JP4340970B2 - RECORDING INFORMATION GENERATION DEVICE, RECORDING INFORMATION GENERATION METHOD, INFORMATION REPRODUCTION DEVICE, INFORMATION REPRODUCTION METHOD, RECORDING / REPRODUCTION DEVICE, RECORDING / REPRODUCTION METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to a recording information generating device and a recording information generating method, an information reproducing device and an information reproducing method, a recording and reproducing device and a recording and reproducing method, and a program, and in particular, records a broadcast signal adopting a layered transmission method. The present invention relates to a recording information generating device and a recording information generating method, an information reproducing device and an information reproducing method, a recording / reproducing device, a recording / reproducing method, and a program suitable for use in reproduction.

  Hierarchical transmission systems are employed in BS (Broadcasting Satellite) digital broadcasting and wide area CS (Communications Satellite) digital broadcasting. Hierarchical transmission is a service that allows the presentation of services to be continued even in situations where the reception level decreases, such as during rain, in addition to high-quality video signals for normal viewing. Thus, a video signal that can be stably received even when the reception level is lowered is transmitted together.

  Conventionally, for example, due to rain attenuation or the like, a decrease in the received electric field strength of the broadcast signal corresponding to the hierarchical transmission method is caused by a decrease in the received bit error rate, the received C / N ratio (C / N level), or the like. When detected, a technique that can perform low-layer reception on the receiver side is used (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2001-078180

  In a television receiver that can receive a broadcast signal and present it in real time, or a receiver such as an STB (Set Top Box), if it is a receiver that supports the description of a hierarchical transmission descriptor, The C / N level is monitored, and when the level is lowered, the elementary stream is automatically switched according to the description, low-layer reception is performed, and the user can be notified of this. In addition, in the case of a receiver that does not support the description of the hierarchical transmission descriptor or a program that does not have a hierarchical transmission descriptor, presentation of elementary streams may be stopped.

  Elementary streams transmitted at a lower hierarchy are basically inferior in video and audio quality compared to elementary streams transmitted at a higher hierarchy. Therefore, when the hierarchy of the displayed video or the output audio is switched, if the user is not notified that the elementary stream to be switched has been switched, the user is informed why the quality is inferior. The situation cannot be grasped as to whether the elementary stream is being presented or why the elementary stream is no longer presented.

  However, when recording / playing back a digital broadcast signal, it is impossible to present the cause of a decrease in image quality to the user as in the case of receiving an actual broadcast signal (live reception). If the recorded signal is switched between the high layer and the low layer, the user who reproduced this recorded signal is presenting an elementary stream with inferior quality, or why the elementary stream The situation cannot be grasped whether it is no longer presented.

  The present invention has been made in view of such a situation, and when recording and reproducing a broadcast signal adopting a layered transmission method, it is possible to switch between a high hierarchy and a low hierarchy in the reproduction signal, This makes it possible to notify the user that the hierarchy has been switched.

The recorded information generation apparatus of the present invention includes an acquisition unit that acquires a broadcast signal adopting a hierarchical transmission method, a detection unit that detects information indicating a reception status of the broadcast signal acquired by the acquisition unit, and a detection unit Based on the information indicating the reception status of the broadcast signal detected by, the selection means for selecting the recorded stream data from the stream data included in the broadcast signal, and the reception status of the broadcast signal detected by the detection means Conversion means for converting the control information included in the broadcast signal as necessary based on the information to be displayed, and the selection means includes information indicating the reception status of the broadcast signal detected by the detection means. If the situation is good, select the high-level stream data as the stream data to be recorded from the stream data included in the broadcast signal. When the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good, select all the stream data included in the broadcast signal as recorded stream data, When the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is good, the conversion means converts the hierarchical transmission description from the PMT included in the control information of the broadcast signal. If the predetermined information as a child is deleted, and the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good, the control information included in the broadcast signal is It is characterized by not converting .

  A recording control unit that controls recording of the stream data selected by the selection unit and the control information converted by the conversion unit as necessary can be further provided.

The recording information generation method of the present invention includes an acquisition step of acquiring a broadcast signal, a detection step of detecting information indicating the reception status of the broadcast signal acquired by the processing of the acquisition step, and the broadcast detected by the processing of the detection step Based on the information indicating the reception status of the signal, information indicating the reception status of the broadcast signal detected by the selection step of selecting the stream data to be recorded from the stream data included in the broadcast signal and the processing of the detection step A conversion step of converting control information included in the broadcast signal as necessary. In the processing of the selection step, information indicating the reception status of the broadcast signal detected by the processing of the detection step is If the reception status indicates good, among the stream data included in the broadcast signal, If the information indicating the reception status of the broadcast signal selected as the stream data to be recorded and detected by the processing of the detection step indicates that the reception status of the broadcast signal is not good, the stream data included in the broadcast signal Are selected as stream data to be recorded, and in the process of the conversion step, the information indicating the reception status of the broadcast signal detected by the detection step process indicates that the reception status of the broadcast signal is good The information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the control information of the broadcast signal, and the reception status of the broadcast signal is good. If it is not, the control information included in the broadcast signal is not converted .

The first program of the present invention includes an acquisition step of acquiring a broadcast signal, a detection step of detecting information indicating a reception status of the broadcast signal acquired by the process of the acquisition step, and a broadcast detected by the process of the detection step Based on the information indicating the reception status of the signal, information indicating the reception status of the broadcast signal detected by the selection step of selecting the stream data to be recorded from the stream data included in the broadcast signal and the processing of the detection step Based on this, the computer is caused to execute a process including a conversion step of converting the control information included in the broadcast signal as necessary, and the selection step process indicates the reception status of the broadcast signal detected by the detection step process. When the information indicates that the reception status of the broadcast signal is good, among the stream data included in the broadcast signal, When the stream data of the hierarchy is selected as the stream data to be recorded, and the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is not good, All the stream data included in the signal is selected as stream data to be recorded, and in the process of the conversion step, the information indicating the broadcast signal reception status detected by the detection step process is good in the broadcast signal reception status. Information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the control information of the broadcast signal, If the reception status of the signal indicates that it is not good, it characterized in that it does not convert the control information included in the broadcast signal.

In the recorded information generating apparatus, the recorded information generating method, and the first program of the present invention, a broadcast signal adopting a layered transmission method is acquired, information indicating the reception status of the broadcast signal is detected, and broadcasting is performed. Based on the information indicating the signal reception status, the recorded stream data is selected from the stream data included in the broadcast signal, and the control information included in the broadcast signal is converted as necessary. If the information indicating the reception status of the detected broadcast signal indicates that the reception status of the broadcast signal is good, high-level stream data is recorded among the stream data included in the broadcast signal. If the information indicating the reception status of the broadcast signal selected and detected as stream data indicates that the reception status of the broadcast signal is not good, the stream data in which all the stream data included in the broadcast signal is recorded If the information indicating the reception status of the broadcast signal selected and detected indicates that the reception status of the broadcast signal is good, it is a hierarchical transmission descriptor from the PMT included in the control information of the broadcast signal. If the predetermined information is deleted and the information indicating the reception status of the detected broadcast signal indicates that the reception status of the broadcast signal is not good, Control information is not converted included in the item.

The information reproducing apparatus of the present invention includes an acquisition unit that acquires stream data and control information recorded on a predetermined recording medium, and an extraction unit that extracts a predetermined PMT from the stream data and control information acquired by the acquisition unit If, on the PMT extracted by the extraction means, based on whether or not includes a predetermined hierarchical transmission descriptor, and a reproduction control means for controlling the reproduction of the stream data, the reproduction control means, hierarchy PMT When the transmission descriptor is not included, the reproduction of the higher layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, the reproduction of the lower layer stream data is controlled. To do.

  When the stream data whose reproduction is controlled by the reproduction control means is switched from the high-level stream data to the low-level stream data, or from the low-level stream data to the high-level stream data, the reproduction is controlled by the reproduction control means. Notification processing execution means for executing processing for notifying the user that the stream data to be controlled has been switched can be further provided.

An information reproduction method of the present invention extracts a predetermined PMT from an acquisition step of acquiring stream data and control information recorded on a predetermined recording medium, and the stream data and control information acquired by the processing of the acquisition step. an extraction step, the PMT extracted by the processing of the extracting step, based on whether or not includes a predetermined hierarchical transmission descriptor, look including a reproduction control step for controlling reproduction of stream data, the reproduction control step In the processing of, when the layer transmission descriptor is not included in the PMT, the reproduction of the higher layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, the reproduction of the lower layer stream data is performed. It is characterized by controlling .

The second program of the present invention extracts a predetermined PMT from an acquisition step of acquiring stream data and control information recorded on a predetermined recording medium, and the stream data and control information acquired by the processing of the acquisition step an extraction step of, in the PMT extracted by the processing of the extracting step, based on whether or not includes a predetermined hierarchical transmission descriptor, look including a reproduction control step for controlling reproduction of stream data, the reproduction control In the step processing, when the layer transmission descriptor is not included in the PMT, the reproduction of the higher layer stream data is controlled. When the layer transmission descriptor is included in the PMT, the reproduction of the lower layer stream data is performed. The computer is caused to execute a process characterized by controlling .

