JP2010067305A - Recording apparatus and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording apparatus and a recording method which can present quality evaluation that matches viewing conditions of a viewer and a quality allowable range and complement a point where quality conditions are poor when a digital broadcasting program with poor reception quality is recorded. <P>SOLUTION: The recording apparatus 100 which receives and records a digital broadcasting program, has a program accumulating section 105 that accumulates compressed AV data of the received digital broadcasting program, an AV decoder (an audio decoder 106 and a video decoder 107) that decodes the compressed AV data and outputs AV decoding error information, and a data controlling section 104 that operates the AV decoder upon recording to acquire the AV decoding error information and generates recording quality evaluation information based on the AV decoding error information and stores the recording quality evaluation information in the program accumulating section 105 so as to be associated with the recorded program. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a recording apparatus and a recording method for recording a digital broadcast program.

  In recent years, with the spread of digital broadcasting, recording apparatuses that store broadcast programs such as next-generation DVD recorders and HDD recorders as transport streams or convert them into other digital data are becoming common. Also, in digital broadcasting, there are not a few operations in which the same program is repeatedly broadcast, and even if a viewer fails to record once, it is possible to record the same program in another time zone.

  By the way, in digital broadcasting, digital data in the transport stream may be lost due to bad weather or a transmission path failure, resulting in video block noise or abnormal audio, which may be disadvantageous to the viewer. is there. When a broadcast program is recorded using the recording apparatus as described above, the viewer does not notice any abnormality at the stage of recording, and often notices an abnormality only when the recorded program is played back and viewed. In particular, digital broadcasting has increased the need to store recorded programs as a library, and viewers are strongly demanded for recording devices capable of recording higher-quality video and audio.

  For this reason, conventionally, when receiving a digital broadcast hierarchically transmitted by a portable / mobile body such as a portable terminal or an automobile, and recording and reproducing it in a storage device, the electric field strength of the received radio wave, C / N value, BER, etc. Based on this information, the reception quality is analyzed to create a reception quality list, which is recorded on the recording medium together with the time information. When the digital broadcast is reproduced from the recording medium, the reception quality list is analyzed, and the optimum hierarchical service is selected and reproduced / displayed based on the analysis result. As a result, a method has been proposed in which a digital broadcast can be reproduced as well as when recording a digital broadcast on a portable terminal or an automobile (see, for example, Patent Document 1).

Also, in a digital broadcast receiver for mobile use, an AGC value obtained at the time of reception demodulation and a BER value for maintaining a constant reception level, a BER value serving as an index for demodulation processing, and CRC error detection of a received transstream packet The information and the decoding error information at the time of decoding the transport stream are fetched and used as reception quality judgment parameters. The reception status and reception quality are evaluated and judged from each parameter value in a comprehensive and step-by-step manner, and a warning display is displayed indicating that viewing and recording cannot be performed if the reception status / quality is low. Execute. As a result, when reception intensity sufficient for demodulation and decoding is obtained, reception quality can be accurately identified and displayed even in a reception environment in which errors frequently occur and viewing or recording becomes impossible. A method has been proposed (see, for example, Patent Document 2).
JP 2005-31550 A JP 2006-20236 A

  However, since the conventional digital broadcast receiving apparatus (recording apparatus) determines the quality and quality of the recorded program using only the information obtained in the decoding process of the received transport stream, the actual viewing of the viewer There has been a problem that it does not necessarily match the situation (for example, display device size, speaker specifications, amplifier usage status, etc.) and the viewer's acceptable quality range.

  Conventionally, there is no effective supplement means for a recorded program with poor reception quality, and there is a problem that the viewer has to watch the recorded program with poor quality as it is.

  The present invention has been made to solve the above-mentioned problems, and when a digital broadcast program with poor reception quality is recorded, the viewer is presented with a quality evaluation that matches the viewing status and quality tolerance of the viewer. An object of the present invention is to provide a recording apparatus and a recording method capable of complementing a portion having a poor quality situation.

  To achieve the above object, a recording apparatus according to claim 1 of the present invention is a recording apparatus that receives a digital broadcast program and records it as a recorded program, and stores compressed AV data of the received digital broadcast program. A program storage unit, an AV decoder that decodes compressed AV data and outputs AV decoding error information, and operates the AV decoder during recording to acquire AV decoding error information, and evaluates recording quality based on the AV decoding error information And a data control unit that stores the recording quality evaluation information in association with the recorded program in the program storage unit.

