the first control processor further comprises an I2S interface for connecting the A/D conversion circuit and the micro control unit. 6. The wireless earphone system as claimed in claim 1, wherein the first control processor further comprises an interface for connecting the first wireless network card and the micro control unit. 7. The wireless earphone system as claimed in claim 6, wherein the interface is a PCI interface, a PCMCIA interface, a USB interface or a CF interface. 8. The wireless earphone system as claimed in claim 1, wherein the transmitting device further comprises a user interface for adjusting the volume of the earphone and switching the signal transmitting frequency. 9. The wireless earphone system as claimed in claim 8, wherein the first control processor further comprises a GPIO interface for connecting the user interface and the micro control unit. 10. The wireless headphone system as claimed in claim 1, wherein the second control processor further comprises a microcontroller unit for processing digital audio signals. 11. The wireless earphone system as claimed in claim 10, wherein the second control processor further comprises an interface for connecting the second wireless network card and the micro control unit. 12. The wireless earphone system according to claim 11, characterized in that said interface is a PCI interface, PCMCIA interface, USB interface or CF interface. 13. The wireless earphone system as claimed in claim 1, wherein the wireless earphone further comprises a user interface for adjusting the volume of the earphone and switching the signal receiving frequency. 14. The wireless earphone system as claimed in claim 13, wherein the second control processor further comprises a GPIO interface for connecting the user interface and the micro control unit. 15. The wireless headphone system as claimed in claim 1, wherein the D/A converter further comprises a D/A conversion circuit for converting the digital audio signal into an analog audio signal. 16. The wireless earphone system as claimed in claim 15, wherein the second control processor further comprises an I2S interface for connecting the A/D conversion circuit and the micro control unit. 17. The wireless earphone system as claimed in claim 15, wherein the D/A converter further comprises an audio power amplifier for amplifying and outputting the analog audio signal.

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