In the information reproducing apparatus, information reproducing method, and second program of the present invention, stream data and control information recorded on a predetermined recording medium are acquired, and a predetermined PMT is extracted from the stream data and control information. Then, the reproduction of the stream data is controlled based on whether or not the extracted PMT includes a predetermined layer transmission descriptor . Further, when the layer transmission descriptor is not included in the PMT, the reproduction of the higher layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, the reproduction of the lower layer stream data is controlled. The

The recording / reproducing apparatus of the present invention includes a first acquisition unit that acquires a broadcast signal adopting a layered transmission method, and a detection that detects information indicating a reception status of the broadcast signal acquired by the first acquisition unit. Based on the information indicating the reception status of the broadcast signal detected by the detection means, the selection means for selecting the stream data to be recorded out of the stream data included in the broadcast signal, and the broadcast detected by the detection means Based on the information indicating the signal reception status, the conversion means for converting the control information included in the broadcast signal as necessary, the stream data selected by the selection means, and the control converted by the conversion means as necessary Recording control means for controlling recording of information, second acquisition means for acquiring stream data and control information whose recording is controlled by the recording control means, and second acquisition means From a more acquired stream data and control information, extracting means for extracting a predetermined PMT, the PMT extracted by the extraction means, based on whether or not includes a predetermined hierarchical transmission descriptor, stream data e Bei and reproduction control means for controlling the reproduction, selection means, if the information indicating the reception status of detected by the detecting means broadcast signal, indicating that the reception state of the broadcast signal is good, a broadcast signal Among the stream data included in the data, the high-level stream data is selected as the stream data to be recorded, and the information indicating the reception status of the broadcast signal detected by the detection means is not good. Indicates that all stream data included in the broadcast signal is selected as stream data to be recorded. When the information indicating the reception status of the detected broadcast signal indicates that the reception status of the broadcast signal is good, predetermined information that is a hierarchical transmission descriptor is obtained from the PMT included in the control information of the broadcast signal. If the information indicating the reception status of the broadcast signal detected by the detection means is deleted and the reception status of the broadcast signal is not good, the control information included in the broadcast signal is not converted, and the reproduction control means Controls reproduction of high-level stream data when the PMT does not include a hierarchical transmission descriptor, and controls reproduction of low-level stream data when the PMT includes a hierarchical transmission descriptor. It is characterized by that.

The recording / reproducing method of the present invention includes a first acquisition step of acquiring the broadcast signal, a detection step of detecting information indicating a reception status of the broadcast signal acquired by the processing of the first acquisition step, A selection step for selecting the stream data to be recorded among the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the detection step processing, and the detection step processing Based on the information indicating the reception status of the broadcast signal detected by the conversion step of converting the control information included in the broadcast signal as necessary, the stream data selected by the processing of the selection step, A recording control step for controlling recording of the control information converted as necessary by the processing of the conversion step; A second acquisition step for acquiring the stream data and the control information whose recording is controlled by the processing of the step, and a predetermined PMT from the stream data and the control information acquired by the processing of the second acquisition step. And a reproduction control step for controlling reproduction of the stream data based on whether or not a predetermined layer transmission descriptor is included in the PMT extracted by the processing of the extraction step. In the processing of the selection step, if the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, Among the included stream data, high-level stream data is selected as the recorded stream data. If the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is not good, all the stream data included in the broadcast signal is recorded. In the process of the conversion step, the information indicating the reception status of the broadcast signal detected by the detection step processing indicates that the reception status of the broadcast signal is good. In this case, the PMT included in the control information of the broadcast signal deletes predetermined information that is a hierarchical transmission descriptor, and information indicating the reception status of the broadcast signal detected by the process of the detection step is If the reception status of the broadcast signal is not good, the control information included in the broadcast signal is not converted and the playback control step is not converted. When the layer transmission descriptor is not included in the PMT, the reproduction of the higher layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, the lower layer transmission descriptor is controlled. It controls the reproduction of stream data .

The third program of the present invention includes a first acquisition step of acquiring a broadcast signal, a detection step of detecting information indicating a reception status of the broadcast signal acquired by the processing of the first acquisition step, and a detection step Based on the information indicating the reception status of the broadcast signal detected by the processing, the selection step of selecting the stream data to be recorded from the stream data included in the broadcast signal, and the broadcast signal detected by the processing of the detection step Based on the information indicating the reception status, the control information included in the broadcast signal is converted as needed, the stream data selected by the selection step processing, and the conversion step processing is converted as necessary. A recording control step for controlling the recording of the recorded control information, and stream data whose recording is controlled by the processing of the recording control step. A second acquisition step for acquiring control information, an extraction step for extracting a predetermined PMT from the stream data and control information acquired by the processing of the second acquisition step, and a PMT extracted by the processing of the extraction step Includes a reproduction control step for controlling reproduction of stream data based on whether or not a predetermined layer transmission descriptor is included, and in the process of the selection step, the broadcast signal detected by the process of the detection step When the information indicating the reception status indicates that the reception status of the broadcast signal is good, the high-level stream data is selected as the recorded stream data from the stream data included in the broadcast signal and detected. Information indicating the reception status of the broadcast signal detected by the processing of the step indicates that the reception status of the broadcast signal is not good. If it is, the stream data included in the broadcast signal is all selected as stream data to be recorded, and in the process of the conversion step, information indicating the reception status of the broadcast signal detected by the process of the detection step is the reception of the broadcast signal. If the situation indicates that the situation is good, the predetermined information that is the hierarchical transmission descriptor is deleted from the PMT included in the control information of the broadcast signal, and the reception status of the broadcast signal detected by the process of the detection step is determined. When the information shown indicates that the reception status of the broadcast signal is not good, the control information included in the broadcast signal is not converted, and the hierarchical transmission descriptor is not included in the PMT in the process of the playback control step If the PMT contains a hierarchical transmission descriptor, the playback of the lower layer stream data is controlled. And causing the computer to execute a process characterized by:

In the recording / reproducing apparatus, the recording / reproducing method, and the third program of the present invention, a broadcast signal is acquired, information indicating the reception status of the acquired broadcast signal is detected, and the received status of the broadcast signal is determined. Based on the information indicated, the stream data to be recorded is selected from the stream data included in the broadcast signal, and the control information included in the broadcast signal is required based on the information indicating the reception status of the detected broadcast signal. The recording of the stream data converted and selected in accordance with the control information and the control information converted as necessary is controlled, the stream data and the control information for which the recording is controlled are acquired, and the acquired stream data and the control information are used. , A predetermined PMT is extracted, and stream data is reproduced based on whether or not the extracted PMT includes a predetermined hierarchical transmission descriptor. Is your. If the information indicating the reception status of the detected broadcast signal indicates that the reception status of the broadcast signal is good, high-level stream data is recorded among the stream data included in the broadcast signal. If the information indicating the reception status of the broadcast signal selected and detected as stream data indicates that the reception status of the broadcast signal is not good, the stream data in which all the stream data included in the broadcast signal is recorded If the information indicating the reception status of the broadcast signal selected and detected indicates that the reception status of the broadcast signal is good, it is a hierarchical transmission descriptor from the PMT included in the control information of the broadcast signal. If the predetermined information is deleted and the information indicating the reception status of the detected broadcast signal indicates that the reception status of the broadcast signal is not good, If the control information included in the signal is not converted and the layer transmission descriptor is not included in the PMT, the reproduction of the higher layer stream data is controlled, and if the layer transmission descriptor is included in the PMT, The reproduction of the stream data of the hierarchy is controlled.

  According to the first aspect of the present invention, information can be recorded, and in particular, since the recorded information is generated based on the information indicating the reception status of the acquired broadcast signal, the generated information is reproduced. In this case, it is possible to perform a reproduction process based on the reception status when the recorded information is received.

  According to the second aspect of the present invention, information can be reproduced, and in particular, reproduction is controlled using whether or not specific information is included in the recorded information. Reproduction processing based on the reception status at the time of information reception can be performed.

  According to the third aspect of the present invention, information can be recorded and reproduced. In particular, information to be recorded is generated based on information indicating the reception status of the acquired broadcast signal, and playback is controlled using whether or not specific information is included in the recorded information. Therefore, the recorded information can be reproduced based on the reception status at the time of reception.

  Embodiments of the present invention will be described below. The correspondence relationship between the invention described in this specification and the embodiments of the invention is exemplified as follows. This description is intended to confirm that the embodiments supporting the invention described in this specification are described in this specification. Therefore, even if there is an embodiment that is described in the embodiment of the invention but is not described here as corresponding to the invention, the fact that the embodiment is not It does not mean that it does not correspond to the invention. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in this specification. In other words, this description is for the invention described in the present specification, which is not claimed in this application, that is, for the invention that will be applied for in the future or that will appear and be added by amendment. It does not deny existence.

The recording information generating apparatus according to claim 1 (for example, an apparatus corresponding to the recording data processing unit 11 in FIG. 1) is an acquisition unit (for example, in FIG. 1) that acquires a broadcast signal adopting a hierarchical transmission method. An antenna 21), detection means (for example, C / N level detection unit 26 in FIG. 1) for detecting information (for example, C / N level) indicating the reception status of the broadcast signal acquired by the acquisition means, and detection means Selection means (for example, the stream selection unit 28 in FIG. 1) for selecting the recorded stream data from the stream data included in the broadcast signal based on the information indicating the reception status of the broadcast signal detected by the Conversion means (for example, P in FIG. 1) that converts control information (for example, information including PMT) included in the broadcast signal as necessary based on information indicating the reception status of the broadcast signal detected by the means. And a T converter unit 29), selection means, information indicating the reception status of the detected broadcast signals by detecting means, when a reception status of a broadcast signal was indicated better, it included in the broadcast signal Among the stream data, high-level stream data is selected as the stream data to be recorded, and the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good. In this case, all stream data included in the broadcast signal is selected as stream data to be recorded, and the conversion means has information indicating the reception status of the broadcast signal detected by the detection means, and the reception status of the broadcast signal is good. The predetermined information, which is the hierarchical transmission descriptor, is deleted from the PMT included in the control information of the broadcast signal and detected by the detection means. Information indicating the reception status of the broadcast signal is, if the reception state of the broadcasting signal indicates that it is not good, characterized in that it does not convert the control information included in the broadcast signal.

