JP2001111964A - Broadcast signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast signal recording and reproducing device employing a time shift function by which a viewer can easily identify the time information not being a current time or an accurate current time. SOLUTION: The broadcast signal recording and reproducing device having provision for time difference viewing records a broadcast signal received to a recording medium, discriminates whether or not time information is included in a video image read from this recording medium, conducts mask processing for a time display part in the broadcast signal with a signal having nearly the same level as that of a luminance signal and a chrominance signal around the time display part of applies processing of inserting the current time to the masked part according to the result of discrimination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast signal recording / reproducing apparatus for recording / reproducing an analog broadcast or a digital broadcast program using a storage medium, which is compatible with time difference viewing.

[0002]

2. Description of the Related Art In recent years, digital signal processing techniques for video and audio have been remarkably advanced, and accordingly, analog broadcast signals have been digitized, or digital broadcast signals have been processed and recorded on storage media. Was.

[0003] Among these, one of the most important technologies is a video / audio compression technology.

[0004] Compression techniques include MPEG, JPEG, and H.264. 2
61 was the main place, but ISO / IEC13818
(Moving Picture Coding Experts Group (ISO / I
The method proposed in ECJTC1 / SC29 / WG11) is standardized worldwide for broadcasting, communication, and storage media.

[0005] ISO / IEC 13818 describes not only a video compression system but also a control part for multiplexing and broadcasting a bit stream compressed for each of video, audio and data of a program, and for receiving a specified program on a receiver side. Also defines the method. Similarly, in analog broadcasting as well, digitization of a signal at the time of recording, compression using the above-described MPEG compression technique, and recording have been actively performed. As shown in FIG. 7, the configuration is such that the video data of the program selected by the analog tuner 100 is digitized by the digital encoder 101 and the recording medium 102
To record. The recorded digital data is read by a viewer's operation, sent to the digital video decoder 103, and after being decoded, reaches the monitor 104.

[0006] After the stored digital signal is recorded on a storage medium, it is decoded as necessary and decoded into an analog signal.

In recent years, in a storage medium that can be accessed randomly, a function of reproducing recorded data after a certain period of time while continuing recording (hereinafter, referred to as a time shift function) has been realized. Although the time shift function is very convenient for the viewer, the viewing time can be easily changed, so that it may be difficult to accurately grasp the current time.

[0008] That is, it is difficult for a viewer to clearly indicate whether the signal being reproduced is a signal that is decoded and presented in real time or a signal that is time-shifted and delayed by a predetermined time. Very important.
However, there is a broadcast that is sent with the current time pasted to the video signal in advance, and when this signal is recorded and presented, the past time will be presented on the screen, Can be very confusing.

[0009]

As described above, in the prior art, in the case of time-lag viewing, the reproduced video catches up in real time due to commercial skip or the like.
Whether the time information reproduced and displayed on the monitor or the like indicates the current time or the time at the time of past recording cannot be easily identified to the viewer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem. In the case where a time shift function is used, time information other than the current time can be easily recognized by a broadcast signal recording system. It is an object to provide a playback device.

Another object of the present invention is to provide a broadcast signal recording / reproducing apparatus capable of presenting an accurate current time to a viewer.

[0012]

In order to achieve the above object, the present invention provides a broadcast signal recording / reproducing apparatus which supports time-lag viewing, which records a broadcast signal received on a recording medium,
In response to the signal read from the recording medium, it is determined whether or not time information is included in the video presented on the monitor screen. In addition, a process of masking with a signal having substantially the same level as a luminance signal and a chrominance signal around the time display is performed and sent to the monitor.

[0013] Further, the present time is masked into a masked portion and sent to the monitor.

If the time information is separately recorded as caption information rather than embedded in the video signal, the current time is presented without presenting the caption information.

According to the above arrangement, when the viewer uses the time shift function, the time shift function is executed by presenting the current time instead of presenting the recorded time information. This also makes it possible for the viewer not to mistake the current time. further,
When the time shift function catches up with real time viewing by commercial skip or the like, it is possible to easily know that the time shift function has been released by notifying that real time viewing has been started.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings, the same parts are denoted by the same reference numerals.

First, a system for digitizing and recording an analog broadcast signal will be described with reference to FIG.

A video signal obtained from the analog tuner 200 is sent to a digital video encoder 201 and digitized. The digitized data is recorded on a recording medium 202 and sent to a digital video decoder 203 by a viewer operation. At this time, when the time shift function is operated, the difference between the recording time and the read time is constant.

