JPH09298728A - Mpeg reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cancel the unnaturality of a joint by detecting the EOR/EOF of a stream data file and applying fade-out or fade-in to the joint between the files of the stream data file. SOLUTION: When every EOF of the stream data file is detected by a detecting means 33, a padding means 32 inserts video padding data(VPD) for a prescribed length at the head of stream data file of a background picture. In the case of reproducing this data file, when the EOR/EOF of that file is detected by an EOR/EOF detecting means 34, fade-out processing is performed just for a prescribed time by a fade-out means 35 and during this processing, the VPD are decoded so that the continuity of MPEG information can be kept. Next, when the head frame of the next file is detected by a head detecting means 36, fade-in processing is performed by a fade-in means 37, and the data of this file are successively decoded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an MPEG playback device, and more particularly to fade-out at a file joint,
The present invention relates to an MPEG playback device that can be naturally joined by performing fade-in processing.

[0002]

2. Description of the Related Art Generally, a karaoke device popular in restaurants, karaoke boxes, homes, etc., plays back accompaniment music by playing back MID information corresponding to the user's selection of music, and displays it on a monitor. Displays a video and lyrics characters corresponding to the reproduced music, and sings a song by referring to the lyrics characters. Here, the moving picture information is generally encoded in MPEG format and stored in a hard disk drive or the like because it can be highly compressed, and at the time of reproduction, corresponding data files are sequentially read from the hard disk and reproduced. It will be.

[0003]

By the way, in the reproducing apparatus for reproducing this kind of data, when the marking data indicating the end of the stream data file, that is, EOF is detected in the supplied data, Wait until the data file is sent and play from the beginning of the stream data file of the next scene. For this reason, the waiting time at the seams of files is not constant and varies, resulting in an unnatural seam such as suddenly becoming the next scene after the image of the previous scene is still. was there. The present invention focuses on the above problems and was devised to solve them effectively. Its purpose is to provide a fade-out and a fade-in at the joints between stream data files to thereby make the joints. Provided is an MPEG playback device capable of eliminating unnaturalness in the above.

[0004]

In order to solve the above-mentioned problems, in the MPEG reproducing apparatus for continuously outputting individual stream data files from a video server storing information in MPEG format and reproducing the stream data files, Padding means for padding video padding data of a predetermined length at the beginning of the stream data file, and E for detecting EOR / EOF of the stream data file
OR / EOF detection means, fade-out means for fading out data at a predetermined fade-out time after the EOR / EOF, head detection means for detecting the head of the stream data file, and predetermined fade-in data after the head. And a fade-in means for fading in with time.

Since the present invention is configured as described above, when a series of stream data files is stored in the video server, EO indicating the end of the stream data file is displayed.
Padding data is inserted or padded between F and the beginning of the next file. When reproducing this file, when the EOR / EOF detection means detects EOF, data processing for fading out is executed,
Further, the fade-in process is executed when the beginning of the next file is detected. As a result, the seams of the files are naturally moved. Also, by outputting black data and EOR at the time of reading the first file, fade-out is executed for this black data, and when the frame of the first file is decoded, fade-in is executed. The fade-in is performed at the start of playback, and the sound becomes natural.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an MPEG reproducing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the case where the MPEG playback device is applied to a communication karaoke device will be described as an example.

In FIG. 1, the information center 1 has a large number of communication karaoke devices 2 under its control, and each karaoke device 2
, The predetermined data can be transmitted via a public line 3 such as a telephone line. In FIG.
Only one communication karaoke device 2 is shown. As information about the music, MIDI (Mus
ical Instrument Digital I
interface information and other lyric characters,
The chorus information, moving picture information, etc. are compressed and supplied by the MPEG system.

A communication karaoke apparatus 2 which constitutes an MPEG reproducing apparatus has a control unit 4 including a microprocessor for controlling the operation of the apparatus as a whole, such as a modem or an IS.
Data is taken in via the transmitting / receiving unit 5 made of DN. Reference numeral 6 denotes a video server connected to the bus 7, which is composed of, for example, a large-capacity hard disk, and a series of data transmitted from the information center 1 is stored in this server 6. Reference numeral 8 denotes an input instructing unit, which allows selection of music and input of various commands. A reproducing unit 9 reproduces the moving image information read from the video server 6 and displays it on the monitor 10, or MID.
The I information is reproduced and the accompaniment music is reproduced from the speaker 11. Reference numeral 12 denotes a microphone, which reproduces the user's voice input from the microphone from the speaker 11.