  A recording control unit (for example, the recording / playback control unit 53 in FIG. 1) for controlling the recording of the stream data selected by the selection unit and the control information converted by the conversion unit as necessary may be further provided. it can.

According to a third aspect of the present invention, there is provided a recording information generating method for generating recording information using a broadcast signal adopting a hierarchical transmission method (for example, an apparatus corresponding to the recording data processing unit 11 of FIG. 1). ) In the recording information generation method, the acquisition step (for example, the process of step S2 in FIG. 12) for acquiring the broadcast signal, and the information (for example, C / N level) based on the detection step (for example, the process of step S3 in FIG. 12) and the information indicating the reception status of the broadcast signal detected by the process of the detection step, the stream data included in the broadcast signal Among them, the selection step for selecting the stream data to be recorded (for example, the processing in steps S4 and S5 in FIG. 12) and the release detected by the detection step processing. A conversion step (for example, processing in steps S4 and S6 in FIG. 12) that converts control information (for example, information including PMT) included in the broadcast signal as necessary based on information indicating the reception status of the signal. In the processing of the selection step, if the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, the stream data included in the broadcast signal Among them, the high-level stream data is selected as the stream data to be recorded, and the information indicating the reception status of the broadcast signal detected by the detection step processing indicates that the reception status of the broadcast signal is not good. In this case, all stream data included in the broadcast signal is selected as stream data to be recorded, and in the process of the conversion step, the detection step is performed. If the information indicating the reception status of the broadcast signal detected by the process of (2) indicates that the reception status of the broadcast signal is good, the PMT included in the control information of the broadcast signal is used as a predetermined hierarchical transmission descriptor. When the information indicating the reception status of the broadcast signal detected by the detection step processing indicates that the reception status of the broadcast signal is not good, the control information included in the broadcast signal is not converted. It is characterized by that.

In the program according to claim 4 , the embodiment (however, an example) to which each step corresponds is the same as the recording information generation method according to claim 3 .

The information reproduction apparatus according to claim 5 (for example, an apparatus corresponding to the reproduction processing unit 13 in FIG. 1) is provided with stream data and control information (for example, the hard disk 52 in FIG. 1) recorded on a predetermined recording medium. For example, acquisition means (for example, the buffer memory 63 in FIG. 1) that acquires PMT, and extraction means (for example, FIG. 1) that extracts a predetermined PMT from the stream data and control information acquired by the acquisition means. PMT extraction unit 64) and a reproduction control means for controlling reproduction of stream data based on whether or not a predetermined layer transmission descriptor is included in the PMT extracted by the extraction means (for example, FIG. 1) It includes a reproduction control section 61) and, the reproduction control means, when did not include hierarchical transmission descriptor PMT, to control the playback of the stream data of the high hierarchy, PMT If that contained the hierarchical transmission descriptor and controlling the reproduction of the stream data in the low hierarchy.

  When the stream data whose reproduction is controlled by the reproduction control means is switched from the high-level stream data to the low-level stream data, or from the low-level stream data to the high-level stream data, the reproduction is controlled by the reproduction control means. Notification processing execution means (for example, OSD 67 in FIG. 1) for executing processing for notifying the user that the stream data to be controlled has been switched can be further provided.

The information reproduction method according to claim 7 is an information reproduction method of an information reproduction apparatus (for example, an apparatus corresponding to the reproduction processing unit 13 in FIG. 1) for reproducing information, and a predetermined recording medium (for example, FIG. 1). Acquisition step (for example, the process of step S22 in FIG. 13) for acquiring the stream data and control information (for example, information including the PMT) recorded in the hard disk 52) and the stream data acquired by the process of the acquisition step And an extraction step for extracting a predetermined PMT from the control information (for example, the processing of step S23 in FIG. 13), and whether or not the predetermined layer transmission descriptor is included in the PMT extracted by the processing of the extraction step. based on the reproduction control step for controlling reproduction of the stream data (for example, step S24 to S26 in FIG. 13) and the saw including a In the processing of the raw control step, when the layer transmission descriptor is not included in the PMT, the reproduction of the high layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, the low layer stream is controlled. Controlling data reproduction .

Also, in the program according to claim 8 , the embodiment (however, an example) to which each step corresponds is the same as the information reproducing method according to claim 11.

The recording / reproducing apparatus according to claim 9 (for example, the recording / reproducing apparatus 1 in FIG. 1) is a first obtaining unit (for example, the antenna 21 in FIG. 1) that obtains a broadcast signal adopting a hierarchical transmission method. Detection means (for example, C / N level detection unit 26 in FIG. 1) for detecting information (for example, C / N level) indicating the reception status of the broadcast signal acquired by the first acquisition means, and detection means Selection means (for example, the stream selection unit 28 in FIG. 1) for selecting the recorded stream data from the stream data included in the broadcast signal based on the information indicating the reception status of the broadcast signal detected by the Conversion means for converting control information (for example, information including PMT) included in the broadcast signal as required based on information indicating the reception status of the broadcast signal detected by the means (for example, the PMT conversion unit in FIG. 1) 2 ), Stream data selected by the selecting means, and recording control means for controlling the recording of the control information converted by the converting means as necessary (for example, the recording / playback control unit 53 in FIG. 1), and recording control means From the second acquisition means (for example, the buffer memory 63 in FIG. 1) for acquiring the stream data and the control information whose recording is controlled by the second acquisition means, and the predetermined PMT from the stream data and the control information acquired by the second acquisition means For example, the PMT extraction unit 64 in FIG. 1 and the PMT extracted by the extraction unit control reproduction of stream data based on whether or not a predetermined hierarchical transmission descriptor is included. regeneration control means (e.g., the reproduction control section 61) Bei example, selection means and the information indicating the reception status of detected by the detecting means broadcast signal, receiving a broadcast signal If the situation indicates that the situation is good, the stream data included in the broadcast signal is selected as the stream data to be recorded, and the reception status of the broadcast signal detected by the detection means is selected. If the received information indicates that the broadcast signal reception status is not good, all the stream data included in the broadcast signal is selected as stream data to be recorded, and the conversion means detects the broadcast signal detected by the detection means. When the information indicating the reception status of the broadcast signal indicates that the reception status of the broadcast signal is good, the predetermined information that is the hierarchical transmission descriptor is deleted from the PMT included in the control information of the broadcast signal, and the detection means If the information indicating the reception status of the broadcast signal detected by is indicating that the reception status of the broadcast signal is not good, it is included in the broadcast signal The control information is not converted, and the reproduction control means controls the reproduction of the high-level stream data when the PMT does not include the hierarchical transmission descriptor, and when the PMT includes the hierarchical transmission descriptor. Controlling reproduction of low-level stream data .

The recording / reproducing method according to claim 10 is a recording / reproducing method of a recording / reproducing apparatus (for example, the recording / reproducing apparatus 1 in FIG. 1) for recording / reproducing a broadcast signal adopting a hierarchic transmission method. Detecting information (for example, C / N level) indicating the reception status of the broadcast signal acquired by the first acquisition step (for example, the process of step S2 in FIG. 12) and the process of the first acquisition step. Of the stream data included in the broadcast signal based on the detection step (for example, the process of step S3 in FIG. 12) and the information indicating the reception status of the broadcast signal detected by the process of the detection step. Based on a selection step for selecting data (for example, the processing in steps S4 and S5 in FIG. 12) and information indicating the reception status of the broadcast signal detected by the processing in the detection step. The stream data selected by the conversion step (for example, the processing of steps S4 and S6 in FIG. 12) and the selection step for converting the control information (for example, information including the PMT) included in the broadcast signal as necessary. A recording control step for controlling the recording of the control information converted as necessary by the processing of the conversion step (for example, the processing of step S7 in FIG. 12), and stream data whose recording is controlled by the processing of the recording control step. And a second acquisition step of acquiring control information (for example, the process of step S22 in FIG. 13), and an extraction step of extracting a predetermined PMT from the stream data and control information acquired by the process of the second acquisition step (For example, the process of step S23 in FIG. 13) A PMT, including based on whether it contains the predetermined hierarchical transmission descriptor, the reproduction control step for controlling reproduction of the stream data (for example, step S24 to S26 in FIG. 13) and the selection In the step processing, if the information indicating the reception status of the broadcast signal detected by the detection step processing indicates that the reception status of the broadcast signal is good, the stream data included in the broadcast signal Among them, information indicating the reception status of the broadcast signal detected by the processing of the detection step is selected as the stream data to be recorded, and the reception status of the broadcast signal is not good. The stream data included in the broadcast signal is selected as the stream data to be recorded, In the process of the conversion step, when the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, the control of the broadcast signal Information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the information, and the reception status of the broadcast signal is not good. If the control information included in the broadcast signal is not converted and the PMT does not include the hierarchical transmission descriptor in the process of the reproduction control step, the higher-layer stream data And when the PMT includes the layer transmission descriptor, the playback of low layer stream data is controlled .

Also in the program according to claim 11 , the embodiment (however, an example) to which each step corresponds is the same as the information processing method according to claim 10 .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus 1 to which the present invention is applied.

  The recording / reproducing apparatus 1 includes a recording data processing unit 11, a recording unit 12, and a reproduction processing unit 13.

