CN213754941U

CN213754941U - Sound box with digital signal broadcasting and Bluetooth functions

Info

Publication number: CN213754941U
Application number: CN202120080909.8U
Authority: CN
Inventors: 陈楚鑫; 农建伟
Original assignee: Shenzhen Lanfeng Shidai Industrial Co ltd
Current assignee: Shenzhen Lanfeng Shidai Industrial Co ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-07-20
Anticipated expiration: 2031-01-13

Abstract

The utility model discloses an audio amplifier with digital signal broadcasting and bluetooth function includes power module, digital signal broadcasting module, bluetooth module, audio channel switching circuit module and play module, digital signal broadcasting module's volume control output interface is connected with bluetooth module's volume control input interface, digital signal broadcasting module's control signal output interface is connected with audio channel switching circuit module's control signal input interface, digital signal broadcasting module's audio signal output interface is connected with audio channel switching circuit module's a set of audio signal input interface, the utility model discloses it adopts the digital signal broadcasting mode, can make the audio amplifier receive the platform can reach harmless stereo tone quality ability, does not receive multiple path interference influence in certain extent to guarantee fixedly, carry and remove and receive the high quality.

Description

Sound box with digital signal broadcasting and Bluetooth functions

Technical Field

The utility model discloses a sound box, especially a sound box with digital signal broadcasting and bluetooth function belongs to the electronic consumption class sound box circuit technology field.

Background

Fm broadcasting is a medium for sound transmission, in which an audio signal is transmitted in a fm mode, a carrier of a fm wave changes on both sides of a carrier center frequency (center frequency before unmodulation) with a change of an audio modulation signal, the frequency offset change frequency per second is identical to the modulation frequency of the audio signal, and the frequency offset change frequency of the carrier is also 500 times per second if the frequency of the audio signal is 500 HZ. The magnitude of the frequency offset is dependent on the magnitude of the amplitude of the audio signal. However, in the conventional wireless broadcasting, there are serious problems of poor coverage effect and waste of broadcasting frequency resources, and signals are easily interfered, and have poor radio reception effect and poor sound quality, so that more information of radio station information cannot be obtained.

At present, a sound box of frequency modulation broadcasting cannot be electrified to automatically update time, the noise resistance is weak, the anti-interference capability is weak, the sound box receiving station of frequency modulation broadcasting cannot achieve lossless stereo tone quality, signals are distorted, and the sound box is not suitable for playing music.

Disclosure of Invention

The audio amplifier that the frequency modulation broadcast among the prior art mentioned to the aforesaid receives the platform can not reach the problem of harmless stereo tone quality, the utility model provides a have digital signal broadcast and bluetooth function's audio amplifier, it adopts digital signal broadcast mode, can make the audio amplifier receive the platform can reach harmless stereo tone quality ability, does not receive multiple path interference influence in the certain limit to guarantee fixed, carry and remove and receive the high quality.

The utility model provides a technical scheme that its technical problem adopted is: a sound box with digital signal broadcasting and Bluetooth functions comprises a power module, a digital signal broadcasting module, a Bluetooth module, an audio channel switching circuit module and a playing module, wherein a volume control output interface of the digital signal broadcasting module is connected with a volume control input interface of the Bluetooth module, a control signal output interface of the digital signal broadcasting module is connected with a control signal input interface of the audio channel switching circuit module, an audio signal output interface of the digital signal broadcasting module is connected with one group of audio signal input interfaces of the audio channel switching circuit module, an audio signal output interface of the Bluetooth module is connected with the other group of audio signal input interfaces of the audio channel switching circuit module, and an audio signal input interface of the playing module is connected with an audio signal output interface of the audio channel switching circuit module, the power module is used for supplying power.

The power supply module comprises a USB interface, a power chip U4, a battery and a voltage reduction chip U6, wherein a power output port of the USB interface is connected with a power output pin of the power chip U4, a battery power pin of the power chip U4 is connected with the battery through a battery power interface, a battery power pin of the power chip U4 is connected with a power input pin of the voltage reduction chip U6, and a power output pin of the voltage reduction chip U6 outputs 3.3V power.

The audio channel switching circuit module adopts an audio channel switching chip IC201, one general I/O pin of the digital signal broadcasting module is connected with a clock pin of the audio channel switching chip IC201, and a second general I/O pin of the digital signal broadcasting module is connected with a data pin of the audio channel switching chip IC 201.

The Bluetooth module comprises a boosting chip U7 and a Bluetooth chip U1, a power input pin of the boosting chip U7 is connected with an output end of the power module, a power output pin of the boosting chip U7 is connected with a battery power pin of the Bluetooth chip U1, a third general I/O pin of the digital signal broadcasting chip is connected with an enabling pin of the boosting chip U7, a fourth general I/O pin of the digital signal broadcasting chip is connected with a first volume control pin of the Bluetooth chip U1, a fifth general I/O pin of the digital signal broadcasting chip is connected with a second volume control pin of the Bluetooth chip U1, and a sixth general I/O pin of the digital signal broadcasting chip is connected with a volume control pin of the Bluetooth chip U1.

