JP2004088321A - Digital broadcast reception storage reproducing apparatus and mobile receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast reception storage reproducing apparatus provided with a data storage means for efficiently utilizing an HDD. <P>SOLUTION: The digital broadcast reception storage reproducing apparatus 1 includes: a storage means 14 for storing, reproducing input data and outputting reproduced data; a storage means controller 13 for controlling data input to/ data output from the means 14; a decoding means 15 for decoding the output data from the means 14 to output video and audio; a compression encoding means 17 for applying compression encoding to an output from the means 15 and outputting the result to the controller 13; and a control means 12 for controlling the means 14, the controller 13, and the means 15 and 17. The controller 13 and the means 15 perform compression processing in a time base direction so that the speed of the video and audio obtained by the data reproduction from the means 14 and the decode processing by the means 15 is faster than the substantial reproduction speed of the substantial video and audio, and the means 17 applies compression encoding to the video and audio subjected to the compression processing in the time base direction and stores the result to the means 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital broadcast receiving / storage / playback apparatus, and more particularly to a storage / playback data processing method for storing and playing back program data received by digital broadcasting in a storage unit.
[0002]
[Prior art]
2. Description of the Related Art In recent years, digital broadcasting has rapidly spread, and BS digital broadcasting services using broadcasting satellites have been provided following CS digital broadcasting using communication satellites. In the future, digital broadcasting services using terrestrial broadcasting are also planned, and it is becoming possible to view a wide variety of contents through digital broadcasting. In digital broadcasting, program data is compressed and digitized, so that programs can be stored in a hard disk device (hereinafter abbreviated as HDD), which is a digital data storage medium conventionally used in PCs (Personal Computers). It has become. Furthermore, due to the rapid development of compression coding technology, it is possible to view contents composed of video and audio with a small device that can be carried around, and to obtain and view contents through communication using a network due to the development of the Internet. It is possible to do.
[0003]
Since the above-mentioned HDD is not easy to replace the storage medium due to its price and structure compared with a conventional video recorder such as a video tape recorder or the like, storage and management are performed efficiently for effective use. This is very important. A conventional recording apparatus using an HDD for storing and managing program data includes, for example, data already stored when new content is stored, as disclosed in JP-A-2001-169235. There is a way to secure free space by discarding
[0004]
FIG. 12 shows a configuration example of the above conventional example, and the operation will be described. In FIG. 12, the content storage / reproduction means includes a reception means 901 such as a tuner for receiving the content, a storage management means 902 for managing the storage of the content, a storage means 903 for storing the content, and a presentation means for displaying the content. 904, content value evaluation means 907 for calculating the evaluation value of the content, destruction candidate selection means 906 for updating the destruction candidate list of the content based on the evaluation value of the content, necessary for storing this content when new content is received. The content discarding unit 905 deletes the minimum necessary content obtained from the list in order to secure the storage capacity of the storage unit.
[0005]
In the configuration of FIG. 12, the evaluation value of the content stored in the storage unit 903 is calculated by the content value evaluation unit 907, and a list describing at least the evaluation value and the data size of the content is created by the discard candidate selection unit 906. The list is updated by re-evaluating the evaluation value asynchronously with the reception of the content, and when new content is received, the minimum required value obtained from the list is used to secure the storage capacity necessary for storing this content. The content is deleted from the storage unit 903 by the content discarding unit 905. Therefore, when the free space of the storage unit 903 becomes necessary, the content can be discarded based on the list, and the required capacity can be secured in a short time.
[0006]
Further, as shown in Japanese Patent Application Laid-Open No. H11-346166, in order to view a program stored in a small portable device, a transfer priority is set for each program component constituting one program data, and the transfer priority is set. There is a method of distributing the program components in the time axis direction in the order of the transfer priorities and transferring them to the portable device.
[0007]
[Problems to be solved by the invention]
In the storage means management method described in Japanese Patent Application Laid-Open No. 2001-169235, a case where a large number of relatively small contents in data broadcasting are received and stored is described. However, when recording and managing large-volume video-based television programs such as dramas, sports programs, and documentary programs, the capacity of each content is large, so the free space of the storage means is smaller than the capacity of the program to be recorded. Even if it is slightly insufficient, there is still a shortage of capacity, so there is a problem that it is not possible to secure the capacity for recording new content unless the stored content is erased more than necessary. The point was not mentioned.
[0008]
Further, in the conventional example of Japanese Patent Application Laid-Open No. 11-346166, in which a program stored in a main unit is viewed on a small portable device, it is necessary to transfer program data to be viewed from the main unit to the portable device in advance. Was.