  The recording data processing unit 11 includes a tuner 22, a demodulation unit 23, a descrambler 24, a demultiplexer 25, a C / N level detection unit 26, a recording control unit 27, a stream selection unit 28, a PMT (Program Map Table) conversion unit 29, It comprises a multiplexer 30 and a REC-FIFO 31.

  The tuner 22 selects and extracts a broadcast signal designated by the user from the broadcast signal received by the antenna 21 based on the control signal supplied from the recording control unit 27, and supplies the selected broadcast signal to the demodulation unit 23. The demodulator 23 demodulates the broadcast signal supplied from the tuner 23, generates a transport stream, and outputs the transport stream to the descrambler 24. The descrambler 24 appropriately de-scrambles the transport stream supplied from the demodulator 23 and outputs the descrambler 24 to the demultiplexer 25. The demultiplexer 25 separates the multiplexed transport stream into stream data such as video or audio data and section data, supplies the stream data to the stream selection unit 28, and sends the section data to the PMT conversion unit 29. Supply. The section data supplied to the PMT conversion unit 29 includes PAT (Program Association Table), PMT (Program Map Table), NIT (Network Information Table), CAT ( Tables such as “Conditional Access Table” are included.

  The C / N level detection unit 26 acquires the C / N level (carrier-to-noise ratio) in the broadcast signal acquired by the tuner 22 and supplies it to the recording control unit 27. The recording control unit 27 controls the entire processing of the recording data processing unit 11. For example, the recording control unit 27 is based on information indicating a user's operation input supplied via the reproduction control unit 61 of the reproduction processing unit 13. The tuner 22 is controlled to select and receive the broadcast signal of the channel designated by the user, or the stream selection unit 28 is controlled based on the C / N level supplied from the C / N level detection unit 26. Then, the elementary stream (hereinafter, also referred to as ES) recorded by the recording unit 12 is selected, or the PMT conversion unit 29 is controlled so that the description of the PMT recorded by the recording unit 12 can be changed as necessary. Convert.

  When the broadcast signal received by the antenna 21 is a broadcast signal in which hierarchical modulation operation is defined, such as BS digital broadcast or broadband CS digital broadcast, the recording control unit 27 supplies from the C / N level detection unit 26. Based on the detected C / N level result, the selection of the elementary stream by the stream selection unit 28 is controlled, and the conversion of the PMT by the PMT conversion unit 29 is controlled. That is, the recording control unit 27 controls the generation of information to be recorded in the recording unit 12 in the received broadcast signal.

  Based on the control of the recording control unit 27, the stream selection unit 28 selects an elementary stream to be recorded in the recording unit 12 from the supplied elementary streams and supplies the selected elementary stream to the multiplexer 30. Specifically, based on the control of the recording control unit 27, the stream selection unit 28, when the C / N level is higher than a predetermined value, that is, when the reception level is good, the high-level video and audio The elementary stream is selected as an elementary stream to be recorded in the recording unit 12 and supplied to the multiplexer 30. When the C / N level is lower than a predetermined value, that is, when the reception level is not good, all received The video and audio elementary streams are selected as elementary streams to be recorded in the recording unit 12 and supplied to the multiplexer 30.

  In order to determine whether or not the reception level is good, the threshold of the C / N level (predetermined value described above) is a value that is appropriately set experimentally or empirically.

  The PMT conversion unit 29 converts the supplied PMT as necessary based on the control of the recording control unit 27 and supplies the converted PMT to the multiplexer 30. Specifically, based on the control of the recording control unit 27, the PMT conversion unit 29, from the PMT, determines the hierarchical transmission descriptor when the C / N level is higher than a predetermined value, that is, when the reception level is good. And the converted PMT is supplied to the multiplexer 30. When the C / N level is lower than a predetermined value, that is, when the reception level is not good, the PMT is not converted (hierarchical transmission descriptor). Are supplied to the multiplexer 30.

  The multiplexer 30 multiplexes the signals supplied from the stream selection unit 28 and the PMT conversion unit 29 and supplies the multiplexed signals to the REC-FIFO 31.

  The REC-FIFO 31 is a memory that performs a first (first in first out) operation of a recording signal. The REC-FIFO 31 temporarily stores the supplied signal and processes the signal in the order of input in the hard disk recording / reproducing process of the recording unit 12. This is output to the unit 51.

  In the description of the stored data processing unit 22, the compression encoding method of the broadcast signal received by the antenna 21 and the compression encoding method when the recording unit 12 records on the hard disk are, for example, ISO / IEC ( The case of the same format according to the MPEG-2 (moving picture experts group-2) standard defined by the International Organization for Standardization / International Electrotechnical Commission) is described as an example. If the compression encoding method of the broadcast signal is different from the compression encoding method used when recording on the hard disk in the recording unit 12, the recording data processing unit 11 includes a decoding unit and an encoding unit (or format conversion). Needless to say, the processing unit) may be provided as appropriate.

  Next, the recording unit 12 includes a hard disk recording / reproduction processing unit 51, a hard disk 52, and a recording / reproduction control unit 53.

  Under the control of the recording / reproduction control unit 53, the hard disk recording / reproduction processing unit 51 divides the recording broadcast signal supplied from the recording data processing unit 11 based on the sector size, and supplies the divided broadcast signal to the hard disk 52 for recording. Or reading a predetermined signal recorded in the hard disk 52, correcting the signal amplification, frequency response characteristics, etc., and supplying the signal to the buffer memory 63 of the reproduction processing unit 13. The hard disk 52 records the broadcast signal for recording supplied from the hard disk recording / playback processing unit 51.

  The recording / playback control unit 53 controls processing executed by the recording unit 12 based on a control signal supplied from the playback processing unit 61 of the playback processing unit 13, and controls the hard disk recording / playback processing unit 51. The broadcast signal for recording is recorded on the hard disk 52, and the broadcast signal that the user commands to reproduce is read out from the broadcast signals recorded on the hard disk 52 and supplied to the buffer memory 63 of the reproduction processing unit 13. .

  Here, it has been described that the broadcast signal for recording is recorded on the hard disk 52 and the broadcast signal recorded on the hard disk 52 is read, but the broadcast signal for recording is recorded on various removable recording media. It goes without saying that it may be possible to do so.

  Next, the reproduction processing unit 13 includes a reproduction control unit 61, an operation input unit 62, a buffer memory 63, a PMT extraction unit 64, a stream selection unit 65, an MPEG decoder 66, an OSD (On Screen Display) 67, and an audio signal processing unit 68. , A D / A converter 69, a video signal processor 70, a D / A converter 71, and a drive 72.

  The reproduction control unit 61 controls the entire processing of the reproduction processing unit 13. For example, the reproduction control unit 61 controls the stream selection unit 65 based on the PMT of the reproduction signal extracted by the PMT extraction unit 64 to reproduce the reproduction. A predetermined message to the user is displayed on the displayed video signal by controlling the elementary stream. Specifically, when the playback signal PMT extracted by the PMT extraction unit 64 does not include a layer transmission descriptor, the playback control unit 61 corresponds to a higher layer of the elementary stream included in the playback signal. The stream selection unit 65 is controlled to output the supplied elementary stream as it is, and when the hierarchical transmission descriptor is included in the PMT of the playback signal, it is included in the playback signal. It is determined that the elementary streams to be received are both those corresponding to the high hierarchy expected to have poor quality and those corresponding to the low hierarchy, and the stream selection unit 65 is controlled to control the stream from the supplied elementary streams. In addition to selecting an elementary stream corresponding to the lower layer, the PMT of the reproduction signal includes a portion including the layer transmission descriptor. It is the switching point of the had not portion controls the OSD67, and messages for notifying the user that has been switched elementary stream to be reproduced, is displayed superimposed on the image.

  Further, the reproduction control unit 61 not only controls the entire processing of the reproduction processing unit 13 but also, based on the user's operation input input by the operation input unit 62, the recording data processing unit 11 or The operation of the recording unit 12 is controlled.

  The operation input unit 62 includes, for example, a button, a key, a touch pad, or a receiving unit that receives a wireless signal such as infrared rays supplied from a remote commander. The operation input unit 62 receives a user operation input and indicates the operation input. The signal is supplied to the reproduction control unit 61.

  The buffer memory 63 is a memory for temporarily recording the reproduction signal supplied from the recording unit 12, and supplies the temporarily recorded reproduction signal to the PMT extraction unit 64. The PMT extraction unit 64 extracts the PMT from the supplied reproduction signal, supplies the PMT to the reproduction control unit 61, and supplies the elementary stream to the stream selection unit 65.

  Based on the control of the playback control unit 61, the stream selection unit 65 selects an output stream from the supplied elementary streams and supplies the selected stream to the MPEG decoder 66. The MPEG decoder 66 decodes the supplied reproduction signal, and supplies the audio signal to the audio signal processing unit 68 and the video signal to the video signal processing unit 70.

  The OSD 67 supplies a message to be displayed to be superimposed on the video signal to the video signal processing unit 70 based on the control of the playback control unit 61.

  The audio signal processing unit 68 receives the audio data decoded by the MPEG decoder 66, performs predetermined processing such as noise removal and amplification, and supplies the processed data to the D / A conversion unit 69. The D / A conversion unit 69 converts the supplied digital audio data into an analog signal, which is supplied to, for example, a television receiver or an external speaker to output the audio.

  The video signal processing unit 70 receives the video data decoded by the MPEG decoder 66, performs predetermined processing such as conversion to an NTSC format signal, and superimposes the data supplied from the OSD 67 as necessary. , Supplied to the D / A converter 71. The D / A conversion unit 71 converts the supplied digital video data into an analog signal, and supplies it to, for example, a television receiver or an external monitor for display.

