KR20000014394U - Digital TVing to record and play back audio signals - Google Patents

Abstract

The present invention converts an analog audio signal input from the outside in a digital TV into a digital moving picture expert group layer-3 (MP3) audio signal and stores it in a memory means, and processes the stored MP3 audio signal by a user's request. The present invention relates to a digital TV capable of recording and reproducing an audio signal that can be reproduced through a process. To this end, the present invention provides a means for converting an input audio signal into a digital audio signal when an analog audio signal is input from an external device, Decoding and outputting the stored digital MP3 audio signal based on means for converting the converted digital audio signal into a digital MP3 audio signal, means for storing the converted MP3 audio signal, and control signals for reproducing the stored digital MP3 audio signal. Means, and decoded digital MP3 audio Means for converting the signal into an analog signal and outputting the same.

Description

Digital TV that can record and play back audio signals

The present invention relates to a digital TV, and more particularly, it is possible to record and reproduce an audio signal suitable for converting and recording an audio signal input from an external to a moving picture expert group layer-3 (MP3) audio signal in a general digital TV. It's about digital TV.

In recent years, there has been a growing interest in digital broadcasting (terrestrial, cable or satellite digital broadcasting), which provides much clearer image and sound quality than analog broadcasting, and some areas are testing digital broadcasting or soon. Planning to implement or implement Therefore, the spread of digital TV that can cope with such digital broadcasting is rapidly spreading.

The digital terrestrial broadcasting system compresses and transmits digital video and audio data using a predetermined compression algorithm, for example, a hybrid encoding algorithm, and restores the video and audio data, which are compressed and transmitted, to the original data and serves the viewer. The data included in the digital broadcast signal and transmitted include various control data for managing and controlling the operation of the digital broadcast receiver in addition to the compression-coded video and audio data described above.

In addition, digital broadcasting provides various additional service functions in addition to the advantages of providing high quality video and audio. Among these various functions, an automatic billing function for internet pay programs and an Internet service function using a modem are provided. Can be.

On the other hand, MP3 is a standard for the compression method of the audio signal made in MPEG, which means MPEG Layer-3 (Layer-3). As is well known, MPEG 1, one of the MPEG data compression techniques, is a coding technique for compressing and storing video signals and audio signals up to 1.5 Mbps in a digital data storage device. There are data coding techniques for all five parts. . Three audio signal coding techniques are defined in the audio portion, one of which is defined as layer 1, layer 2, and layer 3, and MP3 is an audio data compression technique corresponding to layer 3.

This MP3 uses perceptual sensing coding technology, that is, human auditory psychological model, to allow quantization noise caused by quantization according to frequency band within a masking threshold and delay time, thereby reducing the bit rate of audio data. The loss of sound quality can be minimized. This allows MP3s to compress audio signals from 1/10 to 1/12 while maintaining the sound quality of compact disc (CD) discs, recording at least 150 songs on a 650MB CD-ROM. You can do it.

However, in the conventional general digital TV as described above, a function of converting and recording a general audio signal into such an MP3 audio signal is not provided. If the audio data input from the digital TV from the outside is converted into MP3 audio data, If the ability to compress, store and play back is added, it will not only meet the needs of a wider variety of users, but also improve the overall function of the digital TV.

Accordingly, the present invention devised in the light of the above, converts the analog audio signal input from the outside of the digital TV into digital MP3 audio data and stores it in the memory means, and stores the MP3 audio data stored at the request of the user. An object of the present invention is to provide a digital TV capable of recording and reproducing an audio signal that can be reproduced through a signal processing process.

In order to achieve the above object, the present invention converts an analog audio signal input from an external device into an MP3 audio signal in a digital TV that receives a digital broadcast signal and outputs it through a predetermined signal processing process through a plurality of signal processing means. A digital TV for recording and reproduction, comprising: means for converting an input audio signal into a digital audio signal when an analog audio signal is input from the external device; Means for converting the converted digital audio signal into a digital MP3 audio signal; Means for storing the converted MP3 audio signal; Means for decoding and outputting the stored digital MP3 audio signal based on a control signal for reproducing the stored digital MP3 audio signal; The present invention provides a digital TV capable of recording and reproducing an MP3 audio signal, including means for converting and decoding the decoded digital MP3 audio signal into an analog signal.

1 is a block diagram showing the configuration of a digital TV capable of recording and reproducing an audio signal according to a preferred embodiment of the present invention;

2 is a flowchart illustrating an operation process of a digital TV capable of recording and reproducing an audio signal according to an exemplary embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

10: microcomputer 20: tuner and demodulator

30: demultiplexer 40: audio decoder

50: Audio DAC 60: External Audio Input

70: audio encoder 80: memory section

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

1 is a block diagram showing the configuration of a digital TV capable of playing and reproducing an MP3 audio signal according to a preferred embodiment of the present invention. The microcomputer 10, the tuner and the demodulator 20, and the demultiplexer 30 are shown in FIG. ), An audio decoder 40, an audio DAC 50, an external audio input unit 60, an audio encoder 70, and a memory unit 80.

