KR100407928B1 - Device and method for automatically recording/playing voice information - Google Patents

Abstract

PURPOSE: A device and a method for automatically recording/playing voice information are provided to play the voice information in anytime while recording contents before a predetermined time. CONSTITUTION: A microcomputer(31) processes/outputs a voice signal of a tuned broadcasting program, records the information for the voice signal in an additional information area, and stops receiving broadcasting when the recorded voice signal is played. A recorder(33) automatically records the voice signal for a predetermined time to a recording medium, and selects/outputs the voice signal recorded in the recording medium by user's playback request. An audio decoder(32) decodes the voice signal output from the recorder as a PCM(Pulse Code Modulation) signal. A DAC(Digital/Analog Converter)(34) converts the PCM signal into an analog signal.

Description

Automatic voice information recording and reproducing apparatus and method

The present invention relates to a decoder for a digital audio signal, and more particularly, to an automatic audio information recording and reproducing apparatus and method for automatically storing and reproducing MPEG audio-compressed digital audio signals being received.

In general, MPEG audio, AC-3, which is widely used as a speech compression algorithm, is adopted not only for a PLAYER but also for a RECEIVER for broadcasting.

Usually, the receiver has the form of video and audio information like the satellite broadcast receiver of each country, ADR (Astra Digital Radio) and DAB (Digital Audio Broadcast) which are professional audio receivers in Europe.

The MPEG audio standard reproduces sound quality of a CD level at a compression rate of about 3.5-5.5 times that of a general PCM signal, and is set at a bit rate of 384 Kbps (192 Kbps per channel) in almost all transmission / reception standards.

The MPEG signal (including a video signal) can be recorded on a digital tape, an optical disk, or the like.

FIG. 1 is a block diagram of a general MPEG audio data. The audio data includes a header area including data such as a sync word, a sampling frequency, a bit rate, and a mode selection, a CRC (Cyclic Redundancy Checking) A scale factor area including a scale factor which is a reference signal of a subband for a re-quantized sample of a subband, and a scale factor area including a scale factor selection information area including selection data of a scale factor, A sub-band sample area, and a sub-information area.

Here, the additional information area is an area that the user can use arbitrarily, and the decoder processes only the subband sample area as audio information.

Therefore, the program creator and the receiver manufacturer make the receiver to use the additional information area when adding necessary functions.

MPEG audio standards include MPEG1, 2, LAYER 1, 2, and 3, but the additional information area is included in all standards.

Hereinafter, a conventional audio decoder will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram showing a configuration of an MPEG audio decoder according to the related art. FIG. 2 is a block diagram showing a configuration of an MPEG audio decoder according to the related art. The MPEG audio decoder includes a microcomputer 21 for controlling an MPEG audio decoder and outputting an audio signal, An audio decoder 22 for outputting a signal and a DAC 23 for converting a PCM signal output from the audio decoder 22 into an analog signal and outputting the analog signal.

The microcomputer 21 of the audio decoder according to the related art controls the initialization and other functions and outputs the MPEG audio signal to the audio decoder 22. [

Then, the MPEG audio signal is decoded by the audio decoder 22 and 16-bit PCM data per sample is output. The DAC 23 converts the PCM signal into an analog signal and outputs it as L (Left), R Output to listeners.

When the listener watches the satellite broadcast, the analog signal outputted to the DAC 23 is recorded when the music or the like is recorded.

In order for the listener to record the currently broadcasted audio, the recording must be performed from the beginning of the music (in the case of music broadcast) and there should be no severe deterioration of the sound quality.

In the conventional MPEG audio decoder configured as described above, a general tape and a player are required to record and reproduce the audio currently being broadcast, which causes deterioration of sound quality.

In addition, it is difficult to operate the recording apparatus when the listener wants to record music or drama when he / she listens to the broadcast, and when the recording apparatus starts to record, the recording must be abandoned unless it is the beginning of the content.

It is an object of the present invention to provide an automatic audio information recording and reproducing apparatus and method for recording contents of a predetermined time before a user can reproduce the audio information at any time, have.

According to an aspect of the present invention, there is provided an automatic audio information storage apparatus including a microcomputer for processing an additional information area to output an audio signal, an audio signal recording unit for recording an audio signal under control of the microcomputer, An audio decoder for processing and outputting audio signals output from the microcomputer and the recording unit; and a converter for converting the signals output from the audio decoder into analog signals and outputting the analog signals.

According to another aspect of the present invention, there is provided a method for storing automatic audio information, comprising the steps of: receiving an audio broadcast and simultaneously recording an audio signal; determining whether the reproduced audio signal is reproducible, And if it is determined that the audio signal can be reproduced, stopping the current audio broadcast and reproducing the recorded audio signal.

Hereinafter, an automatic audio information recording and reproducing apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram showing the structure of an MPEG audio decoder for automatically storing audio information according to the present invention. Referring to FIG. 3, a microcomputer 31 for controlling an entire MPEG audio decoder and processing an additional information area to output an audio signal, An audio decoder 32 for processing the MPEG audio signal A output from the microcomputer 31 and outputting a PCM signal to the microcomputer 31 and a program selection signal B for recording / A recording unit 33 for recording the output MPEG audio signal A 'and outputting the MPEG audio signal C to the audio decoder 32 when the user accesses a specific program or time; And a DAC (Digital-to-Analog Converter) 34 for converting the PCM signal output from the DAC 34 into an analog signal.

Before describing the operation of the MPEG audio decoder according to the present invention, the use of a digital tape or optical disc for recording voice compression information and the additional information area of the structure of MPEG audio data will be described first.

