KR20050053047A - A digital recorder having automatic chapter marking function using audio signal information and a automatic chapter marking method for the digital recorder - Google Patents

Abstract

The present invention relates to a digital recorder and a method for automatically marking chapters at a position where a broadcast program is changed or at a position where an advertisement broadcast is transmitted by determining the type of the broadcast signal when the broadcast signal is recorded in a DVD standard using a digital recorder. It is about. In accordance with another aspect of the present invention, a digital recorder having an automatic chapter marking function includes: a receiver for receiving a broadcast signal; A voice signal processor extracting voice information from the received broadcast signal to determine a type of the broadcast signal, and having a first output for outputting the received broadcast signal and a second output for outputting broadcast signal type information; The broadcast signal and the broadcast signal type information are respectively received from the voice signal processor, and the analog broadcast signal is encoded into the DVD standard. When the input broadcast signal type is changed, the broadcast signal type is changed to the broadcast signal position. A processor for marking chapters; And a recording apparatus for recording the broadcast signal encoded in the DVD standard onto a recording medium.

Description

Digital recorder with automatic chapter marking function using audio signal information and a automatic chapter marking method for the digital recorder}

The present invention relates to an automatic chapter marking method of a digital recorder, and more particularly, to determine the type of broadcast signal when a broadcast signal is recorded in a DVD standard using a digital recorder, and thus the position or advertisement broadcast where the broadcast program is changed. The present invention relates to a digital recorder and a method for automatically marking chapters at a sending position.

In today's multimedia era, video, audio, text, and the like are all required to be processed. To this end, a recording and reproducing medium capable of small size, large capacity, and high speed processing is required. It is DVD designed to meet all of these conditions. Starting from home video information media, the key point is that MPEG-2 video compression and AC-3 stereo surround sound are the key features. DVDs can hold more than two hours of movies on discs, such as compact discs (CDs), with clear picture quality and superb sound that surpasses theatres. The recording capacity of one DVD is 4.7GB, which is 6 ~ 8 times that of a normal CD. The standard of DVD-Video is 3.4GB of 4.7GB for video, and the remaining 1.3GB for additional data such as audio and subtitles. Was assigned to. On the other hand, DVD can be used not only as an image medium capable of containing high-quality movies but also as a next-generation DVD-ROM of CD-ROM, a read-only computer storage device. This frees up high-capacity storage for multimedia, freeing up huge amounts of data, video, and sound. In general, DVD was originally developed with a primary purpose of 'enhancing video functions' and was used as an abbreviation of Digital Video Disk, but now it is used to show its wide use. Versatile Disk) is the official name.

Because of this advantage, in recent years, instead of the conventional general recording apparatus such as a video tape recorder (VTR) for recording audio and video on a magnetic tape, a DVD recorder for recording audio and video (AV) and the like in the above-described DVD standard. Digital recorders such as these have become common and widespread. The digital recorder, which can be used instead of the standard VTR, receives a television broadcast, encodes the received broadcast's TV signal based on the above-described international standard MPEG2, converts it into digital AV data, and then converts it onto a hard disk or DVD-RW. The digital AV data is recorded in the DVD standard. When playing back the recorded digital AV data, the digital AV data is read from the recording medium, the read AV data is converted into an analog AV signal, and the converted signal is output to the display screen.

When a video is recorded in a DVD standard on a recording medium such as a DVD-RW or a hard disk using a digital recorder as described above, it is normally recorded in units of titles and chapters. The title and chapter are basically units that are used as a standard for the user to manage and search for images. For example, a title may correspond to an entire movie and is the largest unit in the data structure from the user's point of view. If a user saves several movies on one DVD-R (Recordable) or DVD-RW (Rewritable), there will be multiple titles on one DVD-R or DVD-RW. You can search. On the other hand, from the user's point of view, the title is a very large concept, so that the title can be quickly skipped to the next scene by using the concept of a chapter divided into several contents. For example, in the case of a music CD, the whole recorded on the CD is one title and each song corresponds to a chapter. In the case of recording a broadcast signal in a digital recorder such as a DVD recorder for recording a video in the DVD standard, one recording event is usually recorded as one title, and as described above, it is easy to search within this title. Multiple chapters are marked for this purpose.

