JP5277582B2 - Broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a matter that completion of CM cannot be notified in real time to a user who is receiving a broadcast wave and viewing/listening the broadcast because it takes time after completion of CM before completion of CM is detected. <P>SOLUTION: When the starting point and the endpoint of a CM is detected by receiving a broadcast wave accompanied by a caption signal, the starting point of a CM is detected based on the sound signal or the video signal of the broadcast wave, but the endpoint of a CM is not only detected based on the sound signal or the video signal of the broadcast wave but also a judgment is made that the CM has ended upon receiving the caption signal of the broadcast wave. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a broadcast receiving apparatus that detects a CM included in a broadcast signal.

In many cases, television broadcasts and radio broadcasts are broadcast with a CM (commercial message) sandwiched between programs or between programs. However, the CM is often not necessary information for the user. Therefore, a CM detection device that detects a section in which a CM is broadcast has been proposed (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 3-184484

  In the CM detection device described in Patent Document 1, if the interval between the silent part of the broadcast data and the next silent part is 15 seconds or 30 seconds, the section is determined as CM. This utilizes the fact that there is a silence of about 0.5 to 2 seconds at the beginning and end of most CMs, and that the number of seconds of CMs is often 15 or 30 seconds.

  FIG. 7 shows CM detection processing in the CM detection apparatus, and shows a case where 15 seconds of CM1 and CM2 and 30 seconds of CM3 and CM4 are broadcast between the main part. There is a silent part between each CM and between the CM and the main part. The CM detection device determines whether or not there is silence 15 seconds after detecting silence. For example, in CM1 or CM2, since no sound is detected after 15 seconds from the detection of silence, it is determined that the 15-second CM has ended. In CM3 or CM4, since there is no silence after 15 seconds from the detection of silence, it is estimated that the CM is 15 seconds or longer, and it is determined whether or not there is silence after 15 seconds. In the case of CM3 or CM4, since there is no sound after 30 seconds from the detection of silence, it is determined that the 30-second CM has ended. However, in such a method, it can be determined whether or not the CM or the main part started after silence is 15 × N seconds after silence detection (N is a predetermined number set in advance). Therefore, after the transition from CM to the main part, it cannot be determined that the main part is being broadcast unless 15 × N seconds have elapsed. For example, when detecting a 15-second CM and a 30-second CM, as shown in FIG. 7, the end of the CM section can be detected after 30 seconds have elapsed from the start of the main part. .

  As described above, since the CM detection process described in Patent Document 1 cannot detect a CM section in real time, it is effective when real-time performance is required, such as when the end of a CM section being broadcast is notified. There is a problem that is not. Accordingly, an object of the present invention is to provide a broadcast receiving apparatus that can detect the CM end timing early.

In order to achieve the above object, a broadcast receiving apparatus of the present invention includes a receiving unit that receives a broadcast wave, a separating unit that separates an audio signal, a video signal, and a caption signal from the received broadcast wave, CM start point detecting means for detecting the CM start point based on the silence part, and receiving a state in which the interval between the silence part and the silence part of the audio signal is not a predetermined time or the subtitle signal after detecting the CM start point CM end point detecting means for determining that the CM has ended when one of the two states is satisfied, and the interval between the silent portion and the silent portion of the audio signal is not a predetermined time, and the silent search time is predetermined. And a voice control unit that executes the silence search process again when the time is less than the time .

  According to the broadcast receiving apparatus of the present invention, the CM end timing can be detected early.

  Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a device that receives and outputs a digital television broadcast will be described as an example of the broadcast receiving apparatus of the present invention.

  FIG. 1 is a block diagram illustrating a configuration of a broadcast receiving apparatus 1 that receives a digital television broadcast according to the present embodiment. The broadcast receiving device 1 includes a control unit 10 that controls the broadcast receiving device 1. The control unit 10 includes a broadcast receiving unit 20, a storage unit 30, a time measuring unit 40, a display unit 50, an audio output unit 60, An operation unit 70 is connected. The broadcast receiving unit 20 processes broadcast waves received by the antenna. This process will be described later. The storage unit 30 stores data such as a channel list and software. The timer 40 measures the current time. The display unit 50 displays the video signal output from the broadcast receiving unit 20 and the data stored in the storage unit 30. The audio output unit 60 outputs an audio signal output from the broadcast receiving unit 20 and audio data stored in the storage unit 30. The operation unit 70 receives an operation from the user.

