(12)Un1ted States Patent
`Hatanaka et al.
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 6,397,000 B1
`May 28, 2002
`
`US006397000B1
`
`(54) DIGITAL SIGNAL RECORDING DEVICES,
`
`DEVICES, AND DIGITAL SIGNAL
`
`DEVICES
`
`(75)
`
`Inventors: Yuji Hatanaka; Hiroo Okamoto, both
`of Yokohama (JP)
`
`(73) Assignee: Hitachi, Ltd., Tokyo (JP)
`
`( * ) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21) Appl. No.: 09/090,919
`
`(22)
`
`Filed:
`
`Jun. 5, 1998
`
`(30)
`
`Foreign Application Priority Data
`
`Sep. 9, 1997
`
`(JP)
`
`........................................... .. 9—243667
`
`Int. Cl.7 ................................................ .. H04N 5/91
`(51)
`
`............ ..
`.. 386/98; 386/111; 386/124
`(52) U.S. Cl.
`(58) Field of Search ............................... .. 386/131, 124,
`386/112, 109, 98, 111, 348/441, 536, 554,
`542, 510, 705, 706, 521, 522, H04N 5/91
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`............ .. 386/131
`7/1997 Tomita et al.
`5,649,048 A *
`348/706
`8/1998 Kummer et al.
`5,790,202 A *
`386/131
`5,832,085 A : 11/1998 Inoue et al.
`....... ..
`3::/:32
`21332331:
`4 112:: 1:21:11
`5:995:705 A * 11/1999 Lang ......................... .. 386/46
`6,052,506 A
`4/2000 Fukushima et al.
`FOREIGN PATENT DOCUMENTS
`
`
`
`JP
`
`8—98164
`
`4/1996
`
`* cited by examiner
`
`Primary Examiner—Vincent F. Boccio
`(74) Attorney, Agent, or Firm—Antonelli, Terry, Stout &
`Kraus, LLP
`
`(57)
`
`ABSTRACT
`
`In a recording device, a recording and playback device and
`a receiving, recording and playback device in a system for
`receiving, recording and playing back a digital signal, a
`digital signal recording and playing back device having the
`function of converting an analog television signal to a digital
`television signal, and recording and reproducing the digital
`signal includes A/D converters for an analog video signal
`and an analog audio signal, encoders for compressing the
`analog video and audio signals, encoders for compressing
`the video and audio signals, a multiplexer for multiplexing
`the compressed video and audio signals, and a selector for
`selecting one of a received digital signal and the compressed
`multiplexed signal.
`
`5,555,097 A *
`
`9/1996 Joung et al.
`
`.............. .. 386/131
`
`3 Claims, 9 Drawing Sheets
`
`11
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`LG Ex. 1006, pg 1
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`

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`U.S. Patent
`
`May 28, 2002
`
`Sheet 1 of 9
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`U.S. Patent
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`May 28, 2002
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`Sheet 7 of 9
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`U.S. Patent
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`May 28, 2002
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`Sheet 9 of 9
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`
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`

`
`US 6,397,000 B1
`
`1
`
`DIGITAL SIGNAL RECORDING DEVICES,
`DIGITAL SIGNAL RECORDING/ PLAYBACK
`DEVICES, AND DIGITAL SIGNAL
`RECEIVING/RECORDING/PLAYBACK
`DEVICES
`
`BACKGROUND OF THE INVENTION
`
`The present invention relates to digital signal recording
`devices, digital signal recording/playback devices, and digi-
`tal signal receiving/recording/playback devices,
`for
`receiving/recording/playing back a digital signal.
`JP-A-8-98164 discloses a receiving system and a
`recording/playing back device for receiving/recording a
`transmitted multiplexed digital signal as a conventional
`technique for recording/playing back a digital signal. This
`prior art publication describes a receiving system which
`includes receiving means for receiving a transmitted multi-
`plexed digital information signal and for selecting desired
`information, and recording means for recording the infor-
`mation received by the receiving means.
`This prior art system is capable of recording/playing back
`an incoming digital signal as it is, but it cannot convert an
`analog television signal like terrestrial broadcasting waves
`used at present to a digital signal, and record/play back the
`digital signal.
`SUMMARY OF THE INVENTION
`
`It is therefore an object of the present invention to provide
`a digital signal receiving device, a digital signal recording/
`playing back device and a digital signal receiving/recording/
`playing back device, having the functions of converting an
`analog television signal to a digital signal, and recording/
`playing back the digital signal in a digital signal receiving/
`recording/playing back system.