Although it is possible to use ROM for the storage of voice compression information, there is a problem of limit of memory capacity and price increase, and digital tape or optical disk is used as a recording means. In case of image information, information amount (more than 10M bits per second) The recording capacity of the recording medium is difficult to record for a long time and the audio compression information requires 384K bits per second as compared with the video signal. Therefore, it is possible to store encoded audio information of 2-5 hours when using a digital tape or an optical disk .

The digital tape for Digital Audio Tape is originally made to record 16-bit audio PCM information.

The digital tape is easily available for 60 minutes, 90 minutes and 120 minutes. When the MPEG signal is recorded on the tape, information of 60 minutes, 90 minutes, 120 minutes 3.5 minutes or more can be stored.

On the other hand, even when an optical disk is used as a recording medium, MPEG audio signals of about 3 hours can be stored.

When the digital tape and the optical disk are newly recorded, information already recorded is automatically overwritten.

Therefore, recorded contents are automatically removed after a certain period of time and new information is recorded. The structure of the additional information area of the MPEG audio data will be described with reference to FIG. 4. The additional information SYNC area informing the start of the additional information area in the MPEG audio stream and the program having the unique number for each program for the user to access A number area, and a time area having time information for reproducing the time desired by the listener.

Based on the above description, the operation of the MPEG audio decoder according to the present invention will be described with reference to the flow chart of FIG.

When the MPEG audio broadcast is received, the recording unit 33, which is a recording apparatus for a digital tape recorder or an optical disk, is controlled to record the received audio signal (S51) (S52).

The microcomputer 31 displays the number of the program currently being broadcast and the record recording time, which is an elapsed time, on the panel or the OSD (not shown) as a number (S53).

Here, the microcomputer 31 stores the program using the additional information area of the received audio data.

When the program is stored, the audio signal, the corresponding audio broadcasting program number, and the elapsed recording time are stored.

If the listener wants to listen to the program being broadcast and listen to the elapsed program again or selects the play key to confirm whether or not to record, a playback signal is input (S54).

If the listener selects the record key without selecting the play key in the step S54, the current broadcast receiving signal is continuously recorded in the recorder 33. [

After the reproduction signal is input according to the selection of the reproduction key, the listener selects a unique number or time of the program to be heard, and selects the selected number or selects and selects the number displayed in the step S53 (S55 ).

If the currently recorded program exceeds the capacity of the digital tape or optical disc, the oldest sector is overwritten. Therefore, it is determined whether the program selected in step S55 exists in the recording unit 33, that is, ).

The determination of the reproducibility is made by checking the additional information area of the audio information to check whether or not the selected program exists.

If it is determined in step S56 that playback is possible, the receiving and recording of the satellite broadcast is stopped and the corresponding program signal of the tape or disk on which the elapsed program is stored is read from the recording unit 33 and output to the audio decoder 32 (S57).

The audio decoder 32 processes the input signal to output a PCM signal, and the DAC 34 reproduces the PCM signal as an analog signal and outputs the analog signal (S58).

When the desired program is reproduced, the receiver receives the currently broadcasted program and controls the recording unit 33 to record the received audio signal (S59) (S60). As described above, the automatic audio information recording and reproducing apparatus and method of the present invention can record and reproduce a desired program of a program being broadcasted by a simple operation, and can record and store the program without degrading sound quality.

1 is a diagram showing a structure of a general MPEG1 audio data;

FIG. 2 is a block diagram showing a configuration of an MPEG audio decoder according to the related art;

3 is a block diagram showing the structure of an MPEG audio decoder for automatically storing audio information according to the present invention;

FIG. 4 is a view showing the structure of the additional information area according to the present invention; FIG.

FIG. 5 is a flow chart of a method for storing audio information of an MPEG audio decoder according to the present invention;

Description of the Related Art [0002]

31: Micom 32: Audio decoder

33: recording section 34: DAC

Claims (6)

A microcomputer for processing the audio signal of the tuned broadcast program and outputting it for recording and recording information on the audio signal to be recorded at the same time in the additional information area and stopping the broadcast reception at the time of reproducing the recorded audio signal, A recording section for automatically recording the audio signal on a recording medium under the control of the microcomputer for a predetermined time and then selectively outputting a specific audio signal recorded on the recording medium in response to a user's reproduction request; An audio decoder for decoding the audio signal output from the recording unit under the control of the microcomputer and outputting the decoded audio signal as a PCM signal, And a converter for converting the PCM signal output from the audio decoder into an analog signal and outputting the converted analog signal. The recording apparatus according to claim 1, A recording / reproducing conversion signal outputted from the microcomputer, and a voice signal input by a program selection signal by an additional information area, for a predetermined time, Wherein when the user accesses the specific program or time, the audio decoder selects and outputs the audio signal among the audio signals recorded on the recording medium with reference to the additional information area. A first step of tuning a broadcast of a specific channel and automatically recording a voice signal of a tuned broadcast on a recording medium for a predetermined period of time, A second step of determining whether the audio signal is reproducible when a reproduction signal of the audio signal recorded on the recording medium is input; And if it is determined that reproduction is possible, stopping the current broadcast reception and reproducing the recorded voice signal and outputting the voice signal. The method of claim 3, And recording the corresponding program number and recording elapsed time together with the audio signal upon recording the audio signal of the first step. The method of claim 3, Wherein the program number or the recording elapsed time of the audio signal is selectively input when the playback signal of the second step is input. The recording apparatus according to claim 1, And when the audio signal currently recorded exceeds the recording capacity of the recording medium, overwriting is performed from the sector in which the recording is first performed.