  FIG. 2 is a block diagram showing the internal configuration of the broadcast receiving unit 20 in detail. The tuner unit 21 receives the broadcast wave selected by the channel, performs AD conversion, demodulation, error correction, and outputs it to the DEMUX unit 22. The DEMUX unit 22 performs processing for separating the signal input from the tuner unit 21 into an audio signal, a video signal, and a caption signal. The separated audio signal is decoded by the audio control unit 23 and input to the audio output unit 60 and the CM detection unit 26. The video signal and the caption signal are decoded by the video control unit 24 and the caption control unit 25, respectively, and input to the display unit 50 and the CM detection unit 26. The CM detection unit 26 determines the start point and end point of the CM based on the input video signal and subtitle signal, and indicates at least information on the CM end point or that the CM has ended based on the determination result. A CM detection result including information is output to the control unit 10. Based on the CM detection result input from the CM detection unit 26, the control unit 10 may perform control for displaying characters and images on the display unit 50 and control for outputting sound to the audio output unit 60. it can.

  Next, with reference to the flowcharts of FIGS. 3 and 4, a process in which the CM detection unit 26 determines a CM start point and a CM end point will be described.

  The CM detection unit 26 registers the time point when the sound signal decoded by the sound control unit 23 becomes silent as the CM start point in the storage unit 30 (S101). The registration of the CM start point may store the CM start time or may be an elapsed time from a predetermined time such as the start of a program. Note that the detection of the CM start point is not only judged by silence, but also does not receive the caption signal character data in the CM section, so whether or not the caption signal character data is received is added to the judgment material. Also good. If silence is detected next after registering the CM start point in this way (Yes in S102), the silence detection time at this time is stored in the storage unit 30 (S103). If the elapsed time from the previous silent detection time is the number of seconds expressed as a multiple of 15 (hereinafter referred to as 15 × N seconds) (Yes in S104), the boundary between CMs or CMs or the CM and main part Judge as a boundary. In step S104, it is determined whether or not the elapsed time from the previous silent time is 15 × N seconds, but it may be determined based on whether or not the elapsed time from the CM start point is 15 × N seconds. Further, an error of a predetermined time (for example, within 1 second) may be allowed even if it does not coincide with 15 × N seconds.

  When it is determined Yes in step S104, it cannot be determined whether the boundary is between the CM and the CM or between the CM and the main part. Therefore, this boundary is provisionally registered as the CM end point (S105). The temporarily registered CM end point may store data similar to the silence time stored in step S103, or a flag indicating that the silence detection time stored in step S103 may be a CM end point. May be stored. After temporarily registering the CM end point in this way, the next silence is searched for, and if silence is detected and the interval from the previous silence (or interval from the CM start point) is 15 × N seconds (Yes in S104) ) And temporarily register a new silent point as the CM end point (S105).

  Note that silence may be detected during the CM. Therefore, if the interval between the silence and the silence does not match 15 × N seconds (No in S104), if this silence search time is less than the predetermined time (No in S106), the silence search processing from Step S102 is performed. Try again. For example, the predetermined time is set to a number of seconds (for example, 45 seconds) that covers the length of most CMs. When the silence search process is re-executed, in step S104, not only the elapsed time from the previous silence but also the elapsed time from the previous silence is measured. Thus, even if silence is detected during the CM, the CM end point can be acquired.

  If the interval between the silent part and the silent part does not coincide with 15 × N seconds and the silent search time is equal to or longer than a predetermined time, it is determined that the CM has ended, and the CM detection result is output. This CM detection result may be, for example, information indicating that the CM has ended or information indicating the start time and end time of the CM.

  Note that a scene change of the video signal may be used instead of using the silence of the audio signal. When using a scene change of the video signal, the video signal decoded by the video control unit 24 is input to the CM detection unit 26, the timing of the scene change is detected, and the scene change that occurs every 15 × N seconds is detected in the CM. It is used to determine the start point and CM end point.

  Further, in addition to the processing of the flowchart shown in FIG. 3, it is determined from the caption signal that the CM has ended by the processing shown in FIG. This subtitle signal is a signal including a character string displayed on the display unit 50 as a subtitle. When a caption signal is detected (S151), it is determined whether or not the CM start point is registered and the corresponding CM end point is not registered (S152). When the CM start point is registered and the corresponding CM end point is not registered, the CM detection unit 26 determines that the signal currently being processed is a signal in the CM. Indicates. However, the caption signal is not given to the CM. Therefore, when the subtitle signal is detected, if the CM start point has been registered and the CM end point has not been registered (Yes in S152), it is determined that the CM has ended, and the CM detection result is output (S153). ). As a result, it is possible to detect that the main part has been entered immediately upon reception of the caption signal.

  As described above, the CM start point and the CM end point can be detected using the silence of the audio signal and the caption signal. As shown in FIG. 5, by using the caption signal, the CM end point is detected earlier than the case where the CM is detected only by the silence shown in FIG. 7 as compared with the case where only the silence of the audio signal is used.