Next, the reproducing section 9 will be described in detail with reference to FIG. The signal read from the video server 6 is
After being amplified by the RF amplifier 13, it is applied to the decoder / servo control circuit 14. The second CPU 15 has a memory for temporarily storing the data read from the TOC (Table Of Contents) area of the disc in a predetermined table format, and takes in the subcode data to input information from the input instructing unit 8. The decoder / servo control circuit 14 is controlled accordingly. The control circuit 14 also performs servo control on the video server 6. The input instruction unit 8 is, for example, PLAY.
Button, STOP button, FF button, RF button, J
It has a UMP (jump) button and the like, and the display unit 16 displays an operation mode, a device abnormality, and the like. The audio signal processing circuit 17 converts the reproduced digital audio signal into an analog signal and performs de-emphasis processing. The above circuit is a circuit for reproducing a hard disk dedicated to music.

The circuit system shown in the alternate long and short dash line is a video signal system additionally provided to the signal system of the hard disk dedicated to music. The first CPU 18 and the ROM 1
9, a DRAM 20, an MPEG / photo decoder 21, a video signal processing circuit (SSG) 22, an NTSC / PAL encoder 23, and crystal oscillators 24, 25 and 26.
The first CPU 18 controls the second CPU 15 and the MPEG / photo decoder 21 to control the entire apparatus. In particular, the first CPU 18 applies fade-out to the end of the data file and fade-in to the beginning of the data file.

The MPEG / photo decoder 21 is a ROM in which a program for controlling the entire apparatus is stored in advance.
19 and a DRAM 20 for storing a compressed video signal input from the decoder / servo control circuit 14 via a 4-bit data bus b1, and an image necessary for displaying the compressed signal on a normal single screen. Restores data or expands audio signals. MPEG / photo decoder 2
An 8-bit data bus b2 for transmitting mode information and for obtaining status, which is the processing status of the program in the decoder 21, between the first CPU 18 and the first CPU 18.
A 7-bit data bus b3 for transmitting and receiving data address information and a control signal for controlling the decoder 21, and a 1-bit data bus b4 for obtaining input information of a data string to be input to the decoder 21. , And is connected via a 3-bit data bus b5 for audio status.

The video signal processing circuit 22 converts the digital audio signal demodulated by the decoder 21 into an analog signal, converts the RGB signal, the luminance signal and the color difference signal into a composite signal and outputs the composite signal to the NTSC / PAL encoder 23. The NTSC / PAL encoder 23 converts this composite signal into an NTSC system or PAL system signal and outputs it to the monitor 10, which is an external display. The crystal oscillator 24 generates a master clock for operating the decoder 21, and the crystal oscillator 25 is suitable for the processing of the video signal processing circuit 22 at 13.5 MHz or 27 MH.
The z-clock is generated, and the crystal oscillator 26 causes the encoder 2
3,5,945 MHz (N
TSC) or 4.43361875 MHz (PAL).

Next, the MPEG / photo decoder 21 will be described in detail with reference to FIG. The decoder 21 has a RISC processor 27, a variable length code decoder (VLD) 28 and three interfaces 29 to 31. The RISC processor 27 not only controls the VLD 28 and the interfaces 29 to 31, but also MPE
Decoding G1 syntax, 2D IDCT, inverse quantization,
Performs motion vector calculation.

As the interfaces 29 to 31, the host bus interface 29 inputs the compressed data stream and sets the internal registers, the video display processor 30 outputs the decoded image, and the DRAM controller 31 is shown in FIG. DRAM2
Control 0. DRAM 20 is a maximum of 1 Mbyte,
It is used as a rate buffer, a reference image memory, a display memory, and a RISC instruction memory. DR
The interface with AM20 is 16 bits. Here, the processing amount of MPEG1 is 1/6 that of MPEG2.
Hereinafter, the memory bandwidth is 1/4 or less. The actual pixel rate is about 3.3 MHz assuming a SIF (source input format) screen, and most of the decoding process can be performed by sequential processing using RISC operating at 40 MHz.

