JP4760962B2 - Video / audio recording and playback device - Google Patents

Description

  The present invention relates to an apparatus for recording and reproducing video and audio signals such as television broadcasting.

  Television broadcasts can be broadly classified into “main program broadcast” and “commercial message broadcast”. The main program broadcast is video / audio data of the content of a movie if it is a movie program. On the other hand, in commercial message broadcasting, a client, such as an advertiser or an advertising agency, contracts with a broadcasting station to broadcast video / audio data provided by the client during the main program broadcast. In some cases, broadcasters broadcast their advertisements. A commercial message is generally abbreviated as CM, and will be abbreviated as CM in this article. In many cases, the relationship between the main program broadcast and the CM broadcast is sparse, and for viewers who want to concentrate on viewing the main program broadcast, only the main program broadcast is available when recording or viewing the television broadcast. Is desired to be recorded, or the CM broadcast is skipped and only the main program broadcast is continuously viewed. On the other hand, in recent years, there are many commercials that are technically sophisticated using the latest video technology and high artistic and original content, and there is a demand for watching only commercials. In order to satisfy these demands, a technique for automatically identifying the main program broadcast and the CM broadcast with high accuracy is required.

  As a method for specifying a CM broadcast section, there is a method in which a silent part that occurs at the boundary between the main program broadcast and the CM broadcast is detected, and the CM broadcast section is specified from the appearance interval of the silent part (for example, Patent Documents). 1).

JP 2003-47031 A (page 5-8, FIG. 1)

  However, in this method, a part other than the CM, that is, a silent part may be detected in the main part at the same time interval as the time peculiar to the CM broadcast, and many false detections may occur.

  An object of the present invention is to detect a CM broadcast section with high accuracy while minimizing the erroneous detection of the main part even if CM broadcasts of various lengths are included.

  Traditionally, most CM broadcasts in Japan have a length of 15 seconds, 30 seconds or 60 seconds. However, there are many cases where long commercials such as 90 seconds, 120 seconds, and 180 seconds are broadcast.

  When trying to detect all CM broadcast sections including such a long CM, the conventional 15 seconds, 30 seconds, and 60 seconds are used as the occurrence intervals of change points that appear at the boundaries of CM broadcasts, such as silent parts. In addition to such intervals, it is necessary to set CM broadcast detection conditions for preparing more time interval candidates such as 90 seconds, 120 seconds, and 180 seconds, and to identify CM broadcast sections.

  However, increasing the number of change point time interval candidates for determining the CM section increases the number of cases in which the change point is detected at the same time interval as the CM section during the main part, and also increases the number of false detections in the main part of the program. There is a problem of end.

The present invention has been made to solve the above-described problems, and is a video / audio recording apparatus for recording a video signal and an audio signal of a television broadcast on a recording medium,
Multiple types of tuner means for receiving television broadcasts;
Change point detecting means for detecting a change point from the video and audio signal of the television broadcast;
It is determined whether or not the change point detected by the change point detection means is generated within a range obtained by adding a predetermined error to a predetermined time interval candidate, and a section sandwiched by the change point is identified as a CM broadcast section. CM broadcast section detection means;
Time interval candidate selection means for increasing or decreasing the predetermined time interval candidates according to the type of the tuner means;
Information recording means for recording time information representing the CM broadcast section identified by the CM broadcast section detection means on a recording medium.

  According to the present invention, by changing the length type of the CM broadcast section candidate to be detected depending on the type of the tuner receiving the television broadcast, the CM broadcast detection process suitable for the characteristics of the CM broadcast configuration for each tuner is performed. There is an effect that the CM broadcast section can be detected with high accuracy while preventing the erroneous detection of the unnecessary program main part.