The chapter marking function of the digital recorder currently developed and used is provided in two ways. One is the manual marking method which marks the chapter directly at the desired position. The other is the digital recorder which has a certain time interval. This is a way of marking chapters arbitrarily.

The manual marking method is a method in which a chapter is manually recorded by using a chapter marking key at a desired position while the user watches the recorded title after the recording of the title is finished. Therefore, it is quite inconvenient for the user since the user has to view the recorded title again after recording the title and directly operate the digital recorder. In addition, there is a problem that retrieval using chapters is not possible because no chapters are recorded at the time of the first viewing after the title is recorded.

On the other hand, the method of marking chapters at regular time intervals by the digital recorder is a method of marking chapters at intervals of 3 minutes or 10 minutes, regardless of the contents in the title. In this way, users don't have to mark chapters as they watch the title, but since they mark chapters without meaning, they are not meant as actual chapters, they are divided into chapters for simple movement within the title. It is just that. Therefore, it is impossible to search for titles effectively by this chapter marking method.

The present invention is to solve the above conventional problems. In other words, it is an object of the present invention to provide a method of marking chapters at positions where effective title searching is possible while the digital recorder performs chapter markings automatically without the user having to mark chapters one by one.

More specifically, an object of the present invention is to provide a digital recorder using audio information of a broadcast signal that facilitates retrieval of record information by automatically marking chapters on a changed portion of an advertisement or a broadcast program when recording a broadcast signal in a digital recorder. It is to provide an automatic chapter marking method.

Another object of the present invention is to provide a digital recorder having a function of automatically marking chapters when a broadcast program is changed or when an advertisement is broadcasted by employing the automatic chapter marking method as described above. .

In the present invention for achieving the above object, in the method of receiving a broadcast signal, automatically encoding the received broadcast signal in the DVD format and storing the chapter in the recording medium, the received broadcast Extracting voice information from a signal and outputting type information of the broadcast signal; Comparing the previously outputted and stored broadcast signal type information with the currently outputted broadcast signal type information; If it is determined that the type of the broadcast signal is changed, storing the current broadcast signal type information in a buffer and marking a chapter at a position of the broadcast signal whose type of broadcast signal has been changed; And recording the encoded broadcast signal on the recording medium.

In addition, the digital recorder having an automatic chapter marking function according to the present invention, the receiving unit 10 for receiving a broadcast signal; A voice signal processor 20 extracting voice information from the received broadcast signal to determine a type of the broadcast signal, and having a first output for outputting the received broadcast signal and a second output for outputting broadcast signal type information; The broadcast signal and the broadcast signal type information are respectively received from the voice signal processor, and the analog broadcast signal is encoded into the DVD standard. When the input broadcast signal type is changed, the broadcast signal type is changed to the broadcast signal position. A processor 30 for marking chapters; And a recording device 40 for recording a broadcast signal encoded in the DVD standard on a recording medium.

On the other hand, the processor 30, the first input for receiving an analog broadcast signal; A second input for receiving broadcast signal type information; An encoder 32 for encoding the received analog broadcast signal into a DVD standard; A buffer 34 for storing the received broadcast signal type information; And comparing the previously stored broadcast signal type information with the currently received broadcast signal type information, and when it is determined that the type of the broadcast signal is changed as a result of the comparison, the currently received broadcast signal type information is stored in the buffer 34, and the broadcast signal And a control unit 36 for controlling the encoder to mark the chapter at the position of the broadcast signal whose type is changed.

