CN201111915Y - Bluetooth Car MP3 Player - Google Patents

Abstract

The utility model relates to an audio player, in particular to a Bluetooth vehicle MP3 combined with a Bluetooth hands-free and a vehicle MP3, with a built-in microphone and a built-in speaker, which consists of a main control module, an MP3 function module, a Bluetooth function module, an FM Composed of transmitting modules; the main control module is connected with the FM transmitting module through electronic circuits; the Bluetooth function module has two circuits connected to an electronic single-pole double-throw switch, and the electronic single-pole double-throw switch has two other circuits through the power amplifier 9 and the built-in speaker 10 Connection; the independent power supply 11 is connected with the MP3 function module 2 and the FM transmitting module 4, the main power supply 12 is connected with the Bluetooth function module 3; the built-in microphone 19 is connected with the Bluetooth function module 3. The utility model is a combination of Bluetooth hands-free and vehicle-mounted MP3, which enables users to safely answer calls during driving, and the FM transmitter module transmits FM signals to car audio through the antenna, making full use of the audio resources in the car.

Description

Bluetooth Car MP3 Player

technical field

The utility model relates to an audio player, in particular to a bluetooth vehicle-mounted MP3 which is combined with a Bluetooth hands-free and a vehicle-mounted MP3 and has a built-in microphone and a built-in speaker.

Background technique

MP3 audio player has been widely used for its small size and complete functions. But the existing MP3 audio player can only play audio files. People can only wear earphones to enjoy music while driving. Answer, it is easy to cause the danger of driving. In addition, existing MP3 audio players cannot utilize the audio equipment in the car.

Utility model content

The technical problem to be solved by the utility model is to provide a Bluetooth vehicle-mounted MP3 player which integrates MP3 audio playback, mobile phone Bluetooth hands-free, and vehicle-mounted playback.

For solving the problems of the technologies described above, the utility model is realized in the following manner: the bluetooth vehicle-mounted MP3 player described in the utility model is made up of main control module, MP3 function module, bluetooth function module, FM transmission module; The electronic circuit is connected with the FM transmitting module, which is used to set the transmitting frequency of the FM transmitting module; the main control module is connected with the display screen through the electronic circuit, and the display screen can display the set frequency point, the volume, and the information of the played song; The main control module is connected with the electric erasable programmable read-only memory (EEPROM) through the electronic circuit, and the electric erasable programmable read-only memory (EEPROM) is used for frequency point memory and storing audio data; the main control module is connected with the electronic circuit through the electronic circuit After the main power control circuit is connected, it is connected to the Bluetooth function module. The Bluetooth function module has two circuits connected to an electronic single-pole double-throw switch. The MP3 function module is connected to the FM transmitter module through two electronic circuits, and the FM transmitter module converts the MP3 audio signal Into frequency modulation (FM) signal, the electronic single-pole double-throw switch leads to two lines, respectively connected to the two lines of the MP3 function module and the FM transmitter module, and the main control module has a line connected to the Bluetooth function module for Bluetooth call status monitoring , when there is a phone call, the electronic SPDT switch cuts off the MP3 audio signal and connects the Bluetooth phone signal. When the call is over, the electronic SPDT switch turns on the MP3 audio signal and resumes MP3 audio playback; Another two lines of the switch are connected to the built-in speaker through the power amplifier. After the FM frequency modulation is interrupted, the audio signal can be played directly through the built-in speaker; the separate power supply is connected to the MP3 function module and the FM transmitter module, and the main power supply is connected to the Bluetooth function module; the built-in microphone Connect with the Bluetooth function module to pick up the voice signal and send it to the Bluetooth function module; the key circuit is connected with the main control module, the MP3 function module and the Bluetooth function module respectively; the power status indicator light (LED1) is connected with the main power supply and the Bluetooth function module Connection, MP3 playback status indicator (LED2) is connected to MP3 function module and Bluetooth function module, Bluetooth working status indicator (LED3) is connected to Bluetooth function module, separate power status indicator (LED4) and built-in speaker indicator (LED5) Connect with the electronic single-pole double-throw switch respectively.