  With such a configuration, by using not only mere reception error information but also decoding error information of the AV decoder, when a digital broadcast program with poor reception quality is recorded, it matches the viewing status and quality tolerance of the viewer. A recording quality assessment can be presented to the viewer.

  According to a second aspect of the present invention, there is provided a recording apparatus according to the first aspect, wherein in the recording apparatus according to the first aspect, a character graphic that decodes compressed character graphic data of a data broadcast received together with a digital broadcast program and outputs character graphic decoding error information. A data decoder is further provided, and the data control unit operates the character / graphic decoder during recording to acquire character / graphic decoding error information, generates recording quality evaluation information based on the character / graphic decoding error information, and Recording quality evaluation information is stored in association with a recorded program.

  With such a configuration, the character / graphic decoding error information when decoding the character / graphic data received by data broadcasting is used for quality evaluation, so that a finer recording quality evaluation can be performed.

  The recording apparatus according to claim 3 of the present invention is the recording apparatus according to claim 1 or claim 2, wherein the data control unit is a part of the recorded program determined to be supplemented by the recording quality evaluation information or Complementary data that complements the whole is acquired, and a part or all of the corresponding recorded program stored in the program storage unit is replaced with the acquired complementary data.

  With this configuration, it is possible to replace part or all of a recorded program with poor recording quality with complementary data without error, so that even if there is an error during recording, the viewer can record a program with good quality without error. Can be played and watched.

  According to a fourth aspect of the present invention, there is provided a recording apparatus according to the third aspect, wherein the data control unit receives the rebroadcast program and acquires complementary data.

  With such a configuration, the viewer can replace a part or all of the recorded program with a rebroadcast program without error, so that the recorded program can be reproduced and viewed with good quality.

  According to claim 5 of the present invention, in the recording apparatus according to claim 3, the data control unit acquires complementary data from the program distribution server.

  With such a configuration, the viewer can replace a part or all of the recorded program with the same program distributed from the program distribution server, so that a high-quality recorded program can be reproduced and viewed.

  According to a sixth aspect of the present invention, there is provided a recording apparatus according to the third aspect, wherein the data control unit acquires complementary data from the storage medium.

  With such a configuration, the viewer can replace a part or all of the recorded program with the same program acquired from the storage medium, so that a high-quality recorded program can be reproduced and viewed.

  According to a seventh aspect of the present invention, there is provided a recording method for receiving a digital broadcast program and recording it as a recorded program in a program storage unit of a recording apparatus, wherein an AV decoder is operated during recording to record the AV of the digital broadcast program. An AV decoding step for decoding the compressed data, an AV decoding error information acquisition step for acquiring AV decoding error information from the AV decoder, and a recording quality information generation step for generating recording quality evaluation information based on the acquired AV decoding error information; And a storage step for storing the recording quality evaluation information in association with the recorded program in the program storage unit.

  When a digital broadcast program with poor reception quality is recorded, a recording device and recording that presents the viewer with a quality evaluation that matches the viewing status and quality tolerance range of the viewer, and that can complement the poor quality status. A method can be provided.

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

(Embodiment 1)
FIG. 1 is a block diagram of a recording apparatus 100 according to the present embodiment, and FIG. 2 is a diagram showing a data structure of a transport stream (hereinafter referred to as “TS stream”) 120 in MPEG2 (Moving Picture Experts Group). The configuration of the recording apparatus 100 and the function of each unit will be described with reference to FIGS. 1 and 2. The recording apparatus 100 includes an antenna 115, a tuner 116, a front end 101, a transport decoder 102, a storage unit 103, a data control unit 104, a large capacity storage unit 105, an audio decoder 106, a video decoder 107, a graphics creation unit 108, a video. A synthesis unit 109, an audio output unit 110, and a video output unit 111 are provided.