  When the magnetic disk 81, the optical disk 82, the magneto-optical disk 83, the semiconductor memory 84, or the like is mounted, the drive 72 drives them to acquire programs and data recorded therein. The acquired program and data are transferred to the reproduction control unit 61 and executed by the reproduction control unit 61 as necessary.

  Next, a broadcast signal corresponding to hierarchical modulation recorded and reproduced in the recording / reproducing apparatus 1 described with reference to FIG. 1 will be described.

  Hierarchical modulation is intended to continue presenting services as much as possible when the reception level drops, such as during rain. ARIB (Association of Radio Industries and Businesses) TR-B15, Volume 7, “7.1 Hierarchical Modulation” In Operation, it is defined as follows.

(1) A method for improving a service time rate at a low C / N level by using different modulation methods for components in one service is defined as hierarchical modulation.
(2) Hierarchical modulation is limited to services between two types of modulation schemes (between hierarchies) within a TS (transport stream).
(3) A combination of modulation schemes with a large required C / N level difference as much as possible within a range where the reduction in coding efficiency is small is recommended.
(4) A layer in which information to be transmitted using TC8PSK flows is set as a high layer. On the other hand, using other modulation schemes with low frequency utilization efficiency, a hierarchy in which information that can be received even at a low C / N level flows is set as a low hierarchy.
(5) When components of the same type exist in different layers (for example, a high-layer video and a low-layer video), switching is performed according to the reception state with reference to the mutual elementary stream in the layer transmission descriptor.
(6) By using different modulation schemes for each TS or service, when a plurality of modulation schemes are used within one carrier, they are not called hierarchical modulation.

  An example of an elementary stream included in a broadcast signal in a broadcast signal to which hierarchical modulation is applied, that is, an elementary stream supplied to the stream selection unit 28 will be described with reference to FIGS. In FIG. 2 to FIG. 4, the arrows described in the drawings indicate reference destination elementary streams, and the reference destination elementary streams are elementary streams of other layers corresponding to the reference destination elementary streams.

  The first pattern of the elementary stream included in the broadcast signal in the broadcast signal to which the hierarchical modulation is applied is as shown in FIG. 2 in the elementary stream included in the broadcast signal to which the hierarchical modulation is applied. The lower hierarchy video 2 is associated with the higher hierarchy video 1, and the lower hierarchy audio 2 is associated with the higher hierarchy audio 1. In this case, in a state where the C / N level is higher than a certain level (a state where the reception strength is sufficient), the video 1 and the audio 1 are viewed, and the C / N level is lowered to a certain level or lower. When the value is reached, the video 2 and the audio 2 are viewed. When the C / N level is lower than a certain level (a state where the reception strength is not sufficient), and when the C / N level is higher than a certain level, the broadcast signal to be viewed is again the video 1 and the audio. It is made to become 1.

  As shown in FIG. 3, the second pattern of the elementary stream included in the broadcast signal in the broadcast signal to which the hierarchical modulation is applied is the following in the elementary stream included in the broadcast signal to which the hierarchical modulation is applied: The lower hierarchy video 2 is associated with the higher hierarchy video 1, and the lower hierarchy video 2 is also associated with the higher hierarchy video 3. The audio | voice 2 of a hierarchy is matched. In this case, in a state where the C / N level is higher than a certain level (a state where the reception intensity is sufficient), the video 1 and the audio 1 or the video 3 and the audio 1 are viewed. When the level decreases and becomes a certain value or less, video 2 and audio 2 are viewed. Then, when the C / N level is returned to a state where the C / N level is higher than a certain level from a state where the C / N level is lower than a certain level (a state where the reception strength is not sufficient), the broadcast signal to be viewed again Regardless of whether the C / N level is viewed in a state higher than a certain level or the C / N level being viewed in a state higher than a certain level, the video 2 becomes a reference destination. Depending on the specifications of the device that receives the broadcast signal, which method is adopted may be the video 1 that is the reference destination of the audio 2 and the audio 2 that is the reference destination of the audio 2. Dependent.

  As shown in FIG. 4, the third pattern of the elementary stream included in the broadcast signal in the broadcast signal to which the hierarchical modulation is applied is as follows. The lower hierarchy video 1 is associated with the higher hierarchy video 1, and the audio signal is not associated with the higher hierarchy audio 1. In this case, in a state where the C / N level is higher than a certain level (a state where the reception strength is sufficient), the video 1 and the audio 1 are viewed, and the C / N level is lowered to a certain level or lower. When the value is reached, video 2 is displayed, but no audio signal is provided. Then, when the C / N level returns from a state where the C / N level is lower than a certain level (a state where the reception strength is not sufficient) to a state where the C / N level is higher than a certain level, the broadcast signal to be viewed is broadcast again. The signal is again video 1 and audio 1.

  The recording control unit 27 in FIG. 1 controls the stream selection unit 28 when the C / N level supplied from the C / N level detection unit 26 is higher than a predetermined value, that is, when the reception status is good. Then, the video data and audio data corresponding to the higher hierarchy are selected as elementary streams recorded by the recording unit 12, and the C / N level supplied from the C / N level detection unit 26 is higher than a predetermined value. When the reception level is low, that is, when the reception status is not good, the stream selection unit 28 is controlled to record both the video data and audio data corresponding to the high hierarchy and the video data and audio data corresponding to the low hierarchy. Are selected as elementary streams to be recorded.

  In the broadcast signal, related information such as the reference destination of the elementary stream described with reference to FIGS. 2 to 4 is described in the hierarchical transmission descriptor of the PMT. The recording control unit 27 in FIG. 1 controls the stream selection unit 28 according to the C / N level supplied from the C / N level detection unit 26 to select the elementary stream recorded by the recording unit 12. At the same time, the PMT is appropriately converted in accordance with the recorded elementary stream.

  Next, the PMT will be described with reference to FIGS. FIG. 5 is a diagram illustrating the structure of the PMT section in the section data supplied to the PMT conversion unit 29.

  Table_id (8 bits) is information indicating the type of section (table), and here, information indicating the PMT is described. The section_syntax_indicator (1 bit) is information indicating whether the section header is in a long form or a short form. reserved is a flag to be given in the future (the same applies hereinafter). The section_length (12 bits) is information indicating the section length in bytes from immediately after this to the end of the section (including a CRC (Cyclic Redundancy code) code if any).

  version_number (5 bits) indicates the version of the PMT, and is incremented by 1 each time the contents of the PMT are updated. The current_next_indicator (1 bit) indicates which version the PMT has when transmitting the old and new versions simultaneously. section_number (8 bits) indicates a section number. The section number of the first section is “0x00”, and in subsequent sections, it is incremented by 1 for each section. last_section_number (8 bits) is information indicating the section number of the last section of the same sub-table. PCR_PID (3 bits) is a packet ID of a transport packet that transmits a PCR (Program Clock Reference) written in the contents of the new PMT. program_info_length (12 bits) is information that defines the number of bytes of the descriptor immediately following this field. The descriptor is a descriptor in which information that complements the section contents is described.

  The stream_type (8 bits) indicates the type of signal to which the stream is transmitted, such as video, audio, or data. elementary_PID (13 bits) indicates the PID of the elementary stream. ES_info_length (12 bits) defines the length (number of bytes) of the descriptor of the related elementary stream immediately following this field. In the descriptor, a hierarchical transmission descriptor having a structure described later with reference to FIG. 6 is described. The hierarchical transmission descriptor describes the relationship between hierarchized streams in hierarchical transmission. Further, stream_type, elementary_PID, ES_info_length, and descriptor are information that is repeatedly described.

  A CRC (Cyclic Redundancy code) 32 is written in the last 32 bytes to detect a frame error.

  FIG. 6 is a diagram illustrating a structure of a hierarchical transmission descriptor described in the PMT.

  The descriptor_tag is information for indicating the type of descriptor (identifying the descriptor). descriptor_length specifies the total byte length of the data part described below. The quality_level is information indicating whether the corresponding elementary stream is a stream corresponding to a high hierarchy or a stream corresponding to a low hierarchy. For example, when quality_level = 1, the quality_level = 0. In this case, it can be assumed that the hierarchy is low. The reference_PID is information indicating the reference destination elementary stream described with reference to FIGS.

  A specific description example of the PMT will be described with reference to FIG.

  Descriptor is described following the information of table_id to program_info_length described with reference to FIG. First, since stream_type = 0x02 is described in the first elementary stream, the type of elementary stream represented by this descriptor is MPEG2 VIDEO, 0x0100 is described as elementary_PID, and ES_info_length The length of this elementary stream is described, followed by a stream identification descriptor, this elementary stream is identified with component_tag = 0x00, a hierarchical transmission descriptor is described, and quality_level = 1 indicates that this elementary stream is a higher layer, and reference_PID = 1x0101 specifies the PID of the elementary stream referenced by this elementary stream.

  Since the second elementary stream describes stream_type = 0x02, the type of elementary stream is MPEG2 VIDEO, 0x0101 is described as elementary_PID, and the length of this elementary stream is described in ES_info_length. Followed by a stream identification descriptor, this elementary stream is identified with component_tag = 0x01, a layered transmission descriptor is described, and this elementary stream is described with quality_level = 0 The lower layer is indicated, and reference_PID = 1x0100 designates the PID of the elementary stream to which this elementary stream refers.

  Since the third elementary stream describes stream_type = 0x02, the type of elementary stream is MPEG2 VIDEO, 0x0200 is described as elementary_PID, and the length of this elementary stream is described in ES_info_length. Followed by a stream identification descriptor, this elementary stream is identified with component_tag = 0x10, a hierarchical transmission descriptor is described, and this elementary stream with quality_level = 1 A high layer is indicated, and reference_PID = 1x0201 specifies the PID of the elementary stream to which this elementary stream refers.