As described above, the conventional chapter marking method includes a method of manually marking chapters at a desired position while watching the recorded title after the recording of the title is finished, and the digital recorder arbitrarily chapters at regular time intervals. There was a way to mark it. The present invention improves the problems of the conventional chapter marking method described above, so that the user can effectively search for the recorded broadcast later while marking the chapter automatically while recording the broadcast signal in the DVD standard. To this end, the present invention takes advantage of the fact that when a broadcast signal such as a TV is received and recorded in the DVD standard, the type of voice information contained in the broadcast signal is different for each broadcast program. That is, according to the broadcast standard of Korea, broadcast signals such as stereo, voice multiplex, and mono are transmitted differently according to respective broadcast programs. For example, when a music program is broadcast in stereo voice, a commercial broadcast is monaural, and a movie program is broadcast in voice multiplex, the music program → commercial → music program → commercial → movie program. If broadcast, broadcast signal will be transmitted in the order of stereo mono → stereo → mono → voice multiple. Therefore, if the chapters are marked each time the type of the broadcast signal is changed by determining the type of the broadcast signal received, the chapters can be marked appropriately at the start and end positions of each broadcast program. You will be able to easily search for each program when you watch the content. The automatic chapter marking of the present invention uses the principle of this broadcast signal.

Then, with reference to the accompanying drawings, it will be described in detail below the specific configuration and operation of the present invention.

1 is a flowchart illustrating a process of automatically chapter marking according to the present invention, and FIG. 2 is a block diagram illustrating a schematic structure of a digital recorder capable of performing an automatic chapter marking function according to the present invention. to be. As shown in FIG. 2, the digital recorder according to the present invention includes a tuner 10, an audio signal processing IC 20, a processor 30, and a recording device 40, wherein the processor 30 is an encoder. (32), the control unit 34 and the buffer 36 further.

Now, referring to FIGS. 1 and 2, the automatic chapter marking method according to the present invention will be described. First, the digital recorder receives a broadcast signal of a specific channel selected by a user through the tuner 10 (S10). Note that although the tuner 10 is shown in FIG. 2, this is merely illustrative and other types of broadcast signal receivers are also possible. For example, an audio / video input terminal connected to an audio / video output terminal of a TV or a VTR may be used as a receiver of a broadcast signal. Those skilled in the art will be able to use a variety of devices in addition to the tuner 10 as a device for receiving broadcast signals. Therefore, hereinafter, the tuner 10 of FIG. 2 will be understood as a general broadcast signal receiving apparatus.

The broadcast signal received by the tuner 10 is input to the voice signal processing IC 20. The audio signal processing IC 20 performs two kinds of processing. As described above, the broadcast signal is transmitted in the form of stereo, voice multiplex, mono, etc. according to the broadcast program. By the way, for example, when a stereo signal is transmitted, not only a stereo signal but also a mono signal is always included. When a stereo signal is transmitted as a foreign currency, a stereo signal is usually included. The user can select to record in one of these manners through an operation button (not shown) when recording such a broadcast signal in the DVD standard. When the user's selection is transmitted to the voice signal processing IC 20 through the processor, the voice signal processing IC 20 processes and outputs the received broadcast signal so as to have only one of stereo and mono methods. . This is one of two processes that the voice signal processing IC 20 performs.

Another process performed by the voice signal processing IC 20 determines whether the voice information included in the received broadcast signal is a stereo broadcast, a voice multicast broadcast, or a mono broadcast, to determine the type of the broadcast signal. It is to output (S20). In general, a broadcast signal is transmitted by including a pilot signal for indicating various characteristics of a signal in a specific frequency band. The frequency band position of the pilot signal is defined as a specific frequency band through a broadcasting standard for each country, and the position of the pilot signal is defined differently according to whether it is a stereo broadcast, a voice multicast broadcast, or a mono broadcast. Therefore, the type information of the broadcast signal can be easily known by examining the frequency band in which the pilot signal included in the broadcast signal is located.