  Here, as shown in FIG. 2, the TS stream 120 is composed of 188-byte TS packets 121, and each TS packet 121 is composed of a TS header 122 and a payload 123. The payload 123 includes compressed video data and compressed audio data that have been compressed and encoded by the MPEG2 system. The TS header 122 includes information for extracting compressed video data and compressed audio data from the TS packet 121. In the following description, compressed video data and compressed audio data compressed and encoded by the MPEG2 method may be collectively referred to as compressed AV data or MPEG2 data.

  In FIG. 1, an antenna 115 receives a digital broadcast wave. The tuner 116 selects a desired channel and converts an RF (Radio Frequency) signal into an IF (Intermediate Frequency) signal for internal processing.

  The front end 101 receives an IF signal from the tuner 116, demodulates the signal modulated on the broadcast side, extracts a TS stream, and outputs the TS stream to a transport decoder (hereinafter referred to as “TS decoder”) 102. The front end 101 can monitor reception quality from information such as received radio wave intensity (antenna level) and BER (Bit Error Rate) detected by an error correction code.

  The TS decoder 102 receives a TS stream of a program received by the front end 101 when receiving a broadcast program, and separates TS packets from the TS stream. Then, the compressed audio data and the compressed video data are extracted from the payload of the TS packet and output to the audio decoder 106 and the video decoder 107, respectively. The TS decoder 102 is connected to the large-capacity storage unit 105 via the data control unit 104, and when the viewer selects recording, the TS stream received from the front end 101 is stored in the large-capacity storage unit 105 as it is. To do. Further, the TS header includes an error flag (1 bit) detected by the front end 101, and the TS decoder 102 can check whether there is an error in the TS packet by checking the error flag. Hereinafter, an error that can be checked with this error flag is referred to as a TD error.

  The audio decoder 106 returns the compressed audio data received from the TS decoder 102 to the original audio data while receiving the broadcast program or reproducing the recorded program from the large-capacity storage unit 105, and outputs it to the audio output unit 110. To do.

  The video decoder 107 restores the compressed video data received from the TS decoder 102 while receiving the broadcast program or playing the recorded program from the large-capacity storage unit 105 to the original video data, and outputs it to the video composition unit 109. To do. In the following description, when it is not necessary to distinguish between audio data and video data, these data may be collectively referred to as AV data. Similarly, when there is no need to distinguish between the audio decoder 106 and the video decoder 107, these decoders may be collectively referred to as an AV decoder.

  Also, in the recording apparatus 100 of the present embodiment, the AV decoder is operating even during recording of a broadcast program, and AV decoding errors (to be described later) can be collected sequentially from the AV decoder. By comparing the AV decoding error collected during recording with a predetermined threshold, the quality of the recorded program can be presented to the viewer before playback and viewing.

  The data control unit 104 receives the TS stream from the TS decoder 102, executes data processing for recording and saving, and records and saves the TS stream in the mass storage unit 105. At the time of reproduction, the TS stream reproduced from the large-capacity storage unit 105 is received, and this TS stream is output to the TS decoder 102. Also, as described later, various error information is acquired to determine the recording quality, and control processing such as warning to the viewer and error part complementation is performed.

  The large-capacity storage unit 105 is a program storage unit composed of a next-generation DVD, HDD, or the like, and stores and saves the received digital broadcast program as a TS stream.

  The storage unit 103 is a memory with a relatively small capacity such as a flash memory, and temporarily stores error information (error information will be described in detail later) related to the TS stream of the program recorded in the large capacity storage unit 105. It is something to keep. As will be described later, when the TS stream is reproduced from the large-capacity storage unit 105, necessary processing is executed using this error information.

  The graphics creation unit 108 creates an image to be displayed on an OSD (On Screen Display) superimposed on the video data.

  The video composition unit 109 synthesizes the image created by the graphics creation unit 108 with the video data decoded by the video decoder 107.

  The audio output unit 110 converts digital audio data into an analog audio signal and outputs it from a speaker (not shown).

  The video output unit 111 outputs digital video data to a display device such as a plasma display or a liquid crystal display.

  Each component described above is realized by hardware and software, and is controlled by a device driver (device control software).

  Next, AV decoding errors that can be detected by the audio decoder 106 and the video decoder 107 will be described in detail. Here, an AV decoding error that can be detected by the video decoder 107 will be described as an example.

  The payload 123 shown in FIG. 2 is composed of MPEG2 data, and the MPEG2 data includes various types of information regarding the video and audio of the received program as header information.