[0009]
In view of the above problems, the present invention efficiently stores target program data in storage means built in a digital broadcast receiving, storing, and reproducing apparatus, and efficiently transfers data to a portable device or the like connected via a network. It is an object of the present invention to provide an easy-to-use digital broadcast reception / storage / playback apparatus 1 that allows a program stored in the broadcast reception / storage / playback apparatus 1 to be viewed on a small portable device.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a storage means for storing and reproducing input data in a digital broadcast receiving, storing and reproducing apparatus and outputting reproduced data, and a storage means controller for controlling data input / output to and from the storage means. Decoding means for decoding output data of the storage means and outputting video and audio; compression coding means for compressing and encoding the output of the decoding means and outputting the result to the storage means controller; Means for controlling the means controller, the decoding means, and the compression / encoding means, wherein the storage means controller and the decoding means obtain data by reproducing data from the storage means and decoding by the decoding means. The compression processing in the time axis direction is performed so that the video and audio to be reproduced are faster than the original reproduction speed of the video and audio, Condensation encoding means and to accumulate in the storage means compresses and encodes the video and audio reproduction at a faster rate than the original compressed in the time axis direction.
[0011]
Further, in the digital broadcast receiving / accumulating / reproducing apparatus of the present invention, since the data once accumulated in the accumulating means is read and compression-encoded, flexible processing can be performed without depending on the transmission rate of the received data. I did it. As a result, the data can be stored by efficiently using the storage means, so that it is possible to provide an easy-to-use digital broadcast receiving / storage / playback apparatus.
[0012]
In the digital broadcast receiving, storing and reproducing apparatus of the present invention, copyright protection can be effectively performed by encrypting program data to be stored. Furthermore, after the program data is compressed in the time axis direction and a signal reproduced at a reproduction speed higher than the original speed is compression-encoded and stored, the data temporarily stored in the storage means is deleted. Therefore, the limited capacity of the storage means can be used effectively.
[0013]
Further, the digital broadcast receiving / accumulating / reproducing apparatus of the present invention is provided with means for reducing noise generated when an audio signal is reproduced at a speed higher than the original speed, so that the reproduced sound can be prevented from deteriorating.
[0014]
Further, in the digital broadcast receiving / accumulating / reproducing apparatus of the present invention, the accumulating means for accumulating / reproducing input data and outputting reproduced data, a accumulating means controller for controlling data input / output to / from the accumulating means, Decoding means for decoding output data to output video and audio; compression-encoding means for compressing and encoding the output of the decoding means and outputting to the storage means controller; and transmitting data reproduced from the storage means to a communication line Control means for controlling the network control means, the storage means, the storage means controller, the decoding means, the compression encoding means, and the network control means. Means for reproducing the data from the storage means and the video and audio obtained by the decoding processing of the decoding means; Compression processing in the time axis direction so as to be faster than the original playback speed of audio and audio, and the compression encoding means compresses the video and audio that have been compressed in the time axis direction and played back at a higher speed than originally intended. The program data is encoded and stored in the storage means, and the stored program data can be used via a network to improve the usability.
[0015]
Further, in the digital broadcast receiving / storage / playback apparatus of the present invention, the copyright of the program data can be effectively protected by encrypting the stored program data and transmitting the encrypted program data to the network. Further, in the digital broadcast receiving / storage / playback apparatus of the present invention, the portable receiver for transferring the encrypted data via the network is a specific authenticated device, thereby effectively preventing the unauthorized use of the program data. To protect the copyright.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a digital broadcast receiving, storing and reproducing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a digital broadcast receiving, storing and reproducing apparatus according to the present invention.
[0017]
A digital broadcast receiving, storing and reproducing apparatus 1 according to the present invention includes an input terminal T11 for packetized and multiplexed stream data, a demultiplexer 11 for separating a specified packet from the input stream data, and an entire digital broadcast receiving, storing and reproducing apparatus 1. A control means 12 for controlling, a storage means controller 13 for controlling data input / output of a storage means described later, a storage means 14, a decoder 15 for decoding coded video / audio, enlargement / reduction of a decoded video signal, etc. Graphic processing means 16 for performing processing or superimposing OSD (On Screen Display) on the video signal, output terminal T12 for the video signal subjected to the graphic processing, output terminal T13 for the decoded audio signal, and compression encoding the video signal and the audio signal. Encoder 17 to be converted to a remote control (not shown) Configured with a command input terminal T14 for inputting a command to the digital broadcast receiving storage and reproduction apparatus 1 or the like. In the digital broadcast receiving, storing and reproducing apparatus 1 according to the present invention, the demultiplexer 11, the control means 12, the storage means controller 13, the decoder 15, the graphic processing means 16 and the encoder 17 perform data and control commands via a control bus (not shown). Is to exchange.