The broadcast signal and broadcast signal type information processed by the voice signal processing IC 20 are input to the processor 30 through first and second outputs of the voice signal processing IC 20, respectively. The processor 30 receives the broadcast signal and broadcast signal type information through a first input and a second input, respectively. At this time, the broadcast signal input to the processor 30 is an analog signal that has not been digitally processed yet. The encoder 32 of the processor 30 encodes the received analog broadcast signal into a DVD standard (S30). At the same time, the control unit 34 of the processor 30 compares the current broadcast signal type information received as the second input of the processor 30 with the broadcast signal type information previously input and stored in the buffer 36. (S30). If the current broadcast signal type information and the previous broadcast signal type information are the same, it is determined that there is no change in the broadcast program, and the broadcast signal having been encoded in the DVD standard is recorded on the recording medium through the recording device 40. (S70).

However, when the current broadcast signal type information and the previous broadcast signal type information are different from each other, the broadcast program is changed. When it is determined that the broadcast program has been changed, the controller 34 of the processor 30 stores the current broadcast signal type information in the buffer 36 (S50) and simultaneously sends a signal to the encoder 32 to mark the chapter. Then, the encoder 32 marks the chapter on the broadcast signal encoded in the DVD standard (S60), and the recording device 40 records the broadcast signal having been encoded in the DVD standard on the recording medium (S70). As the recording medium, various types of recording media such as a hard disk, a DVD-R, a DVD-RW, and the like may be used.

Here, the method of marking the chapter at a desired time position while recording the broadcast signal in the DVD standard follows the video recording (VR) standard of DVD-R or DVD-RW already defined in the DVD format. Referring to Figure 3, it will be described in more detail as follows. A unit for recording VIDEO onto a DVD disc is called a program (PG). That is, as shown in Fig. 3A, video data is recorded on a DVD disc in units of programs. Each program is composed of a plurality of cells, wherein a cell is a kind of data structure, which is a basic unit for playing a title, and a reproduction path of the title defines a reproduction order of these cells. We decide to do it.

At this time, the reproduction information for each such program is recorded in the program chain information (PGCI). As shown in FIG. 3 (b), the PGCI consists of PGC General Information, PG Information, and Cell Information (CI). The playback path is determined by referring to the information recorded in the PGCI. Here, the cell information CI includes cell general information, movie cell information (M_CI), and still picture cell information (S_CI). The M_CI is composed of Movie Cell General Inforamtion (M_C_GI) and a plurality of Movie Cell Entry Point Information (M_C_EPI). Can be defined as an entry point. That is, marking chapters can be understood as setting the M_C_EPI to a specific value. The M_C_CPI also consists of an entry point type (EP_TY) and a presentation time of entry point (EP_PTM). When the two values are set to a specific value defined by the DVD standard, The chapter is marked at the position indicated by the video cell entry point information. Therefore, in the present invention, the broadcast signal type information is captured while the broadcast signal is encoded and recorded in the DVD standard, and the moment when the broadcast signal type information is changed, the M_C_EPI is set to a specific value defined by the DVD standard. It is.

On the other hand, in the DVD standard, up to 99 chapters can be recorded in one title. The encoder 32 counts this chapter every time the chapter is marked while encoding the broadcast signal to the DVD standard, and sequentially assigns the serial number for each chapter. For example, when the broadcasting signal starts recording in the DVD standard, the first chapter marked is assigned to No. 1, and each time the broadcasting program is changed, the chapter is marked at the changed position according to the above-described method and each chapter is changed. Numbers 2 and 3 in order. When the recording is completed in this way, the user can easily search for the title recorded in the DVD standard through the chapters marked at the start and end positions of each broadcast program.

So far, the configuration and operation of the present invention have been described in detail. Here, it should be noted that the present invention is not limited only to the above-described exemplary embodiments. Those skilled in the art may make various modifications to the present invention within the scope of the technical idea of the present invention. For example, the present invention can be applied not only to a DVD disc recorder but also to all recorder devices for recording broadcast signals in the DVD standard. In addition, in the present invention, although the voice information of the broadcast signal is used as a method of dividing the broadcast signal into meaningful sections, the information of the EPG (Electric Program Guide) or the vertical blanking interval (VBI) line is carried on the line. It is also possible to use information. Furthermore, in the type of voice information, only stereo, voice multiplex, and mono are mentioned, but there may be various types of voice information such as SAP, NICAM, A2, and BIL.