Next, a functional diagram of the present invention will be described with reference to FIG. In FIG. 4, reference numeral 32 is a padding means, and when the received data sent from the transmitter / receiver 5 is stored in the video server 6, it has a predetermined length at the beginning of each stream data file of the background image information in the MPEG format. Sano video padding data is inserted. The padding data is information indicating that the MPEG data continuously flows as a stream, and here, padding data having a length of, for example, 150 msec is inserted. Reference numeral 33 is EOR / EOF detection means 33,
The end of each data file is detected in order to insert the padding data. These two means 3
The operations 2 and 33 are processed by software by the control unit 4 shown in FIG. 1, for example.

Returning to FIG. 4, reference numeral 34 is EOR /
It is an EOF detection means, and detects the end of each stream data file of the MPEG format which is the background image read from the video server 6. Reference numeral 35 is a fade-out means, which executes the fade-out when the detecting means 34 detects the end (EOF) of the file. Here, the fade-out time is the same as the padding data, for example, 150 msec.
Is set. Reference numeral 36 is a head detecting means for detecting the head of each stream data file. Also, reference numeral 3
Reference numeral 7 denotes a fade-in means, which executes the fade-in when the head detecting means 36 detects the head of the file. Here, for example, 90 msec is set as the fade-in time. Each of these means 34, 3
The functions of 5, 36, and 37 are, for example, the first CPU in FIG.
18 is executed by pre-assembled software.

Next, the operation of the present invention configured as above will be described. First, the overall flow will be described. In FIG. 1, music information regarding a large number of music is transmitted from the information center 1 to the communication karaoke apparatus 2 via the public line 3 periodically, irregularly, or in response to a request. In this case, the accompaniment information of the music is MI
As DI information, background information such as lyric characters and videos is M
It is sent in a compressed state in the PEG format. These pieces of transmission information are stored in the video server 6 having a large capacity such as a hard disk. At this time, as shown in FIG. 4, when each EOF of the stream data file is detected by the detecting means 33, the padding means 32 inserts video padding data of a predetermined length at the beginning of the background image stream data file. . FIG. 5 shows the state of the stream data file stored in the video server 6, and the video padding data VPD is inserted between the EOF of the immediately preceding file and the beginning of the scene of the next file. At the time of reproduction, the user inputs a desired music number from the input instructing unit 8 to select a music, and the control unit 4 reads the music information corresponding to this from the video server 6, and the MIDI information and MPEG information are reproduced by the reproducing unit 9. The accompaniment music is output from the speaker 11, and the lyrics characters and the background image are output from the monitor 10.

When EOR / EOF of the file is detected during reproduction of this data file, a fade-out process is performed for a predetermined time, during which padding data VPD is decoded to maintain continuity of MPEG information. In addition, when the first frame of the next file is detected, the fade-in process is performed and the data of this file is decoded. Therefore, the joint between the files does not become unnatural, and for example, the first scene of the next file is not suddenly displayed while the last scene is being displayed. It becomes possible.

Next, the flow of the above operation will be described with reference to the flowchart shown in FIG. First, as described above, the stream data file stored in the video server 6 is an E indicating the end of the previous file, as shown in FIG.
Video padding data VPD is inserted between the OF and the beginning of the next file. In the illustrated example, the padding data VPD is inserted between the EOF provided at the end of the scene n of the previous file and the scene n + 1 of the next file.

When such data is read from the video server 6 and supplied to the reproducing unit 9 in accordance with the user's selection of music, the data is reproduced by the flow shown in FIG. First, the supplied data files are sequentially MPEG-decoded (hereinafter simply referred to as "decode") by the MPEG / photo decoder 21 (S1), and the end of the file (EO) is reached.
It is checked whether the EOF flag is present to detect F) (S2). If EOF is detected here (YES in S2), decoding is continued (S2).
3) Perform data processing for fade-out (S
4). The padding data is decoded in S3.

This fade-out is performed for a predetermined time, for example, 150 msec, and the fade-out operation is performed by repeating S3 and S4 until the fade-out end time has elapsed (N0 of S5). Then, when the fade-out operation ends after a predetermined time has passed (S
5), the decoding is subsequently performed (S
6) It is detected whether or not the frame data of the first scene of the next file has been decoded (S7). Here, when the frame data of the leading scene of the next file is detected (YES in S7), data processing for executing fade-in is performed (S9). This fade-in is performed for a predetermined time, for example, 90 msec. If this time has not elapsed (NO in S9), the decoding is further continued (S10) and the process returns to S8 to continue the fade-in operation. If the fade-in end time is reached (Y in S9
S) and return to S1 and repeat the above operation.