  FIG. 3 is a diagram showing the structure of MPEG2 data. As shown in FIG. 3, the MPEG2 data has a hierarchical structure, and includes a sequence layer 130, a GOP (Group Of Pictures) layer 131, a picture layer 132, a slice layer 133, a macroblock (MB) layer 134, and a block layer 135. It is composed of layers. A header indicating the characteristics of the data is added to the head of each hierarchical data. Each header is called a sequence header, a GOP header, a picture header, a slice header, a macroblock header, and a block header.

  The sequence layer 130 is MPEG2 data corresponding to one video, and the sequence header includes a vertical size (vertical size) and a horizontal size (horizontal size), an aspect ratio, an image display cycle, a bit rate, and interlace scanning. Information relating mainly to the video format such as whether it is progressive scanning or the like is described.

  The GOP layer 131 is composed of three types of pictures (video frames) such as an I picture, a B picture, and a P picture, and information such as a time code indicating the time from the beginning of the sequence is described in the GOP header.

  The picture layer 132 is composed of a plurality of slices. The picture header includes a display order of each picture, a picture type indicating a distinction between an I picture, a B picture, and a P picture, information on motion vectors, and quantization. Matrix coefficient information, encoding information (whether zigzag scan or alternate scan is used) and the like are described.

  The slice layer 133 is composed of a plurality of macro blocks, and slice position designation information is described in the slice header.

  The macroblock layer 134 includes a plurality of blocks, and information such as a frame / field prediction type and whether DCT (discrete cosine) is a frame type or a field type is described in the macroblock header.

  The block layer 135 is composed of DCT encoded data, and various parameter information related to DCT conversion is described in the block header.

  If an error occurs in these header information, the video quality is greatly affected. For example, if an error occurs in a specific macroblock of MPEG2 data, only the video portion corresponding to the macroblock needs to be deteriorated. However, if an error occurs in the header information, the entire video frame or GOP sequence is generated. May be affected throughout. These header information can be directly acquired from the video decoder 107. By looking at this header information, various video and audio-specific error information other than the TD error that can be acquired by the TS decoder 102 can be collected. .

  When data in the TS stream 120 is lost or rewritten with other data due to some failure during the transmission of the TS stream 120, the video decoder 107 acquires the following abnormal value. At that time, the video decoder 107 performs decoding processing that seems to be normal as much as possible, but for information that cannot be determined, recovery is performed by processing such as discarding frame data, replacing data, and correcting depending on the type of information. There is a correlation between the recovery process at this time and the appearance of the video, and by obtaining the number of such errors per unit time or the like, the poor appearance can be quantitatively estimated.

  Hereinafter, examples of abnormal values acquired from the video decoder 107 are shown.

(1) Image size When the value of Vertical Size or Horizontal Size included in the sequence header is invalid, for example, it becomes an abnormal value exceeding the maximum value or 0 or the like.

(2) Image type An undefined value occurs in Picture Concatenating Type that defines any one of the three image types I, P, and B included in the picture header.

(3) Definition of interlaced scanning and progressive scanning The progressive sequence included in the sequence header and the progressive frame included in the GOP layer header do not match. For example, one is defined as I and the other is defined as P.

(4) Coefficient of quantization matrix The quantization matrix coefficient of the picture header is less than the specified value.

(5) Time information The relationship between the time information of the PCR and the time information of the PTS is not within the specified range, resulting in a significant mismatch. For example, the PCR value or the PTS value is an illegal value.

  Next, the relationship between the reception level by the antenna 115 of the recording apparatus 100 and the reception error will be described with reference to FIG. FIG. 4 is a diagram showing the correlation between the reception level by the antenna 115 and the number of AV decoding errors and the number of TD decoding errors.

  In FIG. 4, the horizontal axis represents the elapsed time, and the vertical axis represents the antenna level and the number of received data errors. In the drawing, a one-dot chain line 150 indicates an antenna level, a solid line 151 indicates an AV decoding error number, and a dotted line 152 indicates a TD decoding error number. The antenna level area 140 is an area where there is no noise and the TV screen can be viewed, the antenna level area 141 is an area where noise is generated on the TV screen, and the antenna level area 142 is too noisy and the TV screen is black. The areas where there is no out and no sound are shown.

