CN106792309A - General headset - Google Patents

Abstract

The invention relates to a general-purpose earphone, comprising a power interface, a bluetooth communication chip, a button device, an audio output device and a loudspeaker. , the bluetooth communication chip is also used for wireless communication connection with the intelligent terminal, and the audio output device is connected with the speaker. Connect the output voltage of the smart terminal through the power interface to supply power to the Bluetooth communication chip, without installing a battery for power supply, reducing the size of the earphone and reducing the cost of the earphone. Through the wireless communication between the Bluetooth communication chip and the smart terminal, the data transmission realizes the audio playback function, which avoids the audio quality being affected by the quality of the audio interface and the transmission line, and does not need to use a communication chip certified with the relevant smart terminal. The data transmission communication protocol is simple and the development cycle is short. Shorter, further reducing the production cost of headphones.

Description

Universal headset

technical field

The invention relates to earphones, in particular to a general-purpose earphone.

Background technique

Along with the continuous development of social progress and science and technology, people cannot travel without mobile devices such as mobile phones. In work, communication and entertainment, earphones, especially earphones with headset function, are indispensable.

The development trend of mobile devices, especially mobile phones, is getting thinner and thinner. The otg technology based on usb2.0 has been fully popularized. The opening of the lightning interface has made some mobile phones abandon the audio jack and replace it with earphones suitable for the lighting interface and micro interface. The design of this kind of headset requires the use of a communication chip certified by the mobile phone manufacturer. The price is high, the data transmission communication protocol is complicated, the development and debugging time is long, the problem is complicated, and there are few headsets compatible with calls on the market, and the functions are not perfect. Headphones that perform audio transmission through lighting interfaces and micro interfaces have the disadvantage of complex data transmission communication protocols.

Contents of the invention

Based on this, it is necessary to provide a general-purpose earphone with a simple data transmission communication protocol to address the above problems.

A general-purpose earphone, comprising a power interface, a bluetooth communication chip, a button device, an audio output device and a loudspeaker, the power interface is connected to the bluetooth communication chip, and is used to connect to an intelligent terminal, and the bluetooth communication chip is connected to the button device and the audio output device, the Bluetooth communication chip is also used for wireless communication connection with the smart terminal, the audio output device is connected to the speaker,

The power interface is used to access the voltage output by the smart terminal to supply power to the bluetooth communication chip; the bluetooth communication chip is used to receive the control signal sent by the button device, and receive the bluetooth signal sent by the smart terminal; The Bluetooth communication chip performs analog-to-digital conversion on the Bluetooth signal to obtain a digital signal, obtains a corresponding digital signal according to the control signal, performs digital-to-analog conversion to obtain an analog audio signal, and outputs it to the speaker through the audio output device.

The above-mentioned general-purpose headset connects the output voltage of the intelligent terminal through the power interface to supply power to the Bluetooth communication chip, without installing a battery for power supply, which reduces the volume of the headset, reduces the cost of the headset, and improves the working life of the headset. Wireless communication between the Bluetooth communication chip and the smart terminal for data transmission to realize the audio playback function, avoiding the audio quality affected by the quality of the audio interface and transmission line, and because it does not need to communicate with the smart terminal through the data line, no need to use relevant smart terminal authentication The advanced communication chip, the data transmission communication protocol is simple, the development cycle is shorter, and the production cost of the headset is further reduced.

Description of drawings

Fig. 1 is a structural diagram of a universal earphone in an embodiment;

Fig. 2 is the structural diagram of bluetooth communication chip in an embodiment;

Fig. 3 is a structural diagram of a universal earphone in another embodiment;

Fig. 4 is a working flow diagram of the universal earphone in one embodiment.

detailed description

In one embodiment, a general-purpose earphone, as shown in FIG. For connecting with the smart terminal, the Bluetooth communication chip 120 is connected with the button device 130 and the audio output device 140 , the Bluetooth communication chip 120 is also used for wireless communication connection with the smart terminal, and the audio output device 140 is connected with the speaker 150 . The specific types of smart terminals are not unique, and may be terminals such as mobile phones, tablets, and personal computers.

The power interface 110 is used to access the voltage output by the smart terminal to supply power to the Bluetooth communication chip 120 . The power interface 110 is specifically connected and communicated with relevant intelligent terminals through various adaptive interfaces, so that the universal earphone can obtain power as a slave. The specific type of the power interface 110 is not unique. In this embodiment, the power interface 110 includes at least one of a lighting interface, a micro interface and a USB interface connected to the Bluetooth communication chip 120 .