As described above, since the connection between files is connected by the fade-out process and the fade-in process, the displayed image smoothly moves to the next scene,
Unnaturalness of joints can be eliminated. In the above embodiment, as shown in FIG. 5, nothing is added to the beginning of the first file, and the EOF of the previous file and the first scene of the next file are added to the second and subsequent files. Although the padding data VPD is inserted between them, the present invention is not limited to this, and as shown in FIG. 7, the padding data VPD may be provided even at the beginning of the first file. Then, in this case, as shown by the broken line in FIG. 4, the start control means 38 for outputting the EOR data and the black data first from the video server 6 at the start of the video output is provided. The function of the control unit 38 is executed by software by the control unit 4, for example.

The flow in this case is shown in FIG.
First, when serial data as described above is read,
The video server 6 not only sends the file data, but also checks whether or not it is the first file to detect the start of the image (S11), and when it is the first file (YES in S11), Start control unit 38
The video server 6 outputs the EOR data in response to the command (see FIG. 4) (S12), and then transmits the black data for a predetermined time, that is, the time required for fade-out, for example, about 150 msec (S13 and S14). And
If the black data has been sent for a predetermined time, then normal file data will be sent next (S15).

If the file is not the first file in S11, that is, if the answer is NO, the process directly skips to S5 to output normal file data. When the reproducing unit 9 inputs such data, when EOF is detected as shown in the flowchart of FIG. 6, (S
2) Fade out the black data (S3
~ S5) Further, while decoding (S6), it is checked whether the frame data of the leading scene is decoded (S7), and if the frame data of the leading scene is detected, fade-in is executed. Becomes (S
8). According to this, since the fade-in can be performed even when the first file is displayed at the start of the image, the image display can be naturally started. The reason why the black data is sent first and fade-out is performed is that the fade-out and the fade-in are always performed as a pair so that the fade-in is performed for the first file. Before that, I'm going to do an empty fade-out. In the above embodiment, the communication karaoke apparatus is described as an example of the MPEG reproducing apparatus, but it is not limited to this.

[0025]

As described above, the MPEG of the present invention is used.
According to the reproducing device, the following excellent operational effects can be exhibited. Insert video padding data at the joints between individual files in the stream data file,
Since the fade-out and the fade-in are performed at the time of this reproduction, it is possible to smoothly and naturally switch the scenes at the joints of the files. Furthermore,
By adding the video padding data to the first file of the stream data file, it is possible to perform fade-in at the start of image display, and to start the image with a natural feeling.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an MPEG playback device of the present invention.

FIG. 2 is a specific configuration diagram mainly showing a reproducing unit of FIG.

FIG. 3 is a specific configuration diagram showing the decoder in FIG.

FIG. 4 is a functional diagram of the present invention.

FIG. 5 is a diagram showing a stream data file in which video padding data is inserted.

FIG. 6 is a flowchart showing a flow at the time of reproducing data.

[Fig. 7] Fig. 7 is a diagram illustrating a stream data file in which video padding data is also inserted at the beginning of the first file.

8 is a flowchart showing a flow at the time of reproducing the data file shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Information center, 2 ... Communication karaoke apparatus (MPEG reproducing apparatus), 4 ... Control part, 5 ... Transmitting / receiving part, 6 ... Video server, 8 ... Input instruction part, 9 ... Playing part, 10 ... Monitor, 32
... padding means, 33, 34 ... EOR / EOF detection means, 35 ... fade-out means, 36 ... head detection means,
37 ... Fade-in means, 38 ... Start control means, V
PD: Video padding data.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G11B 15/02 391 G11B 15/02 391 15/06 15/06 P

Claims (2)

[Claims] 1. An MPEG playback device for continuously outputting individual stream data files from a video server storing information in MPEG format and playing back the stream data files, wherein a video padding of a predetermined length is provided at the beginning of the stream data file. Padding means for padding data, EOR / EOF detection means for detecting EOR / EOF of the stream data file, and EOR / EO
After F, a fade-out means for fading out the data at a predetermined fade-out time, a head detecting means for detecting the head of the stream data file, and a fade-in means for fading in the data after the head for a predetermined fade-in time. MP characterized by having
EG regeneration device. 2. The MPE according to claim 1, further comprising start control means for initially outputting EOR data and black data from the video server at the start of image output.
G playback device.