`According to one aspect of the present invention, there is
`provided a digital signal recording device comprising:
`a digital input means for inputting to the recording device
`a digital signal indicative of video, audio, data and so
`forth multiplexed in a predetermined packet form;
`an analog video signal
`input means for inputting an
`analog video signal to the recording device;
`an analog audio signal
`input means for inputting an
`analog audio signal to the recording device;
`a video A/D converter for converting the analog video
`signal inputted by the analog video signal input means
`to a digital signal;
`a video encoder for information-compressing the digital
`video signal to which the analog video signal is con-
`verted by the video A/D converter;
`an audio A/D converter for converting the analog audio
`signal inputted by the analog audio input means to an
`digital signal;
`an audio encoder for information-compressing the digital
`audio signal to which the analog audio signal is con-
`verted by the audio A/D converter;
`a multiplexing means for multiplexing at least the video
`signal compressed by the video encoder and the audio
`signal compressed by the audio encoder into a multi-
`plexed signal of a predetermined packet form; and
`a record selecting means for selecting one of the digital
`signal
`inputted by the digital
`input means and the
`multiplexed digital signal provided by the multiplexing
`means; and
`a recording means for recording the digital signal selected
`by the record selecting means
`
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`2
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a block diagram of a first embodiment of the
`present invention;
`FIG. 2 illustrates a packet composition and a packet
`multiplexing system.
`FIGS. 3A and 3B each show a block format
`
`in the
`
`recording device;
`FIG. 4 shows a track format in the recording device;
`FIGS. 5A—5E each are a timing chart indicative of a
`packet multiplexed output in a multiplexer;
`FIG. 6 is a block diagram of a second embodiment of the
`present invention;
`FIGS. 7A—7D each are a timing chart indicative of a
`packet multiplexed output in a multiplexer of the second
`embodiment;
`FIG. 8 is a block diagram of an arrangement which uses
`a bus for transmission of signals.
`FIG. 9 is a block diagram of a third embodiment of the
`present invention; and
`FIG. 10 is a block diagram of a fourth embodiment of the
`present invention.
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`
`Embodiments of the present invention will be described
`next with reference to the accompanying drawings.
`FIG. 1 is a block diagram of a receiving/recording/playing
`back device for a digital broadcasting signal
`in a first
`embodiment of the present invention. In FIG. 1, reference
`numeral 1 denotes a digital broadcasting receiving device
`(Integrated Receiver & Decoder:
`IRD), 2 a recording/
`playback device, 3 an encoder, 4 a digital broadcasting
`signal input terminal, 5 a tuner, 6 a QPSK demodulator, 7 a
`forward error correction (FEC) unit for correcting an error
`involved in the transmission of a signal, 8 a playback
`changeover switch, 9 a demultiplexer, 10 a MPEG decoder,
`11 an NTSC encoder, 12 an interface between the devices 1
`and 2, 13 a clock recovery unit, 14 a D/A converter, 15 a
`video output terminal, 16 an audio output terminal, 17 a
`recorded signal changeover switch, 18 a packet control
`circuit, 19 a recording/playback data processing, 20 a record
`amplifier, 21 a playback amplifier, 22 a magnetic tape, 23 a
`rotary head, 24 a clock generator, 25 a clock changeover
`switch, 26 a video input terminal, 27 an audio input terminal,
`28 a video A/D converter, 29 an audio A/D converter, 30 a
`video encoder, 31 an audio encoder, 32 a multiplexer, and 47
`a digital signal processor.
`FIG. 2 shows a composition of a transmitted digital
`broadcasting signal. As shown in a packet composition of
`FIG. 2(A), the transmission signal has a packet composition
`of 204 bytes; a 4-byte header 50; a 184-byte data 51
`representing information on a video, audio, added data, etc.,
`compressed in a compression system called, for example,
`MPEG 2 (Moving Picture Expert Group 2) as an interna-
`tional standard, and a 16-byte parity 52. The packets of those
`video, audio, added data, etc., are received in a multiplexing
`manner on a time divisional basis on a transmission line, as
`shown in FIG. 2(B). Generally, not only one program, but
`also a plurality of programs of video, audio and added data
`is multiplexed on a time divisional basis. The header com-
`position of FIG. 2(C) shows a content of the header 50. In
`FIG. 2(C), reference numeral 53 denotes a sync byte indica-
`tive of the head of the packet, 54 a transport error indicator,
`55 a payload unit start indicator, 56 a transport priority, 57
`
`LG Ex. 1006, pg 11
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`LG Ex. 1006, pg 11
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`

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`US 6,397,000 B1
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`3
`a PID indicative of attributes of the packet, 58 a transport
`scrambling control, 59 an adaptation field control, and 60
`continuity counter, each showing attributes and status of the
`packet, composed of 4 bytes in all. The numerals appearing
`on top of the packet each represent the number of bits of a
`respective subpacket.
