JP3815361B2 - Digital broadcast signal receiving and recording / reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a television signal receiving and recording / reproducing apparatus, and more particularly to a digital broadcast signal receiving and recording / reproducing apparatus that records and reproduces a digital signal as it is.
[0002]
[Prior art]
As a conventional technique for recording and reproducing a digital signal, a receiving system and a recording / reproducing apparatus for receiving and recording a digital signal transmitted by multiplexing a plurality of pieces of information are described in JP-A-8-98164. . The prior art comprises a receiving means for receiving a digital information signal transmitted by multiplexing a plurality of pieces of information and selecting desired information, and a recording means for recording the information received by the receiving means. A receiving system is described. Japanese Patent Application Laid-Open No. 8-56350 describes a technique for selecting a desired program when receiving a digital signal transmitted by multiplexing a plurality of pieces of information and presenting the program. In the prior art, a plurality of programs are each packetized with a packet identifier added thereto, and transmission control data indicating a correspondence relationship between the program and the packet identifier is also packetized, and each of these packets is multiplexed. An apparatus for searching for each program from the multiplexed signals transmitted in this manner is described.
[0003]
[Problems to be solved by the invention]
In the prior art described in the above-mentioned Japanese Patent Laid-Open No. 8-98164, there is no description about a method of reproducing only information related to a desired program from information multiplexed when the recorded program is reproduced. On the other hand, the prior art described in JP-A-8-56350 describes search means for extracting a desired signal from a multiplexed digital signal and presenting it. However, for example, when a program recorded on a conventional analog VTR is to be reproduced, it is generally possible to reproduce the program without any other operation by simply pressing a reproduction switch. Even when the digital information signal technique described in Japanese Patent Laid-Open No. 8-98164 is combined with the technique described in Japanese Patent Laid-Open No. 8-56350, a troublesome operation such as searching for a program must be performed for reproduction. In other words, a method of reproducing a desired program immediately recorded by simply pressing one switch as in the analog type VTR described above cannot be realized.
[0004]
It is an object of the present invention to provide a receiving apparatus capable of reproducing a program recorded as a digital signal without troublesome operations.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, for example, it may be configured as in the claims.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 is a block diagram of a digital broadcast signal receiving and recording / reproducing apparatus according to the present invention. In the following description, an example in which the antenna 300 receives a satellite broadcast radio wave digitally modulated by a quadrature phase shift keying (hereinafter abbreviated as QPSK) method is shown, but this limits the transmission method used in the present invention to satellite broadcast. The modulation method is not limited to the QPSK method. In addition, an example using the international standard Moving Picture Experts Group 2 (hereinafter abbreviated as MPEG2) is shown as a signal compression and decompression method, but this does not limit the signal compression and decompression method used in the present invention to MPEG2. Absent.
[0008]
In FIG. 1, 300 is an antenna, 301 is a converter that converts received radio waves into a tuner input signal, 302 is a cable, 401 is a tuner, 402 is a QPSK demodulator, and 403 is a forward error correction that corrects an error in a signal accompanying transmission. (Hereinafter abbreviated as FEC) 414 and 424 are switches, 413 is a second demultiplexing unit, 423 is a signal recording / reproducing means, 404 is a first demultiplexing unit, 405 is an MPEG2 decoder, 406 is a video encoder, 407 Is a D / A converter, 408 is an On Screen Display (hereinafter abbreviated as OSD), 409 is a control means, 410 is a television, and 434 and 415 are developed by the first demultiplexer 404 and the MPEG2 decoder 405, respectively. RAM (Random Access Memory) 419 for storing the operation program of the control means 409 (ROM) Read Only Memory).
[0009]
In FIG. 1, a radio wave transmitted from a satellite (not shown) is received by an antenna 300, converted into a tuner input signal by a converter 301, and input to a tuner 401 via a cable 302. In the example shown in FIG. 1, the tuner 401 selects and outputs a desired signal from the input signal according to the setting of the control means 409. The output of the tuner 401 is demodulated by the QPSK demodulation circuit 402 and input to the FEC 403. The FEC 403 performs error correction of an input digital signal accompanying transmission.