The Bluetooth communication chip 120 is used to receive the control signal sent by the button device 130, and receive the Bluetooth signal sent by the smart terminal; the Bluetooth communication chip 120 performs analog-to-digital conversion on the Bluetooth signal to obtain a digital signal, and obtains the corresponding digital signal according to the control signal to perform digital-to-analog conversion The analog audio signal is obtained and output to the speaker 150 through the audio output device 140 to realize the audio playback function. The specific type of the bluetooth communication chip 120 is not unique. In this embodiment, the bluetooth communication chip 120 is an integrated MCU (Micro Control Unit, micro control unit) chip, which is safe and reliable to use and improves the service life of the general-purpose earphone.

Specifically, the user can send a control signal to the Bluetooth communication chip 120 through the key device 130 to execute the key function. The key device 130 is an AD (Analog Digital, modulus) key circuit collected by a chip through a resistor voltage divider circuit. The key device 130 may include various keys, which respectively send different types of control signals, so that the key device 130 has various key functions. In this embodiment, the button functions of the button device 130 include pause, play, previous song, next song, volume increase and decrease, and power on and off. It can be understood that there is no need for each key to correspond to a function, and it can be flexibly multiplexed, such as the previous song and the volume down function multiplexed, and the Bluetooth communication chip 120 software recognizes short presses and long presses to perform different key functions.

When the user presses the start button in the key device 130, the universal headset enters the bluetooth mode, and the smart terminal is set to connect with the headset. The Bluetooth communication chip 120 performs audio playback control according to the type of the received control instruction, for example, the user can perform audio playback, pause, previous song, next song, or increase or decrease the volume as required. In addition, when the bluetooth communication chip 120 stops audio playback and the earphone is not operated for a preset period of time, the bluetooth communication chip 120 controls the earphone to enter a standby mode to save power. The specific value of the preset duration is not unique. In this embodiment, the preset duration is 10 minutes.

In one embodiment, as shown in Figure 2, the Bluetooth communication chip 120 includes an MCU main core 121, a Bluetooth communication circuit 122, an analog-to-digital conversion circuit 123 and a digital-to-analog conversion circuit 124, and the MCU main core 121 is connected to the power interface 110 and the button device 130 , the Bluetooth communication circuit 122 is connected to the analog-to-digital conversion circuit 123 , the analog-to-digital conversion circuit 123 is connected to the MCU main core 121 , and the digital-to-analog conversion circuit 124 is connected to the MCU main core 121 and the audio output device 140 .

The Bluetooth communication circuit 122 receives the Bluetooth signal sent by the smart terminal and outputs it to the analog-to-digital conversion circuit 123, and the analog-to-digital conversion circuit 123 performs analog-to-digital conversion on the Bluetooth signal to obtain a digital signal and outputs it to the MCU main core 121, and the MCU main core 121 according to the control signal The corresponding digital signal is acquired and sent to the digital-to-analog conversion circuit 124 , and the digital-to-analog conversion circuit 124 performs digital-to-analog conversion on the received digital signal to obtain an analog audio signal and sends it to the audio output device 140 .

Specifically, the MCU main core 121 is a simple instruction set CPU (Central Processing Unit, central processing unit), supports 32-bit DSP instructions, and performs data receiving and processing operations. The Bluetooth communication circuit 122 can be a dual-mode Bluetooth circuit, and the MCU main core 121 can switch working modes according to the communication status between the dual-mode Bluetooth circuit and the smart terminal. In this embodiment, the dual-mode Bluetooth circuit is a 4.0&2.1+EDR (Enhanced Data Rate, enhanced data rate) dual-mode Bluetooth circuit. The smart terminal matches the headset by turning on the Bluetooth function for media audio transmission. The smart terminal will connect Bluetooth 4.0 and Bluetooth 2.1+EDR during the initial pairing. When the smart terminal is not operating, that is, when no Bluetooth signal is sent, the MCU main core 121 turns off Bluetooth 2.1 and uses Bluetooth 4.0 to connect to the smart terminal. When there is a button operation on the terminal or the earphone, the MCU main core 121 quickly connects to Bluetooth 2.1 to perform related operations. The power consumption of Bluetooth 4.0 is 10% of that of traditional Bluetooth. Switching the working mode according to the communication status of the dual-mode Bluetooth circuit can further reduce energy consumption.

Further, in one embodiment, the Bluetooth communication chip 120 also includes an FM (Frequency Modulation, frequency modulation) receiving circuit 125 connected to the analog-to-digital conversion circuit 123, the FM receiving circuit 125 receives the FM signal and sends it to the analog-to-digital conversion circuit 123, the analog The digital conversion circuit 123 also performs analog-to-digital conversion on the FM signal to obtain a digital signal and outputs it to the MCU main core 121 .