  Here, the antenna level is the level of the electric field intensity received by the antenna, the AV decoding error is a decoding error occurring in the audio decoder 106 and the video decoder 107 in FIG. 1, and the TD decoding error is the TS decoder. 102 is an error that occurs. As shown in FIG. 4, when the antenna level 150 is in the antenna level region 140, neither an AV decoding error nor a TD decoding error occurs. However, when the antenna level 150 is lowered to the antenna level region 141, an AV decoding error occurs. When the level 150 further decreases and reaches the antenna level region 142, a TD decoding error occurs.

  Next, the recording operation of the recording apparatus 100 according to the present embodiment will be described with reference to FIG. Here, an example will be described in which a recording reservation is made in advance in the recording apparatus 100, recording starts automatically at the recording start time according to the recording reservation, and recording ends automatically when the recording end time comes. FIG. 5 is a flowchart showing the procedure of the recording operation of the recording apparatus 100 according to the present embodiment.

  When the recording apparatus 100 starts recording (step S101), the recording apparatus 100 waits for a predetermined time (step S102). Next, the data control unit 104 acquires the antenna level and C / N value held by the device driver of the tuner 116 (step S103), and the number of errors (TD decoding error) held by the device driver of the TS decoder 102. Number) (step S104), the number of audio decoding errors held by the device driver of the audio decoder 106 (step S105), and the number of video decoding errors held by the device driver of the video decoder 107 (step S105). After obtaining a series of error information (S105), the process proceeds to step S107.

  Next, in step S107, the data control unit 104 checks whether or not the antenna level value is larger than a predetermined threshold value. If the antenna level value is larger than the predetermined threshold value (“Yes”), the process proceeds to step S109, and if the antenna level value is smaller than the predetermined threshold value (“No”), the antenna level value falls below the predetermined threshold value. The time information and the antenna level value at that time are stored in the recording error table which is the recording quality evaluation information of the storage unit 103 (step S108), and the process proceeds to step S109.

  In step S109, the data control unit 104 reads the number of errors acquired from each device driver in steps S104 to S106 from the storage unit 103, checks whether there are various errors, and if there are no errors (“Yes”). The process proceeds to step S111 as it is. If an error exists (“No”), the time information and the number of various errors when various errors occur are stored in the recording error table of the storage unit 103 (step S110), and the process proceeds to step S111.

  In step S111, it is confirmed whether or not the recording end time has been reached. If the recording end time has not been reached (“Yes”), the process returns to step S102 and this step is repeated. On the other hand, when the recording end time has been reached (“No”), the recording error table is read from the storage unit 103 and stored in the large capacity storage unit 105 in association with the recorded AV data (step S112). The process ends (step S113).

  As described above, in the recording apparatus 100 according to the present embodiment, the antenna level value and various types of error information are stored in the large-capacity storage unit 105 as the recording error table associated with the recorded AV data. If error information is read from the recording error table, the error status during recording can be easily confirmed. Accordingly, a warning can be issued to the viewer in advance, or a warning can be displayed on the video being played to notify the viewer. Further, since the error information includes AV decode error information, it is possible to accurately reflect not only the number of errors but also the recording quality actually felt by the viewer.

(Embodiment 2)
FIG. 6 is a block configuration diagram of the recording apparatus 200 in the present embodiment. FIG. 6 differs from FIG. 1 of the first embodiment in that a character / graphic decoder 112 is added between the TS decoder 102 and the video composition unit 109. The other components are the same as those in FIG. In the first embodiment, the recording quality is evaluated using an AV decoder error. However, the recording apparatus 200 according to the present embodiment uses a decoding error of character / graphic data during data broadcasting in addition to the AV decoding error. It is.

  In FIG. 6, a character graphic decoder 112 is a decoder for decoding compressed character graphic data included in data broadcasting. Character graphic data during data broadcasting is transmitted in a compression format of JPEG (Joint Photographic Experts Group) or PNG (Portable Network Graphics) method while video data is compressed by MPEG2. The compressed character graphic data separated by the TS decoder 102 is decoded by the character graphic decoder 112 and output to the video composition unit 109. The video synthesis unit 109 synthesizes the video data decoded by the video decoder 107, the graphics data created by the graphics creation unit 108, and the character / graphic data decoded by the character / graphic decoder 112 as a video signal. To 111.

