JP4412321B2 - TV program transmission / recording / playback system - Google Patents

Description

  The present invention includes a transmission device of a television broadcast station that transmits a broadcast signal of a television program, and an information recording / reproduction device that receives the broadcast signal from the transmission device and records or reproduces a desired television program. More particularly, the present invention relates to an information recording / reproducing apparatus that performs a recording operation that enables a recording bit rate to be changed when a television program is recorded.

  Recently, a video / audio signal of a broadcast signal of a television program transmitted from a television broadcast station is converted into digital data and recorded, for example, on a hard disk of a hard disk recorder. The hard disk recorder realizes the same function as a conventionally known video tape recorder or the like, and can record a TV program and then reproduce it when it is desired to view the recorded TV program. It is like that.

  By the way, when video data is recorded in a hard disk recorder, the hard disk can be used efficiently by performing data compression using an encoding technique such as MPEG. For example, the lower the data bit rate (transfer rate), the greater the amount of information that is thinned out and the lower the image quality, but the size of the video data can be reduced. Can take a lot. Conversely, the higher the data bit rate, the smaller the amount of information that is thinned out and the higher the image quality, but the larger the video data size, the larger the hard disk recording capacity, and the hard disk recording time. Less.

Therefore, when recording a TV program on a hard disk recorder, the user sets a bit rate (recording mode) as image quality information when setting a recording reservation (recording reservation). For example, for programs that do not require much image quality, such as news programs, information programs, and language programs, a low-quality recording bit rate (recording mode LP) is selected and set, and a certain level of image quality such as drama programs is required. For programs to be played, standard bit rate recording mode (recording mode SP) is selected and set, and programs such as movie programs and music programs that require a sense of realism, sports broadcast programs, etc. In addition, for a program such as a ball or a player that is moving rapidly, a high-quality recording bit rate (recording mode XP) can be selected and set. However, when simply reducing the capacity of the video data, it is possible to select and record a low-quality recording bit rate (recording mode LP) even for a movie program, a music program, or a sports broadcast program.
JP 2001-285801 A JP 2004-297823 A

  By the way, the capacity of a hard disk as a recording medium has been increased, and for example, in order to effectively use this large capacity hard disk, for example, it is broadcast on a certain channel over a daytime during which broadcasting is performed. There is a case where it is desired to perform long-time recording in which recorded programs (news programs, drama programs, sports broadcast programs, etc.) are continuously recorded. In this case, the user can view the programs that have been recorded for a long time, for example, at a time when the user likes a holiday, for example.

  When performing such continuous recording for a long time, for example, the image quality (recording mode) set at the time of setting the recording reservation is valid, so in a state where recording is being executed based on the recording reservation setting. The image quality cannot be changed (recording mode can be changed). Therefore, when the recording reservation setting is performed and the selected image quality is low (recording mode LP), all programs are recorded with low image quality.

  When recording is performed with low image quality over a long period of time, the amount of data is small, and the hard disk can be used efficiently. However, for example, in a program such as a movie program or a music program that requires good image quality, the image is degraded due to low-quality recording, so that the realistic sensation of the image is reduced. In addition, for example, a sports broadcast program with a fast moving image is recorded with a low image quality, so that the smooth movement of a ball or a player is impaired. However, for example, when setting the image quality according to the type of program, it is necessary to set the recording reservation for each program included in the time zone to be recorded and individually set the desired image quality. However, it wasn't good to use bothersomely.

  Therefore, in the prior art of Patent Document 1, the image quality is set for each program in accordance with the type of program to be recorded (recorded) so that high-quality recording and low-quality recording can be performed efficiently. That is, in this prior art, on the broadcast program transmitting device side, image quality information indicating the program type is superimposed and transmitted in the vertical blanking period of the video signal, and the image quality information indicating the program type is detected on the recording device side. Therefore, it is possible to set the recording image quality based on the image quality information, so that the recording image quality can be changed according to the type of broadcast program even while the recording is being executed. Can be performed efficiently.