  Since the fourth elementary stream describes stream_type = 0x02, the type of elementary stream is MPEG2 VIDEO, 0x0201 is described as elementary_PID, and the length of this elementary stream is described in ES_info_length. Followed by a stream identification descriptor, and this elementary stream is identified with component_tag = 0x11, a hierarchical transmission descriptor is described, and quality_level = 0, this elementary stream is The lower layer is indicated, and reference_PID = 1x0200 designates the PID of the elementary stream to which this elementary stream refers.

  Finally, CRC32 is described.

  An outline of the elementary stream corresponding to the PMT described with reference to FIG. 7 will be described with reference to FIG.

  The elementary stream of PID0x0100 is a video ES (elementary stream), identified by component_tag = 0x00, and the reference elementary stream is the video ES of PID0x0101.

  The elementary stream with PID0x0200 is an audio ES, identified by component_tag = 0x10, and the reference destination elementary stream is an audio ES with PID0x0201.

  The elementary stream of PID0x0101 is a video ES (elementary stream), identified by component_tag = 0x01, and the reference destination elementary stream is a video ES of PID0x0100.

  The elementary stream of PID0x0201 is an audio ES, identified by component_tag = 0x11, and the reference destination elementary stream is an audio ES of PID0x0200.

  The broadcast wave shown in FIG. 8 is transmitted, and the C / N level of the broadcast wave received by the tuner 22 has a detection result by the C / N level detection unit 26 equal to or greater than a predetermined value, that is, reception of the broadcast wave. When the situation is good, the recording control unit 27 controls the PMT conversion unit 29 to delete the description of the portion corresponding to the lower layer elementary stream and the layer transmission descriptor from the PMT. Therefore, when the C / N level of the received broadcast wave is equal to or higher than a predetermined value, the PMT conversion unit 29 reads from the PMT described with reference to FIG. 7 a description of the portion corresponding to the lower-layer elementary stream. , The description of the hierarchical transmission descriptor is deleted, changed as shown in FIG.

  When the C / N level of the received broadcast wave is equal to or higher than a predetermined value, the recording control unit 27 controls the stream selection unit 28 to select an elementary stream corresponding to a higher hierarchy. That is, the stream selection unit 28 selects the PID0x0100 elementary stream and the PID0x0200 elementary stream corresponding to the high hierarchy from the high hierarchy and low hierarchy elementary streams described with reference to FIG. To do.

  On the other hand, the detection result by the C / N level detection unit 26 of the C / N level of the broadcast wave transmitted by the tuner 22 and transmitted by the tuner 22 is equal to or less than a predetermined value, that is, the broadcast wave When the reception status is poor, the recording control unit 27 controls the PMT conversion unit 29 so that the hierarchical transmission descriptor is not deleted from the PMT and is supplied to the multiplexer 30 in the PMT state shown in FIG.

  If the C / N level of the received broadcast wave is greater than or equal to a predetermined value, the recording control unit 27 controls the stream selection unit 28 to select all received elementary streams. That is, the stream selection unit 28 selects all the high-level and low-level elementary streams described with reference to FIG. However, since the elementary stream corresponding to the high hierarchy has a poor reception status, there is a high possibility that an error packet has occurred, and it cannot withstand reproduction output.

  Then, the broadcast wave shown in FIG. 8 is transmitted and recorded in a state where the detection result by the C / N level detection unit 26 of the C / N level of the broadcast wave received by the tuner 22 is equal to or greater than a predetermined value. When the elementary stream is reproduced, the PMT extracted by the PMC extraction unit 64 does not include a hierarchical transmission descriptor. Therefore, the reproduction control unit 61 determines that the reproduction signal has a C / N level of a predetermined value. It can be recognized that the stream is an elementary stream recorded in the above state. Accordingly, the playback control unit 61 causes the stream selection unit 65 to supply the supplied elementary stream, that is, only the elementary stream corresponding to the higher hierarchy, to the MPEG decoder 66 as it is.

  Also, the broadcast wave shown in FIG. 8 is transmitted and recorded in a state where the detection result by the C / N level detection unit 26 of the C / N level of the broadcast wave received by the tuner 22 is equal to or less than a predetermined value. When the elementary stream is reproduced, since the PMT extracted by the PMC extraction unit 64 includes a hierarchical transmission descriptor, the reproduction control unit 61 determines that the reproduction signal has a C / N level having a predetermined value. It can be recognized that this is an elementary stream recorded in the following state. Therefore, the playback control unit 61 causes the stream selection unit 65 to select only the elementary stream corresponding to the lower hierarchy from the supplied elementary streams and supply the selected stream to the MPEG decoder 66.

  Further, the OSD 67 is controlled at the switching point of whether or not the hierarchical transmission descriptor is included in the PMT extracted by the PMC extracting unit 64, and the C / N level is reduced in the displayed video data, or A message for notifying that the quality of the reproduced video and audio has been changed due to the return is superimposed on the displayed video data.

  The PMT and elementary stream to be recorded and the elementary stream to be presented when the PMC corresponding to the elementary stream shown in FIG. 8 is received will be described with reference to FIG.

  If the C / N level at the time of recording is equal to or higher than a predetermined value and the reception state is good, the recorded PMT does not include a hierarchical transmission descriptor, and the recorded video ES (elementary stream) is recorded. ) Is 0x0100, the PID of the recorded audio ES is 0x0200, the PID of the video ES presented during playback is 0x0100, and the PID of the audio ES presented during playback is 0x0200 is there.

  If the C / N level at the time of recording has dropped below a predetermined value, the recorded PMT includes a hierarchical transmission descriptor, and the PID of the recorded video ES is 0x0100. And 0x0101, the PID of the recorded audio ES is 0x0200 and 0x0201, the PID of the video ES presented at the time of reproduction is 0x0101, and the PID of the audio ES presented at the time of reproduction is 0x0201.

  When the C / N level at the time of recording returns to a predetermined value or higher again, the recorded PMT does not include a hierarchical transmission descriptor, and the PID of the recorded video ES is 0x0100. Yes, the PID of the recorded audio ES is 0x0200, the PID of the video ES presented at the time of reproduction is 0x0100, and the PID of the audio ES presented at the time of reproduction is 0x0200.

  When the elementary stream presented due to the change in the C / N level at the time of recording is changed, the quality of the video and audio being played back to the user is reduced due to the decrease or return of the C / N level. A message for notifying that the change has been made is superimposed on the displayed video data, so that the user is presented with an elementary stream with inferior quality or why no elementary stream is presented It is possible to grasp the status of the reproduction signal, such as whether it has been presented or why it has been presented again.

  Next, the broadcast signal reception recording process will be described with reference to the flowchart of FIG.

  In step S1, the recording control unit 27 of the recording data processing unit 11 of the recording / reproducing apparatus 1 receives a broadcast signal from the user by the operation input unit 62 based on the signal supplied via the reproduction control unit 61. It is determined whether or not an operation input commanding recording is received. If it is determined in step S1 that the operation input commanding the reception and recording of the broadcast signal has not been received, the process of step S1 is repeated until it is determined that the reception and recording of the broadcast signal has been commanded.

  If it is determined in step S1 that an operation input commanding reception and recording of a broadcast signal has been received, the recording control unit 27 controls each unit of the recording data processing unit 11 in step S2. The broadcast signal received by 21 is acquired and selected, and thereafter, the demodulator 23, the descrambler 24, and the demultiplexer 25 process the received signal as described above.

  In step S <b> 3, the C / N level detection unit 26 detects the C / N level of the broadcast wave acquired by the tuner and supplies the detection result to the recording control unit 27.

  In step S4, the recording control unit 27 determines whether or not the C / N level of the broadcast wave detected by the C / N level detection unit 26 is greater than or equal to a predetermined value.

  When it is determined in step S4 that the C / N level of the broadcast wave is equal to or higher than a predetermined value, the recording control unit 27 controls the stream selection unit 28 and is supplied from the demultiplexer 25 in step S5. Among the video and audio ESs (elementary streams), a higher-level ES is selected. Based on the control of the recording control unit 27, the stream selection unit 28 selects a high-level ES, deletes a low-level ES, and supplies the ES to the multiplexer 30.

  In step S6, the recording control unit 27 controls the PMT conversion unit 29 to rewrite the PMT and delete the transmission descriptor. Based on the control of the recording control unit 27, the PMT conversion unit 29 rewrites the supplied PMT, deletes the transmission descriptor, and supplies it to the multiplexer 30.

  If it is determined in step S4 that the C / N level of the broadcast wave is not equal to or higher than a predetermined value, or after the processing in step S6 is completed, the multiplexer 30 multiplies the supplied ES and PMT in step S7. Plex and supply to REC-FIFO 31. The REC-FIFO 31 temporarily holds the supplied signal and then supplies the signal to the hard disk recording / playback processing unit 51 of the recording unit 12. The hard disk recording / playback processing unit 51 supplies the processed broadcast signal and PMT supplied from the REC-FIFO 31 to the hard disk 52 for recording.

  In step S8, the recording control unit 27 determines whether or not the recording of the broadcast signal is terminated. If it is determined in step S8 that recording of the broadcast signal is not completed, the process returns to step S2, and the subsequent processes are repeated. If it is determined in step S8 that the recording of the broadcast signal is finished, the process is finished.

  By such processing, when a broadcast wave corresponding to hierarchical modulation is recorded, the recorded signal is deleted or changed as necessary according to the C / N level. That is, when the signal is reproduced, the elementary stream to be reproduced is controlled according to the C / N level at the time of receiving the recording signal, and the user can be notified when switching to a different layer. A simple recording signal can be generated and recorded.