  Next, the recording operation of the recording apparatus 200 according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing the procedure of the recording operation of the recording apparatus 200 of the present embodiment. FIG. 7 differs from FIG. 5 of the first embodiment in that step S120 is added between steps S106 and S107. Since the other processing steps in FIG. 7 are the same as those in FIG.

  In FIG. 7, after the recording apparatus 200 starts recording in step S <b> 101, the process proceeds to step S <b> 120 after the processing of steps S <b> 102 to S <b> 106, and the data control unit 104 stores the number of errors held by the device driver of the character / graphic decoder 112. To get. Subsequently, the recording is finished through the processing steps from Step S107 to Step S112.

  As described above, in recording apparatus 200 in the present embodiment, in addition to the error information from AV decoder in the first embodiment, error information at the time of decoding character / graphic data included in the data broadcast is used. This makes it possible to evaluate the recording quality in more detail.

(Embodiment 3)
Next, Embodiment 3 will be described. This embodiment is different from the first embodiment or the second embodiment in that the viewer setting information is stored in the large-capacity storage unit 105 in FIG. 1 or FIG. Since the rest of the configuration is not changed, description of the configuration block is omitted. In the first and second embodiments, the recording quality is evaluated using the decoding error information of the audio decoder 106, the video decoder 107, and the character / graphic decoder 112.

  In this embodiment, a viewer sets a quality allowable range in advance, and an error information table is created by associating the recording error information including the error contents and the cause thereof with the recording time in accordance with the allowable range. In this error information table, information for replacing recorded AV data is also described. Then, this table is displayed together with program information.

  FIG. 8 is a diagram showing an example of the recording quality confirmation screen 301 in the present embodiment. In FIG. 8, a recording quality confirmation screen 301 is composed of broadcast program information 302 including a program name, a broadcast channel, a broadcast date, and a broadcast time, a reproduced image 303 of a recorded program, and an error information table 304. As the contents of the broadcast program information 302, service information (SI information) sent together with the broadcast program is stored in the storage unit 103, and the information is used. The error information table 304 includes a reproduction status display field 305, an error occurrence time field 306, recording error information 307, and an AV data replacement candidate field 308.

  The reproduction status display field 305 indicates the location (time) that is currently being reproduced. The error occurrence time column 306 indicates the start time and end time of the location where the error has occurred.

  The recording error information 307 indicates the error content and the cause of the error prediction. As the error contents, a state in which block noise occurs on the playback screen (corresponding to the antenna level area 141 in FIG. 4) and a state in which blackout or sound interruption occurs (corresponding to the antenna level area 142 in FIG. 4) are displayed. As the cause of the error, bad weather or the like is displayed.

  In the AV data replacement candidate column 308, candidates for replacing the AV data at the place where the error has occurred are displayed. Examples of candidates include a rebroadcast program, a net distribution program, and a next-generation DVD or HDD storage medium. The AV data replacement candidate will be described in detail later in Embodiment 4.

  The viewer can grasp the detailed error information for each recorded program by checking the error information table 304. Therefore, it is possible to accurately determine whether or not it is necessary to replace an error image that is difficult to determine only by the number of errors by checking the reproduced image 303 at the error location with the viewer's own eyes.

  As described above, in the present embodiment, the viewer can easily check the error status of the recorded program, and can accurately determine whether or not replacement is necessary.

(Embodiment 4)
Next, a fourth embodiment will be described. In the first to third embodiments, the quality status of the received broadcast program is checked, and if the recording quality is poor, the viewer is warned. In the present embodiment, when there is a program with poor reception quality, the time information of the poor quality part (error part) of the program is stored, and the AV data of the corresponding rebroadcast program, the program via the network The error part is complemented with AV data acquired from a distribution server or AV data stored in a storage medium such as a next-generation DVD or HDD provided in a recording apparatus.

  Hereinafter, three examples of the present embodiment will be described.

  First, the first embodiment will be described with reference to FIG. The first embodiment is an example in which the error part is complemented with AV data of a rerelease program. FIG. 9 is a flowchart showing the procedure of the complementing process of the first embodiment.