[0018]
In FIG. 1, data input from a stream data input terminal T11 is input to a demultiplexer 11. The input data described in the present embodiment is obtained by multiplexing, in packet units, video data, audio data, data of data broadcast, and various data used for operation control of a receiver, etc., obtained by receiving a digital broadcast. It was done.
[0019]
FIG. 2 shows an example of the input data. In FIG. 2, a transport stream (hereinafter abbreviated as TS) 11 in ISO / IEC13818-1 (commonly referred to as the MPEG2 system standard) is a PAT (Program Association Table), a PMT (Program Map Table), which is data used for channel selection and the like. , NIT (Network Information Table), and packets of video 1, audio 1, video 2, audio 2, etc., which constitute the received television program.
[0020]
FIG. 3 shows a program selection procedure, and the operation of program selection will be described. When the user selects a program using a remote controller or the like in the first step (S1), a corresponding command is input to the control means 12 from the command input terminal T14. In the next step (S2), the control means 12 controls the demultiplexer 11 to separate the information of the PAT and to transfer the information to the control means 12. The PAT stores PMT identification information (Packet ID = PID) included in the input stream. The control unit 12 recognizes the PID of the PMT by analyzing the PAT (S3), and controls the demultiplexer 11 to separate the PMT packet in the next step (S4) and transfer the packet to the control unit 12.
[0021]
The PMT is a packet that stores the PID of a packet in which video and audio of a program are stored, and a different PID is assigned to each program. Therefore, in step S2, the channel selecting means 13 separates and transfers the PMT corresponding to the program selected by the user to the demultiplexer 11, and analyzes this (step S3). In the next step (S4), the control means 12 controls the demultiplexer 11 to separate the video and audio packets of the program selected by the user according to the information obtained by analyzing the PMT.
[0022]
Here, when viewing the separated program as it is, video and audio data of the separated information are input to the decoder 15. The decoder 15 decodes the input coded video data and coded audio data, and reproduces the original video signal and audio signal. The video signal reproduced by the decoder 15 is output from the video output terminal T12 after an OSD such as a program guide screen is superimposed on the video signal by the graphic processing means 16 or subjected to processing such as enlargement and reduction as necessary. You. The audio signal reproduced by the decoder 15 is output from an audio signal output terminal T13.
[0023]
The operation in the case where the data of the program selected by the user is stored in the storage means 14 and reproduced will be described below. When storing the program data, unlike the above-described reproduction, it is necessary to store not only the video and audio packets but also information such as PAT and PMT. This is necessary when reproducing the stored program data. When the stored program is reproduced, data relating to the program that has not been stored is not necessary. Conversely, if the data is not stored, it is necessary to select a program in accordance with the data. Only the information related to the video and audio of the selected program. That is, information that is not used such as NIT is not stored, and program-related information such as PAT and PMT is not stored as it is, but the control unit 12 controls the demultiplexer 11 so that the selected program can be stored. Data in which the contents of the packet are rewritten by deleting information other than information necessary for reproduction is stored.
[0024]
When an instruction to store a program is issued by a user operation, the control means 12 controls the demultiplexer 11 to output a data packet to be stored to the storage means controller 13. The storage means controller 13 adds the time information (time stamp) to the input data packet so that the data packet can be reproduced at the correct time at the time of reproduction, and records the data packet. FIG. 4 shows an example of data to which a time stamp is added. In the example of FIG. 4, the time stamp is added before the packet data, but this may be added after. The storage controller 13 stores the packet data with the time stamp as shown in FIG.
[0025]
Here, the control unit 12 uses the data amount of the program recorded in the storage unit 14, the position of the recorded area on the storage unit 14, and information about the program, that is, the program name and the date and time of reception as program designation data. It is recorded in an area different from the program data. Further, the control unit 12 also records, as management data of the storage unit 14, a capacity occupied by the data recorded in the storage unit 14 in the storage unit 14, a program list used when reproducing the stored program, and the like.
[0026]
The management data does not necessarily need to be recorded in the storage means 14. If the digital broadcast receiving, storing and reproducing apparatus 1 has a storage medium such as a flash memory having a sufficient storage capacity, it is stored in this storage. May be.