1 is a block diagram showing a video / audio recording / reproducing apparatus according to Embodiment 1; FIG. FIG. 4 is a flowchart showing the operation of the video / audio recording / reproducing apparatus of the first embodiment. It is a table | surface which shows the frequency | count of broadcasting according to the length of CM broadcast in terrestrial digital broadcasting. It is a table | surface which shows the frequency | count of the broadcast according to the length of CM broadcast in BS digital broadcast. It is a figure which shows CM broadcast structure in terrestrial digital broadcasting and BS digital broadcasting. FIG. 4 is a block diagram showing a video / audio recording / reproducing apparatus according to Embodiments 2 and 3.

Embodiment 1 FIG.
FIG. 1 is a block diagram schematically showing the configuration of a video / audio recording / reproducing apparatus 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, a video / audio recording / reproducing apparatus 100 receives a terrestrial digital tuner 2 and a BS digital tuner 3 as tuners for selecting a broadcast program to be recorded from a broadcast wave received by an antenna 1. A tuner selection unit 4 for selecting a tuner, a hard disk drive (HDD) 5 for recording a video / audio signal obtained from each tuner, and a change check for detecting a change point at a CM boundary from the video / audio signal obtained from each tuner. It is used when the CM broadcast section detecting unit 7 detects the CM broadcast section from the output unit 6, the CM broadcast section detecting unit 7 that detects the CM broadcast section from the change point occurrence interval detected by the change point detecting unit 6, and the CM broadcast section detecting unit 7. And a time interval candidate selection unit 8 that stores predetermined time interval candidates for each tuner.

  In FIG. 1, only the antenna 1 is shown as an antenna, but a plurality of antennas may be connected for each tuner. In FIG. 1, the HDD 5 is shown as the recording means, but the recording means may be an optical disk such as a DVD or Blu-ray disk, or a silicon drive composed of a semiconductor memory such as a flash memory. The video / audio recording / reproducing apparatus 100 is not limited to a home video recorder but may be a personal computer or the like.

  Hereinafter, an operation for detecting a CM broadcast section of a recorded program in parallel with a television broadcast recording operation using the video / audio recording / reproducing apparatus 100 will be described with reference to a flowchart of FIG. The terrestrial digital tuner 2 or BS digital as a tuner that can receive the program to be recorded by the tuner selection unit 4 when the user manually gives a recording instruction with a recording start button or the like, or when the recording start time preset by the recording reservation is reached. The tuner 3 is selected (ST1), and the channel designated for recording is selected (ST2). When the broadcast wave is correctly received, the video / audio signal of the reception channel is output as a stream from the tuner (ST3), and is recorded in the HDD 5 (ST4). When the user manually issues a stop instruction with a recording stop button or the like, or when the recording end time set in advance by the recording reservation is reached, the recording operation ends (ST5). The received stream is sequentially recorded on the HDD 5 until the end of recording.

  Note that information other than video / audio signals, for example, caption information and data broadcast signals may be obtained from the digital tuner, and these may also be recorded in the HDD 5 together. Further, a signal encoded and compressed by MPEG2 or the like obtained from a digital tuner is converted into an H.264 signal by a decoding / encoding circuit. It may be re-encoded and compressed using a method such as H.264 and recorded in the HDD 5.

ST1 to ST5 indicate the basic operation of recording, while ST6 to ST14 are operations for detecting the CM broadcast section. First, when a tuner capable of receiving a program to be recorded is selected by the tuner selection unit 4 in ST1, whether the terrestrial digital tuner 2 or the BS digital tuner 3 is selected from the tuner selection unit 4 to the time interval candidate selection unit 8 Is sent, and the tuner type is determined (ST6).
Here, the result of examining the distribution of the CM broadcast composition according to the type of tuner, that is, the broadcast wave is shown. FIG. 3 shows a distribution of CM broadcasts in 19 terrestrial digital broadcasts. Thus, for all 602 CM broadcasts, 15 second CMs account for less than 80%, 478, and 15 seconds and 30 second CMs together account for over 99% of the total. This result can be regarded as equivalent to the distribution of traditional CM broadcasting in Japan.