  In FIG. 9, when the complementing operation is started (step S201), the data control unit 104 acquires program information of a program having recording error information that is already stored from the table (step S202). Next, the program information scheduled to be broadcast is acquired from each currently available broadcast (terrestrial digital, BS, CS, CATV, etc.) (step S203). This information is once stored in the storage unit 103. Next, this information is read and it is confirmed whether or not the same program as the program to be complemented exists (step S204). If there is no program ("No"), the process ends as it is (step S208).

  On the other hand, if there is a program identical to the program to be complemented (“Yes”), the process proceeds to step S205, and whether or not to delete the recorded program currently stored in the large-capacity storage unit 105 and newly record it. To decide. If it is determined to delete in step S205 (“Yes”), the recorded program is deleted (step S206). On the other hand, if it is determined in step S205 that the current recorded program is not to be erased ("No"), the process directly proceeds to step S207. In step S207, a recording reservation for a rebroadcast program is set, and then the process ends (step S208).

  Next, a second embodiment will be described with reference to FIG. In the second embodiment, the error part is complemented with AV data received via the network. FIG. 10 is a flowchart showing the procedure of the complementing process of the second embodiment.

  In FIG. 10, when the complementing operation is started (step S301), program information and storage format information of a program having recording error information that is already stored is acquired from the table (step S302). The storage format is an encoding method such as Codec. Next, program information and storage format information are acquired from a pre-registered program distribution server group (step S303). It is assumed that the recording apparatus is connected to a network in advance and has an environment for communicating with a program distribution server that distributes a program broadcast in the past. The recording apparatus downloads an electronic program guide to be distributed from the program distribution server in advance and stores it in the storage unit 103. Next, in step S304, it is determined whether or not the same program as the program to be complemented exists. If the same program does not exist ("No"), the process ends as it is (step S310).

  On the other hand, if the same program is present in step S304 (“Yes”), the process proceeds to step S305 to determine whether or not to replace some data corresponding to the error part. When all the replacements are made in step S305 (“No”), the process proceeds to step S309. When partial replacement is performed in step S305 (“Yes”), it is determined whether the coding method information such as Codec matches (step S306). If there is a code that matches the encoding method (“Yes”), only the data in the portion with an error is downloaded and replaced (step S307), and the process ends.

  On the other hand, if there is no matching encoding method in step S306 ("No"), since partial replacement is not possible, it is determined whether to replace all (step S308). When replacing all ("Yes"), the stored program is deleted, downloaded from the program distribution server (step S309), and the process ends.

  Next, a third embodiment will be described with reference to FIG. In the third embodiment, the error part is complemented from the same program recorded on the next-generation DVD or HDD. FIG. 11 is a flowchart showing the procedure of the complementing process of the third embodiment.

  In FIG. 11, when the complementing operation is started (step S401), program information and storage format information of a program having recording error information already stored is acquired from the table (step S402). Next, program information and storage format information are acquired from the mounted HDD or the inserted BD (Blu-ray Disc) (step S403). Next, it is determined in step S404 whether or not the same program as the program to be complemented exists, and if the same program does not exist ("No"), the process ends as it is (step S411).

  On the other hand, if the same program exists in step S404 ("Yes"), the process proceeds to step S405, and it is determined whether the encoding method information such as Codec matches. If there is a matching encoding method (“Yes”), it is determined whether there is no error information at the copy source at the time when there is error information at the top of the list in the error information table 304 (step S406). If there is no error information at the copy source in step S406 (“Yes”), one piece of data is replaced (step S407), and then the top of the error information table 304 is deleted in step S409. If there is error information at the copy source in step S406 ("No"), the data for one case is not replaced (step S408).

  Thereafter, in step S410, it is determined whether error information still exists on the list of the error information table 304. If error information still exists (“Yes”), the process returns to step S406 and the process is repeated. If there is no error information on the list (“No”), the process ends.

  As described above, according to the present embodiment, when there is a portion where the recording quality is extremely bad, the program information is searched for whether the same program as the recorded program is scheduled to be broadcast and recorded automatically. Also equipped. Also, if the location where data loss has occurred can be identified based on the error information, the relevant part of the same program is recorded again and only the missing part data is replaced, or only that part is re-acquired from the program distribution server. Thus, a means for complementing the recorded program is provided.

