CN201134256Y - multifunctional audio player - Google Patents

Abstract

A multifunctional audio player comprises a core function module and an auxiliary module, wherein the core function module comprises a wooden shell, an AM/FM tuner 3, a sound effect controller 5, an audio amplifier 6 and an EEPROM 8, the AM/FM tuner is composed of an MCU 1, an MP3 decoder 2 and a PLL automatic channel searching, and the auxiliary module is composed of an LCD display screen 10 and a capacitance sensor switch controller 11. The MCU 1 connects the MP3 decoder 2, the sound effect controller 5, the tuner 3 and the EEPROM 8 together as a center. The player also comprises a USB interface 13, an SD card slot 12, a loudspeaker 7, a backlight lamp 9 and an AUX sound source input interface 4. The interface and the slot are communicated with the outside through a through hole on the wooden shell. The radio part of the player adopts PLL to search for the channel automatically, which is convenient for users to use. The playing control adopts a button-free capacitive sensor switch controller, and compared with a player with a common button-type control panel, the player has longer service life and higher reliability.

Description

multifunctional audio player

technical field

The utility model relates to an audio player, more specifically, relates to an audio player with multiple functions of PLL automatic station search for AM/FM radio, MP3 playback, alarm clock, and AUX sound source input.

Background technique

The audio players related to in the prior art mainly include AM/FM radios and MP3 players. Most of the existing AM/FM radios do not have the function of automatic station search, and users need to manually tune the stations, which is inconvenient to use; in addition, the memory capacity of existing MP3 players is generally fixed, and some only provide Without the USB interface, the expansion range of the storage function is limited to the USB storage device, so its expansion capability is limited. Moreover, the channel selection, song selection or playback control of existing radios and MP3 players are button-type, and the buttons are easily damaged and cause malfunction, which causes inconvenience to users.

Utility model content

The technical problem to be solved by the present invention is, aiming at the above-mentioned defects of the prior art, provide a kind of AM/FM radio that has (1) PLL automatic station search, (2) can expand storage space through USB interface, SD card slot MP3 player, (3) alarm clock, (4) AUX audio source input, four-in-one functional shell is made of wooden material, multifunctional audio player with capacitive sensor switch controller as control panel.

The technical scheme that the utility model solves its technical problem adopts is, design a kind of multifunctional audio player, comprise wooden casing and by MCU, MP3 decoder, the AM/FM tuner that automatically searches for stations, sound effect controller, The core function module composed of audio amplifier and EEPROM, and the auxiliary module composed of LCD display screen, capacitive sensor switch controller, etc. As a central control unit, MCU connects MP3 decoder, audio controller, tuner and EEPROM together. In addition to storing necessary MP3 data, EEPROM also stores a clock program, and the user can set a certain alarm clock time through the control panel. The LCD display is on the outside of the wooden case. The function keys on the capacitive sensor switch controller correspond to the icons on the LCD, and the icons on the LCD can display the working status of the player.

The AM/FM tuning module of the PLL automatic station search is connected with the MCU and the sound effect controller. The player is also equipped with a USB interface, an SD card slot, a speaker, a backlight, and an AUX audio input interface. The backlight may use LEDs or LED-like elements. The wooden shell is bonded with wooden boards, and matching openings are designed on the shell corresponding to the USB interface and the SD card slot.

This audio player has more functions than existing AM/FM radios and MP3 players. The radio part of the audio player adopts PLL to automatically search channels, which is convenient for users to use. With USB interface and SD card slot, users can easily expand the storage function of the audio player. The playback control panel adopts a buttonless capacitive sensor switch controller, which has a longer service life and higher reliability than the player of the ordinary button control panel. Moreover, in addition to its simple and elegant appearance, its wooden casing also has the advantage of avoiding static electricity due to its wood material, which reduces the damage of static electricity to electronic components and prolongs the service life of the player.

Description of drawings

The utility model will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a block diagram of the utility model multifunctional audio player circuit principle;

Fig. 2 is the schematic diagram of the utility model multifunctional audio player control panel;

Fig. 3 is the main body circuit diagram of the multifunctional audio player of the present invention;

Fig. 4 is the control panel of the utility model multifunctional audio player, the circuit diagram of mainboard;

Fig. 5 is the circuit diagram of the MP3 decoding module part of the multifunctional audio player of the present invention.

Detailed ways

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

As shown in Figure 1 is the block diagram of the circuit principle of the preferred embodiment of the utility model multifunctional audio player. The main functional parts of this player include: a wooden shell and core functions composed of MCU 1, MP3 decoder 2, PLL automatic channel search AM/FM tuner 3, sound effect controller 5, audio amplifier 6, and EEPROM 8 module and an auxiliary module composed of an LCD display screen 10 and a capacitive sensor switch controller 11. MCU 1 plays the role of core control, and MCU 1 as the center connects MP3 decoder 2, audio controller 5, tuner 3, and EEPROM 8 together to directly control the work of each module.

