KR20000051851A - Digital audio recording/playback device and operating method - Google Patents

Abstract

PURPOSE: A digital audio storing/reproducing apparatus and its operating method are provided to improve durability and sound quality by installing a unit for storing and reproducing a digital audio in a cassette tape while maintaining its outer casing as it is. CONSTITUTION: A cassette magnetic head(20) contacts a deck head(7) and input and output an audio signal. A D/A and A/D converter(40) converts an analog audio signal to a digital data and a stored digital audio signal to an analog signal. A compressing and reproducing unit(50) for compresses and reproduces the audio data. A non-volatile memory(100) stores various data such as the audio data and maintains the content even in a no-power state. An operation state recognizing unit(110) recognizes a cassette operation state when a manipulation button is depressed in a cassette deck. A controller(70) manages and controls each part (20,40,60,100,110) so that each of them performs its own function.

Description

Digital audio recording and playback device and its operation method {DIGITAL AUDIO RECORDING / PLAYBACK DEVICE AND OPERATING METHOD}

The present invention relates to a digital audio recording and reproducing apparatus and a method of operating the same, and more particularly, to a digital audio storage reproducing apparatus and a method of operating the same. The present invention relates to a digital audio recording and reproducing apparatus capable of reproducing and carrying a stored audio and a method of operating the same.

General cassette tapes use audio media such as cassette players, car stereos, walkmans, etc. to store or play back audio using analog media, so that the sound quality is degraded.

On the other hand, portable digital audio player that has good sound quality and can be used semi-permanently requires a separate cable to connect to other audio devices, and in particular, a separate device is required for a car stereo device, such as an additional cost.

In addition, conventional portable devices with voice recording have poor sound quality, which makes them unsuitable for storing music and has a small storage capacity, and is expensive for cassette tapes, making it a burden for the general public to purchase and use.

In the various audio storage and playback apparatuses, the present invention discards the disadvantages of each device and combines the advantages, and the mechanical operation is implemented in a cassette shape and the audio is digitally stored and reproduced in a nonvolatile memory. It is about.

The present invention discards the disadvantages of the respective audio storage and playback devices as described above, and the advantages are combined to implement mechanical operation in the shape of a cassette, and digital recording and playback in a general audio device can be performed digitally. It is an object of the present invention to provide a digital audio recording and reproducing apparatus capable of reproducing digitally stored high-quality audio, being portable, as well as storing audio and voice memos, and an operation method thereof.

In order to achieve the above object, the present invention provides a cassette-shaped cassette magnetic head capable of inputting and outputting audio signals in contact with a deck head; A D / A and A / D converter for converting an analog audio signal to be stored to digital and converting the stored digital audio signal to analog; A compression reproducing unit for compressing and reproducing audio data; A nonvolatile memory in which various data such as audio data are stored, but contents are preserved even in a non-powered state; An operation state recognition unit for determining and recognizing a cassette operation state when the operation button is pressed on the cassette deck; A control unit for managing and controlling each of the components to perform a function; It is an object of the present invention to provide a digital audio recording and reproducing apparatus.

In order to achieve the above object, the present invention is a play operation for reproducing the stored digital audio by recognizing the playback mode if the deck head is projected, the rotation direction and the speed of the drive shaft is normal according to the operation of the cassette deck operation; A stop operation for stopping the operation by recognizing the stop mode if the deck head does not protrude and the drive shaft does not rotate; A rewind operation for recognizing the rewind mode when the rotational direction of the drive shaft is opposite to the regeneration mode and the speed is faster than the normal speed; A fast forward operation in which the rotational direction of the drive shaft is the same as the regeneration mode and is faster than the normal speed, so that the rewind mode is fast-forwarded; A pause operation in which the deck head protrudes and the drive shaft does not rotate, and recognizes a stop mode and monitors a change of the cassette deck in a paused state; A recording operation in which a recording tab is present, the erasing head operates, and the deck head protrudes and the drive shaft rotates to the normal mode, thereby recognizing the recording mode and converting analog audio data into digital and storing the compressed data; It is an object of the present invention to provide a method of operating a digital audio recording and reproducing apparatus.