[0027]
The operation for reproducing the stored program data as described above will now be described. When the user performs a reproducing operation of the stored program, a reproducing command is input from the command input terminal T14. The control means 12 controls the storage means controller 13 in accordance with the reproduction command, causes the storage means 14 to read the program designation data, and analyzes the contents. The control means 12 controls the storage means controller 13 based on the data such as the area where the designated program data is stored in accordance with the analyzed contents, and causes the storage means 14 to read the data stored therein. The read program data is output from the storage means controller 13 to the demultiplexer 11 at a predetermined timing in accordance with the time stamp data described above.
[0028]
The demultiplexer 11 separates video / audio data from the input program data, and transfers the data to the decoder 15. The subsequent operation is the same as the operation at the time of reproduction described above. In this manner, the program data can be stored in the storage means 14 and reproduced.
[0029]
In the above description, the storage means 14 is, for example, an HDD, and if no processing is performed on the data to be stored when the data is removed by the user, the stored program data is illegally copied by connecting to a PC or the like. Can be used. On the other hand, there is a method of encrypting and recording data as in the example described below.
[0030]
An example of the configuration of the storage controller 13 when the data encryption function is provided will be described with reference to FIG. The storage unit controller 13 includes a time stamp adding unit 131 for adding a time stamp to each packet of the input transport stream, an encryption unit 132, and a data input / output controller 133 that controls input and output of data to and from the storage unit 14. Encryption / decryption means 134 for decrypting the encrypted data, timing adjustment means 135 for adjusting the timing of the input data based on the time stamp and outputting it as a transport stream, RAM (Random Access Memory) 1360, A RAM controller 136 that arbitrates data input / output with each block and manages writing and reading of data to and from the RAM 1360 is provided. The blocks are connected by a bus 130 for transferring commands and data.
[0031]
In FIG. 5, control signals are also exchanged between the RAM controller 136 and each block in order to control input / output of data in addition to data. In the description of FIG. 5, the reason why the RAM controller 136 is interposed in the data transfer between the blocks is to arbitrate the data transfer timing between the blocks that operate basically independently.
[0032]
The case where data is stored in the storage means 14 will be described below. The transport stream input from the demultiplexer 11 is input to the time stamp adding means 131, and a time stamp is added to each packet in a format as shown in FIG. 4, for example, and is output to the RAM controller 136. The RAM controller 136 temporarily stores the input data in the RAM 1360, and then reads and outputs the data according to a request from the encryption unit 132. The encryption unit 132 encrypts the input data according to a predetermined procedure, and outputs the data to the RAM controller 136. The RAM controller 136 temporarily stores the input data in the RAM 1360. After that, the data stored in the RAM 1360 is output according to a request from the data input / output controller. The data input / output controller 133 outputs the input data to the storage means 14 and stores it. By doing so, the inputted program data can be encrypted and stored.
[0033]
Next, a procedure for reading data stored in the storage means 14 will be described. When a data reproduction instruction is given from the control means 12 to the data input / output controller 133 via the bus 130, the data input / output controller 133 reads the stored data by controlling the storage means 14 and outputs the data to the RAM controller 136. Then, it is stored in the RAM 1360.
[0034]
The RAM controller 136 reads and outputs the data stored in the RAM 1360 in accordance with a data transfer request from the encryption / decryption means 134.
[0035]
The encryption / decryption means 134 decrypts the input encrypted data according to a predetermined procedure, decrypts the data before encryption, and outputs the data to the RAM controller 136.
[0036]
The RAM controller 136 temporarily stores the input data in the RAM 1360, and reads out and outputs the data from the RAM 1360 according to a data transfer request from the timing adjustment unit 135.
[0037]
The timing adjustment unit 135 outputs the input data in a transport stream format while adjusting the timing according to the time stamp added to the input data.
[0038]
With the configuration and operation described above, the transport stream input from the demultiplexer 11 can be stored in the storage unit 14 by managing the time information of each packet and encrypting the same. In addition, at the time of reproduction, the encrypted data is decrypted, the timing is adjusted according to the time stamp, and the data is output, so that the original transport stream can be reproduced.
[0039]
Next, the operation when the encoder 17 is used will be described. When the user performs a data compression operation using a remote controller (not shown) or the like, a corresponding compression command is input from the command input terminal T14. The control means 12 controls the encoder 17 to compress and encode the output video signal and the audio signal of the decoder 15 in accordance with the compression command. The compression-encoded data is output to the storage controller 13. The storage controller 13 stores the input compressed and encoded data in the storage 14.