MP3 decoder 2 is used for decoding MP3 data. The sound effect controller 5 with a built-in 2-band equalizer processes the signal from the MCU 1. The PLL automatic station search radio tuner 3 is used for receiving AM/FM broadcast signals, and the output signals are passed to the sound effect controller 5 . The audio signal amplifier 6 performs power amplification on the signals from the tuner 3 and the MP3 decoder 2 . USB interface 13 and SD card slot 12 are used to expand the storage function of the player. Capacitive sensor switch controller 11 is installed on the wooden shell, and is connected with MCU 1 as man-machine interface, and the work of MCU 1 is controlled. In order to enable the user to monitor the playback when the ambient light is not bright enough, a backlight 9 is installed behind the LCD display. There are openings matching the USB interface 13 and the SD card slot 12 on the wooden shell.

As shown in Fig. 2 is a schematic diagram of a control panel of an embodiment of the multifunctional audio player of the present invention. As can be seen from the figure, there are mainly LCD display screen 10 and some function keys on the control panel. Function keys include on/off key 14, function selection key 15, volume control key 16, play key 17, stop play key 18, fast forward key 19, rewind key 20, mono/stereo selection key 21, memory/repeat/random Select key 22, equalizer use key 23. Each icon corresponding to the function key is arranged on the display screen LCD 10, can display the operating state of player, as the frequency of radio tuning, the serial number of the MP3 track of playing, whether it is stereo playback, whether it is random playback etc.

The circuit of a preferred embodiment of the present utility model is shown in Figure 3, 4, 5.

Fig. 3 is the main circuit part of the utility model multifunctional audio player. It can be seen from Figure 3 that what the AM/FM radio module uses is the very small TEA5777HV chip produced by Philips, which can make the total volume of the player smaller and easy for users to carry. The sound effect controller (sound effect controller BD3490FV) with built-in 2-band equalizer performs sound effect processing on the signal from the MP3 decoder, and then sends the signal to the audio power amplifier. The audio power amplifier uses two high-fidelity audio power amplifiers BA5417 to filter and amplify the audio signals of the left and right channels. The lower left corner of Figure 3 is the power supply module, which adopts the power supply mode of 250V AC input, transformer step-down, bridge rectification and filtering, and also provides a 12V external DC power supply mode. After the 12-volt direct current voltage is changed into a stable voltage of 9 volts by a series voltage stabilizing circuit, it is supplied to other modules except the audio power amplifier module.

Fig. 4 is the circuit diagram of the control board and the main board of the multifunctional audio player of the present invention. As shown in the figure, the microprocessor that plays a core role in controlling the player is the EM78P803B chip. The control panel adopts the capacitive sensor switch controller chip BU21008MUV. In the circuit, a microprocessor is used to directly control the LCD with 24 pins, and an LED is used as a backlight.

Fig. 5 is the MP3 decoding module part of the multifunctional audio player of the present invention, as can be seen from the figure, what the core part used is the MP3 decoding chip BU72435, and this chip can be directly connected with the SD card through the slot, and can be used for the SD card. After the MP3 data in the decoding is output to the MCU. The MP3 decoding chip is also connected with the USB interface, so that the chip can decode the MP3 data from the USB storage device. The MP3 decoding chip outputs signals to the sound effect controller BD3490FV in Fig. 3 . Switch SW601 directly controls the playback.

The above-mentioned embodiments are only for the convenience of clearly illustrating the utility model, and are not intended to limit the utility model in any form. Any person with common sense in the technical field shall, without departing from the technical scope of the utility model, The equivalent embodiments of partial changes or modifications made using the technical content disclosed in the utility model do not deviate from the technical features of the utility model, and still belong to the scope of the technical features of the utility model.

Claims (7)

1, a kind of multifunctional audio player, it is characterized in that, comprise wooden shell and by MCU (1), MP3 decoder (2), the AM/FM tuner (3) of PLL automatic platform search, sound effect controller ( 5), the core function module that audio amplifier (6), EEPROM (8) constitute and the auxiliary module that is formed by LCD display screen (10), capacitive sensor switch controller (11), MCU in the described multifunctional audio player (1) Connect with MP3 decoder (2), sound effect controller (5), tuner (3), EEPROM (8) respectively. 2. The multifunctional audio player according to claim 1, characterized in that the capacitive sensor switch controller (11) is provided with the following function keys: switch key (14), function selection key (15), volume Control key (16), play key (17), stop play key (18), fast forward key (19), rewind key (20), mono/stereo selection key (21), memory/repeat/random selection key (22), equalizer use key (23). 3. The multifunctional audio player according to claim 1, characterized in that the AM/FM tuning module (3) of the PLL automatic channel search is connected with the MCU (1) and the sound effect controller (5). 4. The multifunctional audio player according to claim 1, characterized in that, the player also includes a USB interface (13), an SD card slot (12), a loudspeaker (7), a backlight (9), AUX audio input interface (4). 5. The multifunctional audio player according to claim 1, characterized in that, the USB interface (13) and the SD card slot (12) communicate with the outside world through the opening on the wooden casing. 6. The multifunctional audio player according to claim 1, characterized in that the backlight (9) can use LED or LED-like components. 7. The multifunctional audio player according to claim 2, characterized in that, the LCD display (10) is outside the wooden casing, and there are icons corresponding to the function keys on it.

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