  On the other hand, recent televisions and Blu-ray recorders are often equipped with a plurality of digital tuners, that is, tuners that can receive different broadcast waves such as terrestrial digital broadcast and BS digital broadcast. Among these, the distribution of the CM broadcast in the BS digital broadcast is different from the terrestrial digital broadcast described above. FIG. 4 shows the distribution of CM broadcasts in 8 BS digital broadcast programs. It was found that for all 82 CM broadcasts, the total of 15 seconds and 30 seconds was less than 75% of the total, and there were relatively many long commercials such as 60 seconds, 90 seconds, and 120 seconds.

  FIG. 5 shows the composition ratio of the terrestrial digital broadcast and the BS digital broadcast for each CM broadcast time. Thus, BS digital broadcasting is characterized in that each CM is longer than terrestrial digital broadcasting.

  This time, terrestrial digital broadcasting and BS digital broadcasting were compared. For example, in overseas broadcasting, in addition to lengths such as 15 seconds and 30 seconds, lengths that are not common in Japan such as 25 seconds and 27 seconds. May be broadcast.

  Thus, when it is known in advance that the distribution of the CM broadcast configuration varies depending on the type of broadcast wave that can be received by the tuner, CM detection processing suitable for each tuner can be performed.

  In response to the determination result in ST1, for example, when the tuner is a BS digital broadcast, as shown above, since many long CMs are broadcast in the broadcast, 15 seconds, 30 seconds, 60 seconds, 90 seconds, Six candidates of 120 seconds and 180 seconds are selected and set as candidates for a predetermined time interval used in the CM broadcast section detector 7 described later (ST8). On the other hand, if it is a tuner other than BS digital broadcasting such as terrestrial digital broadcasting, it is known in advance that long CMs are not broadcast so much, so three candidates of 15 seconds, 30 seconds, and 60 seconds will be described later. It is selected and set as a predetermined time interval candidate used in the CM broadcast section detection unit 7 (ST7). These operations may be performed immediately after the start of recording, or may be performed before the start of recording when the broadcast wave of the recording target program is known in advance by recording reservation or the like.

  During the recording operation, the video / audio stream received in ST3 is sequentially analyzed by the change point detector 6 (ST9). At this time, for example, a buffer memory for temporarily storing the video / audio stream may be prepared for the change point detection process, or the video on the buffer memory may be used by using the buffer memory in the previous stage of recording the video / audio stream in the HDD 5. The change point may be detected by analyzing the audio stream.

  The change point detection unit 6 detects a change point for specifying a CM broadcast section by analyzing the video / audio signal. As a change point for specifying the CM broadcast section, there are, for example, a scene change occurrence place and a non-voice section. In many cases, there is no content connection between the main program broadcast and the CM broadcast during the television broadcast, and the video is switched at the boundary, and a scene change is likely to occur. Similarly, a scene change occurs between CM broadcasts. In general, silent sections are inserted before and after the CM broadcast.

  Here, a method for detecting a silent section will be described. In general, digital broadcast audio signals in Japan are distributed as a stream encoded and compressed by the AAC method. By decoding this AAC audio stream, PCM audio data is obtained in which the amplitude of each data value represents the size of the sound. Therefore, the volume of the sound can be obtained by dividing the PCM sound data in a certain unit of time and obtaining the sum of the amplitude values of the PCM sound data within that time. Since the length of the silent section before and after the CM broadcast is about several hundred milliseconds, the sum of the amplitude values of the PCM voice data is obtained in a time unit (for example, 32 ms) in which this can be detected, and the section where this value falls below a certain threshold value Is detected as a silent section.

  In addition to the method described above, the voice signal is subjected to FFT or the like to convert from the time domain to the frequency domain, energy is calculated from the spectrum information, and a section where the energy falls below a certain threshold is a silent section You may detect as. In addition, since the AAC method is frequency-encoded, frequency domain information may be directly acquired by decoding up to the encoded MDCT coefficient value.