One of the right channel input pins of the audio channel switching chip IC201 is connected with the common end of a voltage dividing resistor R203 and a voltage dividing resistor R201 through a capacitor C201, the voltage dividing resistor R203 is grounded, the voltage dividing resistor R201 is connected with the right audio output pin of the digital broadcasting chip, the pin of the right channel input after audio processing of the audio channel switching chip IC201 is connected with the right channel gain selection output pin of the audio channel switching chip IC201 through a capacitor C209, one of the left channel input pins of the audio channel switching chip IC201 is connected with the common end of a voltage dividing resistor R204 and a voltage dividing resistor R202 through a capacitor C202, the voltage dividing resistor R204 is grounded, the voltage dividing resistor R202 is connected with the left audio output pin of the digital broadcasting chip, one of the right channel input pins of the audio channel switching chip IC201 is connected with the common end of a voltage dividing resistor R68 and a voltage dividing resistor R57 through a capacitor C56, the divider resistor R68 is grounded, the divider resistor R57 is connected with the pin of the D/A conversion right channel of the Bluetooth chip U1, one of the left channel input pins of the audio channel switching chip IC201 is connected with the common end of the divider resistor R72 and the divider resistor R70 through the capacitor C57, the divider resistor R72 is grounded, and the divider resistor R70 is connected with the pin of the D/A conversion left channel of the Bluetooth chip U1.

The digital signal broadcasting chip is connected with a key module, one analog/digital conversion pin of the digital signal broadcasting chip is connected with one output end of the key module, the other analog/digital conversion pin of the digital signal broadcasting chip is connected with the other output end of the key module, the first output end of the key module is connected with the 1.8V power supply end of the voltage reduction chip U6 through a pull-up resistor R32, the second output port of the key module is connected with the 1.8V power supply end of the voltage reduction chip U6 through a pull-up resistor R126, the first output end of the key module is connected with one switch pin of the switch chip U2 through a resistor R936, a resistor R937, a resistor R938, a resistor R22, a resistor R19, a resistor R27 and a resistor R55 which are connected in series, a common end between the resistor R936 and the resistor R937 is grounded through a key S8, a common end between the resistor R937 and the resistor R938 is grounded through a key S9, the common terminal between the resistor R938 and the resistor R22 is grounded through a key S10, the common terminal between the resistor R22 and the resistor R19 is grounded through a key S11, the common terminal between the resistor R19 and the resistor R27 is grounded through a key S2, one of the analog/digital conversion pins of the digital signal broadcasting chip of the key module is connected with the other switch pin of the switch chip U2 through a resistor R929, a resistor R931, a resistor R933, a resistor R934, a resistor R935 and a resistor R25 which are connected in series, the common terminal between the resistor R931 and the resistor R932 is grounded through a key S3, the common terminal between the resistor R932 and the resistor R933 is grounded through a key S4, the common terminal between the resistor R933 and the resistor R934 is grounded through a key S5, the common terminal between the resistor R934 and the resistor R935 is grounded through a key S6, the common terminal between the resistor R929 and the resistor R931 and the emitter of the transistor Q7 are connected with the collector of the transistor Q7, and the collector of the transistor Q7 are grounded, the common end of the divider resistor R909 and the divider resistor R28 is connected with the base of the triode Q7, the divider resistor R28 is grounded, the divider resistor R909 is connected with the anode of the diode D405, the battery power output port of the power module is connected with the battery power port of the key module, the battery power port of the key module is connected with the source of the MOS tube, the drain of the MOS tube is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the resistor R909.

The left channel output pin of the audio channel switching chip IC201 is connected to the left audio input interface of the playing module, and the right channel output pin of the audio channel switching chip IC201 is connected to the right audio input interface of the playing module.

The playing module comprises an ear playing module and a power amplifier module, the ear playing module comprises an ear playing chip U3, a left audio in-phase input pin of an ear playing chip U3 is connected with a left channel output pin of an audio channel switching chip IC201, a right audio in-phase input pin of an ear playing chip U3 is connected with a right channel output pin of the audio channel switching chip IC201, a right audio output pin of an ear playing chip U3 is connected with a right channel interface of an earphone J1, and a left audio output pin of an ear playing chip U3 is connected with a left channel interface of an earphone J1; the power amplifier module comprises an active power amplifier chip U2, an audio input pin of the power amplifier chip U2 is connected with a right channel output pin of the audio channel switching chip IC201, an audio input pin of the power amplifier chip U2 is connected with a left channel output pin of the audio channel switching chip IC201, a positive phase audio output pin of the power amplifier chip U2 is connected with an interface CON2 of the loudspeaker, and a negative phase audio output pin of the power amplifier chip U2 is connected with an interface CON2 of the loudspeaker.

The battery power pin of the power chip U4 is connected with the source of a MOS tube, the gate of the MOS tube is connected with the common end of a divider resistor R405 and a divider resistor R406, the divider resistor R405 is connected with the battery power pin of the power chip U4, the divider resistor R406 is connected with the collector of a triode Q4, the drain of the MOS tube is connected with the power output end, the power output end of a USB interface is connected with the anode of a diode D4, the base of the triode Q4 is connected with the divider resistor R407 and the divider resistor R422, the divider resistor R407 is connected with the cathode of a diode D4, the divider resistor R407 is connected with the cathode of the diode D405, the divider resistor R407 is connected with the cathode of the diode D404, the resistor R422 is grounded, the anode of the diode D404 is connected with the divider resistor R420 and the divider resistor R421, the divider resistor R420 is connected with one of the general I/O pins of the digital signal broadcasting module, the voltage dividing resistor R421 is grounded.

The utility model has the advantages that: the utility model discloses audio amplifier with digital signal broadcasting and bluetooth function is connected with digital signal broadcasting module and bluetooth module, can be so that the audio amplifier goes up automatic update time information, the noise immunity, the interference killing feature is strong, receive the platform and can reach CD level harmless stereo tone quality more, the almost zero distortion of signal, be particularly suitable for broadcasting "classical music", "symphony" and "popular music" etc., extremely receive professional music people, do not receive multiple path interference influence in certain extent, in order to guarantee fixedly, carry and remove and receive high quality, bluetooth module has been increased on the audio amplifier, support A2DP, the AVRCP agreement can realize fixed equipment, the short distance data interchange between mobile device and the building personal area network, can connect cell-phone broadcast music, the phone is handfree to answer, more and more humanized and intelligent, use experience better with the customer.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Drawings

Fig. 1 is a block diagram of the circuit of the present invention.