Referring to the drawing, the microcomputer 10 generates a control signal corresponding to a key signal applied from a key input unit, not shown, and the operation of each component provided in the digital TV by a preset control routine. It generates various control signals for controlling.

The tuner and demodulator 20 receives a digital terrestrial broadcast signal received through an antenna (not shown), receives a broadcast signal having a corresponding frequency band based on the tuning control signal of the microcomputer 10, and then retains a VSB (residual signal). Sideband) to output through demodulation process and error correction process. The demultiplexer 30 separates the demodulated broadcast signal output from the tuner and the demodulator 20 into video data, audio data, and various additional data. In this case, the video data separated from the demultiplexer 30 is displayed on the monitor through a video decoder and a video signal processor (not shown).

Then, the audio data separated from the demultiplexer 30 is decoded by the audio decoder 40 and then converted into an analog signal through the audio DAC 50 and output through the speaker (not shown). In particular, the audio decoder 40 includes a decoding processing routine for decoding MP3 audio data and an AC-3 type decoding processing routine for decoding the audio signal of the digital terrestrial broadcast signal. Decoding and decoding of the MP3 audio signal input and stored from the outside are selectively performed by the control of the microcomputer 10.

The external audio input unit 60 receives an analog audio signal input from an external device (for example, a CD player, an audio system, etc.) connected to the digital TV, converts the digital audio signal into a digital audio signal, and provides the same to the audio encoder 70. . That is, the external audio input unit 60 includes an input terminal for receiving an analog audio signal from an external device and an A / D converter for converting the input analog audio signal into a digital audio signal. The audio encoder 70 converts the digital audio signal provided through the external audio input unit 60 into an MP3 audio signal through an MP3 compression technique. The converted MP3 audio signal is converted into a memory unit through the microcomputer 10. 80 is stored.

After the analog audio signal input from the outside through the above process is converted into a digital MP3 audio signal and stored in the memory unit 80, when the user wants to reproduce it, the microcomputer 10 stores the memory unit 80. MP3 audio data stored in the readout is provided to the audio decoder 40, and the audio decoder 40 decodes the MP3 audio signal provided from the microcomputer 10 and outputs it through the audio DAC 50. Recording of the MP3 audio signal and reproduction of the recorded MP3 audio signal are enabled.

2 is a flowchart illustrating an operation process of a digital TV capable of recording and reproducing an MP3 audio signal according to an exemplary embodiment of the present invention. Referring to the drawings, the series of processes described above are described in detail as follows. .

While the overall operation of the digital TV configured as shown in FIG. 1 is in a standby mode for performing a specific command input by a user or in a normal viewing mode in which an arbitrary broadcast channel is received and displayed (step 201), not shown When a key signal for converting the overall operation of the digital TV into the audio signal recording mode is input from the input key input means (step 203), the microcomputer 10 switches the operation mode of the digital TV in response to the input key signal. The mode is switched to (step 205).

When an analog audio signal is input from an external device connected to the digital TV through the external audio input unit 60 (step 207), the external audio input unit 60 converts the analog audio signal into a digital audio signal to the audio encoder 70. The audio encoder 70 converts the converted digital audio signal back into a digital MP3 audio signal through an MP3 compression technique (step 209). At this time, the microcomputer 10 stores the converted MP3 audio data in a predetermined area of the memory unit 80 (step 205).

If the external audio signal recording mode is terminated while the analog audio signal input from the external device is converted to the digital MP3 audio signal by repeating this process (step 213), the microcomputer 10 performs the overall operation of the digital TV. Switch to the standby mode or the normal viewing mode as in the initial step 201 described above (step 215).

At this time, if the user inputs a key signal for reproducing the MP3 audio data stored in the memory unit 80 using the key input means (not shown) (step 217), the microcomputer 10 responds to the input key signal. MP3 audio data stored in the memory unit 80 is read and provided to the audio decoder 40 (step 219), and the audio decoder 40 performs a decoding process on the MP3 audio signal and is provided from the microcomputer 10. The MP3 audio data is decoded and output (step 221). In this case, the decoded MP3 audio data is converted into an analog signal through the audio DAC 50 and then output to the speaker (not shown) (step 223), thereby converting the analog audio signal input from the digital TV into the MP3 audio signal. You can convert it, record it, and play it back.

As described above, according to the present invention, an analog audio signal input from an external device in a digital TV can be converted into a digital MP3 audio signal using MP3 compression and stored, and the MP3 audio data stored by the user's request can be reproduced. By doing so, there is an effect of improving the overall performance of the digital TV, and thus there is an effect that can meet the needs of a wider variety of users.

Claims (1)

In the digital TV, which receives a digital broadcast signal and outputs the signal through a plurality of signal processing means, the analog TV audio signal input from an external device is converted into a moving picture expert group layer-3 (MP3) audio signal and recorded. In digital TV playing and playing, Means for converting the input audio signal into a digital audio signal when an analog audio signal is input from the external device; Means for converting the converted digital audio signal into a digital MP3 audio signal; Means for storing the converted MP3 audio signal; Means for decoding and outputting the stored digital MP3 audio signal based on a control signal for reproducing the stored digital MP3 audio signal; And a means for converting and outputting the decoded digital MP3 audio signal into an analog signal.