  Note that the change point detected by the change point detection unit 6 is not a single change point of a video or audio signal such as a scene change or a silent section, but may be a place where a scene change and a silent section occur simultaneously. Scene changes and non-speech sections can occur frequently even during the main program broadcast alone, and the detection accuracy of the CM broadcast section can be improved by using the places where these occur simultaneously as change points.

  When the change point is detected by the change point detection unit 6, the occurrence time information is sent to the CM broadcast section detection unit 7. The occurrence time of the change point is preferably determined by using a PTS (PresentationTimeStamp) attached to the video / audio stream.

  The CM broadcast section detection unit 7 determines whether the change point detected by the change point detection unit 6 occurs within a range obtained by adding a predetermined error to a predetermined time interval candidate (ST10). It is identified whether the section sandwiched by points is a CM broadcast section (ST12) or not (ST11). Here, the predetermined error is a value of about ± several tens to hundreds of milliseconds.

  The candidate for the predetermined time interval used when the CM broadcast section detecting unit 7 detects the CM broadcast section is selected and set in advance by ST6 to ST8 in the time interval candidate selecting unit 8. The set of time interval candidates used for section identification is increased or decreased.

  Furthermore, the CM broadcast section detecting unit 7 identifies a CM broadcast section only when three or more change points that are continuous in time occur within a predetermined time interval plus a predetermined error (ST14). There are conditions. This is intended to improve CM detection accuracy by utilizing the fact that a plurality of CMs are often broadcast continuously in CM broadcasting. The case where there are three change points will be described in detail. When time-sequential change points are A, B, and C, a pair of AB and BC both have a predetermined error at a predetermined time interval. Only when it is detected within the range to which is added, it is identified as a CM broadcast section.

  However, in the case of a long CM such as 120 seconds or 180 seconds, there is a case where only a single CM immediately switches to the main program and a plurality of CMs are not broadcast continuously. In order to deal with such a case, the identification condition of the CM broadcast section is changed according to the time interval of the change point. For example, for the change points that occur within a range of 15 seconds, 30 seconds, 60 seconds, and 90 seconds plus a predetermined error, as described above, the three change points occur continuously at the predetermined intervals. In the case of a change point that is identified as a CM broadcast section only at a time interval of 120 seconds or more, only two change points are generated within a predetermined time interval plus a predetermined error. Is identified as a CM broadcast section (ST13).

  Various other conditions may be added to the CM broadcast section detection condition of the CM broadcast section detection unit 7. For example, the silent section at the CM boundary is generally 600 milliseconds to 2000 milliseconds, and therefore, if the detected length of the silent section is outside this range, the silent section is regarded as the CM boundary. By not having it, it is possible to prevent erroneous detection.

  In addition, although a method for selecting candidates for a predetermined time interval used in the CM broadcast section detection unit 7 according to the tuner type has been described here, time interval candidates are selected depending on the time zone for recording, that is, the time zone during which the program is broadcast. It may be selected. Programs that are broadcast from 19:00 to 22:00, generally called Golden Time, have many sponsor companies, and CM broadcasts are often short, such as 15 or 30 seconds. On the other hand, in the early morning and daytime hours, a long CM of 90 seconds or more is often broadcast even by terrestrial digital broadcasting. To cope with this, the probability of false detection can be further reduced by determining whether or not to detect a long CM depending on the recording time zone of the program.

  For the section identified as the CM broadcast section by the CM broadcast section detector 7, the time information of the section sandwiched between the change points is recorded in the HDD 5 as the time information of the CM broadcast section (ST4). By referring to the CM broadcast section time information recorded in the HDD 5 during playback of the recorded program simultaneously recorded, it is possible to realize CM skip playback and the like.

  In the first embodiment, by selecting the time interval for detecting the CM broadcast section based on the characteristics of the CM broadcast configuration for each tuner, and further changing the identification condition of the CM broadcast section according to the change point occurrence interval, There is an advantage that the CM broadcast section can be detected with high accuracy at all times while suppressing erroneous detection in the main part.