All devices recording to the DVD standard provide users with basic search units in the form of chapters. These chapters should be provided to the user in meaningful units so that the user can conveniently search for titles. As described above, the present invention provides a technique for automatically marking chapters at the start and end positions of each broadcast program or an advertisement broadcast site by using voice information of the broadcast signal while recording a broadcast signal. Therefore, according to the present invention, it is not only necessary to mark chapters manually while watching the title again after the recording of the title is completed, but also provides a great convenience to the user because the chapters are automatically marked at the position where effective title search is possible. .

1 is a flowchart illustrating a process of automatically chapter marking according to the present invention.

2 is a block diagram exemplarily illustrating a schematic structure of a digital recorder capable of performing an automatic chapter marking function according to the present invention.

3 shows a data format according to the DVD recording standard defined in the DVD forum.

※ Explanation of code about main part of drawing ※

10 ..... TUNER 20 ..... Voice Signal Processing IC

30 ..... Processor 32 ..... Encoder

34 ..... control section 36 ..... buffer

40 ..... Recorder

Claims (9)

In the method of receiving a broadcast signal, automatically encoding the received broadcast signal to the DVD standard in the chapter of storing the chapter in the recording method, Extracting voice information from the received broadcast signal and outputting type information of the broadcast signal; Comparing the previously outputted and stored broadcast signal type information with the currently outputted broadcast signal type information; If it is determined that the type of the broadcast signal is changed, storing the current broadcast signal type information in a buffer and marking a chapter at a position of the broadcast signal whose type of broadcast signal has been changed; And An automatic chapter marking method of a digital recorder using audio information of a broadcast signal, comprising the step of recording the encoded broadcast signal on a recording medium. The method of claim 1, And the type information of the broadcast signal is obtained by examining a frequency band in which a pilot signal included in the broadcast signal is located. The method according to claim 1 or 2, And the type of the voice information is one of stereo voice, mono voice, or voice multiplexing. The method according to claim 1 or 2, The above step of marking a chapter at a position of a broadcast signal whose type of broadcast signal has been changed is performed by setting the video cell entry point information in the program chain information to a specific value defined by the DVD standard at the moment when the broadcast signal type information is changed. Automatic chapter marking method of a digital recorder, characterized in that. A receiver for receiving a broadcast signal; A voice signal processor extracting voice information from the received broadcast signal to determine a type of the broadcast signal, and having a first output for outputting the received broadcast signal and a second output for outputting broadcast signal type information; The broadcast signal and the broadcast signal type information are respectively received from the voice signal processor, and the analog broadcast signal is encoded into the DVD standard. When the input broadcast signal type is changed, the broadcast signal type is changed to the broadcast signal position. A processor for marking chapters; And And a recording apparatus for recording a broadcast signal encoded in the DVD standard on a recording medium. The method of claim 5, And the type of the broadcast signal is determined by examining a frequency band in which a pilot signal included in the broadcast signal is located. The method according to claim 5 or 6, And the type of voice information is one of stereo voice, mono voice, or voice multiplexing. The method of claim 5, The processor is: A first input for receiving an analog broadcast signal; A second input for receiving broadcast signal type information; An encoder for encoding the received analog broadcast signal into a DVD standard; A buffer for storing the received broadcast signal type information; And By comparing the previously stored broadcast signal type information with the currently received broadcast signal type information, if the result of the comparison indicates that the type of the broadcast signal is changed, the currently received broadcast signal type information is stored in the buffer, and the type of the broadcast signal is changed. And a controller for controlling the encoder to mark the chapter at the position of the broadcast signal. The method according to claim 5 or 8, The operation of marking the chapter at the position of the broadcast signal in which the type of the broadcast signal is changed by the processor may be performed by setting the video cell entry point information in the program chain information to a specific value defined by the DVD standard at the moment when the broadcast signal type information is changed. Digital recorder, characterized in that performed.