The button circuit is provided with seven buttons, which are main power switch, FM+, FM-, previous song/volume-, next song/volume+, MP3 play/pause/stop key, bluetooth key; main power switch , FM+, FM- are connected to the main control module, the main power switch is used to control the power of the main control module and the Bluetooth function module, FM+, FM- are used to increase and decrease the FM frequency; previous song/volume-, next song /Volume+ is connected with the MP3 function module and the Bluetooth function module. In the process of playing MP audio, short press for the previous song and next song. Long press for adjusting the volume of MP3. During the Bluetooth call, short press for adjustment Bluetooth call volume, press and hold to adjust the microphone gain; MP3 play/pause/stop button is connected to the Bluetooth function module to control MP3 playback, long press to stop; Bluetooth button is connected to the Bluetooth function module to control Bluetooth operation.

The bluetooth function module is connected to the non-bluetooth external mobile phone interface circuit, and is used to realize the audio output and microphone input of the non-bluetooth mobile phone, and realizes hands-free operation. The bluetooth function module is provided with an echo cancellation module.

The FM transmitting module is connected with an antenna, and the antenna transmits a frequency modulation (FM) signal to the car stereo, and realizes audio stereo playback through the car stereo.

The display screen is a four-digit eight-segment digital tube.

The power supply has a rechargeable lithium battery, and has a charging circuit and a charging port.

The positive effect of the utility model is that the utility model is a collection of Bluetooth hands-free and vehicle-mounted MP3. The FM radio can be used in the car, which is very convenient; its bluetooth function module can realize the basic bluetooth hands-free function, so that users can safely answer the phone during driving; the FM transmitter module can realize the conversion of audio signals, The FM signal is transmitted to the car audio, and the user can enjoy stereo music without wearing headphones, making full use of the audio resources in the car.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is the circuit block diagram of the preferred embodiment of the present utility model

Fig. 2 is the schematic circuit diagram of the preferred embodiment of the present utility model

Fig. 3 is a circuit diagram of the main control module (1) and its auxiliary components

Fig. 4 is the circuit diagram of the MP3 functional module (2) and its auxiliary components

Fig. 5 is a circuit diagram of the bluetooth function module (3) and its auxiliary components

Fig. 6 is a circuit diagram of the FM transmitting module (4) and its auxiliary components

Fig. 7 is the circuit diagram of display screen (5) and its auxiliary components

Fig. 8 is a circuit diagram of the main power supply control circuit (7) and its auxiliary components

Fig. 9 is a circuit diagram of an electronic single-pole double-throw switch (8) and its auxiliary components

Fig. 10 is a circuit diagram of power amplifier (9) and its auxiliary components

Fig. 11 is a circuit diagram of a separate power supply (11) and its auxiliary components

Fig. 12 is a circuit diagram of main power supply (12) and its auxiliary components

Fig. 13 is a circuit diagram of button circuit (13)

Fig. 14 is the circuit diagram of antenna (21) and its auxiliary components

In the figure, 1 main control module 2 MP3 function module 3 Bluetooth function module

4FM transmitter module 5 display screen 6 electrically erasable programmable read-only memory

7 Main power control circuit 8 Electronic single-pole double-throw switch 9 Power amplifier

10 built-in speaker 11 separate power supply 12 main power supply

13 key circuit 14 power status indicator light

15 MP3 playback status indicator 16 Bluetooth working status indicator

17 Separate power status indicator light 18 Built-in horn indicator light

19 Built-in microphone 20 Non-Bluetooth external mobile phone interface circuit

21 antennas

Detailed ways

As shown in Figure 1, the bluetooth vehicle-mounted MP3 player described in the utility model is made up of main control module 1, MP3 function module 2, bluetooth function module 3, FM transmission module 4; 4 connections, used to set the transmission frequency of the FM transmission module 4; the main control module 1 is connected with the display screen 5 through the electronic circuit, and the display screen 5 can display the information of the set frequency point, the volume, and the played song; The control module 1 is connected with the electrically erasable programmable read-only memory (EEPROM) 6 through an electronic circuit, and the electrically erasable programmable read-only memory (EEPROM) 6 is used for frequency point memory and storage audio data; the main control module 1 passes After the electronic circuit is connected with the main power control circuit 7, it is connected to the Bluetooth function module 3. The Bluetooth function module 3 has two circuits connected to an electronic single-pole double-throw switch 8. The MP3 function module 2 is connected to the FM transmitter module 4 through two electronic circuits. , the FM transmitter module 4 converts the MP3 audio signal into a frequency modulation (FM) signal, and the electronic single-pole double-throw switch 8 draws two lines, which are connected to the two lines of the FM transmitter module 4 with the MP3 functional module 2 respectively, and the main control module 1 has One line is connected with the bluetooth function module 3, and is used for the monitoring of bluetooth call state, and when a phone is connected, the electronic single pole double throw switch 8 cuts off the MP3 audio signal, connects the bluetooth phone signal, and when the call ends, the electronic single pole double throw switch 8 The switch 8 turns on the MP3 audio signal again, and resumes the MP3 audio playback; the electronic SPDT switch 8 has two other lines connected with the built-in speaker 10 through the power amplifier 9, and after the FM frequency modulation is interrupted, the audio signal can be played directly through the built-in speaker 10; Separate power supply 11 is connected with MP3 functional module 2 and FM transmitting module 4, and main power supply 12 is connected with bluetooth functional module 3; Built-in microphone 19 is connected with bluetooth functional module 3, is used for picking up voice signal and transmits to bluetooth functional module 3; Button circuit 13 is connected with main control module 1, MP3 function module 2 and bluetooth function module 3 respectively; The function module 2 and the Bluetooth function module 3 are connected, the Bluetooth working status indicator light (LED3) 16 is connected with the Bluetooth function module 3, the separate power supply status indicator light (LED4) 17 and the built-in horn indicator light (LED5) 18 are respectively connected to the electronic SPDT The switch 8 is connected to display the working status of the independent power supply 11 and the built-in speaker 10 respectively.