  Next, the reproduction processing of the recorded broadcast signal will be described with reference to the flowchart of FIG.

  In step S <b> 21, the reproduction control unit 61 determines whether an operation input for instructing reproduction of the broadcast signal recorded in the recording unit 12 has been received from the user based on the signal supplied from the operation input unit 62. . If it is determined in step S21 that an operation input commanding reproduction of the broadcast signal has not been received, the process of step S21 is repeated until it is determined that an operation input commanding reproduction of the broadcast signal has been received.

  If it is determined in step S21 that an operation input for instructing reproduction of the broadcast signal has been received, in step S22, the reproduction control unit 61 sends the recorded broadcast signal designated by the user to the recording / reproduction control unit 53. A control signal for instructing to read out is output. The recording / playback control unit 53 controls the hard disk recording / playback processing unit 51 to read a broadcast signal designated by the user recorded on the hard disk 51 and supply the broadcast signal to the buffer memory 63. The buffer memory 63 supplies the supplied broadcast signal, that is, the reproduction signal, to the PMT extraction unit 64.

  In step S <b> 23, the PMT extraction unit 64 extracts the PMT from the supplied reproduction signal and supplies it to the reproduction control unit 61. In addition, the PMT extraction unit 64 supplies an elementary stream (ES) in the supplied reproduction signal to the stream selection unit 65.

  In step S24, the reproduction control unit 61 determines whether or not a layer transmission descriptor is described in the PMT supplied from the PMT extraction unit 64.

  If it is determined in step S24 that the hierarchical transmission descriptor is described in the PMT, in step S25, the playback control unit 61 controls the stream selection unit 65 to reduce the low level among the supplied elementary streams. A hierarchical elementary stream (ES) is selected. The stream selection unit 65 selects a lower-layer elementary stream from the supplied elementary streams according to the control of the reproduction control unit 61, and supplies it to the MPEG decoder 66.

  If it is determined in step S24 that the layer transmission descriptor is not described in the PMT, the reproduction control unit 61 controls the stream selection unit 65 in step S26 so that the supplied elementary stream is directly used. In other words, the high-level elementary stream (ES) is selected. The stream selection unit 65 selects the supplied elementary stream, that is, a high-level elementary stream under the control of the playback control unit 61, and supplies the selected elementary stream to the MPEG decoder 66.

  After the processing of step S25 or step S26, in step S27, the playback control unit 61 determines whether or not the description of the PMT hierarchical transmission descriptor supplied from the PMT extraction unit 64 has been switched. The state where the hierarchical transmission descriptor is described in the PMT is switched to the state where the hierarchical transmission descriptor is not described in the PMT, or the hierarchical transmission descriptor is described in the PMT from the state where the hierarchical transmission descriptor is not described. It is determined whether the state has been switched to a certain state, or whether the PMT remains in a state where a hierarchical transmission descriptor is described or remains in a state where no hierarchical transmission descriptor is described.

  If it is determined in step S27 that the presence or absence of the description of the PMT hierarchical transmission descriptor has been switched, in step S28, the reproduction control unit 61 performs the MPEG decoder 66, the audio signal processing unit 68, the D / A conversion unit 69, and the video. The signal processing unit 70 and the D / A conversion unit 71 are controlled so that the reproduction signal is appropriately processed, the processed broadcast signal is reproduced and output, and the OSD 67 is controlled to control the hierarchy of the reproduced broadcast signal. A message for notifying the switching is superimposed on the video signal processed by the video signal processing unit 70, and the user is notified that the hierarchy of the broadcast signal to be reproduced has been switched.

  When it is determined in step S27 that the presence / absence of the description of the hierarchical transmission descriptor of the PMT has not been switched, in step S29, the reproduction control unit 61 performs the MPEG decoder 66, the audio signal processing unit 68, and the D / A conversion unit 69. Then, the video signal processing unit 70 and the D / A conversion unit 71 are controlled to appropriately process the reproduction signal and reproduce and output the processed broadcast signal (the notification message is not superimposed on the video signal).

  After the process of step S28 or step S29 is completed, in step S30, the reproduction control unit 61 determines whether or not the reproduction signal reproduced by the recording unit 12 and supplied to the buffer memory 63 ends, or the operation input unit 62. It is determined whether or not the reproduction of the recorded broadcast signal is ended based on whether or not the end of the reproduction is instructed by the signal supplied from. If it is determined in step S30 that the reproduction of the recorded broadcast signal is not completed, the process returns to step S22, and the subsequent processes are repeated. If it is determined in step S30 that the reproduction of the recorded broadcast signal is to be terminated, the processing is terminated.

  By such processing, when reproducing a broadcast wave recorded corresponding to hierarchical modulation, the elementary stream reproduced in accordance with the C / N level at the time of reception of the recording signal is controlled, and the different hierarchy is used. When switching, the user can be notified.

  Therefore, when the quality of the reproduction signal is switched, the user can recognize that the cause is a change in the C / N level when the recording signal is received.

  Here, the case where the recording of the broadcast signal and the reproduction of the recorded broadcast signal are executed in the recording / reproducing apparatus 1 which is one apparatus has been described. However, the processing of the recorded broadcast signal and the recording of the broadcast signal are described. The present invention can also be applied to the case where the processing of the signal to be reproduced is executed by different devices, or when some of the processing is executed by different devices. That is, for example, a recording data processing device having the same function as the recording data processing unit 11, an information recording device having the same function as the recording unit 12, and a data reproducing device having the same function as the reproduction processing unit 13, respectively. The present invention can be applied even when the apparatus is provided as a different device.

  Also, here, when recording a broadcast signal adopting the hierarchical transmission method, it is determined whether the reception condition is good or not according to the C / N level at the time of reception. In addition to the C / N level, the reception bit error rate may be used as a determination material for determining the reception status, or the reception status may be determined using other methods.

  Here, when recording a broadcast signal adopting the layered transmission method, it is determined whether or not to delete the layered transmission descriptor described in the PMT according to the C / N level at the time of reception. However, in the case of reproducing recorded data, it is described that the elementary stream to be reproduced and output is determined based on whether or not the hierarchical transmission descriptor is described in the PMT. Depending on the / N level, other information that is described in the PMT and that does not interfere with the deletion may be deleted as necessary, or predetermined information other than the PMT may be deleted. Of the (for example, any table information), specific information that does not hinder the deletion may be deleted as necessary. Then, at the time of reproduction, an elementary stream to be reproduced and output may be determined based on whether or not specific information is described in predetermined information (for example, any table information).

  The series of processes described above can also be executed by software. The software is a computer in which the program constituting the software is incorporated in dedicated hardware, or various functions can be executed by installing various programs, for example, a general-purpose personal computer For example, it is installed from a recording medium.

  As shown in FIG. 1, the recording medium is distributed to provide a program to a user separately from a computer, and includes a magnetic disk 41 or 81 (including a flexible disk) on which a program is recorded, an optical disk 42 or 82 (including CD-ROM (Compact Disk-Read Only Memory), DVD (Digital Versatile Disk)), magneto-optical disk 43 or 83 (including MD (Mini-Disk) (trademark)), or semiconductor memory 44 or 84 It consists of package media consisting of etc.

  Further, in the present specification, the step of describing the program recorded on the recording medium is not limited to the processing performed in chronological order according to the described order, but may be performed in parallel or It also includes processes that are executed individually.

It is a block diagram which shows the structure of the recording / reproducing apparatus to which this invention is applied. It is a figure for demonstrating the broadcast signal as which the hierarchical transmission system is employ | adopted. It is a figure for demonstrating the broadcast signal as which the hierarchical transmission system is employ | adopted. It is a figure for demonstrating the broadcast signal as which the hierarchical transmission system is employ | adopted. It is a figure which shows the structure of a PMT section. It is a figure which shows the structure of a hierarchy transmission descriptor. It is a figure which shows the specific description example. It is a figure for demonstrating the broadcast signal to which the hierarchical transmission system corresponding to FIG. 7 is employ | adopted. It is a figure which shows the example of PMT recorded from which the hierarchy transmission descriptor was deleted. It is a figure which shows the example of PMT recorded without the hierarchy transmission descriptor being deleted. It is a figure for demonstrating the relationship between CN level at the time of video recording, and the information recorded / reproduced. It is a flowchart for demonstrating a broadcast signal reception recording process. It is a flowchart for demonstrating the reproduction | regeneration processing of the recorded broadcast signal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Recording / reproducing apparatus, 11 Recording data processing part, 12 Recording part, 13 Playback processing part, 21 Antenna, 26 C / N level detection part, 27 Recording control part, 28 Stream selection part, 29 PMT conversion part, 51 Hard disk recording / reproduction Processing unit, 52 hard disk, 53 recording / playback control unit, 61 playback control unit, 42 operation input unit, 63 buffer memory, 64 PMT extraction unit, 65 stream selection unit, 67 OSD

Claims (11)