[0040]
Here, the data compression encoding performed by the encoder 17 may be, for example, MPEG2 which is the same as the international standard received by broadcasting, or may be MPEG1 or MPEG4 which is another international standard. As a result, the video signal and the audio signal input to the encoder 17 are compression-encoded and can be stored in the storage unit 14 by the operation described above.
[0041]
Next, a method of shortening and recording an input program will be described below. Data transmitted by broadcasting is generally compression-encoded by MPEG2 which is an international standard. FIG. 6 shows an example of the configuration of video data in MPEG2. “I” is an I picture (Intra Picture) and can be decoded independently, “P” is a P picture (Predictive Picture) and is data that is decoded from the above I picture data by forward prediction, and “B” is It is a B picture (Bidirectional Picture) and is data that is decoded by bidirectional prediction using the above I picture and P picture.
[0042]
When all of these data are decoded, the video is reproduced at the same speed as the video before being encoded. On the other hand, for example, when only an I picture and a P picture are decoded or only an I picture, a P picture, and a part of a B picture are decoded, the time of the decoded video with respect to the original video before encoding is obtained. Can be accelerated, and a video signal similar to what is called fast-forwarding performed by a video tape recorder or the like can be obtained.
[0043]
FIG. 7 shows an example of the configuration of audio data in MPEG2. An AAU (Audio Access Unit) is a minimum unit that can be independently decoded into an audio signal, and includes, for example, a header, error check data, audio data, and ancillary data as data other than audio, as shown in FIG. When all the audio data having such a configuration is decoded, a voice having the same speed as before encoding is obtained. On the other hand, by performing processing such as decoding only three out of four AAUs, the original speed is reduced. Can be played fast.
[0044]
A specific method for performing the so-called fast-forward playback of the above-described video will be described below. Although not described in detail here, the video data includes various data indicating the attributes of the video data. Therefore, each of the I, P, and B pictures can be identified by identifying these attribute data. Here, when recording the video data in the storage means 14 in the storage means controller 13, each picture of I, P and B is identified, and the type of the video data and the positions of the first packet and the last packet are determined separately from the video data. Record.
[0045]
When the video data is read from the storage unit 14, the position of each picture can be known by first reading the data indicating the attribute and position of each recorded picture, whereby only an arbitrary picture can be read. By decoding the data of an arbitrary picture thus read out by the decoding means 16, a video can be reproduced at a desired reproduction speed.
[0046]
The same applies to audio, and the start and end positions of each frame can be known based on the header at the beginning of each frame shown in FIG. If data such as the start and end positions is separately recorded as in the case of the video, the position where each frame is recorded can be identified at the time of reproduction. Therefore, only arbitrary frame data can be read. By decoding the audio data read from the storage means 14 by the decoding means 16 in this manner, an audio signal can be reproduced at a desired reproduction speed.
[0047]
In the above description, an example in which only the data to be decoded is read out from the storage means 14 and so-called fast-forward reproduction is described, but this can also be realized by a method as described below. That is, the video data and the audio data are all read out from the storage means 14, but are not read out at the time interval according to the time stamp described with reference to FIG. Read at intervals. The data read in this way is decoded by the decoder 15.
[0048]
Here, in the case of normal decoding, time information (Presentation Time Stamp = PTS, Decoding Time Stamp = DTS) included in the input TS is compared with the value of an STC (System Time Clock) counter of the demultiplexer 11. Decoding is performed at a predetermined timing. On the other hand, video and audio can be decoded at a time interval faster than the original by controlling the STC counter to advance faster than the original data in accordance with the input data read at the faster time interval.
[0049]
The decoded video data is temporarily stored in a buffer memory for each frame, for example, and is output as a video signal at a predetermined timing according to a vertical synchronization signal and a horizontal synchronization signal. Here, fast-forward reproduction of a video can be performed by outputting all decoded video signal frames at appropriate intervals without outputting the frames.
[0050]
As for audio, signals may be decimated at appropriate time intervals as in the case of video, or may be read at a higher speed than a normal read speed. Either method can perform fast-forward playback of audio.
[0051]
Note that, in the case where the sound is output in a decimated state, noise may be generated due to a lack of data. In this case, noise reduction means 18 may be provided as shown in the example of FIG. Although the example of FIG. 8 has a configuration in which the audio noise of the audio signal input to the encoder 17 is reduced, the configuration is not necessarily limited to this configuration. Noise reduction means may be applied.
