KR20050084700A - Digital audio player - Google Patents

Abstract

The present invention provides a digital audio player for receiving and reproducing an external signal, wherein a noise state included in the external signal is detected through a noise removing unit in the external signal recording mode under the control of a controller, and the detected noise is filtered. Therefore, only the source from which the noise is removed is stored in the memory.

Description

Digital audio player {DIGITAL AUDIO PLAYER}

The present invention relates to a digital audio player such as an MP3 player, which detects a noise state in a radio or voice recording mode through a noise removing unit, filters the detected noise, and stores only the source in the memory to maximize the memory capacity. Relates to an audio player.

Moving Picture Experts Group (MPEG) is a group of video and multimedia experts that have been developed by experts in this field under the auspices of international standards bodies such as the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It provides technical criteria such as compressing a signal, transmitting it, and restoring it again.

MP3 stands for MPEG-1 Audio Layer-3, which is one of the audio parts of MPEG technology. By applying MPEG audio compression technology, audio sound information of a CD can be reduced to 1/12.

As such, advances in science and digital audio data processing technology have resulted in portable digital audio players, such as memory means and MP3 players, which enable the accumulation of sound data (ie, audio sound information) in addition to conventional sound storage media such as cassette tapes and the like. Enabled the development of.

1 is an external perspective view of a general MP3 player 100, and FIG. 2 is a functional block diagram of the MP3 player shown in FIG.

1 and 2, the conventional MP3 player 100 includes a key input unit 115, an A / D converter 120, an encoder 125, a controller 130, a memory 135, The decoder 140 includes a decoder 140, a D / A converter 145, an audio output unit 150, a display unit 160, and an earphone jack 170.

Here, sound data (eg, songs, language learning materials, music, etc.) stored in the memory 135 is reproduced through the earphone jack 170 under the control of the controller 130.

In addition, the key input unit 115 may include a play button, a menu button, a pause button, a song selection button, etc., for determining whether a user plays sound data stored in the memory 135, a playback method, a display form of the display unit 160, and the like. It includes. Of course, even if there is a key input of the user may further include a hold (HOLD) switch for the MP3 player 100 does not operate.

In addition, the power supply unit (not shown) is a means for providing power required for the MP3 player 100 to perform a normal operation.

The power supply unit (not shown) may be, for example, a portable power supply such as a rechargeable battery, a battery, or the like, or an adapter connection for allowing driving power to be applied from an external power source.

In addition, the display unit 160 may include recognition information of the memory 135, sound data information being reproduced (for example, a song name, a playing time, sequence number information of the corresponding song, folder information, etc.), an operation state of the MP3 player 100, and the like. Means for displaying. The information displayed through the display unit 160 is determined according to which function the MP3 player 100 includes, and it is necessary to notify the user of the function information that can be operated by the MP3 player 100. All of the information may be displayed through the display unit 160.

In addition, the controller 130 controls the key input unit 115, the display unit 160, and the power supply to output sound data stored in the memory 135 through the earphone jack by a user's manipulation through the key input unit 115. It performs a function of controlling the supply unit (not shown), the encoder 125, the decoder 140, and the like.

In addition, the A / D converter 120 receives an external analog signal such as a CD, a cassette, or voice recording and converts the signal into a digital signal.

In addition, the encoder 125 converts the digital signal converted by the A / D converter 120 into an MP3 file under the control of the controller 130 and stores it in the memory 110.

In addition, the decoder 140 performs a function of reading and decoding the information of the MP3 file stored in the memory 135 to generate audio digital data under the control of the controller 130.

In addition, the D / A converter 145 is a means for converting audio digital data generated by the decoder 140 into an analog signal to generate audio analog data.

In addition, the audio output unit 150 amplifies and waveform-shapes the audio analog data received from the D / A converter 145 and amplifies the audio analog data through the earphone connected to the earphone jack 170. Means to hear sound data.

In addition, although not shown in FIG. 2, the MP3 player 100 may include a communication interface unit and a power supply unit for a user to access an external sound data storage medium such as a computer, a mobile communication terminal, a personal digital assistant (PDA), or the like. It may further include a charging interface unit for charging the charge from an external power source, such as included in the battery, a remote control signal receiving unit for receiving a control signal from the external wired or wireless remote controller to transmit to the controller 130.

As such, the MP3 player has a built-in memory, so that the desired sound data can be reproduced for a long time without deterioration of sound quality even if a conventional sound storage medium is not separately inserted.

In addition, it can receive input from various sound sources (for example, music, language learning materials, songs, etc.), convert the signal into an MP3 file, record (radio / voice recording), and play it.

However, when recording radio or voice, a silent state without a signal source, that is, a noise state is also recorded without filtering so that the memory capacity is allocated to a portion that does not require the memory.

The present invention has been made to solve the above problems, it is possible to maximize the memory capacity by detecting the noise state in the radio or voice recording mode through the noise removal unit, filtering the detected noise to store only the source in the memory It is an object to provide a digital audio player.

In order to achieve the above object, according to an aspect of the present invention, in the digital audio player that receives and reproduces an external signal, the external signal through the noise removal unit in the external signal recording mode under the control of a control unit Sensing an included noise state and filtering the detected noise to store only the source from which the noise is removed in a memory.