In this embodiment, the FM listening function is provided, and the button functions of the button device 130 may also include mode switching, playing smart terminal audio and listening to FM. After the headset is turned on, the Bluetooth communication chip 120 first detects whether it is connected to the smart terminal. When the smart terminal is connected, the user can switch the mode of the headset through the key device 130. Bluetooth signal for audio playback. When the user chooses to listen to FM, the Bluetooth communication chip 120 receives the FM signal and performs FM playback. The user can also control the audio playback and FM listening through the key device 130 to pause, increase or decrease the volume, and the like. When the earphone does not play audio or listen to FM, if there is no operation beyond the preset time, the Bluetooth communication chip 120 controls the earphone to enter the standby mode, and returns to the mode switch for function selection when the earphone is turned on again.

When the earphone is not connected to the smart terminal, the user can also control the Bluetooth communication chip 120 to receive FM signals for FM playback through the button device 130 . When the earphone is not listening to FM, if there is no operation beyond the preset time, the Bluetooth communication chip 120 can also control the earphone to enter the standby mode, and re-detect the connection to the smart terminal when the earphone is turned on again. In this embodiment, the preset duration is also 10 minutes.

In one embodiment, the audio output device 140 is a passive anti-jamming circuit, which can effectively suppress RF (Radio Frequency, radio frequency) antenna interference and improve signal stability.

In one embodiment, as shown in FIG. 3 , the universal headset further includes an audio input device 160 and a microphone 170 , the audio input device 160 is connected to the Bluetooth communication chip 120 , and the microphone 170 is connected to the audio input device 160 .

The audio input device 160 provides a bias voltage to the sound signal output by the microphone 170, and outputs the sound signal to the Bluetooth communication chip 120 after filtering and amplifying the sound signal. The Bluetooth communication chip 120 converts the received sound signal into a Bluetooth signal and sends it to the smart phone. terminal. The audio input device 160 can be specifically connected to the Bluetooth communication circuit 122 of the Bluetooth communication chip 120, and the audio signal is converted into a Bluetooth signal by the Bluetooth communication circuit 122 and then sent to the smart terminal.

In this embodiment, the voice call function is provided, and the button function of the button device 130 may also include answering a phone call. When the smart terminal is a terminal with a call function, such as a mobile phone, the general-purpose earphone can be used to connect to the call for voice. The smart terminal can convert both audio playback data and voice call data into bluetooth signals, and send them to the bluetooth communication chip 120 as downlink signals. The bluetooth communication chip 120 converts the received sound signal into a bluetooth signal, and sends it to the smart terminal as an uplink signal.

Specifically, when the user switches the mode of the earphone through the button device 130, he can also choose to answer the call, and the Bluetooth communication chip 120 performs a voice call function, controls the earphone to enter the standby mode after the voice call ends, and returns to the mode switch when the earphone is started again. Make function selections.

In order to better understand the above-mentioned general-purpose earphone, a detailed explanation will be given below in conjunction with a specific workflow.

The button functions of the button device 130 include pause, play, mode switching, answering calls, playing smart terminal audio, listening to FM, previous song, next song, increasing and decreasing volume, and switching on and off. After the smart terminal is connected to the headset, the user can play music, listen to FM and make voice calls as needed. Users can also directly enter FM listening without connecting to Bluetooth, manually or automatically search channels, and choose their favorite programs to listen to.

As shown in FIG. 4 , when the earphone is powered on and the user presses the start button in the key device 130 to start the earphone, the Bluetooth communication chip 120 detects whether the earphone is connected to the smart terminal. If the earphone is connected to the smart terminal, the bluetooth communication chip 120 performs function selection according to the control command sent by the key device 130. When selecting to answer the call, the bluetooth communication chip 120 executes the voice call function, and controls the earphone to enter the standby mode after the end of the voice call. When choosing to play smart terminal audio or listen to FM, the Bluetooth communication chip 120 executes the corresponding audio playback or FM playback function, and enters the standby mode after a pause of more than 10 minutes. When the earphone is started again, the Bluetooth communication chip 120 performs function selection again.

If the earphone is not connected to the smart terminal, the user can also control the Bluetooth communication chip 120 to receive FM signals through the button device 130 for FM playback, and enter the standby mode after a pause of more than 10 minutes. When the earphone is started again, the bluetooth communication chip 120 detects whether the earphone is connected to the smart terminal again.

When the user plays music or makes a voice call, the user uses Bluetooth 2.1 for data transmission. When not in operation, the Bluetooth communication chip 120 disconnects the Bluetooth 2.1. At this time, only Bluetooth 4.0 is used for connection, which can save power consumption to the greatest extent. Bluetooth can The background is always connected to the smart terminal.