[0052]
In this way, the video signal and the audio signal which are so-called fast-forward reproduced are input to the encoder 17 and encoded. Here, the encoding format may be, for example, the same MPEG2 or a format according to another international standard such as MPEG1 or MPEG4. Even in the case of encoding by MPEG2, which is the same as the broadcast, the data is temporally compressed because the fast forward reproduction is performed at the time of input to the encoder 17, and the data amount is smaller than that at the time of receiving the broadcast. ing.
[0053]
Furthermore, for example, if the bit rate of the data is encoded so as to be lower than that when the broadcast is received, the capacity at the time of storage can be further reduced. Further, for example, when a broadcast signal is transmitted as a high-definition high-definition signal, the capacity required for storage can be further reduced by converting the broadcast signal into a signal of a lower definition video format in the graphic processing unit 16. . In this manner, the video data compressed and encoded by the compression encoding means (encoder) 17 after converting and reproducing the data by combining the data compression of the video and audio in the time axis direction and the reduction of the data amount by the resolution conversion of the video. By recording the audio data in the storage means 14, it is possible to store program data whose data volume is smaller than that at the time of broadcast reception.
[0054]
In the above description, program data is temporarily stored in the storage means 14 in order to perform so-called fast-forward reproduction of the decoded video signal and audio signal. This data may be left as original data, if necessary, or may be deleted from data that has been reproduced after storage. It is assumed that an HDD or a DVD-RAM (Digital Versatile Disc-Random Access Memory) or the like is used as the accumulating unit 14. However, these accumulating units are adapted to buffer the data rate of the program received by performing appropriate buffering. Since a sufficiently high access speed can be obtained, the operations of the two recording systems and one reading system in the above description can be apparently performed simultaneously. Therefore, when performing the fast-forward reproduction described above, it is not necessary to record and process all the program data once, and the necessary processing can be performed only by securing the necessary minimum data storage capacity. Can be used.
[0055]
A second embodiment of the present invention will be described with reference to FIG. 9 differs from the embodiment in FIG. 1 in that a network controller 19 is provided. The network controller 19 converts the output of the encoder 17 or the output data of the storage means controller 13 and sends the converted data from the output terminal T15 to the network 3 such as the Internet. The transmitted program data is received and reproduced by a portable receiver 5 having a display connected to the network 3 and user input means.
[0056]
As described in the first embodiment, the data input to the network controller 19 is data that has been compressed and encoded by the encoder 17 and has a low data rate. You can play it. Further, when the so-called fast-forward data recorded in the storage means 14 is viewed on the portable receiver 5 via the network 3, the transfer time can be shorter than when the data is reproduced at a normal speed. In general, it is desired that the portable receiver be small and light. However, in the configuration example shown in FIG. Can be reduced in size and weight. Also, in the case of viewing outdoors by the portable receiver 5, it is considered that there may be a case where the user watches the content in a short waiting time, for example. A user-friendly system that can be viewed and does not waste time can be configured. In the configuration of FIG. 9, the connection between the network 3 and the output terminal T15 and the connection between the network 3 and the portable receiver 5 may be either wired or wireless.
[0057]
FIG. 10 shows an example of a specific procedure when the program data is transferred from the digital broadcast reception / storage / playback apparatus 1 to the portable receiver 5 for viewing. First, the portable receiver 5 requests the digital broadcast receiving / storing / reproducing apparatus 1 to transfer a list of programs stored in the storage unit 14 via a network by a user's operation (S11). Here, the digital broadcast receiving / storage / playback apparatus 1 and the portable receiver 5 have, for example, a unique IP (Internet Protocol) address for specifying each device, and transfer data by designating the IP address. It exchanges data via a network.
[0058]
In response to the received request, the digital broadcast receiving / storage / playback apparatus 1 transfers a program list recorded in the storage means 14 or another storage medium to the portable receiver 5 via the network (S12).
[0059]
The portable receiver 5 receives the program list and displays it on the display (S13). The user operates the input means to select a program desired to be viewed from the programs displayed on the display (S14). When a program is selected, the portable receiver 5 transfers a transmission request for the selected program to the digital broadcast receiving, storing, and reproducing apparatus 1 via a network (S15).
[0060]
Upon receiving the program transmission request, the digital broadcast receiving / storage / playback apparatus 1 plays the selected program from the storage means 14 (S16), and transfers it to the portable receiver 5 via the network 3 by the network controller 19 (S17). ).
[0061]
The portable receiver 5 receives the transferred program, performs necessary decoding processing and the like to reproduce the program, and the viewer watches the program (S18).