  In addition, since the CM detection rule is changed on a tuner basis, the present invention can be used even in a device that does not have an electronic program guide (EPG) function capable of acquiring genre information of a recorded program.

  In the present embodiment, an apparatus having two digital tuners, the terrestrial digital tuner 2 and the BS digital tuner 3, has been described. However, the number of tuners is not limited to two, and a CS digital tuner, etc. The same effect can be obtained even when provided.

  In the present embodiment, the case where the CM broadcast section is detected simultaneously when the video / audio stream is recorded on the HDD or the like has been described. However, the CM broadcast section is detected after the video / audio stream is recorded on the HDD or the like, and the detection result is detected. May be recorded in the HDD or the like in association with the already recorded video / audio stream. The detection result does not necessarily have to be recorded in an HDD or the like in which a video / audio stream is recorded, and may be recorded in another recording medium such as a flash memory as long as data is associated.

  Furthermore, in a device such as a PC that is capable of high-speed data processing and has sufficient memory for data processing, it is possible to detect CM broadcast sections in real time during playback and perform playback with the CM removed. is there. For example, a video / audio stream for several minutes preceding the video / audio stream to be reproduced is stored in a memory in advance, and the stored video / audio stream is subjected to the processing from ST6 to ST14 in FIG. And the detection result is reflected in the reproduction.

Embodiment 2. FIG.
In the second embodiment, in addition to the type of tuner that receives a television broadcast, the type of CM broadcast that is to be detected using the genre information of the program is changed, so that an error in the main program that is unnecessary can be more appropriately detected. The CM broadcast section is detected with high accuracy while preventing detection.

  Depending on the genre of the program, each corner in the program may be configured with the same length as the CM broadcast. In such a program, the main program may be erroneously detected as a CM broadcast.

  This is especially true for anime programs. It is rare for anime programs to broadcast long commercials such as 90 seconds, 120 seconds, and 180 seconds even in BS digital broadcasting. In addition, in an anime program, an opening theme and an ending theme are usually broadcast at the beginning and end of the program, but these scenes are often composed of 90 seconds.

  Furthermore, animation programs are prone to silence in scenes where BGM is not flowing, etc., and the main part of the program is also prone to silence sections and scene changes similar to CM boundaries. Increasing the number of change point occurrence time interval candidates to be used easily increases the number of cases in which the main program is erroneously detected as a CM section.

  The invention according to the present embodiment is characterized in that, in addition to the type of tuner that receives a television broadcast, it is possible to appropriately detect a CM broadcast section for a program of a specific genre.

  FIG. 6 is a block diagram schematically showing the configuration of the video / audio recording / reproducing apparatus 200 according to the second embodiment of the present invention. As shown in FIG. 6, the video / audio recording / reproducing apparatus 200 receives the terrestrial digital tuner 2 and the BS digital tuner 3 as tuners for selecting a broadcast program to be recorded from the broadcast wave received by the antenna 1. A tuner selection unit 4 that selects a tuner, a hard disk drive (HDD) 5 that records video and audio signals obtained from each tuner, and a program that acquires electronic program guide (EPG) information of broadcast programs received by each tuner An attribute information acquisition unit 9, a change point detection unit 6 that detects a change point at the CM boundary from the video / audio signal obtained from each tuner, and a CM broadcast section from the occurrence interval of the change point detected by the change point detection unit 6 CM broadcast section detection unit 7 for detecting the CM broadcast section detection unit 7 and a predetermined time interval candidate used when the CM broadcast section detection unit 7 detects the CM broadcast section. Time stored by the tuner and a distance candidate selection unit 8.

  Hereinafter, an operation for detecting a CM broadcast section of a recorded program in parallel with the recording operation of the television broadcast using the video / audio recording / reproducing apparatus 200 will be described. In addition, about the operation | movement of each part, the same thing as what was demonstrated in Embodiment 1 abbreviate | omits description here.