1 is a block diagram of a storage reproducing apparatus according to an embodiment of the present invention;

FIG. 2 is a related detailed diagram of a cassette operating state recognizing unit in FIG. 1; FIG.

3 is a schematic plan view of a storage reproducing apparatus according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: storage player, 3: drive shaft, 5: recording tap, 7: deck head, 10: audio connection, 20; Cassette magnetic head, 30; Microphone, 40: D / A and A / D converters, 50: compressed playback section, 6: display section, 70; Control unit, 80: cassette operation button, 90: remote controller, 100: non-volatile memory, 110: operation state recognition unit, 112: rotation detection unit, 114: deck head protrusion detection unit, 116: erasing head state detection unit, 118: recording Tap detection unit, 120: power control unit, 130: power source, 140: interface, 150: external device.

Hereinafter, the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 3.

1 is a block diagram of a storage reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a related detailed view of a cassette operating state recognizing unit in FIG. 1, and FIG. 3 is a schematic diagram of a storage reproducing apparatus according to an embodiment of the present invention. Top view.

Looking at the basic configuration of the present invention first, in the cassette shape,

A cassette magnetic head 20 in contact with the deck head 7 to input and output audio signals;

A D / A and A / D converter 40 for converting the analog audio signal to be stored to digital and converting the stored digital audio signal to analog;

A compression reproducing unit 50 which compresses and reproduces audio data;

A nonvolatile memory 100 in which various data such as audio data are stored, but contents are preserved even in a non-powered state;

An operation state recognition unit 110 for determining and recognizing a cassette operation state when the operation button is pressed on the cassette deck;

A control unit 70 for managing and controlling each of the components 20, 40, 60. 100 and 110 to perform a function;

It is an object of the present invention to provide a digital audio recording and reproducing apparatus.

Here, the cassette deck is collectively referred to as including all audio equipment capable of attaching a cassette tape and recording and reproducing a general cassette tape such as a cassette player, a car stereo, a walkman, and the like.

Hereinafter, the components of the present invention will be described in more detail. The audio connection unit 10 includes an audio input / output terminal for connecting to an external audio device and a stereo jack for connecting headphones for portable use.

The cassette magnetic head 20 is a head capable of inputting and outputting an audio signal by contacting the deck head 7 when the deck head 7 of the cassette deck protrudes, and the microphone 30 can record external audio and have a built-in type. to be.

The D / A and A / D converters 40 convert analog audio signals to be recorded into digital data and convert the stored digital audio data into analog signals.

The compression and playback unit 50 is a component that compresses and reproduces audio data. Audio compression methods include PCM, ADPCM, G728, G723, MPEG Audio Layer 1, 2, 3, and GSM, which can be selected according to the purpose of use.

The display unit 60 is a component that shows the current state to the user, and the display unit 60 uses small display elements such as LEDs, LCDs, and VFDs.

The cassette operation button 80 is a button installed in the cassette for user operation and includes operation buttons such as play, record, stop, previous, and next.

The remote controller 90 can be operated by wired or wireless for the convenience of the user.

The nonvolatile memory 100 is a component for storing a program, data, and audio data for an apparatus according to the present invention.

The operation state recognition unit 110 is a component that mounts the apparatus according to the present invention to the cassette deck to judge and operate by itself without any additional manipulation in the cassette, that is, the apparatus according to the present invention when the operation button of the cassette deck is pressed. The present operation state is recognized by judging whether the deck head 7 of the cassette deck protrudes, the rotational speed of the drive shaft 3, the state of the erasing head, the state of the recording tab 5, and the like.

The operation state recognition unit 110, the rotation detection unit 112 for detecting the rotational speed and the rotation direction of the drive shaft 3, and the deck head protrusion detection unit 114 for detecting the presence or absence of the protrusion of the deck head (7) And an erase head state detector 116 for detecting an erase head state of the cassette deck, and a recording tap detector 118 for detecting a state of the recording tab 115.