[0062]
This allows the portable receiver 5 to view the program reproduced by the digital broadcast receiving, storing and reproducing apparatus 1 and transmitted to the network. By doing so, the portable receiver 5 does not need to store the program data in advance, so there is no need to provide a large-capacity and costly storage medium, and it is possible to reduce the weight and cost. Further, when both the program data compressed in the time axis direction and the data not compressed in the time axis direction are recorded in the digital broadcast receiving / accumulating / reproducing apparatus 1 as described above, the digital broadcast receiving / accumulating / reproducing apparatus 1 has a disadvantage in that the user cannot view the program. The program to be transferred can be selected according to the situation. That is, the user can view the program data compressed in the time axis direction when he / she wants to view in a short time, and watch the data at the normal reproduction speed without compression in the time axis direction when there is enough time.
[0063]
In the above embodiment, encrypted program data may be transmitted to the portable receiver 5 for the purpose of protecting copyright or preventing unauthorized use. In order to transmit the encrypted data, the encrypted data stored in the configuration described with reference to FIG. 5 may be transmitted without being decrypted. That is, the data read from the storage means 14 is output via the bus 130 without passing through the encryption / decryption means 134 or to a dedicated signal line (not shown), and the transferred data is sent to the network controller 19 in FIG. By inputting, the encrypted data can be transferred to the portable receiver 5 via the network 3.
[0064]
In the above, in order to view the data encrypted by the portable receiver 5, key data for decrypting the data is required. The portable receiver 5 registers itself in the digital broadcast receiving / storing / reproducing apparatus 1 and acquires an encryption key, for example, by the processing procedure shown in FIG.
[0065]
The portable receiver 5 that wants to obtain the encryption key transmits a device registration request to the digital broadcast receiving / storage / playback apparatus 1 together with identification information such as a password set by the user (S21).
[0066]
Upon receiving the device registration request, the digital broadcast receiving / storage / playback device 1 authenticates and registers the portable receiver 5 as a device that permits decryption based on identification information such as a password (S22), and registers the registered device code and registration completion. The notification is sent to the portable receiver 5 (S23).
[0067]
The portable receiver 5 transmits the encryption key transfer request to which the received device code has been added to the digital broadcast receiving, storing, and reproducing apparatus 1 (S24).
[0068]
The digital broadcast receiving, storing and reproducing apparatus 1 checks the received device code (S25), and transfers the encryption key to the portable receiver 5 when the portable receiver 5 is a device that permits decryption (S26).
[0069]
In this way, by passing the encryption key only to the registered device, the stored program data can be viewed safely while preventing unauthorized use on the network or unregistered device.
[0070]
As a specific method of the device registration and the key data transfer, for example, a wired connection using a USB (Universal Serial Bus) or a wireless connection such as an infrared ray or an IEEE 182.15.1 (= Bluetooth) is used. Good. This makes it possible to prevent unauthorized use of program data and to construct a user-friendly program data viewing system.
[0071]
【The invention's effect】
As described above, according to the present invention, the received program data can be compressed and encoded with a small capacity after being set in a so-called fast forward state in which the received program data is compressed in the time axis direction, so that efficient accumulation can be performed. .
[0072]
Further, according to the present invention, the program data is compressed in the time axis direction, and the data further compressed and encoded can be transferred to the portable receiver via the network for viewing, so that the data transfer time can be shortened. It can be used as an easy-to-use program viewing system.
[0073]
Further, according to the present invention, a program can be encrypted and recorded, or can be transferred via a network, and the data transferred via the network can be transmitted to a specific portable receiver registered in a digital broadcast receiving, storing and reproducing apparatus. , The copyright can be effectively protected to prevent unauthorized use of the program data.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a digital broadcast receiving, storing and reproducing apparatus according to the present invention.
FIG. 2 is a diagram showing an example of a packet arrangement of a stream to be processed in the present invention.
FIG. 3 is a diagram showing a program selection procedure of the digital broadcast receiving, storing and reproducing apparatus according to the present invention.
FIG. 4 is a diagram showing an example of a stored data format in the digital broadcast receiving, storing and reproducing apparatus according to the present invention.
FIG. 5 is a diagram showing a configuration example of a storage means controller in the digital broadcast receiving, storing, and reproducing apparatus according to the present invention.
FIG. 6 is a diagram showing a configuration example of a video signal in MPEG2 which is an international standard.
FIG. 7 is a diagram showing a configuration example of an audio signal in MPEG2 which is an international standard.
FIG. 8 is a diagram showing an embodiment of a digital broadcast receiving, storing and reproducing apparatus according to the present invention.
FIG. 9 is a diagram showing an embodiment of a digital broadcast receiving, storing and reproducing apparatus according to the present invention.