  The program attribute information acquisition unit 9 acquires electronic program guide information of a broadcast program, and acquires genre information of a recorded program as program attribute information included in the electronic program guide information. The genre information includes large genre information and small genre information. For example, information indicating a program genre such as (drama-domestic drama) or (sports-baseball) can be acquired. A plurality of genre information may be given to one program.

  In the first embodiment, the candidate for the predetermined time interval used when the CM broadcast section detecting unit 7 detects the CM broadcast section can be changed according to the type of reception tuner of the recorded program. In addition, it is possible to change according to the genre information of the recorded program acquired by the program attribute information acquisition unit 9, and by using both information, the set of time interval candidates used by the time interval candidate selection unit 8 can be increased or decreased. .

  The operation of the time interval candidate selection unit 8 in the second embodiment is specifically shown below. For example, if the program being recorded is a terrestrial digital broadcast program, three candidates of 15 seconds, 30 seconds, and 60 seconds are selected as candidates for a predetermined time interval, and if the program is a BS digital broadcast program, 15 seconds, Six candidates of 30 seconds, 60 seconds, 90 seconds, 120 seconds, and 180 seconds are selected as candidates for a predetermined time interval. These time interval candidates are determined in advance based on the distribution of CM broadcasts for each tuner (average distribution including various genres).

  Next, it is determined whether or not the program genre information is an animation program. The genre information indicating an animation program is generally a case where a large genre is animation / special effects, or a large genre is a movie and a small genre is animation. When such genre information is given to a program, it is determined that the program is an animation program, and even when BS digital tuner 3 is selected as a tuner to receive, 15 seconds, 30 seconds, 60 seconds. Are selected as candidates for a predetermined time interval. This is because, by not selecting a long time interval of 90 seconds or longer as a candidate, the possibility of erroneously detecting a section sandwiched between silent sections appearing in an animation program as a CM section is reduced.

  When multiple pieces of genre information are assigned to the program (currently, there are cases where up to three genre information is assigned), for example, it is determined whether or not the program is an animation program by the following method. it can.

  For example, a music program that introduces nostalgic anime songs in a ranking format or the like may have two genre information of (animation / special effects-domestic animation) and (music-domestic rock / pop). In addition, documentary programs that feature animated film directors may be given two genre information: (animation / special effects-domestic animation) and (documentary / education-documentary in general). Since such a program is different from a so-called anime program, it is appropriate to determine that the program is not an anime program.

  Therefore, only when genre information indicating an animation program is added to the genre information, the program is determined as an animation program, and when other genre information exists, it is not determined as an animation program.

  In the second embodiment, in addition to the characteristics of the CM broadcast configuration for each tuner, by selecting the time interval for detecting the CM broadcast section based on the genre information of the program, it is always high while suppressing false detection in the main part. There is an advantage that the CM broadcast section can be detected with accuracy.

  In particular, the effects of the present invention can be expected when each corner is configured at the same time interval as the CM broadcast, such as an animation program, and when a change point similar to the CM boundary is easily detected in the main part of the program.

Embodiment 3 FIG.
As in the second embodiment, the third embodiment is more appropriate by changing the type of CM broadcast to be detected using the genre information of the program in addition to the type of tuner that receives the television broadcast. Thus, the CM broadcast section is detected with high accuracy while preventing erroneous detection of the main program which is unnecessary.

  FIG. 6 is a block diagram schematically showing the configuration of the video / audio recording / reproducing apparatus 200 according to the second embodiment of the present invention. Since the operation has been described in the second embodiment, the details are omitted.

  As shown in FIG. 5, there is a difference in the distribution of the length of CM broadcasts depending on the type of tuner, and even if a program is received by the same tuner, the length of the CM broadcast depends on the genre of the program. Distribution may be different. For example, in programs belonging to the genre of information / wide show, CMs of 90 seconds or more are often broadcast even with terrestrial digital broadcasting.