An acquisition means for acquiring a broadcast signal adopting a layered transmission method;
Detecting means for detecting information indicating a reception status of the broadcast signal acquired by the acquiring means;
Selection means for selecting the stream data to be recorded among the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the detection means;
Based on the information indicating the reception status of said detected broadcasting signal by the detecting means, Bei give a conversion means for converting optionally the control information included in the broadcast signal,
When the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is good, the selection unit includes the stream data included in the broadcast signal. The high-level stream data is selected as the recorded stream data, and the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good. The stream data included in the broadcast signal is selected as the recorded stream data,
If the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is good, the conversion means is included in the control information of the broadcast signal When predetermined information which is a hierarchical transmission descriptor is deleted from the PMT, and the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good The recording information generating apparatus characterized by not converting the control information included in the broadcast signal . The recording information according to claim 1, further comprising: a recording control unit that controls recording of the stream data selected by the selecting unit and the control information converted by the converting unit as necessary. Generator. A recording information generation method for a recording information generation apparatus that generates recording information using a broadcast signal in which a layered transmission method is adopted,
An acquisition step of acquiring the broadcast signal;
A detection step of detecting information indicating a reception status of the broadcast signal acquired by the processing of the acquisition step;
A selection step of selecting the stream data to be recorded out of the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the processing of the detection step;
Based on the information indicating the reception status of the broadcast signal detected by the processing of said detecting step, see contains a conversion step of converting optionally the control information included in the broadcast signal,
In the processing of the selection step, information indicating the reception status of the broadcast signal detected by the processing of the detection step is included in the broadcast signal when it indicates that the reception status of the broadcast signal is good Among the stream data, high-level stream data is selected as the stream data to be recorded, and information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good. If it indicates that the stream data included in the broadcast signal is all selected as the stream data to be recorded,
In the process of the conversion step, when the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, the control of the broadcast signal Information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the information, and the reception status of the broadcast signal is not good. If so, the control information included in the broadcast signal is not converted . A program for causing a computer to execute processing for generating recorded information using a broadcast signal in which a hierarchical transmission method is adopted,
An acquisition step of acquiring the broadcast signal;
A detection step of detecting information indicating a reception status of the broadcast signal acquired by the processing of the acquisition step;
A selection step of selecting the stream data to be recorded out of the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the processing of the detection step;
Based on information indicating the reception status of the broadcast signal detected by the process of the detection step, causing the computer to execute a process including a conversion step of converting the control information included in the broadcast signal as necessary,
In the processing of the selection step, information indicating the reception status of the broadcast signal detected by the processing of the detection step is included in the broadcast signal when it indicates that the reception status of the broadcast signal is good Among the stream data, high-level stream data is selected as the stream data to be recorded, and information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good. If it indicates that the stream data included in the broadcast signal is all selected as the stream data to be recorded,
In the process of the conversion step, when the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, the control of the broadcast signal Information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the information, and the reception status of the broadcast signal is not good. If so, the control information included in the broadcast signal is not converted . Acquisition means for acquiring stream data and control information recorded in a predetermined recording medium;
Extraction means for extracting a predetermined PMT from the stream data and the control information acquired by the acquisition means;
Playback control means for controlling playback of the stream data based on whether or not the PMT extracted by the extraction means includes a predetermined layer transmission descriptor ,
The reproduction control unit controls reproduction of high-level stream data when the PMT does not include the hierarchical transmission descriptor, and when the PMT includes the hierarchical transmission descriptor, An information reproducing apparatus for controlling reproduction of stream data . When the stream data whose playback is controlled by the playback control unit is switched from the high-level stream data to the low-level stream data, or from the low-level stream data to the high-level stream data, The information reproducing apparatus according to claim 5 , further comprising notification processing execution means for executing processing for notifying a user that the stream data whose reproduction is controlled by the reproduction control means has been switched. An information reproducing method of an information reproducing apparatus for reproducing information,
An acquisition step of acquiring stream data and control information recorded in a predetermined recording medium;
An extraction step of extracting a predetermined PMT from the stream data and the control information acquired by the processing of the acquisition step;
The PMT extracted by the processing of the extracting step, based on whether or not includes a predetermined hierarchical transmission descriptor, look including a reproduction control step for controlling reproduction of said stream data,
In the process of the reproduction control step, when the layer transmission descriptor is not included in the PMT, the reproduction of high-layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, An information reproduction method comprising controlling reproduction of low-level stream data . A program for causing a computer to execute processing for reproducing information,
An acquisition step of acquiring stream data and control information recorded in a predetermined recording medium;
An extraction step of extracting a predetermined PMT from the stream data and the control information acquired by the processing of the acquisition step;
Causing the computer to execute a process including a reproduction control step for controlling reproduction of the stream data based on whether or not a predetermined layer transmission descriptor is included in the PMT extracted by the process of the extraction step ;
In the process of the reproduction control step, when the layer transmission descriptor is not included in the PMT, the reproduction of high-layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, A program for controlling reproduction of low-level stream data . First acquisition means for acquiring a broadcast signal in which a hierarchical transmission method is adopted;
Detection means for detecting information indicating a reception status of the broadcast signal acquired by the first acquisition means;
Selection means for selecting the stream data to be recorded among the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the detection means;
Conversion means for converting the control information included in the broadcast signal as necessary based on information indicating the reception status of the broadcast signal detected by the detection means;
Recording control means for controlling the recording of the stream data selected by the selection means and the control information converted by the conversion means as necessary;
Second acquisition means for acquiring the stream data and the control information whose recording is controlled by the recording control means;
Extraction means for extracting a predetermined PMT from the stream data and the control information acquired by the second acquisition means;
The PMT extracted by the extraction means, based on whether or not includes a predetermined hierarchical transmission descriptor, Bei example and a reproduction control means for controlling the reproduction of said stream data,
When the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is good, the selection unit includes the stream data included in the broadcast signal. The high-level stream data is selected as the recorded stream data, and the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good. The stream data included in the broadcast signal is selected as the recorded stream data,
If the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is good, the conversion means is included in the control information of the broadcast signal When predetermined information which is a hierarchical transmission descriptor is deleted from the PMT, and the information indicating the reception status of the broadcast signal detected by the detection means indicates that the reception status of the broadcast signal is not good , Without converting the control information included in the broadcast signal,
The reproduction control unit controls reproduction of high-level stream data when the PMT does not include the hierarchical transmission descriptor, and when the PMT includes the hierarchical transmission descriptor, An information recording / reproducing apparatus for controlling reproduction of stream data . In a recording / reproducing method of a recording / reproducing apparatus for recording / reproducing a broadcast signal adopting a hierarchical transmission method,
A first acquisition step of acquiring the broadcast signal;
A detection step of detecting information indicating a reception status of the broadcast signal acquired by the processing of the first acquisition step;
A selection step of selecting the stream data to be recorded out of the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the processing of the detection step;
Based on information indicating the reception status of the broadcast signal detected by the process of the detection step, a conversion step of converting control information included in the broadcast signal as necessary,
A recording control step for controlling the recording of the stream data selected by the processing of the selection step and the control information converted as necessary by the processing of the conversion step;
A second acquisition step of acquiring the stream data and the control information whose recording is controlled by the processing of the recording control step;
An extraction step of extracting a predetermined PMT from the stream data and the control information acquired by the processing of the second acquisition step;
A playback control step for controlling playback of the stream data based on whether or not a predetermined layer transmission descriptor is included in the PMT extracted by the processing of the extraction step ,
In the processing of the selection step, information indicating the reception status of the broadcast signal detected by the processing of the detection step is included in the broadcast signal when it indicates that the reception status of the broadcast signal is good Among the stream data, high-level stream data is selected as the stream data to be recorded, and the information indicating the reception status of the broadcast signal detected by the processing of the detection step is good reception status of the broadcast signal If it indicates that the stream data included in the broadcast signal is all selected as the stream data to be recorded,
In the process of the conversion step, when the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, the control of the broadcast signal Information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the information, and the reception status of the broadcast signal is not good. Indicates that the control information included in the broadcast signal is not converted,
In the process of the reproduction control step, when the layer transmission descriptor is not included in the PMT, the reproduction of high-layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, An information recording / reproducing method comprising controlling reproduction of low-level stream data . A program for causing a computer to execute processing for recording and reproducing a broadcast signal in which a hierarchical transmission method is adopted,
A first acquisition step of acquiring the broadcast signal;
A detection step of detecting information indicating a reception status of the broadcast signal acquired by the processing of the first acquisition step;
A selection step of selecting the stream data to be recorded out of the stream data included in the broadcast signal based on information indicating the reception status of the broadcast signal detected by the processing of the detection step;
Based on information indicating the reception status of the broadcast signal detected by the process of the detection step, a conversion step of converting control information included in the broadcast signal as necessary,
A recording control step for controlling the recording of the stream data selected by the processing of the selection step and the control information converted as necessary by the processing of the conversion step;
A second acquisition step of acquiring the stream data and the control information whose recording is controlled by the processing of the recording control step;
An extraction step of extracting a predetermined PMT from the stream data and the control information acquired by the processing of the second acquisition step;
Causing the computer to execute a process including a reproduction control step for controlling reproduction of the stream data based on whether or not the PMT extracted by the process of the extraction step includes a predetermined layer transmission descriptor. ,
In the processing of the selection step, information indicating the reception status of the broadcast signal detected by the processing of the detection step is included in the broadcast signal when it indicates that the reception status of the broadcast signal is good Among the stream data, high-level stream data is selected as the stream data to be recorded, and information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good. If it indicates that the stream data included in the broadcast signal is all selected as the stream data to be recorded,
In the process of the conversion step, when the information indicating the reception status of the broadcast signal detected by the processing of the detection step indicates that the reception status of the broadcast signal is good, the control of the broadcast signal Information indicating the reception status of the broadcast signal detected by the processing of the detection step is deleted from the PMT included in the information, and the reception status of the broadcast signal is not good. Indicates that the control information included in the broadcast signal is not converted,
In the process of the reproduction control step, when the layer transmission descriptor is not included in the PMT, the reproduction of high-layer stream data is controlled, and when the layer transmission descriptor is included in the PMT, A program for controlling reproduction of low-level stream data .

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