  By the way, in one program, there are scenes with a lot of movement and scenes with little movement depending on the scene. In such a case, it is necessary to record a scene with a lot of movement in a high-quality recording mode (recording bit rate), but a scene with little movement needs to be recorded in a high-quality recording mode (recording bit rate). Even if recording is performed in the low image quality recording mode, the quality of the reproduced video is not inferior to the user. Therefore, according to the prior art of Patent Document 1, even if there is a scene where there is a lot of movement or a scene where there is almost no movement in one program, the recording image quality (recording mode) set for each program is performed. There is a problem that the recording capacity of the medium is wasted.

  In the prior art of Patent Document 2, the transmission device outputs the control information separately from the video / audio signal by superimposing the MPEG compression rate in the vertical blanking period of the video signal, and the reception device outputs the video signal. The control information is separated from the video signal, and appropriate signal processing is applied to the video signal according to this control information. However, there is a scene where there is a lot of movement or a little movement in one program. A process for changing the recording mode is not disclosed.

  The present invention has been made to solve the above-described problems, and transmits a television program having an information recording / reproducing apparatus capable of recording video by changing the recording bit rate of the video recorded on the recording medium in real time. An object is to provide a recording / reproducing system.

  In order to achieve the above-described object, the invention of claim 1 is directed to a television broadcast station transmitting device for transmitting a broadcast signal of a television program, and receiving a broadcast signal from the transmitting device to record a desired television program. In a television program transmission / recording / reproduction system provided with an information recording / reproduction device for reproduction, the transmission device obtains a type of a television program to be broadcast and a video signal of the television program to be broadcast at predetermined intervals. A bit rate creating means for creating bit rate information indicating a minimum recording bit rate used in the information recording / reproducing apparatus based on the degree of change of the received video signal; and Bit rate information superimposing means for superimposing the signal in the vertical blanking period, and configured to transmit a broadcast signal including the bit rate information, Bit rate information for changing the recording bit rate on the device side based on the type of the TV program and the degree of motion of the video when the device is set to the automatic recording mode and detects a recording instruction Bit rate information extracting means for extracting bit rate information from the video signal from the tuner that has received a broadcast signal including the transmitter from the transmitter, and changing the recording bit rate at the time of recording based on the extracted bit rate information Recording control means for recording the television program on the recording medium, and changing the recording bit rate at the time of recording based on the bit rate information to record the television program on the recording medium. Provided is a television program transmission / recording / reproduction system characterized by being configured.

  In this configuration, in the transmission apparatus of the television broadcasting station, the beat rate creating means includes the type of the television program to be broadcast and the degree of change in the video signal obtained by detecting the video signal of the broadcast TV program every predetermined time. Based on the above, the bit rate information indicating the minimum recording bit rate used in the information recording / reproducing apparatus is created, and the bit rate information superimposing means converts the bit rate information into the vertical blanking period of the video signal of the television program. Superimpose. The transmission device transmits a broadcast signal including the bit rate information.

  In the information recording / reproducing apparatus, when it is detected that the automatic recording mode is set and recording is detected, the bit rate information extracting means extracts the bit rate information from the video signal from the tuner. The recording control means changes the recording bit rate at the time of recording based on the bit rate information, and causes the recording medium to record the television program.

  According to this configuration, the transmission apparatus creates bit rate information based on the type of television program to be broadcast and the degree of change in the video signal of the television program, and uses the bit rate information as the vertical signal of the video signal of the television program. When the information recording / reproducing apparatus detects a recording instruction, the information recording / reproducing apparatus changes the recording bit rate at the time of recording based on the bit rate information and records the television program on the recording medium. Since recording is performed, the video can be recorded by changing the recording bit rate of the video recorded on the recording medium in real time, so that the video can be reproduced with appropriate image quality and the recording capacity of the recording medium can be used effectively. It becomes possible to do.