Described button circuit 13 is provided with seven buttons, and they are main power switch, FM+, FM-, last song/volume-, next song/volume+, MP3 play/pause/stop key, bluetooth key; Switches, FM+, FM- are connected to the main control module, the main power switch is used to control the power of the main control module and the Bluetooth function module, FM+, FM- are used to increase and decrease the FM frequency; previous song/volume-, next First/Volume+ is connected with the MP3 function module and the Bluetooth function module. In the process of playing MP audio, short press for the previous song and next song. Long press for adjusting the volume of MP3. During the Bluetooth call, short press for adjustment Bluetooth call volume, press and hold to adjust the microphone gain; MP3 play/pause/stop button is connected to the Bluetooth function module to control MP3 playback, long press to stop; Bluetooth button is connected to the Bluetooth function module to control Bluetooth operation.

The bluetooth functional module 3 is connected to the non-bluetooth external mobile phone interface circuit 20 to realize audio output and microphone input of the non-bluetooth mobile phone to realize hands-free operation. The bluetooth functional module 3 is provided with an echo cancellation module.

The FM transmitting module 4 is connected with an antenna 21, and the antenna transmits the frequency modulation (FM) signal to the car stereo, and realizes stereo audio playback through the car stereo.

The display screen 5 is a four-digit eight-segment digital tube.

The main power supply 12 has a rechargeable lithium battery, and has a charging circuit and a charging port.

The schematic circuit diagram of the preferred embodiment of the utility model is shown in Fig. 2 .

Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13 and Fig. 14 are partial circuit diagrams of each module of the present utility model, and each element label among the figures is the same The pins are connected to each other.

The utility model organically combines the bluetooth hands-free with the vehicle-mounted MP3 player. The Bluetooth module can realize the basic Bluetooth hands-free function. The Bluetooth audio can be output to the built-in speaker through the power amplifier. If FM is turned on, it will be transmitted to the car stereo through FM, and the built-in speaker will be turned off. The MP3 function module can search and play MP3 songs in the SD card or U disk, and the stereo music is sent to the car stereo through FM. The frequency of the FM function module can be set and adjusted by the main control module, and the frequency value can be displayed by four eight-segment LED displays. If there is a phone connection during audio playback, the music will be suspended, and the FM will transmit Bluetooth audio. When the call ends , the audio will automatically resume playing. The specific operation process is as follows:

1) Turn on: Press and hold the power button for 2 seconds to turn on the power, the whole machine is powered on, the built-in speaker emits a Bluetooth power-on prompt tone and then turns off, the display shows "On" for 2 seconds and then displays the FM frequency point, and it turns off automatically after 10 seconds. If you want to enjoy MP3 music, turn on the car stereo and tune to the corresponding frequency point, insert the memory card to play music.

2) Shutdown: In the power-on state, press and hold the power button for 2 seconds, and the display will display "OFF" for 1 second, then shut down.