[0010]
The operation when the digital signal obtained by performing error correction of the input signal as described above is input to the first demultiplexing unit 404 via the switches 414 and 424 will be described. The satellite digital broadcasting described in the present invention has a feature that a plurality of programs can be multiplexed on one radio wave relayed by a radio wave transponder (not shown) generally mounted on the satellite. The first demultiplexing unit 404 selects a desired program from among the multiplexed programs. The signal separated by the first demultiplexing unit 404 is input to the MPEG2 decoder 405. The MPEG2 decoder 405 reproduces the digital video signal and the digital audio signal before compression by expanding the compressed digital signal. The reproduced digital video signal is input to the video encoder 406 via the OSD circuit 408, and the digital audio signal is input to the D / A converter 407. The video encoder 406 converts the input digital video signal into an analog video signal and outputs it to the television 410. On the other hand, the D / A converter 407 converts the input digital audio signal into an analog audio signal and outputs it to the television 410. The above operation is controlled by the control means 409 that operates according to a program stored in the ROM 419.
[0011]
In the above description, an example of a general procedure for separating desired program information in the first demultiplexing unit 404 will be described with reference to FIGS. The signal input to the first demultiplexing unit 404 has a configuration in which the packets shown in FIG. An example of multiplexing is shown in FIG. The multiplexed signal as shown in FIG. 2B is processed by the first demultiplexing unit 404 to perform the operation described below. An example of the operation in the demultiplexing unit is shown in FIG. First, in step 201, the program channel of the program that the viewer wants to watch is input. An organized channel is a collective term for video, audio, and the like constituting one program, and corresponds to a television channel in conventional analog broadcasting. In digital broadcasting, generally, one frequency in which a plurality of programs are multiplexed is called a physical channel. Next, in step 202, a PAT (Program Association Table) included in the currently received multiplexed signal (= Transport Stream, hereinafter referred to as TS) is received. The PAT is one of tables in PSI (Program Specific Information) defined by the MPEG2 standard which is an international standard. In step 203, a desired knitting channel is searched from the PAT received in step 202. If there is a desired knitting channel, the process proceeds to step 207. If there is no desired formation channel, the process proceeds to step 204, where one of the PSIs is received, a NIT (Network Information Table) describing the relationship between the formation channel and the physical channel, and the desired formation channel is included. A physical channel is acquired, and the next step 205 moves to the physical channel acquired in step 204. In the actual circuit, the transition of the physical channel is performed by setting a frequency to be selected from the control means 409 to the tuner 401 as shown in FIG. Thereafter, in step 206, the PAT of the TS in the physical channel after the transition is received. When the PAT is received, the PMT (Packet ID) of the PMT (Program Map Table) in which the PIDs such as video and audio constituting the organization channel input in Step 207 are described is obtained from the PAT, and the PMT having the PID is obtained. Receive. However, the PMT is one of the PSI tables, and the PID is a packet identifier included in the packet header. Since the PMT describes PIDs such as PCR (Program Clock Reference) indicating the video, audio and time information constituting each organization channel included in the TS being received, the video and audio of the desired program in step 208 PID such as PCR is acquired. Thereafter, the obtained PID is set in the first demultiplexing means 404 in step 209, and a desired video and audio stream is received and input to the MPEG2 decoder 405 for decoding.
[0012]
The video signal decoded by the operation described above is processed by the NTSC encoder via the OSD 408 and converted into an analog signal, and the audio signal is converted into an analog signal by the D / A converter 407 and input to the television 410. The viewer can present the desired program.
[0013]
Next, a procedure for recording the received signal in the recording / reproducing means 423 through the switch 414 and the second demultiplexing unit 413 and reproducing the recorded signal from the recording / reproducing means 423 through the switch 424 will be described.
[0014]
When a signal is recorded on the recording / reproducing unit 423, the switch 414 is switched to connect the FEC 403 and the second demultiplexing unit 413 according to the control from the control unit 409. The second demultiplexing unit 413 is means for extracting only data necessary for the viewer to reproduce only a desired program during reproduction after recording. In the embodiment of FIG. 1, in addition to the above-described TSs such as PAT, PMT, video and audio, PCR (Program Clock Reference) which is data indicating time information required by the MPEG2 decoder 405, and program related information Of these, only information relating to a desired program (currently viewed program) is extracted.