  By detecting the CM end timing early as described above, it is possible to detect not only a CM for a recorded signal but also a CM for a signal being broadcast. Accordingly, the control unit 10 to which the CM detection result is input from the CM detection unit 26 determines whether the signal being broadcast is not a CM, and displays the sound on the display unit 50 or the sound output unit 60. The output can be performed to notify the user that the CM has ended. Furthermore, the control unit 10 can execute other application software during the CM period, for example, and can notify the user when shifting from the CM to the main part.

  The application software to be executed is started by receiving a predetermined operation by the operation unit 70 during reception of the broadcast wave. Alternatively, predetermined application software may be automatically executed when the CM start point is registered. While the application software is being executed, the broadcast video signal output and audio signal output may be interrupted. If the application software to be executed does not involve an audio signal, the broadcast audio signal is output and the application software is output. If the software is accompanied by an audio signal, it may be controlled not to output the audio signal.

  FIG. 6 is a diagram for explaining user notification by screen display as an example of user notification when application software is executed during CM and the program shifts from the CM to the main part. In FIG. 6, description will be made using an example in which an application for creating a document is executed in the CM.

  As a user notification of the end of CM, the control unit 10 controls the display unit 50 to display as shown in FIG. As for the display, character data and images for CM end notification may be displayed on the forefront of the work screen as shown in FIG. 6A, or an application software screen is displayed as shown in FIG. 6B. You may display the character data and image for CM end notification in spaces other than a space. In FIG. 6B, an icon is displayed at the top of the display space. When performing user notification by display, both character data and images may be displayed as shown in FIG. 6A, or only characters or images may be displayed.

  In addition, the user notification is not limited to the screen display, but may be a notification sound output from the audio output unit. If there is a lamp such as an LED, it may be a notification by turning on the lamp. good. Or you may combine these alerting | reporting means. Furthermore, it may be switched to automatically output a broadcast video signal and audio signal when the end of CM is detected.

  By adopting the configuration of such an embodiment, the end of CM can be detected early.

  In addition, it is not limited to the said embodiment, You may change suitably in the range which does not deviate from the summary of this invention.

The block diagram of the broadcast receiver which concerns on embodiment of this invention. The figure for demonstrating the function of the broadcast receiving part of the broadcast receiving apparatus which concerns on embodiment of this invention. The flowchart which shows the process which the broadcast receiver which concerns on embodiment of this invention detects the start point and end point of CM by the soundless part of a broadcast audio | voice signal. The flowchart which shows the process which the broadcast receiving apparatus which concerns on embodiment of this invention detects the end point of CM by a caption signal. The figure which showed the example of the timing which the broadcast receiver which concerns on embodiment of this invention detects the end point of CM. The figure which showed the example of the screen display which the broadcast receiver which concerns on embodiment of this invention displays in order to alert | report the completion | finish of CM. The figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Broadcast receiving apparatus, 10 Control part, 20 Broadcast receiving part, 30 Storage part, 40 Timing part, 50 Display part, 60 Audio | voice output part, 70 Operation part, 21 Tuner part, 22 DEMUX part, 23 Audio | voice control part, 24 image | video Control unit, 25 subtitle control unit, 26 CM detection unit

Claims (4)

Receiving means for receiving broadcast waves;
Separating means for separating the audio signal, the video signal, and the caption signal from the received broadcast wave;
CM start point detecting means for detecting a CM start point based on a silent portion of the audio signal;
After the CM start point is detected, it is determined that the CM has ended when the interval between the silent portion and the silent portion of the audio signal is not a predetermined time or when the subtitle signal is received. CM end point detection means ;
A broadcast control, comprising: a voice control unit that re-executes a silence search process when the interval between the silent part and the silent part of the voice signal is not a predetermined time and the silent search time is less than the predetermined time. apparatus. Receiving means for receiving broadcast waves;
Separating means for separating the audio signal, the video signal, and the caption signal from the received broadcast wave;
CM start point detecting means for detecting a CM start point based on a scene change of the video signal;
After the CM start point is detected, it is determined that the CM has ended when either the scene change interval between the video signals is not a predetermined time or the subtitle signal is received. CM end point detection means ;
And a control unit that re-executes a scene change search process when the interval between scene changes of the video signal is not a predetermined time and the scene change search time is less than a predetermined time. Receiver device.   The broadcast according to claim 1 or 2, further comprising CM end notification means for notifying the user that the CM has ended when the CM end point detection means detects that the CM has ended. Receiver device. Display means for outputting the video signal separated by the separation means;
If the display means is displaying other than the video signal when it is detected by the CM end point detection means that the CM has ended, a display for switching the output of the display means to display the video signal The broadcast receiving apparatus according to claim 1, further comprising a switching unit.

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