The digital data read from the recording medium 202 is sent to a digital video decoder 203. The digital data is converted into an analog signal by the digital video decoder 203 and sent to the time information determination circuit 204. The time information determination circuit 204 determines whether or not time information is included in the video reproduced (presented) on the screen of the monitor 208, and sends the result to the time information mask circuit 205. In the time information mask circuit 205, the time information determination circuit 2
Based on the information obtained from 04, digital video decoder 20
A process of masking the time display portion in the video signal obtained from step 3 with a signal having substantially the same level as the luminance signal and color signal around the time display is performed.

The time management circuit 206 manages the current time, and sends information about the current time to the time information insertion circuit 207. The time information insertion circuit 207 pastes the current time on the screen as necessary and sends it to the monitor 208.

Here, the time information discriminating circuit 204 can be configured, for example, as shown in FIG. In FIG. 2, an analog video signal is supplied to a level slice circuit 2001. In the level slice circuit 2001, a signal having a high luminance level such as time information is detected. The signal sliced by the level slice circuit 2001 is sent to the figure discrimination circuit 2003. This figure discriminating circuit 2003 discriminates a figure, and when it is determined that the information is time information, sends the result. Further, from the figure discriminating circuit 2003, information indicating in which area on the screen the time information is inserted is sent to the area specifying circuit 2002.

The area specifying circuit 2002 generates an area signal and sends it to the average signal generating circuit 2004. In the average signal creation circuit 2004, the time of the area in which the time information is inserted is obtained from the area signal obtained from the area specifying circuit 2002 and the low luminance signal component of the level slice signal obtained in the level slice circuit 2001. An average signal of a luminance signal and a chrominance signal of a portion other than the information is generated and transmitted.

The time information discrimination circuit 204 may change the color of the presented time information or blink the time information based on the detected luminance signal and color signal of the time information and output it to the monitor. In this case, the time information mask circuit 205 is bypassed.

Next, as a second embodiment, a system for recording a signal in which time information is attached to a video signal in digital broadcasting will be described with reference to FIG.

In FIG. 3, a video signal obtained from a digital tuner 300 is recorded on a recording medium 202 and transmitted to a digital video decoder 203 by a viewer's operation. At this time, if you are using the time shift function,
The difference between the recording time and the read time is constant.

The digital data read from the recording medium 202 is converted into an analog signal by a digital video decoder 203,
The time information is sent to the time information determination circuit 204. Time information determination circuit 204
Then, it is determined whether or not time information is included in the video reproduced (presented) on the screen of the monitor 208, and the result is sent to the time information mask circuit 205. The time information determination circuit 204 has a configuration as shown in FIG. 2 described in the above embodiment.

In the time information mask circuit 205, based on the information obtained from the time information discriminating circuit 204, the luminance signal around the time display is added to the time display portion in the video signal obtained from the digital video decoder 203. And a process of masking with a signal having substantially the same level as the color signal.

The time management circuit 206 manages the current time, and sends information about the current time to the time information insertion circuit 207. In this information insertion circuit 207, if necessary,
The current time is pasted on the scene and sent to the monitor 208.

The time management circuit 206 may include a clock as a system, or may be a circuit that manages the time based on time information transmitted by digital broadcasting. Next, as a third embodiment, in a digital broadcast, when time information is transmitted as subtitle information (time information based on text) signal different from a video signal, a system for recording the subtitle information is shown in FIG. This will be described with reference to FIG.

In FIG. 4, a video signal and caption information (textual time information) obtained from a digital tuner 300 are recorded on a recording medium 202 and transmitted to a digital video decoder 203 by a viewer operation. At this time,
When the time shift function is activated, the difference between the recording time and the read time is constant.

The digital data read from the recording medium 202 is sent to a digital video decoder 203. The digital data is converted into an analog signal by the digital video decoder 203. In the digital subtitle decoder 400, the subtitle signal obtained from the recording medium 202 is converted into an analog signal and transmitted to the time information insertion circuit 207.

When the time shift function is used, the digital tuner 300 does not use the subtitle information (text time information) read from the recording medium and is decoded by the digital subtitle decoder 400. Decoded subtitle information, or information obtained from a clock possessed by the system, or time information managed based on the currently transmitted time information is obtained from the time management circuit 206, and the information is obtained. Original time information insertion circuit 207
Is pasted on the screen and transmitted to the monitor 208.

On the other hand, when the time shift function is not used, the video signal and the subtitle information signal captured by the digital tuner 300 are sent directly to the digital video decoder 203 and the digital subtitle decoder 400, and the signals decoded together are output. Is inserted in the time information insertion circuit 207.