[0015]
An example of the configuration of the second demultiplexing unit 413 is shown in FIG. In FIG. 13, a demultiplexing unit 4131 for extracting desired information and a speed converting unit 4132 for converting the transmission rate of the output signal of the demultiplexing unit 4131 so as to be compatible with the recording / reproducing unit. Specifically, the speed conversion means 4132 is, for example, a FIFO (Fast in Fast Out) memory.
[0016]
Furthermore, another configuration example of the second demultiplexing unit 413 is shown in FIG. In FIG. 14, 4133 is an interface means between the second demultiplexing unit 413 and the recording / reproducing means 423. For example, when the signal output from the speed converting means 4132 is a parallel signal, it is a means for converting it into a serial signal. is there. The signal extracted by the second demultiplexing unit 413 having the configuration shown in FIG. 13 or FIG. 14 is recorded in the recording / reproducing means 423. At the time of reproduction, the signal reproduced by the recording / reproducing unit 423 is input to the demultiplexing unit 404 via the switch 424. When the signal recorded in the recording / reproducing means 423 is reproduced, the demultiplexing means 404 is controlled by the control means 409 and operated according to the procedure shown in FIG. Hereinafter, the operation will be described. In general, the PID indicating program-related information is indicated by a specific value regardless of the program, and this embodiment will be described based on this assumption.
[0017]
When a signal is input from the recording / reproducing means 423, the first demultiplexing means 404 first receives the desired program related information as shown in step 441 in accordance with the control from the control means 409, and converts it into the desired program related information. Get the number of the organization channel being described. Next, in step 442, the PAT is received. Since the channel number of the organization channel recorded at this stage is known in step 441, in the next step 443, the PID of the PMT in which the PID of the recorded program such as video and audio is described can be obtained immediately. The following procedure is the same as that described in FIG.
[0018]
As described above, in the present embodiment, the program reproduced from the recording / reproducing means 423 which recorded the program in the state of the multiplexed digital signal is immediately demultiplexed and decoded without a complicated operation by the viewer. Can be presented. Furthermore, since the desired program related information is recorded, it is possible to enhance the service using information related to the program, which is one of the features of digital broadcasting.
[0019]
A second embodiment of the present invention will be described with reference to FIG. In the embodiment of FIG. 1, only the desired program information is extracted by the second demultiplexing unit 413. However, in the embodiment of FIG. 5, it is not distinguished whether the information is related to the desired program. In this configuration, all program related information is extracted and recorded.
[0020]
FIG. 6 shows a procedure for processing the reproduction signal from the recording / reproducing means 423 when the configuration of the embodiment of FIG. 5 is used. The procedure of FIG. 6 eliminates the procedure for acquiring the organization channel from the desired program-related information in step 441 in the procedure shown in FIG. 4, and the organization channel information matches the PMT in which the PID described in the PAT is recorded. It is checked in step 601 whether or not to do so. If they do not match, the operation of step 601 is repeated until they match, and if they match, the operation moves to step 602. The subsequent operation is the same as that after step 443 in FIG.
[0021]
According to the embodiment of FIG. 5, the circuit configuration of the second demultiplexing unit 413 can be simplified as compared with the case of the embodiment of FIG. It is possible to enhance the service by using information about the program described.
[0022]
FIG. 7 shows a third embodiment of the present invention. The embodiment of FIG. 7 is different from the embodiment of FIG. 5 in that the program related information is not extracted, but only PAT, PMT, PCR, video and audio data are extracted. Thereby, the configuration of the second demultiplexing unit 413 can be further simplified than in the case of the embodiment of FIG.
[0023]
FIG. 8 shows a fourth embodiment of the present invention. The embodiment of FIG. 8 differs from the embodiment of FIG. 1 in that only the PMT, PCR, video, and audio are extracted by the second demultiplexing unit 413 and the PID rewriting means 433 is provided. That is, in the embodiment of FIG. 8, the PID rewriting unit 433 rewrites the PID of the PMT to a specific value set by the control unit 409 and records the signal on the recording / reproducing unit 423. As a result, when the recorded signal is reproduced, the PID of the PMT is known in advance, so that the video, audio and PCR PID described in the PMT can be obtained immediately and used in the same manner as in the embodiment of FIG. Can be immediately played back without complicated operations.