3) FM transmitter module and MP3 function module power control: the power supply of FM transmitter module and MP3 function module can be controlled by Bluetooth module and main control module, that is, as long as any one of them turns on the power control, the power supply of FM transmitter module and MP3 function module will be is turned on; after starting up, the FM frequency point will be displayed for 10 seconds, and at the same time the power of the FM transmitter module and MP3 function module will be turned on (LED4 is on, LED5 is off), if there is no FM frequency point during this period One adjustment, the display will display "----" for 1 second, then turn off the power control pins of the FM transmitter module and MP3 function module (LED4 off, LED5 on) to save power, if there is a Bluetooth call during this period, wait until Turn off the power after the call is over, short press the "Power" button once, you can immediately turn off the power of the FM transmitter module and MP3 function module; if you short press FM+ or FM- again, the power of the FM transmitter module and MP3 function module will be turned on again , the frequency point is displayed again, and enters the above cycle of judgment; after starting up, MP3 will not play automatically, short press the play button once, you can also turn on the power control of the FM transmitter module and MP3 function module, after a delay of 0.5 seconds, if If no MP3 playback is detected within 60 seconds, or no Bluetooth call occurs, turn off the power of the FM transmitter module and the MP3 functional module, and if the audio playback is paused or stopped, if no MP3 playback status is detected within 90 seconds, or no Bluetooth call occurs occurs, then also turn off the power supply of the FM transmitter module and the MP3 function module.

4) Select the frequency point: short press FM+ or FM-, the frequency point will increase or decrease by 0.1MHz in turn, and long press FM+ or FM- for more than 2 seconds, the frequency point will rise and fall rapidly. You can watch the value displayed on the display screen, lift FM+ or FM- to stop, the frequency point will automatically turn off after 10 seconds to save power, short press FM+ or FM- will activate the display again, the set value of the frequency point should be able to be remembered , that is, after rebooting, the last set value will be restored.

5) Play/Pause/Stop: After power on, the MP3 will not play automatically, only press the play button to start playing, and the button will be blocked in the Bluetooth call state. The pause/stop operation only works when the MP3 playback status bit is detected as playing, short press for pause, long press for stop.

6) Song selection: When playing MP3, short press the previous or next button to select the previous or next song.

7) Play volume adjustment: When playing MP3, press and hold the volume + or volume - button for more than 2 seconds to increase or decrease the volume.

8) Bluetooth pairing and connection: In the power-on state and not connected to the Bluetooth mobile phone in the standby state (LED3 flashes slowly for 5 seconds), and the MP3 is not playing (LED2 is off), press the Bluetooth key and the volume - key at the same time for more than 3 seconds , hands-free to enter the Bluetooth pairing state, at this time LED1 and LED3 flash alternately (interval 0.5 seconds), take out the Bluetooth mobile phone to search for Bluetooth devices, when you find BTLinx, key in the security code "0000" to complete the Bluetooth pairing, hands-free automatically return to In standby mode, establish a Bluetooth connection with the BTLinx from the Bluetooth mobile phone, and at this time LED3 is always on. When the pairing is not completed within 90 seconds, the handsfree will automatically return to the standby state. The Bluetooth hands-free can remember up to 4 paired Bluetooth mobile phones. Every time the hands-free is turned on, it will automatically search for the paired devices and try to establish a Bluetooth connection with them (about 14 seconds). The most recently connected Bluetooth phone has the highest priority. When the 5th Bluetooth mobile phone enters, it will kick off the first connected mobile phone.

9) Automatically search for paired devices and connect: In the standby state (LED3 flashes slowly for 5 seconds) when it is turned on and not connected to a Bluetooth mobile phone, short press the Bluetooth button, and the handsfree will automatically search for the paired device and try to establish a Bluetooth connection with it ( about 14 seconds).

10) Answer the call: Short press the Bluetooth button when a call comes in. The MP3 playback status bit should also be detected during the Bluetooth call. If music playback occurs, an MP3 pause signal will be sent.

11) Hang up: Short press the Bluetooth button during a call.

12) Call transfer: Press and hold the Bluetooth button for 2 seconds during a call, and the call will be transferred back to the mobile phone. If the Bluetooth connection is not broken, press and hold the Bluetooth button for 2 seconds to switch back to hands-free.

13) Reject call: When the mobile phone calls, press and hold for 2 seconds to reject the call.

14) Voice dialing: In the state of Bluetooth connection, press the Bluetooth key for 2 seconds to activate the voice dialing function of the mobile phone. After the "beep" prompt tone, speak out the voice tag pre-stored in the mobile phone to realize voice dialing (need to be determined in advance) Whether the Bluetooth mobile phone supports this function). To cancel voice dialing, short press the Bluetooth key once.

15) Redial the last number of the mobile phone: In the state of Bluetooth connection, short press the Bluetooth button twice, and the last number of the mobile phone will be dialed out. Short press the Bluetooth button once to cancel.