When the earphone is connected to the smart terminal, no matter whether the user is using the earphone to listen to music, or the earphone is in the standby state, when the smart terminal has an incoming call, the earphone will actively connect to Bluetooth 2.1 and play a prompt tone to remind the user answer the phone.

When the headset is not operated for a long time, and the smart terminal does not play music or make voice calls during this period, the headset will automatically enter the standby state, which is the state with the lowest power consumption. In this state, if it was connected to the smart terminal before, the headset will automatically wake up when there is an incoming call, reminding the user to answer the call.

The above-mentioned general-purpose headset connects the output voltage of the intelligent terminal through the power interface to supply power to the Bluetooth communication chip, without installing a battery for power supply, which reduces the volume of the headset, reduces the cost of the headset, and improves the working life of the headset. Wireless communication between the Bluetooth communication chip and the smart terminal for data transmission to realize the audio playback function, avoiding the audio quality affected by the quality of the audio interface and transmission line, and because it does not need to communicate with the smart terminal through the data line, no need to use relevant smart terminal authentication The advanced communication chip, the data transmission communication protocol is simple, the development cycle is shorter, and the production cost of the headset is further reduced.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a kind of general headset, it is characterised in that including power interface, Bluetooth communication chip, key device, audio output dress Put and loudspeaker, the power interface connects the Bluetooth communication chip, and for being connected with intelligent terminal, the Bluetooth communication Chip connect the key device and the audio output device, the Bluetooth communication chip be additionally operable to the intelligent terminal without Line is communicated to connect, and the audio output device connects the loudspeaker,

The voltage that the power interface is used to access the intelligent terminal output is powered to the Bluetooth communication chip；The bluetooth Communication chip is used to receive the control signal that the key device sends, and receives the Bluetooth signal that the intelligent terminal sends；Institute State Bluetooth communication chip analog-to-digital conversion is carried out to the Bluetooth signal and obtain data signal, correspondence is obtained according to the control signal Data signal carry out digital-to-analogue conversion and obtain simulated audio signal, and exported to described by the audio output device and raise one's voice Device.

2. general headset according to claim 1, it is characterised in that the Bluetooth communication chip includes the main cores of MCU, indigo plant Tooth telecommunication circuit, analog to digital conversion circuit and D/A converting circuit, the main cores of MCU connect the power interface and button dress Put, the bluetooth communication circuit connects analog-digital conversion circuit as described, and analog-digital conversion circuit as described connects the main cores of MCU, described D/A converting circuit connects the main cores of MCU and the audio output device,

The bluetooth communication circuit receives the Bluetooth signal of the intelligent terminal transmission and exports to analog-digital conversion circuit as described, institute State analog to digital conversion circuit the Bluetooth signal is carried out analog-to-digital conversion obtain data signal and export to the main cores of the MCU, it is described The main cores of MCU obtain corresponding data signal and send to the D/A converting circuit according to the control signal, and the digital-to-analogue turns Changing circuit carries out that digital-to-analogue conversion obtains simulated audio signal and transmission is to the audio output device to the data signal for receiving.

3. general headset according to claim 2, it is characterised in that the main cores of MCU are simple instruction set CPU.

4. general headset according to claim 2, it is characterised in that the bluetooth communication circuit is bimodulus bluetooth electricity Road.

5. general headset according to claim 3, it is characterised in that the bimodulus Bluetooth circuit is 4.0＆2.1+EDR Bimodulus Bluetooth circuit.

6. general headset according to claim 2, it is characterised in that the Bluetooth communication chip also includes that connection is described The FM receiving circuits of analog to digital conversion circuit, the FM receiving circuits receive FM signals and send to analog-digital conversion circuit as described, institute State analog to digital conversion circuit analog-to-digital conversion is also carried out to the FM signals and obtain data signal and export to the main cores of the MCU.

7. general headset according to claim 1, it is characterised in that also including voice input device and microphone, institute State voice input device and connect the Bluetooth communication chip, the microphone connects the voice input device,

The voice input device voice signal that the microphone is exported is filtered and enhanced processing after export to described Bluetooth communication chip, the Bluetooth communication chip is sent to the intelligence eventually after the voice signal of reception is converted into Bluetooth signal End.

8. general headset according to claim 1, it is characterised in that the audio output device is passive anti-interference electricity Road.

9. general headset according to claim 1, it is characterised in that the integrated MCU core of Bluetooth communication chip Piece.

10. the general headset according to claim 1-9 any one, it is characterised in that the power interface includes connecting Connect at least one in lighting interfaces, micro interfaces and the USB interface of the Bluetooth communication chip.