  According to a second aspect of the present invention, there is provided a transmission device of a television broadcast station that transmits a broadcast signal of a television program, and an information recording / reproduction device that receives the broadcast signal from the transmission device and records or reproduces a desired television program. In the television program transmission / recording / reproduction system comprising: the transmission device generates bit rate information based on a type of a television program to be broadcast and a degree of change in the video signal of the television program, and the bit rate information is The information recording / reproducing apparatus is configured to transmit a broadcast signal superimposed on a vertical blanking period of a video signal of the television program, and the information recording / reproducing apparatus records a recording bit rate at the time of recording based on the bit rate information when detecting a recording instruction. A television program transmission / recording / reproducing system is provided, which is configured to record the television program on a recording medium by changing the above.

  In this configuration, the transmission apparatus creates bit rate information based on the type of television program to be broadcast and the degree of change in the video signal of the television program, and uses the bit rate information as the vertical blanking of the video signal of the television program. A broadcast signal is transmitted superimposed on the period. In the information recording / reproducing apparatus, when the recording instruction is detected, the television program is recorded on the recording medium by changing the recording bit rate at the time of recording based on the bit rate information.

  According to this configuration, it is possible to record the video by changing the recording bit rate of the video recorded on the recording medium in real time, thereby reproducing the video with an appropriate image quality and effectively increasing the recording capacity of the recording medium. It becomes possible to use.

  According to a third aspect of the present invention, in the second aspect of the present invention, the transmitting device detects the type of a television program to be broadcast and the change in the video signal obtained by detecting the video signal of the broadcast television program every predetermined time. A bit rate generating means for generating bit rate information indicating a minimum recording bit rate to be used in the information recording / reproducing apparatus based on the degree, and the bit rate information in the vertical blanking period of the video signal of the television program. And bit rate information superimposing means for superimposing.

  Therefore, the transmission apparatus can realize bit rate creation processing and bit rate information superimposition processing, thereby creating bit rate information based on the type of television program to be broadcast and the degree of change in the video signal of the television program. In addition, the bit rate information can be superimposed on the vertical blanking period of the video signal of the television program.

  According to a fourth aspect of the present invention, in the second aspect of the invention, the information recording / reproducing apparatus is set to the automatic recording mode, and when the recording instruction is detected, the type of the television program and the degree of motion of the video are determined. Bit rate information extracting means for extracting the bit rate information from the video signal from the tuner that has received the broadcast signal including the bit rate information for changing the recording bit rate on the device side based on the transmission device; And a recording control means for recording the television program on a recording medium by changing the recording bit rate at the time of recording based on the extracted bit rate information.

  Therefore, the information recording / reproducing apparatus can realize the bit rate information extraction process and the recording control process, whereby when the recording instruction is detected, the recording bit rate at the time of recording is changed on the recording medium based on the bit rate information. On the other hand, the television program can be recorded.

  As described above, according to the present invention, a transmission device of a television broadcast station that transmits a broadcast signal of a television program, and information for recording or reproducing a desired television program by receiving the broadcast signal from the transmission device. In a television program transmission / recording / reproduction system including a recording / reproducing device, the transmitting device detects a type of a television program to be broadcast and a video signal obtained by detecting a video signal of the broadcast television program at predetermined intervals. A bit rate generating means for generating bit rate information indicating a minimum recording bit rate used in the information recording / reproducing apparatus based on a degree of change, and a vertical retrace of the video signal of the television program; Bit rate information superimposing means for superimposing the period, and configured to transmit a broadcast signal including the bit rate information. When a recording instruction is detected when the mode is set, a broadcast signal including bit rate information for changing the recording bit rate on the device side based on the type of the TV program and the degree of motion of the video is transmitted. Bit rate information extracting means for extracting bit rate information from the video signal received from the tuner from the transmitter, and changing the recording bit rate at the time of recording based on the extracted bit rate information Recording control means for recording the TV program, so that the video can be recorded by changing the recording bit rate of the video recorded on the recording medium in real time. It can be reproduced and the recording capacity of the recording medium can be used effectively.