In the above description, when the time shift function is activated, the time information is replaced with the current time information and presented. However, the digital subtitle decoder 400 presents the recorded subtitle information. In such a case, the time information may be presented or blinked in a color determined by the system. When presenting the current time, the time information may be presented in another color.

Next, as a fourth embodiment, a system for recording subtitle information (time information based on text) in which time information is transmitted separately from a video signal in digital broadcasting will be described with reference to FIG. .

In FIG. 5, a video signal and subtitle information (time information based on text) obtained from a digital tuner 300 are recorded on a recording medium 202 and transmitted to a digital video decoder 203 by a viewer operation. At this time,
When the time shift function is activated, the difference between the recording time and the read time is constant, but the signal being decoded gradually approaches a real-time broadcast by an operation such as skipping a commercial.

This skip operation can be realized by a method of setting beforehand such that a specific video signal such as a commercial is not recorded at the time of recording the video signal, or a method of detecting at the time of reproduction.

The digital video decoder 203 converts the digital data read from the recording medium 202 into an analog signal.
The signal obtained from 2 is converted to analog and pasted on the screen. At this time, when using the time shift function,
The subtitle information (text time information) read from the recording medium is decoded by the digital subtitle decoder 400, and at the same time, the subtitle information sent from the digital tuner 300 is decoded and the time is detected. In this case, the fact that the time-shift reproduction is being performed is presented, and when the difference disappears, the viewer is informed that the real-time decoding is being performed.

Here, in order to make it easier for the viewer to understand that the switching from the time-shift (time difference) viewing to the real-time viewing is performed, the time display is blinked for a certain time, the color is changed for a certain time, and the screen is displayed in real time. This can be easily realized by adopting a method of displaying an event, providing an LED outside the screen, changing its color, notifying by sound, or the like.

In order to detect that the time difference has disappeared, the subtitle time data or time information read from the recording medium and the PCR, which is a reference signal for clock reproduction, is used.
A signal, a time stamp, and information obtained from a clock of the system, time information managed based on the currently transmitted time information, or a currently transmitted reference signal for clock recovery. It can be detected by comparing a certain PCR signal or a time stamp in the time management circuit 206.

Next, as a fifth embodiment, a system for adding time information information to a video signal and recording it in an analog broadcast will be described with reference to FIG.

When the video signal obtained from the analog tuner 200 is digitized by the digital video encoder 201, time information is added to the digital video signal and recorded on the recording medium 202. The digital video decoder 20 is operated by the viewer.
3 At this time, if the time shift function is activated, the difference between the recording time and the read time is constant, but the signal that is being decoded gradually approaches real-time broadcasting by an operation such as skipping commercials.

For example, this skip operation can be realized by setting in advance not to record a commercial depending on whether bilingual broadcasting is being performed at the time of recording a video signal.

In the digital video decoder 203, the digital data read from the recording medium 202 is converted into an analog signal, and simultaneously recorded time information is sent to the time information discriminating circuit 204. The time determined by the time information determination circuit 204 is compared with the time obtained from the time management circuit 206 included in the system by the time comparison circuit 600. If the result does not match, the time shift function is being performed. Is detected, and when they match, it is detected that real-time reception is being performed.

Here, in order to show the detected result to the viewer in an easy-to-understand manner, the time display is blinked for a certain time, the color is changed for a certain time, the real time is displayed on the screen, and an LED is displayed outside the screen. It can be easily realized by adopting a method of changing the color, notifying by sound, or the like.

[0046]

As described above, according to the present invention,
If your viewers use the timeshift feature,
Even if the time shift function is executed by presenting the current time instead of presenting the recorded time information, it is possible for the viewer not to mistake the current time. Furthermore, when the time shift function catches up with real-time viewing by commercial skip etc.,
By notifying that real-time viewing has started,
It is possible to know that the time shift function has been released.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a broadcast signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration when a time shift function is executed in a situation where time information is embedded in a video signal during digital broadcasting in the embodiment.

FIG. 3 is a block diagram showing a configuration at the time of executing a time shift function in a situation where time information is not embedded in a video signal during digital broadcasting in the embodiment.

FIG. 4 is a block diagram to which a configuration for automatically determining time information in a video presented on a monitor is added in the embodiment;

FIG. 5 is a block diagram of the embodiment, to which a configuration for detecting whether a time shift function is being performed at the time of receiving a digital broadcast is added.

FIG. 6 is a block diagram of the embodiment, to which a configuration for detecting whether a time shift function is being performed at the time of analog broadcast reception is added.

FIG. 7 is a block diagram showing a configuration of a conventional broadcast signal recording / reproducing apparatus when a time shift function is performed.