The power supply 130 may be supplied to both an internal power supply and an external power supply. The internal power supply may be a battery type, and the external power supply may be supplied by a method for charging the battery and for a long time use.

The power control unit 120 is required to reduce power consumption and is configured to allow self charging when external power is used.

The interface 140 is a component that allows data exchange by connecting to an external information device 150 such as a PC, and includes a parallel port, a serial port, USB, IEEE1394, IrDA, and the like.

The controller 70 is a component that manages and controls all functions of each component to be performed, and transmits digital audio data stored in the nonvolatile memory 100 to the compression reproducer 50 to reproduce audio. To store the input audio data in the nonvolatile memory 100, to operate according to a user's operation, to display a current state on the display unit 60, and to perform a specified operation according to an operation mode of a cassette. Do it.

Referring to the operation of the component having the above-described configuration, the control unit 70 takes out the audio data stored in the nonvolatile memory 100 and transmits it to the compression reproduction unit 50, which is the D / A and A / D converter 40 The analog signal is converted into an analog signal and supplied to the cassette magnetic head 20 and the audio connection unit 10.

When used as a portable, the audio jack 10 is used as a stereo jack to listen to the audio reproduced by headphones, and when using a cassette deck is a digital audio playback operation to play the audio through the deck head (7).

The digital audio recording operation is converted to digital data by the D / A and A / D converter 40 when the analog audio signal is input through the audio connection unit 10, the cassette magnetic head 20, or the microphone 30, and then compressed and reproduced. Compressed by the unit 50 is stored and stored in the designated nonvolatile memory 100 under the control of the control unit 70.

When the apparatus according to the present invention is mounted and used on a cassette deck, the remote controller 90 can be operated or the operation buttons of the cassette deck can be used, and the operation buttons of the cassette deck are play, stop, and rewind. (rewind), fast forward (record), record (record), pause (pause) and the like, and operates the operation of recognizing the operation state of the cassette deck operation button in the following way.

First, when the deck head 7 protrudes and the rotational direction and speed of the drive shaft 5 are normal, the play mode recognizes the playback mode and plays the stored digital audio. When the play button is pressed on the cassette deck, the deck head 7 It protrudes and comes into contact with the cassette magnetic head 20, and the drive shaft 3 rotates at a normal speed.

The operation state recognition unit 110 detects whether the deck head 7 protrudes and rotates, and the deck head 7 protrudes and the drive shaft 3 rotates at a normal speed. The operation to play.

The stop operation is an operation in which the deck head 7 does not protrude and the drive shaft 3 does not rotate to recognize the stop mode and stop the operation.

The rewind operation includes a recording tab 5, an erasing head operating, and a rotation of the drive shaft 3 in the normal mode while the deck head 7 protrudes. The rewind mode recognizes the rewinding mode and rewinds the previous song. It is divided into the rewind play mode which rewinds and plays back and the random rewind mode which rewinds to an arbitrary position. The recognition of both modes is that the deck head ( If 7) is protruding, it is in rewind regeneration mode. If the deck head 7 is not protruding, it is in random rewind mode.

Since the device according to the present invention uses the digital signal in the random rewind mode, if the rewind occurs for a suitable time, the position is shifted one by one to the previous song, and when the first song is moved, the drive shaft 3 stops and does not rotate. Will be recognized and stopped.

In the rewind playback mode, the deck head 7 protrudes to find the end point of the audio. Therefore, when the audio generated in the rewind playback mode stops for a certain time, it is determined that the cassette deck is rewound to the previous song position. If the user waits until the player enters the play mode, the device according to the present invention performs the play operation.

The fast forward operation is a fast forward mode that recognizes the fast forward mode when the rotational direction of the drive shaft 3 is the same as the regeneration mode and is faster than the normal speed. As shown in the rewind operation, the fast forward motion is performed until the next track. It is divided into fast-forward playback mode for fast forward playback and random fast-forward mode for fast forward to an arbitrary position.

In the fast forward mode, the device according to the present invention uses a digital signal, so if a fast forward occurs for a suitable time, the position is shifted one by one to the next song. It recognizes the mode and stops working.