[0024]
FIG. 9 shows a fifth embodiment of the present invention. The embodiment of FIG. 9 differs from the embodiment of FIG. 8 in that only the information of PCR, video, and audio is extracted by the second demultiplexing unit 413 and the PCR, video, and audio of PID rewriting means 433 are extracted. The PID is rewritten to a specific value set from the control unit 409.
[0025]
According to the embodiment of FIG. 9, since the recorded PIDs of PCR, video, and audio are known in advance at the time of reproduction, the user can immediately reproduce without complicated operations as in the embodiment of FIG. In addition, the amount of information to be recorded can be reduced as compared with the embodiment of FIG. 8, and the configuration of the second demultiplexing unit 413 can be simplified.
[0026]
FIG. 10 shows a sixth embodiment of the present invention. The embodiment of FIG. 10 differs from the embodiment of FIG. 9 in that a packet insertion unit 453 is provided instead of the PID rewriting unit 433. In the embodiment of FIG. 10, the second demultiplexing unit 413 acquires the PID of each piece of information such as desired PCR, video, audio, etc. and extracts the PCR, video, audio, etc. and inputs them to the packet insertion means 453. . The packet insertion unit 453 creates and inserts a packet describing the PID such as PCR, video, and audio acquired in the second demultiplexing unit 413 in the input signal from the second demultiplexing unit 413, and records / reproduces the unit 423. To record. When reproducing the recorded signal, the first demultiplexing means 404 first controls the control means 409 so as to receive the packet inserted by the packet inserting means 453, and the PCR and video described in this are controlled. Since the PID such as voice is acquired, a desired program can be presented immediately without complicated operations by the user as in the embodiment of FIG. In the above description, the PID of the packet inserted by the packet insertion unit 453 may be assigned the same PID as the PAT defined in the MPEG2 standard. The MPEG2 standard stipulates that the PAT PID is a specific value. Therefore, when the first demultiplexing means 404 processes the signal reproduced from the recording / reproducing means 423, the control means 409 First, the operation described with reference to FIG. 10 can be realized by setting in advance to control the first demultiplexing unit 404 so as to extract a packet having the same PID as the PAT.
[0027]
As described above, by using the embodiment of FIG. 10, a desired program can be presented immediately without complicated operations by the user.
[0028]
FIG. 11 shows a seventh embodiment of the present invention. In FIG. 11, reference numeral 463 denotes transmission rate detection means. In FIG. 11, the second demultiplexing means 413 extracts additional data such as program information together with information such as video / audio, as in the case of the embodiment of FIG. 1 or FIG. The TS output from the second demultiplexing unit 413 is input to the transmission rate detecting unit 463. When the transmission rate detection unit 463 detects that the transmission rate of the input TS exceeds a preset specific value, the transmission rate detection unit 463 informs the control unit 409 that the transmission rate has exceeded a preset value. Outputs a notification signal. When the notification signal from the transmission rate detection means 463 is input, the control means 409 controls the second demultiplexing means 413 to extract information that does not directly affect the presentation of the program according to the preset priority. Control not to. That is, for example, when the transmission rate of the TS output from the second demultiplexing unit 413 exceeds a preset value, for example, the multiplexing output from the second demultiplexing unit 413 is stopped by stopping the extraction of program information. The signal transmission rate is set to a certain value or less.
[0029]
As described above, in the embodiment of FIG. 11, for example, when a recording unit having an upper limit on the transmission rate of a multiplexed signal that can be recorded is used as the recording / reproducing unit 423, a multiplexed signal to be recorded is set in advance. As long as the transmission rate does not exceed the specified transmission rate, additional information such as program information can be recorded along with information such as video and audio that make up the program to increase added value, and the transmission rate of the multiplexed signal to be recorded is set in advance. The program information can be recorded by stopping the extraction of the information that is not directly related to the presentation of the program contents even when the program content is exceeded.