  Thus, according to the present invention, it is possible to give peace of mind to the viewer who has recorded the program by presenting that the recording has been performed with high quality. Even if the recording quality is poor, the information can be presented immediately without the viewer watching and the viewer can be alerted. At the same time, it is possible to supplement the AV data of the program whose recording quality is poor with the AV data separately acquired.

  The present invention can be widely used for all recording apparatuses that receive digital broadcasts and record compression-encoded programs.

Block diagram of a recording apparatus in Embodiment 1 of the present invention The figure which shows the data structure of TS stream in MPEG2 Diagram showing the structure of MPEG2 data The figure which shows the correlation of the reception level by an antenna, the number of AV decoding errors, and the number of TD decoding errors The flowchart which shows the procedure of the video recording operation | movement of the video recording apparatus in Embodiment 1 of this invention. The block block diagram of the video recording apparatus in Embodiment 2 of this invention The flowchart which shows the procedure of the video recording operation | movement of the video recording apparatus in Embodiment 2 of this invention. The figure which shows an example of the recording quality confirmation screen in Embodiment 3 of this invention. The flowchart which shows the procedure of the complementation process of the 1st Example in Embodiment 4 of this invention. The flowchart which shows the procedure of the complementation process of 2nd Example in Embodiment 4 of this invention. The flowchart which shows the procedure of the complementation process of the 3rd Example in Embodiment 4 of this invention.

Explanation of symbols

100, 200 Recording device 101 Front end 102 Transport decoder (TS decoder)
103 Storage Unit 104 Data Control Unit 105 Large Capacity Storage Unit (Program Storage Unit)
106 Audio decoder (AV decoder)
107 Video decoder (AV decoder)
108 graphics creation unit 109 video synthesis unit 110 audio output unit 111 video output unit 112 character graphic decoder 115 antenna 116 tuner 120 transport stream (TS stream)
121 TS packet 122 TS header 123 Payload 130 Sequence layer 131 GOP layer 132 Picture layer 133 Slice layer 134 Macroblock layer 135 Block layer 301 Recording quality confirmation screen 302 Broadcast program information 303 Playback image 304 Error information table 305 Playback status display field 306 Error Occurrence time column 307 Recording error information 308 AV data replacement candidate column

Claims (7)

A recording device that receives a digital broadcast program and records it as a recorded program,
A program storage unit for storing compressed AV data of the received digital broadcast program;
An AV decoder for decoding the compressed AV data and outputting AV decoding error information;
The AV decoder is operated during recording to acquire the AV decoding error information,
Generating recording quality evaluation information based on the AV decoding error information;
A data control unit for storing the recording quality evaluation information in association with the recorded program in the program storage unit;
A recording apparatus comprising: A character graphic data decoder that decodes compressed character graphic data of a data broadcast received together with a digital broadcast program and outputs character graphic decoding error information is further provided.
The data control unit operates the character graphic decoder during recording to acquire the character graphic decoding error information, generates recording quality evaluation information based on the character graphic decoding error information,
The recording apparatus according to claim 1, wherein the recording quality evaluation information is stored in the program storage unit in association with the recorded program. The data control unit obtains supplement data for complementing a part or all of a recorded program determined to be supplemented by the recording quality evaluation information;
The recording apparatus according to claim 1, wherein a part or all of the corresponding recorded program stored in the program storage unit is replaced with the acquired complementary data. The recording apparatus according to claim 3, wherein the data control unit receives a rebroadcast program and acquires the complementary data. The recording apparatus according to claim 3, wherein the data control unit acquires the complementary data from a program distribution server. The recording apparatus according to claim 3, wherein the data control unit acquires the complementary data from a storage medium. A recording method for receiving a digital broadcast program and recording it as a recorded program in a program storage unit of a recording device,
An AV decoding step of operating an AV decoder during recording to decode AV compressed data of the digital broadcast program;
AV decoding error information acquisition step for acquiring AV decoding error information from the AV decoder;
A recording quality information generating step for generating recording quality evaluation information based on the acquired AV decoding error information;
A storage step of storing the recording quality evaluation information in association with the recorded program in the program storage unit;
A recording method characterized by comprising:

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