  Further, according to the present invention, a transmission device of a television broadcast station that transmits a broadcast signal of a television program, and an information recording / reproduction for receiving or receiving a broadcast signal from the transmission device to record or reproduce a desired television program In the television program transmission / recording / reproducing system comprising the device, the transmission device creates bit rate information based on a type of the television program to be broadcast and a degree of change in the video signal of the television program, and the bit rate information Is superimposed on the vertical blanking period of the video signal of the television program, and the information recording / reproducing apparatus detects the recording bit when recording based on the bit rate information when detecting the recording instruction. Since the TV program is recorded on the recording medium at a different rate, the recording bit rate of the video recorded on the recording medium is Change can record images on, thereby, it is possible to reproduce the video at the right quality, it is possible to effectively use the recording capacity of the recording medium.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of a television program transmission / recording / reproducing system according to an embodiment of the present invention. Here, a description will be given of a process of recording a television program by changing a recording bit rate at the time of recording in a hard disk recorder as an information recording / reproducing apparatus. It goes without saying that a process of recording a television program by changing the recording bit rate can be applied.

  In FIG. 1, this hard disk recorder H includes a tuner 1, an A / D converter 2, an encoder 3, an interface 4, a hard disk drive 5, a hard disk 5a, a decoder 6, a D / A converter 7, an output selection switch 8, a bit rate. / Recording mode information memory 9, reservation setting memory 10, timer 11, character generator 12, system controller 13, bus 14, operation unit 15, display unit 16, and character ROM 17 are provided. The bit rate / recording mode information memory 9, the reservation setting memory 10 and the character ROM 17 can be realized by a single flash ROM.

  The tuner 1 selects a desired broadcast signal from the broadcast signals received by the antenna A, performs demodulation, and extracts a video / audio signal of a desired television program. The A / D converter 2 converts the video signal of the video / audio signal from the tuner 1 into digital data at a required sampling frequency, and supplies the converted video data to the encoder 3. A description of the processing of the audio signal from the tuner 1 is omitted.

  The encoder 3 performs data compression by MPEG, for example, and outputs the compressed video data to the interface 4. The hard disk drive 5 records video data and the like input via the interface 4 on the hard disk 5a, and reproduces video data and the like recorded on the hard disk 5a and outputs them to the interface 4.

  When the video data recorded on the hard disk 5 a is reproduced by the hard disk drive 5, the decoder 6 decompresses the video data supplied via the interface 4 and supplies the decompressed video data to the D / A converter 7. The D / A conversion unit 7 converts the video data expanded by the decoding unit 6 into an analog video signal. The video signal output from the D / A converter 7 is selected by the output selection switch 8 and supplied to a monitor device (not shown) such as a television receiver.

  The output selection switch 8 is configured to select a video signal output from the hard disk recorder H to the monitor device. For example, when the terminal a is selected, the output from the tuner 1 is indicated by a signal path L. When the video signal is output and the terminal b is selected, the video signal output from the D / A converter 7 is generated. When the terminal c is selected, the video signal is generated by the character generator 12 described later. The video signal of the operation screen is output.

  The bit rate / recording mode information memory 9 stores a table indicating the correspondence between the recording bit rate indicated by the bit rate information included in the broadcast signal transmitted from the television broadcast station T and the recording mode (recording image quality). ing. That is, in the bit rate / recording mode information memory 9, when the recording bit rate indicated by the bit rate information is high quality, the recording mode is XP, and when the recording bit rate is medium quality, the recording mode is SP. When the image quality is low, a table indicating that the recording mode is LP is stored. For example, a channel number, a recording start time, a recording end time, a recording mode (recording bit rate), and the like are stored in the reservation setting memory 10 as setting information when recording reservation (recording reservation) is performed.

  The timer 11 measures the current time, and outputs a recording start signal and a recording end signal when the current time reaches the recording start time and recording end time of the recording reservation. The character generator 12 generates and outputs, for example, a character signal corresponding to a menu screen for performing various settings of the hard disk recorder H based on various input operations by the operation unit 15 such as a remote controller. Character information for generating a character signal is stored in the character ROM 17. Therefore, when the character generator 12 generates a character signal, required character information is read from the character ROM 17.

  The system controller 13 is composed of, for example, a microcomputer and performs various controls of the above-described components via the bus 14. In particular, when the system controller 13 in this embodiment is set to the automatic recording mode and detects a recording instruction, the recording bit rate changes on the hard disk recorder H side according to the type of television program and the degree of motion of the video. Bit rate information extracting means for extracting the bit rate information from the video signal from the tuner 1 that has received the broadcast signal including the bit rate information for recording, and the recording bit rate at the time of recording based on the extracted bit rate information And a recording control means for recording the television program on the hard disk 5a.