FIG. 10 is a diagram showing an example of a program data transfer procedure in the digital broadcast receiving, storing and reproducing apparatus and the portable receiver according to the present invention.
FIG. 11 is a diagram showing an example of an encryption key transfer procedure in the digital broadcast receiving, storing and reproducing apparatus according to the present invention.
FIG. 12 is a diagram illustrating a configuration example of a receiving apparatus including a storage unit according to a conventional example.
[Explanation of symbols]
1 Digital broadcast receiving, storing and reproducing device
3 network
5 Portable receiver
11 Demultiplexer
12 control means
13 Storage means controller
131 Time stamp adding means
132 encryption means
133 data input / output controller
134 encryption / decryption means
135 Timing adjustment means
136 RAM controller
1360 RAM
14 Storage means
15 Decoder
16 Graphic processing means
17 Encoder
18 Noise reduction means
19 Network Controller
T11 stream input terminal
T12 Video signal output terminal
T13 Audio signal output terminal.
T14 Command input terminal
T15 Data input / output terminal

Claims (10)

Storage means for storing and reproducing input data and outputting reproduced data;
A storage controller for controlling data input / output to / from the storage;
Decoding means for decoding the output data of the storage means and outputting video and audio;
Compression encoding means for compressing and encoding the output of the decoding means and outputting the result to the storage means controller;
In a digital broadcast receiving, storing and reproducing apparatus having control means for controlling the storage means, the storage means controller, the decoding means, and the compression / encoding means, the storage means controller and the decoding means include a storage means, Video and audio obtained by decoding the data from the decoder and the decoding processing by the decoding means perform compression processing in the time axis direction so as to be faster than the original reproduction speed of the video and audio, and the compression encoding means A digital broadcast receiving, storing, and reproducing apparatus for compressing and encoding video and audio compressed in a time axis direction and storing the compressed video and audio in the storage means. 2. The digital broadcast receiving / storing / reproducing apparatus according to claim 1, wherein the storage means controller records the stored data after encrypting the data with unique key information. 2. The digital broadcast receiving / accumulating / reproducing apparatus according to claim 1, wherein after compressing and encoding the data, the data accumulated in the accumulation means used for the compression encoding is deleted. 2. The digital broadcast receiving / accumulating / reproducing apparatus according to claim 1, further comprising noise reduction means for reducing noise of an audio signal reproduced at a speed higher than the original reproduction speed by compressing in the time axis direction. Storage means for storing and reproducing input data and outputting reproduced data;
A storage controller for controlling data input / output to / from the storage;
Decoding means for decoding the output data of the storage means and outputting video and audio;
Compression encoding means for compressing and encoding the output of the decoding means and outputting the result to the storage means controller;
Network control means for sending data reproduced from the storage means to a communication line;
In the digital broadcast receiving / storage / playback apparatus having control means for controlling the storage means, the storage means controller, the decoding means, the compression / encoding means, and the network control means,
The storage unit controller and the decoding unit are configured to operate in the time axis direction such that the video and audio obtained by the data reproduction from the storage unit and the decoding process by the decoding unit have a higher speed than the original reproduction speed of the video and audio. Wherein the compression encoding means compresses and encodes the video and audio compressed in the time axis direction and accumulates them in the accumulation means. The storage unit controller encrypts the stored data with unique key information and records the encrypted data, and transfers the unique key information to an external device that is connected to the digital broadcast receiving, storing, and reproducing apparatus of the present invention by wire or wirelessly. The digital broadcast receiving, storing and reproducing apparatus according to claim 5, wherein: 7. The digital broadcast according to claim 6, wherein the digital broadcast reception / storage / playback apparatus has a function of authenticating a device connected by wire or wirelessly, and transfers key information only to an authenticated external device. Receiving storage playback device. 6. The digital broadcast receiving / accumulating / reproducing apparatus according to claim 5, wherein after compressing and encoding the data, the data accumulated in the accumulating means is deleted for the compression encoding. 6. The digital broadcast receiving / accumulating / reproducing apparatus according to claim 5, further comprising noise reduction means for reducing noise of an audio signal reproduced at a speed higher than the original reproduction speed by compressing in the time axis direction. A portable receiver having a function of receiving and viewing program data via a network, and authenticating from an external device by transferring at least device-specific information and information set by a user to the external device by wire or wireless means. Received and authenticated, receive and store decryption key data of the program data from the external device by the wired or wireless means, receive the encrypted program data via a network, A portable receiver, wherein the program is viewed by decrypting the encryption using the decryption key data.

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