[Explanation of symbols]

200: analog tuner, 201: digital video encoder, 202: recording medium, 203: digital video decoder, 204: time information discriminating circuit, 205: time information mask circuit, 206: time management circuit, 207: time information inserting circuit,
8: monitor, 300: digital tuner, 400: digital subtitle decoder, 600: time comparison circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 5D110 AA26 AA27 AA28 AA29 CA47 CA49 DA17 DB02 FA01

Claims (10)

[Claims] 1. A broadcast signal recording / reproducing apparatus which supports time-lag viewing, comprising: a recording medium for recording a received broadcast signal;
Upon receiving the signal read from the recording medium, a time information determining means for determining whether or not time information is included in the video presented on the monitor screen, and receiving a determination result of the time information determining means, Time information masking means for performing a process of masking a time display portion in a broadcast signal with a signal having substantially the same level as a luminance signal and a chrominance signal around the time display and transmitting the processed signal to the monitor. Broadcast signal recording and playback device. 2. A broadcast signal recording / reproducing apparatus which supports time-lag viewing, comprising: an encoder for receiving and digitizing an analog broadcast signal; a recording medium for recording an output signal of the encoder; and a recording medium for reading from the recording medium. A decoder that converts a digital signal into an analog signal, a time information determining unit that receives an output signal of the decoder, and determines whether time information is included in a video presented on a monitor screen;
In response to the determination result of the time information determination means, a process of masking the time display portion in the video signal obtained from the decoder with a signal having substantially the same level as the luminance signal and the color signal around the time display is performed. Time information masking means, time management means for managing the current time, and, based on the current time information from the time management means, pasting processing of the current time on the video signal masked by the time information masking means. And a time information inserting means for transmitting the time information to the monitor. 3. A broadcast signal recording / reproducing apparatus which supports time-lag viewing, comprising: a recording medium for recording a received broadcast signal;
Upon receiving the signal read from the recording medium, a time information determining means for determining whether or not time information is included in the video presented on the monitor screen, and receiving a determination result of the time information determining means, Time information masking means for performing a process of masking a time display portion in the broadcast signal with a signal having substantially the same level as a luminance signal and a color signal around the time display, time management means for managing the current time, Based on the current time information from the time management means, performing a pasting process of the current time on the video signal masked by the time information masking means, and transmitting time information to the monitor. A broadcast signal recording / reproducing apparatus characterized by the above-mentioned. 4. A broadcast signal recording / reproducing apparatus which supports time-lag viewing, comprising: a recording medium for recording a received broadcast signal;
Upon receiving the signal read from the recording medium, a time information determining means for determining whether or not time information is included in the video presented on the monitor screen, and receiving a determination result of the time information determining means, A broadcast signal recording / reproducing apparatus, comprising: time information control means for performing a fitting process by changing a color of a time display portion in a broadcast signal and transmitting the same to the monitor. 5. A broadcast signal recording / reproducing apparatus that supports time-lag viewing, comprising: a recording medium for recording a received broadcast signal;
Upon receiving the signal read from the recording medium, a time information determining means for determining whether or not time information is included in the video presented on the monitor screen, and receiving a determination result of the time information determining means, A broadcast signal recording / reproducing apparatus, comprising: time information control means for performing a blinking process on a time display portion in a broadcast signal and transmitting the same to the monitor. 6. A broadcast signal recording / reproducing apparatus that supports time difference viewing and listening, receives a digital broadcast to which time information is sent as a video signal and a subtitle signal, records the signal on a recording medium, and then records the signal. Means for reading out the demodulated signal, demodulating the signal, and outputting the demodulated signal, when time-lag viewing (time-shift viewing) is being performed, means for preventing the time information recorded in the recorded video signal from being inserted. A broadcast signal recording / reproducing device having the same. 7. The broadcast signal recording / reproducing apparatus according to claim 6, further comprising means for inserting a currently transmitted subtitle signal as time information in place of said time information not to be inserted. 8. The broadcast signal recording / reproducing apparatus according to claim 6, further comprising means for setting the current time of the receiver in place of the time information not to be set. 9. The broadcast signal recording / reproducing apparatus according to claim 6, further comprising means for setting the current time managed by the receiver based on time information obtained from digital broadcasting instead of the time information not to be set. 10. A broadcast signal recording / reproducing apparatus which supports time-lag viewing, receives a broadcast signal, records the signal on a recording medium, reads the recorded signal, demodulates the signal, and outputs a demodulated signal. A broadcast signal recording / reproducing apparatus having a means for reproducing a recorded video signal and skipping a video as necessary to catch up to real-time viewing in a circuit for realizing a time shift function,