CN2702587Y

CN2702587Y - Portable MP3 player with FM radio function

Info

Publication number: CN2702587Y
Application number: CN 200420044600
Authority: CN
Inventors: 陈建宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-04-07
Filing date: 2004-04-07
Publication date: 2005-05-25
Anticipated expiration: 2014-04-07

Abstract

The utility model relates to a portable MP3 player with an FM radio function. For enabling the MP3 player to have more functions, the MP3 player comprises a microprocessor, a flash memory for storing MP3 data, a USB interface for connecting external devices, and an MP3 decoder, a number / mode switching device, an amplifying circuit and the output interface of an earphone for orderly finishing the functions of MP3 decoding, number / mode switching, audio amplification and audio output but an FM reception module. The output end of the audio signals of the FM reception module is connected with the input end of the amplifying circuit while the control end is connected with the microprocessor via a reception control unit, and the operating state is controlled by the microprocessor. The MP3 player has the functions of MP3 playing and the FM reception. The emitting unit of acoustic frequency, a liquid crystal display, the control unit of sound recording and other parts can also be arranged in the MP3 player of the utility model for further expanding the functions of the MP3 player.

Description

Portable MP 3 player with FM radio

Technical field

The utility model relates to the MP3 player, more particularly, relates to a kind of portable MP 3 player with FM radio.

Background technology

MP3 is a kind of audio compression form, and it can be processed into a first common song compression computer documents about 5M, is convenient to storage, Classification Management etc.Adorn a corresponding broadcast instrument (that commonly used at present is the Winamp that is exported by Nullsoft company) on computers, just can play mp3 file, restore music signal.Because the development of flash memory (Flash Memory) technology, its volume can be done very for a short time, and capacity is then increasing.Flash memory and MP3 broadcast instrument are combined, just made present popular portable MP 3 player, its volume very little (for example its length and width, thick be 6cm * 3cm * 1cm), but memory capacity can be stored tens first songs generally between 100-300M.

Existing MP3 player has advantages such as volume is little, capacity is big, file process is convenient, music sources is many, but its function is still more single, can only play mp3 file, can not receive the FM radio signal.

The utility model content

At the above-mentioned defective of prior art, existing MP3 player to be solved in the utility model does not have the problem of FM radio, makes the MP3 player have more function.

The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of portable MP 3 player with FM radio, comprise the microprocessor of finishing master control function, the flash memory that is used for store M P3 data, be used for the USB interface that is connected with external equipment, and be used for finishing successively MP3 decoding, D/A switch, audio frequency amplifies and MP3 decoding device, D/A, amplifying circuit and the headset output interface of audio output function; Wherein, also comprise the FM radio module, the audio signal output end of described FM radio module is connected with the input of described amplifying circuit, and its control end then is connected with described microprocessor by the radio reception control unit, and its operating state is controlled by described microprocessor.

In the novel MP3 player of this reality, comprise also with the output of described D/A being connected, being used for audio frequency transmitter unit that described audio frequency transmitter unit is by the outside audio signals of frequency range of FM receiver to outside audio signals.

In the novel MP3 player of this reality, also comprise the LCD of the operating state that is used to show the MP3 player, described LCD is connected with described microprocessor by display driver circuit.

In the novel MP3 player of this reality, also comprise the recording control unit that is connected with described microprocessor, have microphone interface in the described recording control unit, can record to the audio signal of external microphone input.

MP3 player of the present utility model goes out except having the MP3 playing function, also has FM radio, and wherein FM radio module and MP3 play partial common amplifying circuit and headset output interface, and be less to the influence of machine volume; Its audio frequency transmitter unit also can send audio signal to external equipment simultaneously, makes external equipment can share its music sources.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the theory diagram of the utility model MP3 player;

Fig. 2 is the circuit diagram of the main part of band microprocessor in the preferred embodiment of the present utility model;

Fig. 3 is frequency modulation, power amplifier and the flash memory circuit diagram partly that cooperates with Fig. 2;

Fig. 4 is the LCDs that cooperates with Fig. 2,3 and the circuit diagram of part backlight.

