KR200204825Y1 - Apparatus for MP3 player adaptor of car audio power amplifier - Google Patents

Abstract

The present invention relates to an MP3 (MP3) adapter, the purpose of the present invention is to deliver the sound signal reproduced and output from the portable MP3 player directly to the vehicle's power amplifier to output sound through the speaker MP3 In providing a playback adapter.

The present invention has a voice signal processing means for amplifying to a predetermined level and impedance matching of the audio signal reproduced and output from the portable MP3 player, and the user selects the voice signal output from the voice signal processing means or the audio signal from the sound source source. The switching unit for switching according to the output to the power amplifier side, and the sound source selection display means for displaying the sound source selection state of the switching unit.

Description

MP3 player adapter of car audio power amplifier {Apparatus for MP3 player adapter of car audio power amplifier}

The present invention relates to an MP3 (MPEG 3 Layer) adapter. More specifically, the portable MP3 player can be connected to a car audio of a vehicle to enable playback of MP3s while driving. The present invention relates to an MP3 playback adapter for a power amplifier of a vehicle that allows sound to be heard.

In general, MP3 is an abbreviation of 'MPEG Player 3', which is a file storage method that can store sound and video data. It is a form of digital music file.

The digital music data of the MP3 method has a large compression ratio and a small file size, and is provided through computer (PC) communication, so that it can be easily downloaded and stored on a small music storage card. As it is possible, it is used widely.

MP3 players are generally made of small portable devices that can be carried in a bag or pocket. If you want to listen to music, you can listen to music stored on the go using headphones or earphones.

Such portable MP3 players must use headphones or earphones when they want to listen to the music being played in the vehicle. Therefore, other people in the vehicle cannot listen to them together, and they also have problems to concentrate on driving and cause an accident. .

Conventionally, in order to solve this problem, an MP3 player is mounted on a car audio of a vehicle, and an insertion unit is formed to insert a semiconductor chip in which audio data is compressed and stored on the front of the car audio. Such a prior art is a utility model registration number '20 -0177691 'registered in 1999, which will be described below with reference to FIG. 1.

1 is a schematic configuration diagram of a vehicular MP3 player according to the prior art, in which a sub-microprocessor 6 receives information compressed from a semiconductor chip 5 inserted through a front insertion portion (not shown) of a car audio case. Read. The sub microprocessor 6 transfers the read data to the decoder 8 under the control of the main microprocessor 7 to restore the compressed music data. The digital / analog converter 9 receives digital music data from the decoder 8 and converts the digital music data into an analog music signal. The equalizer 10 selectively inputs a music signal input from the digital / analog converter 9 or a music signal from an external acoustic device to improve the frequency characteristic of the signal.

The stereo IC 13 outputs the audio signal with the improved frequency characteristics and volume of the signal output from the equalizer 10 as a stereo audio signal. The stereo audio signal output from the stereo IC 13 outputs music through the switch IC 20 that selectively outputs the front stereo, rear stereo and sub bass output stages 14, 15 and 16. Meanwhile, the spectrum analyzer 17 which receives each frequency characteristic of the signal output from the equalizer 10 analyzes it and outputs it as data for displaying as a graph. The main microprocessor 7 controls the sub-microprocessor 6 and the equalizer 10 according to the data from the spectrum analyzer 17 and the user's options input through the key input unit, and simultaneously the LCD display unit 3 ) To express the information according to the operation.

Such a conventional technology restores information of a semiconductor chip in which audio data is compressed and stored, so that sound can be heard through each output terminal as an audio signal.

However, such a prior art can listen to music only when a semiconductor chip that compresses and stores audio data and a device that performs audio signal processing after reading and restoring the audio data must be provided. That is, there was a problem that such a system must be implemented separately in the car audio.

Another conventional technique is in the form of a cassette tape, using a cassette player (Cassette plyer) currently provided in the car audio. That is, to implement a compression storage and restore playback system in the form of MP3 to be inserted into the cassette player.

When the driver wants to listen to the MP3 music, the MP3 player is inserted into the tape insertion hole of the cassette player. At the same time, the cassette player is driven to read music data output from the MP3 player through the cassette player head.

However, the MP3 player according to the related art has the advantage that it can be played anywhere if there is only a cassette player. However, since the MP3 playback sound is transmitted through the head of the cassette player, it is difficult to reproduce the original sound quality of the MP3 player. Also, when you want to listen to the radio or CD, the MP3 player must be removed from the cassette deck and stored separately, and when you want to use it, it is cumbersome to insert it again. In some cases, it may pop out, and in some cases, logic decks that insert and remove cassette tapes electronically may not work. Due to these troublesome problems, the driver could not concentrate on driving, causing a traffic accident.

The present invention is to solve the above-mentioned problems of the prior art, the purpose is to deliver the audio signal reproduced and output from the portable MP3 player and the audio signal of the car audio directly to the power amplifier of the vehicle according to the user's selection The present invention provides an MP3 playback adapter for a power amplifier of a vehicle for outputting sound.

1 is a schematic block diagram of a car audio according to the prior art,

2 is a connection diagram of the MP3 adapter of the car audio according to an embodiment of the present invention,

3 is a block diagram of the MP3 adapter of the car audio according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

200: MP3 player adapter 201: MP3 player cradle

202: audio cable plug 204: power supply terminal

206: audio cable 212: input impedance matching unit

214: buffer 216: output impedance matching unit

218: switching unit 220: display unit

The present invention for achieving the object of the present invention is a voice signal processing means for amplifying to a predetermined level and impedance matching of the audio signal reproduced and output from the portable MP3 player, and a voice signal or sound source source output from the voice signal processing means Switching unit for switching the audio signal from the user's selection to output to the power amplifier side, and sound source selection display means for displaying the sound source selection state of the switching unit.