`A digital broadcasting signal sent from a satellite is
`received at the digital broadcasting signal input terminal 4,
`and inputted to the tuner 5 which selects and outputs a
`desired signal. The output from the tuner 5 is demodulated
`by the QPSK demodulator 6 and then inputted to the FEC 7,
`which corrects an error involved in the received digital
`signal in the transmission. The output from the FEC 7 is
`delivered to the playback changeover switch 8 and the
`interface 12.
`
`is outputted from the
`When the broadcasting signal
`present device, the playback changeover switch 8 is set at a
`contact to input the output from the FEC 7 to demultiplexer
`9, which determines a type of a respective packet, using the
`PID 57, etc., of the header 50, separates only packets of a
`video, audio, etc., relating to a specified program, and then
`outputs these packets to the MPEG decoder 10. The multi-
`plexed signal contains a packet called, for example, a PCR
`(Program Clock Reference) indicative of time information
`representing the time when compression took place in a
`broadcasting station concerned. Thus, the clock recovery
`unit 13 reproduces a data clock 45 using this PCR. The
`decoder clock 45 reproduced by the clock recovery unit 13
`is controlled so as to have the same frequency as a clock
`used in a compressor (not shown) which compresses video
`and audio data information in accordance with the MPEG 2
`
`in the broadcasting station. The MPEG decoder 10 expands
`the respective video and audio signals compressed in accor-
`dance with the MPEG 2, etc., by using the received sepa-
`rating signal and the data clock 45 reproduced by the clock
`reproducing unit 13, and provides decoded video/audio
`signals. The video signal is converted by the NTSC encoder
`11 to a television analog video signal, which is then output
`from the video output
`terminal 15. The audio signal is
`converted by the D/A converter 14 to an analog audio signal,
`which is then outputted from the audio output terminal 16.
`When the received signal is recorded in the recording/
`playback device 2, the output from the FEC 7 is inputted to
`the interface 12, which separates packets of video and audio
`information and added information relating to a program to
`be recorded as in the demultiplexer 9. When the received
`signal
`is recorded and played back by the recording/
`playback device 2, it is required to also record and play back
`program information required for automatic selection of a
`broadcasting station. Thus,
`in addition to the packets
`selected by the demultiplexer 9, the interface 12 also selects
`a packet of program information relating to the program to
`be recorded and converts a part of the packet of program
`information. The signal separated by the interface 12 is
`inputted to the packet control circuit 18 by selecting a
`contact c by the recording signal changeover switch 17. As
`shown in the main data of FIG. 3A, the packet control circuit
`18 divides 188-byte packet data into 92-byte packet data A
`99 and 96-byte packet data B 100, and adds 4-byte packet
`header 98 to the packet dataA 99. The packet control circuit
`18 also produces in the packet header 98 a time stamp,
`shown in a hatched area 102, which is data on a time when
`the packet is received.
`As shown in FIG. 3A, additional information AUX 97 and
`a header 96 are further added by the recording/playback
`circuit 19 to each of the packet data A and B, in which the
`packet data A already has the added header 98, to thereby
`
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`4
`provide data blocks 90 and 91. The recording/playback
`circuit 19 further adds an error correction signal CIP 101, a
`sync signal 92 indicative of the head of the block, signals
`ID1 (93) and ID2 (94) representing information on the
`positions of the blocks, and a signal IDP 95 which represents
`an error check parity for the ID1 (93) and ID2 (94) are added
`to each of the blocks 90 and 91, and the resulting signals are
`recorded via the record amplifier 20 by the rotary head 23
`onto the magnetic tape 22. FIG. 4 shows a recording format
`on the magnetic tape 22 formed when the rotary head 23
`rotates through 180 degrees. Areas 70-76 are for a preamble,
`a subcode of additional information, a gap, main data having
`the block structure of FIG. 3A, a postamble, main data, and
`a parity C2P for error correction in main data 75, respec-
`tively. The subcode 71 has a pack composition called pack
`data, as shown in FIG. 3B.