  The operation unit 15 includes various operation keys and various setting keys for executing a reproduction operation, a recording operation, a channel selection operation, and the like of the hard disk recorder H. Operation signals input from various keys of the operation unit 15 are supplied to the system controller 13. Based on the operation signal supplied from the operation unit 15, for example, the system controller 13 performs channel selection control in the tuner 1, tuner 1, A / D conversion unit 2, encoder 3, interface 4, and hard disk drive 5. Is controlled to execute a recording operation, or the hard disk drive 5, the interface 4, the decoder 6, and the D / A converter 7 are controlled to execute a reproducing operation. Further, the recording reservation setting can be performed by the operation unit 15, and the set recording reservation setting information is stored in the reservation setting memory 10.

  The transmission device 20 of the television broadcast station T uses the hard disk recorder H based on the type of the television program to be broadcast and the degree of change in the video signal obtained by detecting the video signal of the broadcast television program every predetermined time. Bit rate generating means for generating bit rate information indicating the minimum recording bit rate used in the video, and a bit rate for superimposing the bit rate information on a vertical blanking interval (VBI) of a video signal of the television program And an information superimposing unit configured to transmit a broadcast signal including the bit rate information.

  In other words, the transmission device 20 changes the recording bit rate on the hard disk recorder H side based on the type of TV program such as a drama or movie and the degree of motion of the video that changes depending on the scene (the degree of change in the video signal). The bit rate information of the TV program is superimposed on the VBI of the video signal of the TV program, and the broadcast signal of the TV program is transmitted from the antenna B on the radio wave. Therefore, the hard disk recorder H extracts bit rate information from the received broadcast signal, changes the recording bit rate at the time of recording based on the bit rate information, and records the television program.

  FIG. 2 is a flowchart for explaining processing from the creation of bit rate information to the transmission of a broadcast signal in the television broadcast station of this embodiment. With reference to this flowchart and FIG. 1, the process from the creation of bit rate information to the transmission of a broadcast signal in a television broadcast station will be described.

  The transmission device 20 of the television broadcast station T creates bit rate information based on the type of television program such as a drama or movie and the degree of change in the video signal that changes depending on the scene. In other words, the hard disk recorder H creates bit rate information indicating a recording bit rate of an image quality that does not cause a problem as a reproduced video even when recording with a recording bit rate lowered so far during recording (step S1). . In the transmission device 20 of the television broadcasting station T, the bit rate of image compression is fixed. For example, if the bit rate is the recording mode XP, broadcasting of a television program including a video signal compressed at the bit rate of the recording mode XP. A signal is transmitted.

  By the way, in a television receiver, if the image quality of a drama is compared with the image quality of a movie, the image quality of a drama is usually better than the image quality of a movie, so the recording mode of the hard disk recorder H is recorded with LP as a recording mode. However, when recording a movie, if the recording mode is set to LP, the image quality is further deteriorated. Therefore, when transmitting a drama program, the transmission device 20 of the television broadcasting station T says that the hard disk recorder H side should not lower the recording mode any more, for example, a bit indicating a recording mode LP (recording bit rate). The rate information is created, the bit rate information is superimposed on the VBI of the video signal of the drama program (step S2), and the broadcast signal of the drama program is transmitted on the radio wave from the antenna B (step S3). Further, in the transmission device 20 of the television broadcasting station T, when transmitting a movie program, the hard disk recorder H side should not lower the recording mode any more, for example, a bit indicating a recording mode SP (recording bit rate). The rate information is created, the bit rate information is superimposed on the VBI of the video signal of the movie program, and the broadcast signal of the movie program is transmitted from the antenna B on the radio wave.