In the fast-forward play mode, the deck head (7) protrudes to find the end point of the audio. Therefore, when the audio generated in the fast-forward play mode is stopped for a certain time, it is determined that the fast forward to the next song position. If the player enters the play mode after waiting for the play mode, the play operation is performed in the device according to the present invention.

When the deck head 7 protrudes and the drive shaft 3 does not rotate, the pause motion is recognized as the stop mode and the state of the cassette deck is monitored while it is paused. The record motion includes the recording tab 5. When the drive head 3 rotates to the normal mode while the erasing head operates and the deck head 7 protrudes, the cassette magnetic head 20 converts the analog audio data into digital and compresses and stores it in the recording mode. Converts the analog signal into the digital signal from the D / A and A / D converter 40 and compresses it through the compression / regeneration unit 50 and stores it in the nonvolatile memory 100 under the control of the controller 70. to be.

As described above, the present invention maintains the appearance of a cassette tape, which is a conventional analog audio storage medium, but has a configuration for storing and reproducing digital audio in its shape, thereby making it compatible and portable.

In addition, it is possible to download the digital audio compressed to the external device 150 such as a PC through the interface 140 and simply store it in the nonvolatile memory 100.

As described above, the present invention improves durability and sound quality by retaining the appearance of a cassette tape, which is a conventional analog audio storage medium, and storing and reproducing digital audio in its shape, and using a cassette deck or a PC. It is a useful invention that can store and play digital audio in a portable manner and does not have to pay the cost of replacing a conventional analog audio device with a digital audio device.

Claims (5)

In the cassette shape, A cassette magnetic head 20 in contact with the deck head 7 to input and output audio signals; A D / A and A / D converter 40 for converting the analog audio signal to be stored to digital and converting the stored digital audio signal to analog; A compression reproducing unit 50 which compresses and reproduces audio data; A nonvolatile memory 100 in which various data such as audio data are stored, but contents are preserved even in a non-powered state; An operation state recognition unit 110 for determining and recognizing a cassette operation state when the operation button is pressed on the cassette deck; A control unit 70 for managing and controlling each of the components 20, 40, 60. 100 and 110 to perform a function; Digital audio storage playback device characterized in that provided. The digital audio recording and reproducing apparatus according to claim 1, further comprising a cassette operation button (80) installed in the cassette for user operation. The apparatus of claim 1, further comprising a built-in microphone (30) capable of recording audio. Depending on the operation of the cassette deck operation button, A play operation for reproducing the stored digital audio by recognizing it as a playback mode if the deck head 7 protrudes and the rotational direction and speed of the drive shaft 3 are normal; A stop operation in which the deck head 7 does not protrude and the drive shaft 3 does not rotate to recognize a stop mode and stop operation; A rewind operation for recognizing the rewind mode when the rotational direction of the drive shaft 3 is opposite to the regeneration mode and the speed is faster than the normal speed; A fast forward operation for recognizing the fast-winding mode and fast-forwarding if the rotational direction of the drive shaft 3 is the same as the regeneration mode and is faster than the normal speed; A pause operation in which the deck head 7 protrudes and the drive shaft 3 does not rotate and recognizes the stop mode and monitors the state of the cassette deck in a paused state; When the drive shaft 3 rotates to the normal mode with the recording tab 5, the erasing head operating, and the deck head 7 protruding, the recording operation recognizes the recording mode and converts the analog audio data into digital and stores it in compression. of; A method of operating a digital audio recording and reproducing apparatus, characterized in that. 5. The rewind operation according to claim 4, wherein the rewind operation recognizes the rewind playback mode if the deck head 7 protrudes, rewinds and plays back the previous song, and recognizes the random rewind mode if the deck head 7 does not protrude. To rewind to an arbitrary position, In the fast forward operation, if the deck head 7 protrudes, it is recognized as a fast-forward play mode, and it is fast-forwarded and played back to the next song, and if the deck head 7 is not protruded, it is recognized as an arbitrary fast-forward mode. Fast forward to the position, A method of operating a digital audio recording and reproducing apparatus.