KR20030084428A - Digital audio apparatus and image display method thereof - Google Patents

Abstract

The present invention discloses a digital audio device and an image display method thereof. The apparatus stores digital audio data encoded at the time of recording and video data corresponding to sound pressure, and outputs the digital audio data encoded at the time of playback and video data corresponding to sound pressure, and frames from the memory at the time of playback. A decoder that decodes the encoded digital audio data output in units, finds the maximum size data of the decoded digital audio data in units of frames output from the decoder at the time of playback, calculates the negative pressure, and image data corresponding to the negative pressure. And a control unit for reading from the memory, a display unit for displaying image data output from the memory, and an audio signal reproducing unit for converting and amplifying digital audio data output from the decoder into an analog signal. Accordingly, the image data corresponding to the negative pressure is stored, and the image data corresponding to the change in the negative pressure of the reproduced digital audio data is displayed on the display to satisfy not only the hearing but also the visual sense of the consumers.

Description

Digital audio apparatus and image display method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio device, and more particularly, to a digital audio device capable of displaying an image in accordance with a change in sound and a method of displaying an image thereof.

Conventional digital audio apparatuses such as MP3 players have only a function of decoding and outputting encoded data.

However, as the needs of consumers using digital audio devices are diversified, manufacturers of digital audio devices continue to make efforts to satisfy not only audio functions but also visual functions.

That is, if the image displayed on the display unit can be changed according to the music from the digital audio device, the digital audio device having a better function may be provided to the consumer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital audio device capable of displaying an image while changing an image according to a change in sound pressure of digital audio data to be reproduced.

Another object of the present invention is to provide a video display method of a digital audio device for achieving the above object.

The digital audio device of the present invention for achieving the above object stores the encoded digital audio data and video data corresponding to the sound pressure at the time of recording, and the video corresponding to the encoded digital audio data and sound pressure at the time of reproduction. A memory for outputting data, a decoder for decoding the coded digital audio data output in units of frames from the memory at the time of reproduction, and searching for data of the maximum size among the decoded digital audio data in units of frames output from the decoder at the time of reproduction; Control means for calculating a negative pressure and reading image data corresponding to the negative pressure from the memory, display means for displaying image data output from the memory, and the digital audio data output from the decoder. Anal It converted into a signal and amplifies it, characterized in that it comprises a sound signal reproducing means for converting a sound signal.

According to another aspect of the present invention, there is provided a video display method of a digital audio device according to the present invention. The video display method of the digital audio device includes a memory storing encoded digital audio data and video data corresponding to a negative pressure. Reading digital audio data stored in a memory on a frame-by-frame basis, decoding the read frame data, inputting the decoded digital data on a frame-by-frame basis, and finding a maximum loudness level; Normalizing by dividing by a predetermined value, multiplying the normalized value by a predetermined number, converting the normalized value into an integer value, and calculating negative pressure; and outputting and displaying image data corresponding to the calculated negative pressure from a memory. Characterized in having a.

1 is a block diagram of an embodiment showing a configuration of a digital audio device of the present invention.

2 is a flowchart illustrating an image display method of a digital audio device according to the present invention.

Figure 3 shows the image data according to the negative pressure of the embodiment of the present invention.

Fig. 4A shows waveforms of the digital data of the embodiment output from the decoder of the digital audio device of the present invention.

Fig. 4B shows image data of the embodiment displayed on the graphic LCD of the digital audio device of the present invention.

* Brief description of the symbols of the main parts of the drawings *

100; Computer 110; Digital audio device

10; Control unit 12; Memory

14; A USB interface unit 16; Graphic LCD

18; Key input unit 20; Decoder

22; Digital / analog conversion circuit 24; amplifier

26; speaker

Hereinafter, a digital audio device and an image display method of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of an embodiment showing a configuration of a digital audio device of the present invention, which includes a computer 100, a control unit 10, a memory 12, a universal serial bus (USB) interface unit 14, and a graphic LCD ( Liquid crystal display), key input unit 18, decoder 20, digital / analog conversion circuit 22, amplifier 24, and speaker 26. .

The function of each of the blocks shown in FIG. 1 will be described below.

The controller 10 stores in the memory 12 encoded digital audio data and / or image data corresponding to a loudness level, which are input through the USB interface unit 14 during recording, and stored in the memory 12 at the time of reproduction. The encoded digital audio data is read out, and image data corresponding to the loudness of the read digital audio data is read out from the memory 12 and displayed on the graphic LCD 16. Upon erasing, the digital audio data and / or video data stored in the memory 12 are erased. The memory 12 stores, reads, and erases the encoded digital audio data under the control of the controller 10. The USB interface unit 14 inputs the encoded digital audio data input through the external computer 100 and outputs the digital audio data stored in the memory 12 to the external computer 100. The graphic LCD 16 displays graphic information and information related to recording, playback, and erasing. The key input unit 18 inputs commands such as recording, playback, erasing, fast forward, fast backward, track selection, and volume control by the user's key manipulation. The decoder 20 decodes the encoded digital audio data output from the controller 10. The digital / analog conversion circuit 22 converts the decoded digital audio data output from the decoder 20 into an analog signal. The amplifier 24 amplifies the analog signal under the control of the controller 10. The speaker 26 converts an analog signal into an acoustic signal. The computer 100 includes a program for downloading digital audio data encoded by the digital audio device 110 and a program for downloading image data according to the loudness of the digital audio device 110. 14) the encoded digital audio data and the image data according to the loudness are transmitted. In this case, the encoded digital audio data and image data according to the loudness of the transmitted sound are stored in the memory 12.