Embodiment

The principle of the utility model MP3 player as shown in Figure 1, the essential part of this MP3 player comprises:

Finish the microprocessor of master control function,

The flash memory that is used for store M P3 data, it is connected with microprocessor by the flash memory control unit,

Be used for the USB interface that is connected with external equipment (for example USB interface of computer), it is connected with microprocessor by the USB control unit,

Be used for finishing successively MP3 decoding device, D/A, amplifying circuit and the headset output interface of MP3 decoding, D/A switch, audio frequency amplification and audio output function;

Except above-mentioned essential part, also comprise a FM radio module in this MP3 player, its audio signal output end is connected with the input of amplifying circuit, and its control end then is connected with microprocessor by the radio reception control unit, and the operating state of FM radio module is controlled by described microprocessor.

As can be seen from Figure 1, also be provided with the audio frequency transmitter unit in this MP3 player, its input is connected with the output of D/A, and the audio signal that D/A can be imported is outwards launched by the frequency range of FM receiver.For example can transmit to vehicle-mounted FM receiver by the audio frequency transmitter unit, can broadcast corresponding music this moment by vehicle-mounted FM receiver and power amplifier thereof, speaker system, and the user needn't wear earphone.The user music in the MP3 player can be played back by family expenses, the FM receiver vehicle-mounted or office space for this function, save the trouble of wearing earphone, and the music of being broadcasted can be heard by on the scene everyone, rather than the people who only wears earphone just can hear.

As can be seen from Figure 1, also be provided with the LCD of the operating state that is used to show the MP3 player in this MP3 player, it is connected with microprocessor by the LCD drive circuit.

As can be seen from Figure 1, also be provided with the recording control unit that is connected with microprocessor in this MP3 player, have microphone interface in this recording control unit, can record the audio signal of external microphone input.

The circuit of a preferred embodiment of the present utility model such as Fig. 2, Fig. 3 and shown in Figure 4.

What as can be seen from Figure 2, the microprocessor U2 in the present embodiment adopted is little process chip of model AF3367; The U4 of its underpart is EEPROM, employing be the AT24C128 chip.The left side of U4 is the circuit of recording control unit, and voice signal is by microphone MC1 input, and through the 122nd pin of ADIN1 input microprocessor.The upper left side of Fig. 2 is a power circuit, and its underpart is a USB interface.

What be positioned at Fig. 3 lower right-most portion is power amplifier, and what wherein adopt is that model is the chip of WM8711R, and signal is by L-CH, the R-CH input in its left side, after processing and amplifying, by the headset output interface J1 output on right side.What be positioned at Fig. 3 left side is the FM radio module.What be positioned at Fig. 3 upper right side is to go up flash memory module, and what wherein adopt is that model is the chip of K9K1G08.

The upper right portion that is positioned at Fig. 4 is a LCD circuit, and its underpart then is the backlight liquid crystal display drive circuit.Fig. 4 left side be the mains switch that is used to control this MP3 player, control switch etc.

Claims

1, a kind of portable MP 3 player with FM radio, comprise the microprocessor of finishing master control function, the flash memory that is used for store M P3 data, be used for the USB interface that is connected with external equipment, and be used for finishing successively MP3 decoding, D/A switch, audio frequency amplifies and MP3 decoding device, D/A, amplifying circuit and the headset output interface of audio output function;

It is characterized in that, also comprise the FM radio module, the audio signal output end of described FM radio module is connected with the input of described amplifying circuit, and its control end then is connected with described microprocessor by the radio reception control unit, and its operating state is controlled by described microprocessor.

2, the portable MP 3 player with FM radio according to claim 1, it is characterized in that, comprise also with the output of described D/A being connected, being used for audio frequency transmitter unit that described audio frequency transmitter unit is by the outside audio signals of frequency range of FM receiver to outside audio signals.

3, the portable MP 3 player with FM radio according to claim 1 and 2, it is characterized in that, also comprise the LCD of the operating state that is used to show the MP3 player, described LCD is connected with described microprocessor by display driver circuit.

4, the portable MP 3 player with FM radio according to claim 1 and 2, it is characterized in that, also comprise the recording control unit that is connected with described microprocessor, have microphone interface in the described recording control unit, can record the audio signal of external microphone input.

5, the portable MP 3 player with FM radio according to claim 3, it is characterized in that, also comprise the recording control unit that is connected with described microprocessor, have microphone interface in the described recording control unit, can record the audio signal of external microphone input.

6, the portable MP 3 player with FM radio according to claim 1 and 2 is characterized in that, described flash memory is connected with described microprocessor by the flash memory control unit; Described USB interface is connected with described microprocessor by the USB control unit.