Fig. 2 is a schematic diagram of a digital signal broadcasting module according to the present invention.

Fig. 3 is a schematic diagram of a power module according to the present invention.

Fig. 4 is a schematic diagram of an audio channel switching circuit module according to the present invention.

Fig. 5 is a schematic diagram of a bluetooth module of the present invention.

Fig. 6 is a schematic diagram of a key module according to the present invention.

Fig. 7 is a schematic diagram of a power amplifier module according to the present invention.

Fig. 8 is a schematic diagram of an ear placing module in the present invention.

Fig. 9 is a schematic diagram of a display module according to the present invention.

Detailed Description

The embodiment is a preferred embodiment of the present invention, and other principles and basic structures are the same as or similar to those of the embodiment, and are within the protection scope of the present invention.

Please refer to fig. 1 to 9 in combination, the present invention is a sound box with digital signal broadcasting and bluetooth functions, which comprises a power module, a digital signal broadcasting module, a bluetooth module, an audio channel switching circuit module and a playing module, wherein a volume control output interface of the digital signal broadcasting module is connected to a volume control input interface of the bluetooth module, a control signal output interface of the digital signal broadcasting module is connected to a control signal input interface of the audio channel switching circuit module, an audio signal output interface of the digital signal broadcasting module is connected to a set of audio signal input interfaces of the audio channel switching circuit module, an audio signal output interface of the bluetooth module is connected to another set of audio signal input interfaces of the audio channel switching circuit module, and an audio signal input interface of the playing module is connected to an audio signal output interface of the audio channel switching circuit module, the power module is used for supplying power.

In this embodiment, the power module includes a USB interface, a power chip U4, a battery, and a voltage-reducing chip U6, a power output port of the USB interface is connected to a power output pin of the power chip U4, a battery power pin of the power chip U4 is connected to the battery through a battery power interface, a battery power pin of the power chip U4 is connected to a power input pin of the voltage-reducing chip U6, and a power output pin of the voltage-reducing chip U6 outputs 3.3V power. Through the above, for supplying power.

In this embodiment, the power module supplies power by using 5V of the USB interface. The power output port of the USB interface is connected with a current-limiting resistor R15, the current-limiting resistor R15 is grounded through a resistor R36 and a resistor R35 which are connected in series, the common end of the resistor R36 and the resistor R35 which are connected in series is connected with the base electrode of a triode Q6 through a resistor R411, the collector electrode of the triode Q6 is connected with one of general I/O pins (IR/MFIO _0) of the digital signal broadcasting chip through the current-limiting resistor R30, and the emitter electrode of a triode Q6 is grounded. The current limiting resistor R15 is connected with the filter capacitor C8 and the filter capacitor C19 which are connected in parallel, and the filter capacitor C8 and the filter capacitor C19 are grounded. Through the above, the digital signal broadcasting chip can detect that the USB interface is plugged for charging.

In this embodiment, the charging current adjusting pin of the power chip U4 is grounded through the resistor R20, and the GND pin of the power chip U4 is grounded. Through the above, the charging current is adjusted.

In this embodiment, a battery temperature monitoring pin (TEMP) of the power chip U4 is connected to the NTC, a common terminal of the series-connected voltage divider resistor R44 and voltage divider resistor R34 is connected to a battery temperature monitoring pin (TEMP) of the power chip U4, the voltage divider resistor R44 is connected to a power output terminal of the USB interface, the voltage divider resistor R34 is grounded, a common terminal of the series-connected voltage divider resistor R44 and voltage divider resistor R34 is connected to one of pins of the thermistor J2, and another pin of the thermistor J2 is connected to a battery power supply terminal of the battery. Through the above, the temperature monitoring device is used for monitoring the temperature of the battery.

In this embodiment, a battery power pin (BAT) of the power chip U4 is connected to a battery power terminal of the battery, and is used for charging the battery.

In this embodiment, the detection and feedback pin (STDBY) of the power chip U4 is connected to the cathode of the led D15, and the anode of the led D15 is connected to the power output terminal of the USB interface through the resistor R13. With the above, when the detection and feedback pin (STDBY pin) is fully charged, the voltage level will be pulled low, and the led D15 will be lit.

In this embodiment, the detection and feedback pin (CHRG pin) of the power chip U4 is connected to the cathode of the led D16, and the anode of the led D16 is connected to the power output terminal of the USB interface through the resistor R4. The detection and feedback pin (CHRG pin) is connected with a resistor R18 of a P _ ON network through a resistor R1, the common end of a voltage division resistor R18 and a voltage division resistor R24 which are connected in series is connected with the base electrode of a triode Q1, a voltage division resistor R24 is grounded, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with a 3.3V power supply through a resistor R42, and the collector electrode of a triode Q1 is connected with a general I/O pin (MFIO _15 pin) of the digital signal broadcasting chip through a resistor R109. Through the above, when the potential of the detection and feedback pin (CHRG pin) is pulled low in the charging process, the light emitting diode D16 is ON, and when the battery voltage reaches 4.2V, the detection and feedback pin (CHRG pin) outputs a high level, the light emitting diode D16 is turned off, and the current is limited to the P _ ON pin network through the R1 resistor and then reaches the digital signal broadcasting chip to detect that the battery is fully charged.