The noise removal unit may include a noise detection circuit for detecting noise included in the external signal, and a noise filter for filtering only the noise signal detected by the noise detection circuit and transmitting only the pure source from which the noise is removed to the encoder. It features.

Another preferred embodiment includes a memory; A control unit controlling the selection of the external signal recording mode of the user; An A / D converter converting the external analog signal input by the user's recording mode selection into a digital signal; A noise detector for detecting noise included in the external signal digitally converted by the A / D converter, and a noise filter for filtering a noise signal detected by the noise detector to transmit only a pure source from which the noise is removed A noise removing unit comprising; An encoder which converts only a pure source into an MP3 file and stores it in the memory under control of the controller; A decoder configured to read and decode information of an MP3 file stored in the memory under control of the controller to generate audio digital data; And a D / A converter configured to convert audio digital data generated by the decoder into an analog signal to generate audio analog data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a functional block diagram of an MP3 player according to the present invention.

As shown in FIG. 3, the MP3 player 200 according to the present invention includes a key input unit 215, an A / D converter 220, an encoder 225, a controller 230, a memory 235, and a decoder. 240, a D / A converter 245, an audio output unit 250, and a noise removing unit 270.

Also, the key input unit 215 typically includes various function buttons such as a play button, a menu button, a pause button, a song selection button, and a hold switch.

Here, the user of the MP3 player wants to store an external signal (for example, music, language learning materials, songs, etc.) as an MP3 file in the memory 210 or download it through the Internet through the manipulation of the key input unit 215.

In this case, the A / D conversion unit 220 converts the input analog signal such as FM, voice, etc. into a digital signal.

The noise removing unit 270 removes the noise signal included in the digitally converted external signal and encodes only the pure sound source from which the noise is removed.

In addition, the noise remover 270 filters the noise signal detected by the noise detector 260 and the noise signal detected by the noise detector 260, and removes only the pure sound source signal from which the noise is removed. And a noise filter 265 for transmitting to encoder 225.

That is, the noise removing unit 270 is configured to detect a noise state in a radio signal or voice recording mode by using a conventional chip set or a separate circuit to filter noise and to store only the source from which the noise is removed. It allows you to maximize memory capacity.

In addition, the noise detector 260 may be implemented as a noise sensor, and the noise filter 265 may be a bandpass filter that sets a band of a sound source to be recorded and passes only the band. Can be implemented.

In addition, the encoder 225 converts only an external signal from which noise is removed, that is, a pure sound source signal, by the control of the controller 230 to an MP3 file and stores it in the memory 235.

In addition, the decoder 240 reads and decodes the information of the MP3 file stored in the memory under the control of the controller 230 to generate audio digital data.

In addition, the D / A converter 245 converts the audio digital data generated by the decoder 240 into an analog signal to generate audio analog data.

In addition, the audio output unit 250 amplifies and waveform-shapes the audio analog data received from the D / A converter 245, and amplifies the audio analog data through the earphone connected to the earphone jack 270. To listen to the sound data.

In addition, the controller 230 controls the encoder 225, the memory 235, and the decoder 240 in order to efficiently use the capacity of the memory 210.

In addition, an amplifier may be further included to amplify the weak signal during A / D conversion or D / A conversion of the external signal.

Although the types of sound data that can be played back have been limited to MP3, the same can be applied to various sound data such as WMA (Microsoft Windows Media Audio File), and the like. It is natural that other sound data file types can be reproduced together.

As such, the present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, the digital audio player according to the present invention comprises a function of detecting a noise state in a radio signal or voice recording mode through a noise removing unit by using an existing chip set or a separate circuit, and filtering noise. Only noise-free sources are stored in memory to maximize memory capacity.

1 is an external perspective view of a typical MP3 player.

2 is a functional block diagram of a general MP3 player.

3 is a functional block diagram of an MP3 player according to the present invention.

<Description of Major Symbols in Drawing>

100, 200: MP3 player 115, 215: key input unit

120, 220: A / D converter 125, 225: encoder

130, 230 control unit 135, 235 memory

140, 240: decoders 145, 245: D / A converter

150, 250: audio output unit 260: noise detection unit

265 noise filter 270 noise removing unit

Claims (3)

In a digital audio player that receives an external signal and plays it, The audio control unit detects a noise state included in the external signal through a noise removing unit in the external signal recording mode under control of a controller, and stores only the source from which the noise is removed in the memory by filtering the detected noise. Player. The method of claim 1, The noise removing unit includes a noise detection circuit for detecting noise included in the external signal, and a noise filter for filtering only the noise signal detected by the noise detection circuit and transmitting only the pure source from which the noise is removed to the encoder. Digital audio player. Memory; A control unit controlling the selection of the external signal recording mode of the user; An A / D converter converting the external analog signal input by the user's recording mode selection into a digital signal; A noise detector for detecting noise included in the external signal digitally converted by the A / D converter, and a noise filter for filtering a noise signal detected by the noise detector to transmit only a pure source from which the noise is removed A noise removing unit comprising; An encoder which converts only a pure source into an MP3 file and stores it in the memory under control of the controller; A decoder configured to read and decode information of an MP3 file stored in the memory under control of the controller to generate audio digital data; And a D / A converter configured to convert the audio digital data generated by the decoder into an analog signal to generate audio analog data.