[0030]
FIG. 12 shows an eighth embodiment of the present invention. In FIG. 12, reference numeral 473 denotes switch means. In FIG. 12, the second demultiplexing means 413 extracts recording-related information related to copyright protection and the like, and if information indicating that recording is prohibited is extracted as the recording-related information, the control means 409 The switch means 473 is controlled to detect that the information for prohibiting is extracted, so that the signal output from the second demultiplexing means 413 is not applied to the recording / reproducing means 423.
[0031]
That is, by using the embodiment of FIG. 12, when a signal to which information for prohibiting recording is added for the purpose of copyright protection or the like is transmitted on the transmission side, an operation according to this can be performed.
[0032]
In the embodiment of FIG. 12, an example in which the switch means 473 is provided to prohibit recording is shown, but a part of the second demultiplexing means 413 (such as the speed converting means 4132) or the control means 409 or It is clear that the same effect can be selected by controlling to stop all the operations.
[0033]
In the embodiment, the first demultiplexing unit 404 and the second demultiplexing unit 413 have been described as separate circuits. However, these two units may be the same circuit block.
As described above, by using the configuration of the above embodiment, even when the information amount of the transmitted signal is different from the information amount that can be recorded in the recording / reproducing apparatus, the digital signal relating to a desired program or the like is selectively used. Can be recorded, and the recorded program can be reproduced immediately without performing complicated operations.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the receiver which can reproduce | regenerate the program recorded with the digital signal without a troublesome operation can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention. FIG. 2 is a diagram showing a packet structure and a packet multiplexing method. FIG. 3 is a diagram showing a program presentation procedure. FIG. 5 is a diagram showing a configuration of a second embodiment of the present invention. FIG. 6 is a diagram showing a procedure of program presentation. FIG. 7 is a diagram showing a configuration of a third embodiment of the present invention. 8 is a diagram showing a configuration of a fourth embodiment of the present invention. FIG. 9 is a diagram showing a configuration of a fifth embodiment of the present invention. FIG. 10 is a diagram showing a configuration of a sixth embodiment of the present invention. 11 is a diagram showing a configuration of a seventh embodiment of the present invention. FIG. 12 is a diagram showing a configuration of an eighth embodiment of the present invention. FIG. 13 is a configuration of a second demultiplexing means of the present invention. FIG. 14 is a diagram showing one configuration of the second demultiplexing means of the present invention.
DESCRIPTION OF SYMBOLS 300 ... Antenna 301 ... Converter 302 ... Cable 401 ... Tuner 402 ... QPSK demodulation circuit 403 ... FEC 404 ... Demultiplexing part 405 ... MPEG2 decoder 406 ... Video encoder 407 ... D / A converter 408 ... OSD 409 ... Control means 410 ... Television 413 ... second demultiplexing unit 423 ... recording / reproducing means 433 ... PID rewriting means 453 ... packet inserting means 414, 424 ... switch 415434 ... RAM 419 ... ROM

Claims (3)

A receiving device for receiving a digital signal in which a plurality of programs are multiplexed and transmitted in a packet format,
Receiving means for receiving and demodulating the transmitted digital signal;
Separating means for separating a video signal or an audio signal from a signal demodulated in the receiving means;
From the video signal or audio signal separated by the separation means, only a signal necessary for reproducing a desired program after recording is extracted, and PID rewriting means for rewriting the PID of the extracted signal to a predetermined value;
Control means for controlling to record the PID rewritten by the PID rewriting means and the video signal or audio signal separated by the separating means in a recording means for recording the video signal or the audio signal;
Receiving apparatus comprising: reproducing means for reproducing a signal recorded in the recording means using the rewritten PID. The receiving device according to claim 1,
The separation means separates time information related to the desired program together with the video signal and audio signal of the desired program,
The control means extracts time information necessary for reproducing a desired program after recording not only from the video signal or audio signal but also from the time information, and newly describes a PID of the extracted time information. A receiving apparatus that controls to insert a packet and record it in the recording means. The receiving device according to claim 2,
The time information is a PCR (Program Clock Reference) in MPEG2.

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