In this embodiment, a battery power source terminal (VBAT) is connected to a source of a MOS transistor, a drain of the MOS transistor outputs a power signal (VCC) through a filter capacitor C401, a filter capacitor C402, a filter capacitor C403, a filter capacitor C404, a filter capacitor C405, and a filter capacitor C406 connected in parallel, a gate of the MOS transistor is connected to a common terminal of a divider resistor R405 and a divider resistor R406 connected in series, the divider resistor R405 is connected to the battery power source terminal (VBAT), the divider resistor R406 is connected to a collector of a transistor Q4, an emitter of the transistor Q4 is grounded, a base of the transistor Q4 is connected to a common terminal of a divider resistor R407 and a divider resistor R422 connected in series, the divider resistor R407 is connected to a cathode of a diode D4, the divider resistor R407 is connected to a cathode of the diode D405, the divider resistor R407 is connected to a cathode of the diode D404, an anode of the diode D4 is connected to a power output terminal (VBUS) of the USB interface, the anode of the diode D405 is connected with a TIG _ ON port of the key module, the anode of the diode D404 is connected with the resistor R421 through the capacitor C34 connected in parallel, one end of the common end of the capacitor C34 and the resistor R421 connected in parallel is connected with one of the general I/O pins (MFIO _7) of the digital signal broadcasting chip through the resistor R420, and the other end of the common end of the capacitor C34 and the resistor R421 connected in parallel is grounded. The power supply output signal (VCC) is output to one of the analog/digital conversion pins (ADC2) of the digital signal broadcasting chip through the resistor R408 and the capacitor C429 and the resistor R409 connected in parallel. Through the above, the method is used for controlling and outputting the stable power supply signal.

In this embodiment, the audio channel switching circuit module adopts an audio channel switching chip IC201, one of the general I/O pins (MFIO _10) of the digital signal broadcasting module is connected to a clock pin (CLK) of the audio channel switching chip IC201 through an inductor L107 and a resistor R216 connected in series, the inductor L107 is connected to the MFIO _10 pin, the resistor R216 is grounded through a capacitor C45, one of the general I/O pins (MFIO _9) of the digital signal broadcasting module is connected to a DATA pin (DATA) of the audio channel switching chip IC201 through an inductor L111 and a resistor R215 connected in series, the inductor L111 is connected to the MFIO _9 pin, and the resistor R215 is grounded through a capacitor C53. The power output signal (VCC) is connected to the power input pin (VDD) of the audio channel switching chip IC201 through the inductor L201 and the filter capacitor C224, the filter capacitor C225, the filter capacitor C226, and the filter capacitor C30 connected in parallel. The right channel input pin (R _ IN) of the audio channel switching chip IC201 after audio processing is connected to the right channel gain selection output pin (R _ OUT) of the audio channel switching chip IC201 through the coupling capacitor C209. The left channel input pin (TREB _ L) of the treble control circuit of the audio channel switching chip IC201 is grounded through a capacitor C212. The right channel input pin (TREB _ R) of the treble control circuit of the audio channel switching chip IC201 is grounded through a capacitor C211. The right channel high loudness input pin (LOUD _ R) of the audio channel switching chip IC201 is grounded through a capacitor C213. The left channel high loudness input pin (LOUD _ L) of the audio channel switching chip IC201 is grounded through a capacitor C214. One of the right channel input pins (R _ IN4) of the audio channel switching chip IC201 is connected with the right audio output pin (AUD _ R pin) of the digital signal broadcasting chip through a capacitor C201, a resistor R131, a capacitor C131 and an inductor L131 which are connected IN series, the common end of the capacitor C201 and the resistor R201 is grounded through a resistor R203 and a capacitor C203 which are connected IN parallel, and the common end of the resistor R201 and the resistor R131 is grounded through a capacitor C133. One of the left channel input pins (L _ IN4) of the audio channel switching chip IC201 is connected to the left audio output pin (AUD _ L) of the digital signal broadcasting chip through a capacitor C202, a resistor R132, a capacitor C132, and an inductor L132 connected IN series, a common terminal of the capacitor C202 and the resistor R202 is grounded through a resistor R204 and a capacitor C204 connected IN parallel, and a common terminal of the resistor R202 and the resistor R132 is grounded through a capacitor C134. Through the above, the audio channel switching chip IC201 stably receives the digital signal broadcast chip, converts the digital signal broadcast chip into the intermediate frequency analog signal through the high frequency module, performs a/D conversion after amplification to obtain the digital signal, performs source decoding processing, and then restores the D/a to the audio signal output by the analog audio.

IN this embodiment, one of the right channel input pins (R _ IN3 pin) of the audio channel switching chip IC201 is connected to the d/a conversion right channel pin (DACR pin) of the bluetooth chip U1 through a capacitor C56 and a resistor R57 connected IN series, and a common terminal of the capacitor C56 and the resistor R57 is grounded through a resistor R68 and a capacitor C55 connected IN parallel. One of the left channel input pins (L _ IN3) of the audio channel switching chip IC201 is connected to the d/a conversion left channel pin (DACL) of the bluetooth chip U1 through a capacitor C57 and a resistor R70 connected IN series, and a common terminal of the capacitor C57 and the resistor R70 is grounded through a resistor R72 and a capacitor C59 connected IN parallel. Through the above, the audio channel switching chip IC201 stably receives the audio signal of the bluetooth chip.