`In reproduction, a signal 153 reproduced by the rotary
`head 23 is inputted via the playback amplifier 21 to the
`recording/playback data processing circuit 19, which detects
`the sync signal 92, signals ID1 (93), ID2 (94), etc., and
`corrects errors, using the CIP 101, C2P 76, etc., extracts
`packet dataA 99 and packet data B 100, and then sends those
`data to the packet control circuit 18. The packet control
`circuit 18 outputs the respective packets at the same inter-
`vals of time as in the recording in accordance with the time
`stamp 102 added when the data was recorded, and then
`sends those packets via the interface 12 to the playback
`changeover switch 8. When a reproduced picture is to be
`obtained, the playback changeover switch 8 is set at the
`contact b to thereby send a reproduced packet to the demul-
`tiplexer 9. The demultiplexer 9 automatically selects a
`broadcasting station on the basis of the packet of program
`information which was selected and converted by the inter-
`face 12 when the data was recorded, and outputs only a
`packet required for the MPEG decoder 10. Video/audio
`signals are obtained in a manner similar to that in which an
`output is obtained from a broadcasting signal.
`Also, in playback, the data clock 45 used in the MPEG
`decoder 10 is required to obtain the same frequency as it was
`compressed in the broadcasting station. To this end, at least
`the respective PCR time intervals inputted when recorded
`are required to be maintained, reproduced and outputted
`correctly. To this end, in recording, the time stamp 102 is
`added in the packet control circuit 18. In playback, the
`respective packets are outputted by the packet control circuit
`18 in accordance with the time stamps 102 to maintain the
`time intervals at which the packets are outputted. To this
`end, clocks used for producing the time stamp 102 in the
`recording should be decoder clock 45 reproduced by the
`clock recovery unit 13. In recording, the clock changeover
`switch 25 is set at a contact e so that the decoder clock 45
`
`is inputted to the packet control circuit 18.
`In reproduction, the clock recovery unit 13 of the digital
`broadcasting receiver 1 is operated by a timing signal
`outputted from the packet control circuit 18 to produce
`decoder clock 45. Thus, the packet control circuit 18 cannot
`use the decoder clock 45. In order to avoid-this, the clock
`generator 24 which generates a fixed clock 46 is provided so
`that when the clock changeover switch 25 is set at a contact
`f, the fixed clock 46 is inputted to the packet control circuit
`18 and a packet is outputted at a timing generated by the
`fixed clock 46. Thus, the clock recovery unit 13 is able to
`generate a stabilized clock depending on the fixed clock 46.
`The clock generator 24 generally uses a crystal oscillator. In
`this case, the frequency of the crystal oscillator should be
`within the standards of MPEG 2, etc.
`Recording/playback of an analog broadcasting such as a
`terrestrial broadcasting performed at present in the present
`recording/playback device will be described next.
`
`LG Ex. 1006, pg 12
`
`LG Ex. 1006, pg 12
`
`

`
`US 6,397,000 B1
`
`5
`is recorded, an
`When the analog broadcasting signal
`analog video signal 150 is inputted to the video input
`terminal 26 of the encoder 3 of FIG. 1. The video A/D
`converter 28 converts the analog video signal to a digital
`video signal. The video encoder 30 compresses the image,
`using the MPEG 2, etc., as in the compression of the digital
`broadcasting signal, and outputs the compressed signal to
`the multiplexer 32. An analog audio signal 151 is inputted to
`the audio input terminal 27, and converted by the audio A/D
`converter 29 to a digital audio signal. The audio encoder 31
`compresses the digital audio signal, and also outputs this
`signal to the multiplexer 32, which multiplexes a video
`stream 42 produced by the video encoder 30 and an audio
`stream 43 produced by the audio encoder 31.
`FIGS. 5A—5E show an example of timing in the multi-
`plexing operation. In FIGS. 5A—5E, VIs 1 (100) and 2 (111),
`etc., in the video stream 42 represent the respective video
`packets compressed by the video encoder 30. AUs 1 (113),
`2 (114), etc., in the audio stream 43 represent the respective
`audio packets compressed by the audio encoder 31. Refer-
`ence numeral 44 denotes a multiplexed stream obtained
`from the multiplexer 32 in which the length of each packet
`depends on a transfer rate which in turn depends on the
`compression rate. Generally,
`the transmission rate of the
`audio stream 43 is lower than that of the audio stream 42.