That is, the digital audio device of the present invention stores the digital audio data and the image data encoded from the computer 100 in the memory 12, and reproduces the encoded digital audio data at the time of reproduction, Image data according to the loudness is displayed on the graphic LCD 16.

FIG. 2 is a flowchart illustrating an image display method of the digital audio apparatus according to the present invention. FIG. 2 illustrates an operation in a case where digital audio data and image data encoded from an external computer 100 are stored in the memory 12 and reproduced. To indicate.

When a play command is applied through the key input unit 18, the controller 10 reads frame data from the memory 12 (step 200). In general, one file is composed of a plurality of frames, and the controller 10 stores and reads data in the memory 12 in units of frames.

The control unit 10 determines whether the end of the file (step 210).

If the determination result of step 210 is the end of the file, the operation is terminated. If not, the read frame data is output to the decoder 20, and the decoder 20 decodes the frame data (step 220).

The digital / analog conversion circuit 22 converts the decoded digital data into an analog signal (step 230).

The amplifier 24 amplifies the analog signal (step 240).

The speaker 26 converts the amplified analog signal into an acoustic signal (operation 250).

That is, the digital audio data is reproduced through the steps 230 through 250.

After operation 220, the controller 10 inputs the decoded frame data output from the decoder 20 to find the maximum value of the loudness of the decoded frame data (step 260).

The maximum value is divided by a predetermined number and normalized to a value between 0 and 1 (step 270).

The negative pressure is calculated by multiplying the normalized value by a predetermined number and converting the result into an integer value (step 280).

The image data corresponding to the negative pressure is read from the memory 12 (operation 290).

The read image data is displayed on the graphic LCD 16 (step 300).

That is, image data corresponding to the negative pressure of the frame data is displayed on the graphic LCD 16 through steps 260 through 300.

3 illustrates image data according to a negative pressure according to an embodiment of the present invention, and illustrates image data selected according to a value calculated in operation 280 of FIG.

As shown in Fig. 3, 12 different image data are inputted through the USB interface unit 14 by executing a program of the computer 100 with 12 different image data according to negative pressures of 1 to 12. It stores in the memory 12.

Fig. 4A shows the waveform of the digital data of the embodiment output from the decoder of the digital audio device of the present invention, wherein the waveform indicated by L indicates the waveform of the digital data of the left channel, and the waveform indicated by R indicates the digital data of the right channel. The horizontal axis represents time and the vertical axis represents the loudness.

The controller 10 inputs frame data of a total of 22 left or right channels output from the decoder 20 to find the maximum loudness of the frame data corresponding to the frame number, and according to the method of FIG. Will be calculated.

Frame number One 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Negative size (k) 10 10 8 9 7 6 5 6 6 6 9 7 8 35 15 9 11 8 10 35 35 12 Negative pressure 3 3 3 3 2 2 2 2 2 2 3 2 3 12 5 3 4 3 3 12 12 4

The method used to obtain the result of Table 1 is normalized by dividing the maximum loudness by 35000. For example, if the maximum loudness is 10000, divide 10000 by 35000 to get a value of 0.28. This value is multiplied by 10 to obtain a value of 2.8, which is then converted to an integer value. In other words, when the maximum loudness is 10, the negative pressure becomes 3.

In this way, the negative pressure on the frame data of the digital data shown in Fig. 4A is calculated.

Fig. 4B shows the image data of the embodiment displayed on the graphic LCD of the digital audio device of the present invention. When the image data shown in Fig. 3 is stored in the memory, the image data according to the negative pressure of the table from the memory 12 The output is sequentially displayed on the graphic LCD 16.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

The digital audio device and the image display method of the present invention store the image data according to the negative pressure, and display the image data corresponding to the change in the negative pressure of the digital audio data to be reproduced by the consumer Not only hearing, but also visual satisfaction.

Therefore, it is possible to meet the needs of consumers who want more various functions.

Claims (3)

A memory for storing the encoded digital audio data and video data corresponding to the negative pressure at the time of recording and outputting the encoded digital audio data and video data corresponding to the negative pressure at the time of reproduction; A decoder for decoding the encoded digital audio data output in units of frames from the memory at the time of reproduction; Control means for finding a data of the maximum magnitude among the decoded digital audio data output from the decoder at the time of reproduction, calculating a negative pressure, and reading image data corresponding to the negative pressure from the memory; Display means for displaying image data output from the memory; And And audio signal reproducing means for converting the digital audio data output from the decoder into an analog signal, amplifying the signal, and converting the digital audio data into an audio signal. The method of claim 1, wherein the control means And normalizing the data of the maximum magnitude by a predetermined number, multiplying the normalized value by a predetermined number, and converting the negative pressure into an integer value. An image display method of a digital audio apparatus having a memory storing encoded digital audio data and image data corresponding to a negative pressure, Reading digital audio data stored in the memory in units of frames; Decoding the read frame data; Finding maximum loudness by inputting the decoded digital data in frame units; Calculating a negative pressure by dividing and normalizing the maximum loudness by a predetermined value, multiplying the normalized value by a predetermined number, and converting the normalized value to an integer value; And And displaying and outputting image data corresponding to the calculated negative pressure from a memory.