IN this embodiment, the left channel output pin (OUT _ L) of the audio channel switching chip IC201 is connected to the audio input pin (IN +) of the power amplifier chip U2 through the series connection of the capacitor C220 and the resistor R212 and the series connection of the resistor R48, the resistor R3, the capacitor C58 and the resistor 49, the right channel output pin (OUT _ R) of the audio channel switching chip IC201 is connected to the audio input pin (IN +) of the power amplifier chip U2 through the series connection of the capacitor C219 and the resistor R211 and the series connection of the resistor R52, the resistor R3, the capacitor C58 and the resistor 49, the positive phase audio output pin (OUT +) of the power amplifier chip is connected to the interface CON2 of the speaker through the inductor L1, the inductor L1 is connected to the filter capacitor C11, the filter capacitor C11 is grounded, the negative phase audio output pin (OUT-) of the power amplifier chip is connected to the interface CON2 of the speaker through the inductor L2, and the filter capacitor C62 is connected to the inductor L2, the filter capacitor C62 is grounded. The battery power interface (VBAT) is connected with a switch-on and switch-off all-on pin (CTRL) of the power amplifier chip U2 through a resistor R31 and a resistor R58 which are connected in series. One universal I/O pin (MFIO _11) of the digital signal broadcasting chip is connected with the anode of a diode D2, the cathode of a diode D2 is connected with the base of a triode Q2 through a resistor R63, a battery power interface (VBAT) is connected with the collector of a triode Q2 through a resistor R31, the emitter of a triode Q2 is grounded, the common end of the resistor R63 and the base of the triode Q2 is connected with a capacitor C46 and a resistor R26 which are connected in parallel, and the capacitor C46 and the resistor R26 are connected in parallel and grounded. The reference voltage external capacitor pin (BYPASS pin) of the power amplifier chip U2 is grounded through a capacitor C61. The MODE selection pin (MODE pin) of the power amplifier chip U2 is grounded through a resistor R10. The battery power interface (VBAT) is connected with a power input pin (VCC) of the power amplifier chip U2, and the battery power interface (VBAT) and the power input pin (VCC) are connected with a filter capacitor C51, a filter capacitor C50 and a filter capacitor C49 which are connected in parallel. The filter capacitor C51, the filter capacitor C50 and the filter capacitor C49 which are connected in parallel are grounded. The GND pin of the power amplifier chip U2 is grounded. Through the method, the power amplifier module works normally, and the loudspeaker plays sound.

In this embodiment, one of the general I/O pins (MFIO _11) of the digital signal broadcasting chip is connected to the enable pin (EN pin) of the ear amplifier chip U3 through the resistor R160 and the resistor R6 connected in series, the common terminal of the resistor R63 and the base of the transistor Q2 is connected to the interface COM of the earphone J1 of the ear amplifier module, one of the general I/O pins (MFIO _11) of the digital signal broadcasting chip is connected to the collector of the transistor Q8 through the resistor R160, the common terminal of the resistor R150 and the resistor R43 connected in series is connected to the base of the transistor Q8, the resistor R43 is grounded, the resistor R150 is connected to the common terminal of the resistor R63 and the base of the transistor Q2, and the emitter of the transistor Q8 is grounded. A resistor R7 is connected between an enable pin (EN) of the ear amplifier chip U3 and a resistor R6, the resistor R7 is grounded, a left audio inverting input pin (INL-) of the ear amplifier chip U3 is grounded through a capacitor C6 and a resistor R23 which are connected in series, a right audio inverting input pin (INR-) of the ear amplifier chip U3 is grounded through a capacitor C9 and a resistor R29 which are connected in series, a power supply input port (VCC) is connected with a power supply Pin (PVDD) of the ear amplifier chip U3 through the resistor R8, a filter capacitor C14, a filter capacitor C15 and a filter capacitor C52 which are connected in parallel are connected between the power supply input port and the power supply Pin (PVDD) of the ear amplifier chip U3, and a filter capacitor C14, a filter capacitor C15 and a filter capacitor C52 which are connected in parallel are grounded. The positive power supply pin (HPVDD) of a charge pump of an ear amplifier chip U3 is grounded through a capacitor C13, the negative power supply pin (HPVSS) of the charge pump of an ear amplifier chip U3 is grounded through a capacitor C10, the signal ground pin (SGND) of an ear amplifier chip U3 is grounded, the ground pin (PGND pin) of an ear amplifier chip U3 is grounded, the GND pin of an ear amplifier chip U3 is grounded, the common end of a resistor R37 and a resistor R41 which are connected in series is connected with the gain setting pin (G1) of an ear amplifier chip U3, a resistor R37 is connected with the power supply Pin (PVDD) of an ear amplifier chip U3, a resistor R41 is grounded, the common end of a resistor R45 and a resistor R46 which are connected in series is connected with the gain setting pin (G0) of an ear amplifier chip U3, a resistor R45 is connected with the power supply Pin (PVDD) of an ear amplifier chip U3, a resistor R5732 is grounded, and the charge pump pin (HPVDD) of an ear amplifier chip U3 is connected with the negative terminal of an ear pump chip CAP (CAP) through a capacitor C8653). The right audio output pin (OUTR) of the ear amplifier chip U3 is connected with the right channel interface (R) of the earphone J1 through an inductor L7, the common end of the inductor L7 and the right channel interface (R) of the earphone J1 is connected with a capacitor C39 and a resistor R47 which are connected in series, the resistor R47 is grounded, the left audio output pin (OUTL pin) of the ear amplifier chip U3 is connected with the left channel interface (L) of the earphone J1 through an inductor L8, the common end of the inductor L8 and the left channel interface (L) of the earphone J1 is connected with a capacitor C40 and a resistor R50 which are connected in series, and the resistor R50 is grounded. Through the above, the ear playing module works normally, and sound playing by the ear is realized.