  A broadcast signal including such bit rate information is transmitted from the television broadcast station T. Furthermore, in the transmission device 20 of the television broadcast station T, the video signal of the program is transmitted every predetermined time (for example, every 5 seconds). The degree of change in the detected video signal is divided into three stages corresponding to, for example, the recording modes XP, SP, and LP, and the degree of change in the video signal, that is, the degree of motion of the video of the program is also taken into consideration. Create bit rate information. For example, in a drama program, if the degree of motion of the video is large for only 5 seconds and the motion of the video is small for 55 seconds in a certain one-minute scene, the hard disk recorder H that records this scene for 55 seconds Even if the recording mode of the scene is low, the reproduced image is not divided in that the image quality deteriorates.Therefore, there is no problem even if it is recorded in the low recording mode.Therefore, when creating the bit rate information, the degree of motion of the video is also taken into consideration. Create.

  For example, when creating bit rate information relating to a movie program, the recording mode capable of handling scenes with a high degree of motion of the video may be SP, for example. Even if the recording mode is not SP but LP, the quality of the reproduced video is good. Therefore, since the bit rate information transmitted from the transmitting device 20 of the television broadcasting station T to the hard disk recorder H considers the type of program and the degree of motion of the video, the quality of the reproduced video is good and the hard disk 5a The program can be recorded while saving the recording capacity.

  FIG. 3 is a flowchart for explaining processing when a television program is recorded in the hard disk recorder of the present embodiment. With reference to this flowchart and FIG. 1, processing when a television program is recorded in the hard disk recorder will be described.

  First, since the user wants to record the TV program in the automatic recording mode, the user operates the operation unit 15 to display the setting screen on the monitor device, and selects and determines the item of the automatic recording mode. It is detected that the automatic recording mode is set (step N1). When the user operates the recording key of the operation unit 15 or when the current time measured by the timer 11 becomes the recording start time by the recording reservation, the system controller 13 detects that the recording is instructed. (Step N2).

  Next, the bit rate information extracting means of the system controller 13 generates a broadcast signal including bit rate information for changing the recording bit rate on the apparatus side based on the type of the TV program and the degree of change of the video signal. The bit rate information is extracted from the video signal from the tuner 1 received from the transmission device 20 of the television broadcasting station T, and the recording control means controls the hard disk drive 5 and records bits at the time of recording based on the bit rate information. The TV program is recorded on the hard disk 5a at a different rate (step N3).

  For example, when the TV program is a drama, the bit rate information indicates the recording bit rate which is the recording mode SP when the video is normal motion, and the recording mode LP when the video is almost still. Assuming that the recording bit rate is indicated, the system controller 13 causes the hard disk drive 5 to perform the recording operation in the recording mode SP when the video is in a normal motion, or the recording mode LP when the video is almost still. To make a recording operation. Since the bit rate information transmitted from the transmitting device 20 of the television broadcasting station T to the hard disk recorder H takes into account the type of program and the degree of motion of the video, the reproduced video has good image quality and the recording capacity of the hard disk 5a. And the program can be recorded.

  When the user operates the stop key of the operation unit 15 while the recording operation is performed in this way, or when the current time measured by the timer 11 becomes the recording end time by the recording reservation, The controller 13 detects that a recording end instruction has been issued (step N4), stops the recording operation of the hard disk drive 5, and ends this processing.

  Further, since the user wants to record the television program in the setting recording mode, the user operates the operation unit 15 to display the setting screen on the monitor device, selects the setting recording mode item, and determines the recording mode. 13 detects that the setting recording mode has been set (step N5). When the user operates the recording key of the operation unit 15 or when the current time measured by the timer 11 becomes the recording start time by the recording reservation, the system controller 13 detects that the recording is instructed. (Step N6).

  Then, the recording control means of the system controller 13 controls the hard disk drive 5 and causes the hard disk 5a to record the television program at the set recording mode bit rate (step N7). When the user operates the stop key of the operation unit 15 while the recording operation is performed in this way, or when the current time measured by the timer 11 becomes the recording end time by the recording reservation, The controller 13 detects that a recording end instruction has been issued (step N8), stops the recording operation of the hard disk drive 5, and ends this processing.