  In the time interval candidate selection unit 8 in the third embodiment, for example, even if the recorded program is a terrestrial digital broadcast program, it is 15 seconds if the program belongs to the genre of information / wide show. In addition to the three candidates of 30 seconds and 60 seconds, the other six candidates including 90 seconds, 120 seconds, and 180 seconds are selected as candidates for a predetermined time interval.

  In the third embodiment, in addition to the characteristics of the CM broadcast configuration for each tuner, the time interval for detecting the CM broadcast section is selected based on the genre information of the program, so that the CM broadcast section can be surely used as the CM broadcast section. If there is, there is an advantage that detection can be performed.

1 antenna, 2 terrestrial digital tuner, 3 BS digital tuner, 4 tuner selection unit, 5 hard disk drive, 6 change point detection unit, 7 CM broadcast section detection unit, 8 time interval candidate selection unit, 9 program attribute information acquisition unit, 100 video / audio recording / reproducing apparatus, 200 video / audio recording / reproducing apparatus

Claims (9)

Multiple types of tuner means for receiving television broadcasts;
Change point detecting means for detecting a change point from the video and audio signal of the television broadcast;
It is determined whether a time interval between the change point detected by the change point detection means and another change point already detected is equal to one or more predetermined time intervals, and a predetermined error is determined. CM broadcast section detecting means for setting a section sandwiched between the detected change point and the other detected change points when it is determined to be equal within a range as a CM broadcast section;
Time interval candidate selection means for predetermining the predetermined time interval for each tuner means;
An audio / video recording / reproducing apparatus comprising: information recording means for recording time information representing a CM broadcast section identified by the CM broadcast section detection means on a recording medium. Multiple types of tuner means for receiving television broadcasts;
A program attribute information acquisition unit for acquiring electronic program guide information including attribute information related to the television broadcast;
Change point detecting means for detecting a change point from the video and audio signal of the television broadcast;
It is determined whether a time interval between the change point detected by the change point detection means and another change point already detected is equal to one or more predetermined time intervals, and a predetermined error is determined. CM broadcast section detecting means for setting a section sandwiched between the detected change point and the other detected change points when it is determined to be equal within a range as a CM broadcast section;
Time interval candidate selection means for predetermining the predetermined time interval for each tuner means and for each attribute information acquired by the program attribute acquisition unit;
An audio / video recording / reproducing apparatus comprising: information recording means for recording time information representing a CM broadcast section identified by the CM broadcast section detection means on a recording medium.   3. The video / audio recording / reproducing apparatus according to claim 1, wherein the plurality of types of tuner means include a tuner for receiving terrestrial digital broadcasting and BS digital broadcasting.   4. The video / audio recording / reproducing apparatus according to claim 1, wherein the change point detection unit detects a silent section of an audio signal included in the television broadcast. 5.   5. The video / audio recording / reproducing apparatus according to claim 1, wherein the change point detection unit detects a scene change portion of a video signal included in the television broadcast. 6. The CM broadcast section detecting means determines whether or not n or more change points detected by the change point detecting means are generated within a range obtained by adding a predetermined error to a predetermined time interval candidate. , Identify the section between the change points as the CM broadcast section,
6. The video / audio recording / reproducing according to claim 1, wherein n is 3 when a candidate for a predetermined time interval is 90 seconds or less, and 2 when the candidate is 120 seconds or more. apparatus.   The video / audio according to any one of claims 1 to 6, wherein the predetermined time interval includes any one of 15 seconds, 30 seconds, 60 seconds, 90 seconds, 120 seconds, and 180 seconds. Recording / playback device.   The video / audio recording / reproducing apparatus according to claim 2, wherein the program attribute information acquisition unit acquires at least genre information of a program.   9. The video / audio recording / reproducing apparatus according to claim 2, wherein the time interval candidate selecting means includes means for determining whether the television broadcast is an animation program from the attribute information.

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