In this embodiment, a power output pin (VOUT) of the boost chip U7 is connected to a filter capacitor C43, a filter capacitor C35, a filter capacitor C36 and a filter capacitor C44 which are connected in parallel, a filter capacitor C43, a filter capacitor C35, a filter capacitor C36 and a filter capacitor C44 which are connected in parallel are grounded, a GND pin of the boost chip U7 is grounded, an enable pin (EN) of the boost chip U7 is connected to a general I/O pin (MFIO _7 pin) of the digital signal broadcasting chip through a resistor RC1, a capacitor C38 and a resistor RC2 which are connected in parallel are connected to a common terminal of the enable pin (EN pin) of the boost chip U7 and the resistor RC1, and a capacitor C38 and a resistor RC2 which are connected in parallel are grounded. The power supply input interface (VCC) is connected with a power supply input pin (VIN) of the boost chip U7, the power supply input pin (VIN) of the boost chip U7 is connected with a filter capacitor C42, the filter capacitor C42 is grounded, and a C + pin of the boost chip U7 is connected with a C-pin of the boost chip U7 through a coupling capacitor C41. The power output pin (VOUT) of the boost chip U7 is connected with the power input pin (VBAT) of the Bluetooth chip U1, the common end of the power output pin (VOUT) of the boost chip U7 and the power input pin (VBAT) of the Bluetooth chip U1 is connected with the filter capacitor C28, and the capacitor C28 is grounded. Through the above, 5V voltage power supply is provided for the Bluetooth chip.

In this embodiment, the crystal oscillation input pin (BT _ OSCI) of the bluetooth chip IC201 is connected to the crystal oscillation output pin (BT _ OSCO) of the bluetooth chip IC201 through the crystal oscillator Y1. An antenna radio frequency pin (BT _ RF) of the Bluetooth chip is connected with an antenna BT _ ANT1 through a capacitor C16, a capacitor C3 is connected to the common end of the capacitor C16 and the antenna BT _ ANT1, and a capacitor C3 is grounded. The antenna power supply output pin (BT _ AVDD) of the bluetooth chip is grounded through a capacitor C25. Through the above, the Bluetooth chip can work normally.

In this embodiment, the general I/O pin (MFIO _12) of the digital signal broadcasting chip is connected to the volume control pin (PC3) of the bluetooth chip U1 through the resistor R112, the general I/O pin (MFIO _15) of the digital signal broadcasting chip is connected to the volume control pin (PC5) of the bluetooth chip U1 through the resistor R67, the general I/O pin (MFIO _6) of the digital signal broadcasting chip is connected to the play control pin (PC4) of the bluetooth chip U1 through the resistor R113, the DM pin of the digital signal broadcasting chip is connected to the USBDM pin of the bluetooth chip U1 through the resistor R61, and the DP pin of the digital signal broadcasting chip is connected to the USBDP pin of the bluetooth chip U1 through the resistor R53. Through the above, the volume and the playing of the Bluetooth can be controlled.

In this embodiment, a 3.3V power output pin (DACVDD) of the bluetooth chip U1 is connected to the positive electrode of the microphone MIC1 through a resistor RC20, a capacitor C22 is connected between the positive electrode of the microphone MIC1 and the negative electrode of the microphone MIC1, and the negative electrode of the microphone MIC1 is grounded. A3.3V power supply output pin (DACVDD) of the Bluetooth chip U1 is connected with a filter capacitor C27, the filter capacitor C27 is grounded, a common mode signal interference elimination pin (VCOM) of the Bluetooth chip U1 is grounded through a capacitor C26, and a 3.3V voltage output pin (VDDIO) of the Bluetooth chip U1 is grounded through a capacitor C32. The audio ground power supply output pin (DACVSS) of bluetooth chip U1 is connected to ground. Through the above, the microphone is enabled to work normally.

IN this embodiment, a 3.3V power supply is connected to a power input pin (VCC) of the operational amplifier chip IC102, the power input pin (VCC) of the operational amplifier chip IC102 is connected to a filter capacitor C140 and a filter capacitor C141 which are connected IN parallel, the filter capacitor C140 and the filter capacitor C141 which are connected IN parallel are grounded, a general I/O pin (MFIO _1) of the digital signal broadcasting chip is connected to a non-inverting input pin (+ IN1) of the operational amplifier chip IC102 through a resistor R110 and a resistor R114 which are connected IN series, one end of the resistor R114 is connected to the capacitor C138, the capacitor C138 is grounded, the other end of the resistor R114 is connected to the capacitor C139, the capacitor C139 is grounded, a common end of the non-inverting input pin (+ IN1) and the capacitor C139 of the operational amplifier chip IC102 is connected to a resistor R115. An output pin (OUT1) of the operational amplifier chip IC102 is connected with a base electrode of a triode Q5 through a resistor R116, a collector electrode of the triode Q5 is connected with one end of an LED backlight port, the other end of the LED backlight port is connected with a 3.3V power supply through an inductor L113, an emitter electrode of the triode Q5 is grounded through a resistor R118, and an inverting input pin (-IN1) of the operational amplifier chip IC102 is grounded through a resistor R118. Through the above, the LED backlight is controlled.

In this embodiment, the 3.3V power supply is connected to the power input pin (VIN) of the LCD panel 2X16 through the inductor L206. The 3.3V power supply is connected to the positive power supply pin (VDD) of the LCD panel 2X16 through the inductor L206. The inductor L206 is connected to the common terminal of the positive power supply pin (VDD) by a filter capacitor C229 and a filter capacitor C228 connected in parallel. The power output terminal (VOUT) of the LCD panel 2X16 is grounded via a capacitor C257, and a filter capacitor C229 and a filter capacitor C228 connected in parallel are connected to a common terminal of the inductor L206 and the power input terminal (VIN). The filter capacitors C229 and C228 connected in parallel are grounded. The power output pin (VOUT) of the LCD panel 2X16 is grounded via a capacitor C257, the CAPIN pin of the LCD panel 2X16 is connected to the CAPIP pin of the LCD panel 2X16 via a coupling capacitor C249, and the NC pin of the LCD panel 2X16 is floating. The general I/O pin (MFIO _10) of the digital signal broadcasting chip is connected to the DB6 pin of the LCD panel 2X16 through an inductor L107, and the general I/O pin (MFIO _9) of the digital signal broadcasting chip is connected to the DB7 pin of the LCD panel 2X16 through an inductor L111. Through the method, the LCD display screen is controlled to display.