  As described above, according to the present embodiment, the transmission device 20 of the television broadcasting station T creates bit rate information based on the type of television program to be broadcast and the degree of change in the video signal of the television program, and The broadcast signal is transmitted by superimposing the bit rate information on the vertical blanking period of the video signal of the television program. When the hard disk recorder H detects the recording instruction, the recording bit rate at the time of recording is determined based on the bit rate information. Since the television program is recorded on the hard disk 5a, the video can be recorded by changing the recording bit rate of the recorded video in real time, thereby reproducing the video with appropriate image quality. At the same time, the recording capacity of the hard disk 5a can be used effectively.

  The present invention can be used for a hard disk recorder, a DVD recorder, a video tape recorder, and the like, and can record a television program by changing a recording bit rate at the time of recording.

It is a block diagram which shows the structure of the television program transmission / recording / reproducing system which concerns on one Embodiment of this invention. It is a flowchart for demonstrating the process after producing bit rate information in the television broadcasting station of the said embodiment until it transmits a broadcast signal. It is a flowchart for demonstrating the process in the case of recording a television program in the hard-disk recorder of the said embodiment.

Explanation of symbols

13 System controller (bit rate information extraction means, recording control means)
20 Transmitter (bit rate creating means, bit rate information superimposing means)
H Hard disk recorder (information recording / reproducing device)
T TV broadcasting station

Claims (4)

Television program transmission comprising a television broadcast station transmission device for transmitting a broadcast signal of a television program, and an information recording / reproducing device for receiving the broadcast signal from the transmission device to record or reproduce a desired television program / In the recording and playback system,
The transmitting device uses the minimum information used in the information recording / reproducing device based on the type of the television program to be broadcast and the degree of change in the video signal obtained by detecting the video signal of the broadcast television program every predetermined time. Bit rate generating means for generating bit rate information indicating a limited recording bit rate, and bit rate information superimposing means for superimposing the bit rate information on a vertical blanking period of a video signal of the television program, Configured to transmit broadcast signals containing information,
When the information recording / reproducing apparatus is set to the automatic recording mode and detects the recording instruction, the information recording / reproducing apparatus changes the recording bit rate on the apparatus side based on the type of the TV program and the degree of motion of the video. Bit rate information extracting means for extracting bit rate information from a video signal from the tuner that has received a broadcast signal including bit rate information from the transmitter, and a recording bit at the time of recording based on the extracted bit rate information Recording control means for recording the television program on the recording medium at a different rate, and recording the television program on the recording medium by changing the recording bit rate at the time of recording based on the bit rate information. A television program transmission / recording / reproducing system characterized by being configured to perform. Television program transmission comprising a television broadcast station transmission device for transmitting a broadcast signal of a television program, and an information recording / reproducing device for receiving the broadcast signal from the transmission device to record or reproduce a desired television program / In the recording and playback system,
The transmitter creates bit rate information based on the type of television program to be broadcast and the degree of change in the video signal of the television program, and superimposes the bit rate information on the vertical blanking period of the video signal of the television program. Configured to transmit broadcast signals,
The information recording / reproducing apparatus is configured to record the television program on a recording medium by changing a recording bit rate at the time of recording based on the bit rate information when a recording instruction is detected. TV program transmission / recording / playback system.   The transmitting device uses the minimum information used in the information recording / reproducing device based on the type of the television program to be broadcast and the degree of change in the video signal obtained by detecting the video signal of the broadcast television program every predetermined time. A bit rate generating means for generating bit rate information indicating a limited recording bit rate; and a bit rate information superimposing means for superimposing the bit rate information on a vertical blanking period of a video signal of the television program. The television program transmission / recording / reproducing system according to claim 2.   When the information recording / reproducing apparatus is set to the automatic recording mode and detects the recording instruction, the information recording / reproducing apparatus changes the recording bit rate on the apparatus side based on the type of the television program and the degree of motion of the video. The bit rate information extracting means for extracting the bit rate information from the video signal from the tuner that has received the broadcast signal including the bit rate information from the transmitter, and recording at the time of recording based on the extracted bit rate information The television program transmission / recording / reproducing system according to claim 2, further comprising recording control means for recording the television program on a recording medium by changing a bit rate.

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