16) Call volume adjustment: Short press volume + or volume - during a call to increase or decrease the volume.

Claims (6)

1, a bluetooth vehicle-mounted MP3 player, is characterized in that: it is made up of master control module (1), MP3 function module (2) bluetooth function module (3), FM transmitting module (4); Master control module (1) Connect with FM transmission module (4) by electronic circuit, be used to set the transmission frequency of FM transmission module (4); Main control module (1) is connected with display screen (5) by electronic circuit, display screen (5) can display The set frequency point and the volume, the information of the played song; the main control module (1) is connected with the EEPROM (6) through the electronic circuit, and the EEPROM (6) 6) Used for frequency point memory and storage of audio data; the main control module (1) is connected to the Bluetooth function module (3) after being connected to the main power control circuit (7) through an electronic circuit, and the Bluetooth function module (3) has two connections On an electronic SPDT switch (8), the MP3 functional module (2) is connected with the FM transmitting module (4) by two electronic circuits, and the FM transmitting module (4) converts the MP3 audio signal into a frequency modulation (FM) signal, The electronic single-pole double-throw switch (8) draws two lines, which are respectively connected with the two lines of the MP3 function module (2) connected to the FM transmitter module (4), and the main control module (1) has a line connected to the Bluetooth function module (3) Connection, used for monitoring the status of Bluetooth calls. When a call is connected, the electronic SPDT switch (8) cuts off the MP3 audio signal and connects the Bluetooth phone signal. After the call is over, the electronic SPDT switch (8) Turn on the MP3 audio signal again to resume MP3 audio playback; the electronic SPDT switch (8) has two other lines connected with the built-in speaker (10) through the power amplifier (9), and after interrupting FM frequency modulation, the audio signal can directly pass through the built-in Loudspeaker (10) plays; Separate power supply (11) is connected with MP3 function module (2) and FM transmitting module (4), and main power supply (12) is connected with Bluetooth function module (3); Built-in microphone (19) and Bluetooth function module (3) connect, be used for picking up speech signal and transmit to bluetooth function module (3); Button circuit (13) is connected with main control module (1), MP3 function module (2) and bluetooth function module (3) respectively; The power status indicator light (LED1) is connected to the main power supply (12) and the Bluetooth function module (3), the MP3 playback status indicator light (LED2) is connected to the MP3 function module (2) and the Bluetooth function module (3), and the Bluetooth working status indication The light (LED3) is connected with the Bluetooth function module (3), the separate power supply status indicator light (LED4) and the built-in horn indicator light (LED5) are connected with the electronic single-pole double-throw switch (8) respectively, and the separate power supply (11) and The working state of the built-in horn (10). 2, according to the described bluetooth vehicle-mounted MP3 player of claim 1, it is characterized in that: described button circuit (13) is provided with seven buttons, and they are main power switch, FM+, FM-, last song/volume- , next song/volume+, MP3 play/pause/stop button, Bluetooth button; the main power switch, FM+, FM- are connected to the main control module, the main power switch is used to control the power supply of the main control module and the Bluetooth function module, FM+ , FM- is used to increase and decrease the FM frequency; Previous/Volume-, Next/Volume+ are connected with the MP3 function module and the Bluetooth function module. One, long press to adjust the volume of MP3, during the Bluetooth call, short press to adjust the volume of the Bluetooth call, long press to adjust the gain of the microphone; the MP3 play/pause/stop button is connected to the Bluetooth function module to control MP3 playback, long press to stop; the Bluetooth key is connected with the Bluetooth function module to control the operation of the Bluetooth. 3, according to the described bluetooth vehicle-mounted MP3 player of claim 1, it is characterized in that: described bluetooth function module (3) connects non-bluetooth external mobile phone interface circuit (20), is used for realizing the audio frequency output and the microphone input of non-bluetooth mobile phone , to achieve hands-free operation, the Bluetooth function module (3) is provided with an echo cancellation module. 4, according to the described bluetooth vehicle-mounted MP3 player of claim 1, it is characterized in that: described FM transmission module (4) is connected with antenna (21), and antenna transmits FM signal to car stereo, realizes audio stereo by car stereo play. 5. The bluetooth vehicle-mounted MP3 player according to claim 1, characterized in that: the display screen (5) is a four-digit eight-segment digital tube. 6. The bluetooth vehicle-mounted MP3 player according to claim 1, characterized in that: the main power supply (12) has a rechargeable lithium battery, and has a charging circuit and a charging port.

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