In this embodiment, the digital signal broadcasting chip is connected to a key module, one of the analog/digital conversion pins of the digital signal broadcasting chip is connected to one of the output terminals of the key module, the other analog/digital conversion pin of the digital signal broadcasting chip is connected to the other output terminal of the key module, the first output terminal of the key module is connected to the 1.8V power terminal of the voltage-dropping chip U6 through a pull-up resistor R32, the second output port of the key module is connected to the 1.8V power terminal of the voltage-dropping chip U6 through a pull-up resistor R126, the first output terminal of the key module is connected to one of the switch pins of the switch chip U2 through a resistor R936, a resistor R937, a resistor R938, a resistor R22, a resistor R19, a resistor R27, and a resistor R55 connected in series, a common terminal between the resistor R936 and the resistor R937 is grounded through a key S8, a common terminal between the resistor R937 and the resistor R938 is grounded through a key S9, the common terminal between the resistor R938 and the resistor R22 is grounded through a key S10, the common terminal between the resistor R22 and the resistor R19 is grounded through a key S11, the common terminal between the resistor R19 and the resistor R27 is grounded through a key S2, one of the analog/digital conversion pins of the digital signal broadcasting chip of the key module is connected with the other switch pin of the switch chip U2 through a resistor R929, a resistor R931, a resistor R933, a resistor R934, a resistor R935 and a resistor R25 which are connected in series, the common terminal between the resistor R931 and the resistor R932 is grounded through a key S3, the common terminal between the resistor R932 and the resistor R933 is grounded through a key S4, the common terminal between the resistor R933 and the resistor R934 is grounded through a key S5, the common terminal between the resistor R934 and the resistor R935 is grounded through a key S6, the common terminal between the resistor R929 and the resistor R931 and the emitter of the transistor Q7 are connected with the collector of the transistor Q7, and the collector of the transistor Q7 are grounded, the common end of the divider resistor R909 and the divider resistor R28 is connected with the base of the triode Q7, the divider resistor R28 is grounded, the divider resistor R909 is connected with the anode of the diode D405, the battery power output port of the power module is connected with the battery power port of the key module, the battery power port of the key module is connected with the source of the MOS tube, the drain of the MOS tube is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the resistor R909. Through the above, the digital signal broadcasting module is controlled by the artificial keys, and different functions are generated when different voltages are detected by pressing one key.

In this embodiment, the LCD panel 2X16 is of the LCD12DIP type.

In this embodiment, the model of the bluetooth chip U1 is AC6925A _ QSOP 24.

In this embodiment, the model of the boost chip U7 is XH 4004.

In this embodiment, the model of the buck chip U6 is ME6207C33M 5.

In this embodiment, the type of the audio channel switching chip IC201 is ET 2354.

In this embodiment, the ear pick-up chip U3 has a model number HT 4832.

In this embodiment, the power amplifier chip U2 is of model CS 8571.

Pin function correspond the pin english of its chip, if pin function wherein of other chips on the market or interface is unanimous, but the english difference of its pin that corresponds, this also belongs to the utility model discloses in the protection range.

The above is only the preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and the technical solution of the present invention is all within the protection scope of the present invention as long as the present invention is realized by the substantially same means.

Claims

1. The utility model provides a audio amplifier with digital signal broadcasting and bluetooth function, characterized by: the sound box with the functions of digital signal broadcasting and Bluetooth comprises a power supply module and a digital signal broadcasting module, the Bluetooth module, the audio channel switching circuit module and the playing module, the volume control output interface of the digital signal broadcasting module is connected with the volume control input interface of the Bluetooth module, the control signal output interface of the digital signal broadcasting module is connected with the control signal input interface of the audio channel switching circuit module, the audio signal output interface of the digital signal broadcasting module is connected with one group of audio signal input interfaces of the audio channel switching circuit module, the audio signal output interface of the Bluetooth module is connected with the other group of audio signal input interfaces of the audio channel switching circuit module, the audio signal input interface of the playing module is connected with the audio signal output interface of the audio channel switching circuit module, and the power supply module is used for supplying power.

2. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 1, wherein: the power supply module comprises a USB interface, a power chip U4, a battery and a voltage reduction chip U6, wherein a power output port of the USB interface is connected with a power output pin of the power chip U4, a battery power pin of the power chip U4 is connected with the battery through a battery power interface, a battery power pin of the power chip U4 is connected with a power input pin of the voltage reduction chip U6, and a power output pin of the voltage reduction chip U6 outputs 3.3V power.

3. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 1, wherein: the audio channel switching circuit module adopts an audio channel switching chip IC201, one general I/O pin of the digital signal broadcasting module is connected with a clock pin of the audio channel switching chip IC201, and a second general I/O pin of the digital signal broadcasting module is connected with a data pin of the audio channel switching chip IC 201.

4. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 2, wherein: the Bluetooth module comprises a boosting chip U7 and a Bluetooth chip U1, a power input pin of the boosting chip U7 is connected with an output end of the power module, a power output pin of the boosting chip U7 is connected with a battery power pin of the Bluetooth chip U1, a third general I/O pin of the digital signal broadcasting chip is connected with an enabling pin of the boosting chip U7, a fourth general I/O pin of the digital signal broadcasting chip is connected with a first volume control pin of the Bluetooth chip U1, a fifth general I/O pin of the digital signal broadcasting chip is connected with a second volume control pin of the Bluetooth chip U1, and a sixth general I/O pin of the digital signal broadcasting chip is connected with a volume control pin of the Bluetooth chip U1.

5. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 4, wherein: one of the right channel input pins of the audio channel switching chip IC201 is connected with the common end of a voltage dividing resistor R203 and a voltage dividing resistor R201 through a capacitor C201, the voltage dividing resistor R203 is grounded, the voltage dividing resistor R201 is connected with the right audio output pin of the digital broadcasting chip, the pin of the right channel input after audio processing of the audio channel switching chip IC201 is connected with the right channel gain selection output pin of the audio channel switching chip IC201 through a capacitor C209, one of the left channel input pins of the audio channel switching chip IC201 is connected with the common end of a voltage dividing resistor R204 and a voltage dividing resistor R202 through a capacitor C202, the voltage dividing resistor R204 is grounded, the voltage dividing resistor R202 is connected with the left audio output pin of the digital broadcasting chip, one of the right channel input pins of the audio channel switching chip IC201 is connected with the common end of a voltage dividing resistor R68 and a voltage dividing resistor R57 through a capacitor C56, the divider resistor R68 is grounded, the divider resistor R57 is connected with the pin of the D/A conversion right channel of the Bluetooth chip U1, one of the left channel input pins of the audio channel switching chip IC201 is connected with the common end of the divider resistor R72 and the divider resistor R70 through the capacitor C57, the divider resistor R72 is grounded, and the divider resistor R70 is connected with the pin of the D/A conversion left channel of the Bluetooth chip U1.

6. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 2, wherein: the digital signal broadcasting chip is connected with a key module, one analog/digital conversion pin of the digital signal broadcasting chip is connected with one output end of the key module, the other analog/digital conversion pin of the digital signal broadcasting chip is connected with the other output end of the key module, the first output end of the key module is connected with the 1.8V power supply end of the voltage reduction chip U6 through a pull-up resistor R32, the second output port of the key module is connected with the 1.8V power supply end of the voltage reduction chip U6 through a pull-up resistor R126, the first output end of the key module is connected with one switch pin of the switch chip U2 through a resistor R936, a resistor R937, a resistor R938, a resistor R22, a resistor R19, a resistor R27 and a resistor R55 which are connected in series, a common end between the resistor R936 and the resistor R937 is grounded through a key S8, a common end between the resistor R937 and the resistor R938 is grounded through a key S9, the common terminal between the resistor R938 and the resistor R22 is grounded through a key S10, the common terminal between the resistor R22 and the resistor R19 is grounded through a key S11, the common terminal between the resistor R19 and the resistor R27 is grounded through a key S2, one of the analog/digital conversion pins of the digital signal broadcasting chip of the key module is connected with the other switch pin of the switch chip U2 through a resistor R929, a resistor R931, a resistor R933, a resistor R934, a resistor R935 and a resistor R25 which are connected in series, the common terminal between the resistor R931 and the resistor R932 is grounded through a key S3, the common terminal between the resistor R932 and the resistor R933 is grounded through a key S4, the common terminal between the resistor R933 and the resistor R934 is grounded through a key S5, the common terminal between the resistor R934 and the resistor R935 is grounded through a key S6, the common terminal between the resistor R929 and the resistor R931 and the emitter of the transistor Q7 are connected with the collector of the transistor Q7, and the collector of the transistor Q7 are grounded, the common end of the divider resistor R909 and the divider resistor R28 is connected with the base of the triode Q7, the divider resistor R28 is grounded, the divider resistor R909 is connected with the anode of the diode D405, the battery power output port of the power module is connected with the battery power port of the key module, the battery power port of the key module is connected with the source of the MOS tube, the drain of the MOS tube is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the resistor R909.

7. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 5, wherein: the left channel output pin of the audio channel switching chip IC201 is connected to the left audio input interface of the playing module, and the right channel output pin of the audio channel switching chip IC201 is connected to the right audio input interface of the playing module.

8. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 7, wherein: the playing module comprises an ear playing module and a power amplifier module, the ear playing module comprises an ear playing chip U3, a left audio in-phase input pin of an ear playing chip U3 is connected with a left channel output pin of an audio channel switching chip IC201, a right audio in-phase input pin of an ear playing chip U3 is connected with a right channel output pin of the audio channel switching chip IC201, a right audio output pin of an ear playing chip U3 is connected with a right channel interface of an earphone J1, and a left audio output pin of an ear playing chip U3 is connected with a left channel interface of an earphone J1; the power amplifier module comprises an active power amplifier chip U2, an audio input pin of the power amplifier chip U2 is connected with a right channel output pin of the audio channel switching chip IC201, an audio input pin of the power amplifier chip U2 is connected with a left channel output pin of the audio channel switching chip IC201, a positive phase audio output pin of the power amplifier chip U2 is connected with an interface CON2 of the loudspeaker, and a negative phase audio output pin of the power amplifier chip U2 is connected with an interface CON2 of the loudspeaker.

9. The speaker box with digital signal broadcasting and bluetooth functions as claimed in claim 2, wherein: the battery power pin of the power chip U4 is connected with the source of a MOS tube, the gate of the MOS tube is connected with the common end of a divider resistor R405 and a divider resistor R406, the divider resistor R405 is connected with the battery power pin of the power chip U4, the divider resistor R406 is connected with the collector of a triode Q4, the drain of the MOS tube is connected with the power output end, the power output end of a USB interface is connected with the anode of a diode D4, the base of the triode Q4 is connected with the divider resistor R407 and the divider resistor R422, the divider resistor R407 is connected with the cathode of a diode D4, the divider resistor R407 is connected with the cathode of the diode D405, the divider resistor R407 is connected with the cathode of the diode D404, the resistor R422 is grounded, the anode of the diode D404 is connected with the divider resistor R420 and the divider resistor R421, the divider resistor R420 is connected with one of the general I/O pins of the digital signal broadcasting module, the voltage dividing resistor R421 is grounded.