In a preferred embodiment of the above aspect, the voice signal processing means includes an input impedance matching unit for matching an input impedance of the voice signal output from the portable MP3 player, and a low level audio signal output from the input impedance matching unit to a predetermined level. And an output impedance matching unit for matching the amplification buffer with the output impedance of the audio signal output from the buffer and transmitting the matching impedance to the switching unit.

The present invention made as described above will be described in detail with reference to the accompanying drawings.

2 and 3 are external views and block diagrams of an MP3 playback adapter for a power amplifier of a vehicle according to an embodiment of the present invention. As shown in FIG. 2, FIG. 3 illustrates a portable MP3 player 100 and a portable MP3 adapter 200. And an MP3 player holder 201 for easily mounting the portable MP3 player 100, a car audio 240 including a tuner, a cassette player, and a compact disc (CD) player, and the MP3 player 100. A power amplifier 230 for power amplifying the signal output from the car audio 240 to output the voice through the speaker (SPK), and an audio cable connecting each device, 'RCA' plug and jack.

Here, the portable MP3 adapter 200 includes an input impedance matching unit 212 and an input impedance matching unit 212 for matching an input impedance of a voice signal output from the portable MP3 player 100 as shown in FIG. 3. A buffer 214 for amplifying the low level audio signal output from the audio signal to a predetermined level, an output impedance matching unit 216 for matching an output impedance of the audio signal output from the buffer 214, and the output impedance matching unit ( Switching unit 218 for switching the audio signal output from the 216 or the audio signal output from the car audio 240 to the power amplifier 230 side according to the user's selection and the sound source selection of the switching unit 218 Sound source selection display unit 220 for displaying the status.

Referring to the operation of the present invention configured as described above with reference to Figures 2 and 3 in more detail as follows.

First, the MP3 player holder 201 according to the present invention is installed at a position where the portable MP3 player 100 can be easily operated on an existing vehicle. The audio cable 206 provided in the MP3 player holder 201 is connected to the input / output terminals of the car audio 240 and the power amplifier 230 provided at the front of the vehicle by using a 'RCA' jack.

The power supply of the MP3 playback adapter 200 connects the power terminal 204 to the rear power terminal of the car audio and the chassis ground terminal, thereby receiving ground (Power + 12V) from the car audio.

The portable MP3 player 100 is installed in the connected MP3 player holder 201 and the audio cable plug 202 provided at one side of the MP3 player adapter 200 is inserted into the earphone jack of the portable MP3 player 100. .

As described above, when the portable MP3 player 100 mounted on the vehicle wants to hear the MP3 sound through the speaker SPK provided in the vehicle, first, when the MP3 player is selected as the sound source by operating the switching unit 21, The display unit 220 displays the MP3 sound source selection state.

Subsequently, when the user selects the playback key of the MP3 player, the portable MP3 player 100 restores and reproduces the compressed MP3 voice data and inputs the input impedance matching unit 212 of the MP3 playback adapter 200 to match the impedance. In the buffer 214, the input impedance matching unit 212 amplifies the voice signal level lowered by the impedance matching by a predetermined level. The audio signal amplified by the buffer 214 is matched with the output impedance by the output impedance matching unit 216 and then transmitted to the switching unit 220. Since the switching unit 218 selects the MP3 sound source, the switching unit 218 transmits the voice signal output from the output impedance matching unit 216 to the power amplifier 230.

The voice signal transmitted to the power amplifier 230 is power amplified and the voice is output through the speaker SPK.

If the user wants to listen to a tuner, cassette player or CD player of the car audio 240 as a sound source, the user selects the car audio source by operating a switch provided in the front of the MP3 player holder 201 and listens. When the desired sound source is played back, the reproduced voice signal is output to the power amplifier 230 through the switching unit 218, and the voice is output through the speaker SPK.

As described above, the MP3 playback adapter for a vehicle power amplifier according to the present invention delivers the MP3 sound directly to the power amplifier and outputs it through the speaker, so that it can be listened to with high fidelity and high output HiFi sound. When installed, the MP3 player and car audio can be switched easily with a single switch, which can help drivers to drive safely. On the other hand, the present invention has the effect of listening to high-quality sound by playing a portable MP3 player anywhere using the MP3 playback adapter as well as car car audio, audio or speakers.

Claims (3)

Audio signal processing means (212) (214) (216) for amplifying the audio signal reproduced and output from the portable MP3 player to a predetermined level; A switching unit 218 for switching a voice signal output from the voice signal processing means or a voice signal from a sound source source according to a user's selection and outputting it to the power amplifier And MP3 playback adapter for a vehicle power amplifier, characterized in that the sound source selection display means for displaying the sound source selection state of the switching unit 220. The audio signal processing unit of claim 1, further comprising: an input impedance matching unit (212) for matching an input impedance of the audio signal output from the portable MP3 player; A buffer 214 for amplifying a low level audio signal output from the input impedance matching unit to a predetermined level; And And an output impedance matching unit (216) for matching the output impedance of the audio signal output from the buffer to the switching unit and transmitting the impedance to the switching unit. The MP3 player of claim 1, wherein the connection between the MP3 player and the MP3 player is performed by inserting a plug of an audio cable end connected from the MP3 player into the earphone jack of the MP3 player.