`
`As shown in FIGS. 5A—5E, the multiplexer 32 tempo-
`rarily stores the video and audio streams 42 and 43, and
`outputs them as the video and audio packet streams 45 and
`46 at
`the same transfer rate. The multiplexer 32 further
`outputs both the packets 45 and 46 in a time divisional
`manner onto a signal at a fixed transfer rate, which is
`generally higher than the sum of the transmission rates of the
`video and audio streams 42 and 43. It further produces a
`packet PAT 118, PMT 119, PCR 120, SI table 121, etc., on
`program information stipulated under the MPEG2 standards,
`and outputs then those data during a time when no video/
`audio are transmitted. A reference symbol PMT represents
`the PID of packets of video/audio which compose one
`program. A reference symbol PAT describes the PID of a
`packet of a PMT corresponding to each program. A refer-
`ence symbol SI represents information on a copy guard, a
`code indicative of each of discrete points in the recording,
`etc. The PAT and PMT used when a signal obtained by
`analog-to-digital conversion and compression of an analog
`broadcasting signal
`is recorded and reproduced may be
`stipulated uniquely as in the present invention or allocated to
`any one of the existing programs under the digital broad-
`casting.
`Reference symbols NULs 115, 125 and 126 denote sense-
`less dummy data whose quantities are each dependent on the
`difference between the total number of packets and the
`transmission rate of the multiplexed stream.
`As shown in FIGS. 5A—5E, the video stream 42, auido
`stream 43, other packets, and NULs are multiplexed on a
`time-divisional basis to form a single signal. The respective
`video packets VIs 1 (110), 2 (111), etc., on the video stream
`42 are the same in content as the VIs 1 (116), 2 (112) etc.,
`on the multiplexed stream 44. Similarly, the respective audio
`packets AUs 1 (113), 2 (114) etc., of the audio stream 43 are
`the same in content as the AUs 1 (122), 2 (124) etc., of the
`multiplexed stream 44.
`Thus, the multiplexed stream 44 has a stream composition
`similar to the output of the interface 12 of the digital
`broadcasting receiver 1. Thus,
`the recording signal
`changeover switch 17 selects a contact d and inputs the
`multiplexed stream 44 to the packet control circuit 18 to
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`thereby record/playback the multiplexed stream 44 in the
`same manner as the digital broadcasting signal.
`When the multiplexed stream 44 is recorded, the clock
`frequency used for producing the time stamp 102 in the
`packet control circuit 18 is required to have the same
`frequency as the clock used in the video and audio encoders
`30 and 31, as described with respect to the recording of the
`digital broadcasting. Thus, as shown in FIG. 1, the video
`encoder 30, audio encoder 31, and multiplexer 32 are
`operated at
`the fixed clock 46 generated by the clock
`generator 24, the clock changeover switch 25 is set at a
`contact f so that the fixed clock 46 is inputted to the packet
`control circuit 18. Also, in playback, the clock changeover
`switch 25 is set at the contact f while the packet control
`circuit 18 uses the fixed clock 46.
`
`When there is a margin in the transfer rate given to the
`recording/playback device, the digital and analog broadcast-
`ing signals are recordable simultaneously. FIG. 6 is a block
`diagram of a device for receiving, recording and playing
`back a digital broadcasting signal
`in this case, wherein
`reference numeral 2a denotes a recording/playback device.
`This device is different in operation from the FIG. 1 device
`in that the broadcasting stream which is the output from the
`interface 12 is also inputted to the multiplexer 32, and that
`the video encoder 30, audio encoder 31 and multiplexer 32
`are operated with the clock outputted from the clock
`changeover switch 25.
`In recording, as shown in FIGS. 7A—7D, the respective
`broadcasting (BR), video (VI), and audio (AU) packets of
`the broadcasting stream 41, video stream 42, and audio
`stream 43 are multiplexed on a time divisional basis and
`PMT and PCR are added to the multiplexed packets to
`constitute a multiplexed stream. In this case, the PAT is
`already contained in the broadcasting stream 41 (shown by
`a packet 130 of FIG. 7A), but only contains information on
`a program contained in the broadcasting stream. Thus, the
`information should be converted so as to include informa-
`
`In FIG. 7D, reference
`tion on the analog broadcasting.
`numeral 131 denotes a PAT converted by the multiplexer 32.
`In this case, the packet control circuit 18 uses the data
`clock 45 produced by the clock recovery unit 13. Thus, the
`clock changeover switch is set at a contact e, and the video
`and audio encoders 30 and 31 also use the decoder clock 45.
`
`the clock changeover switch 25 is set at a
`In playback,
`contact f to use the fixed clock 46.
`
`In playback, the user selects one of the digital and analog
`broadcasts,
`the demultiplexer 9 selects only one of the
`digital and analog broadcasts on the basis of the PAT
`converted in the recording, and inputs the selected program
`packet to the MPEG decoder 10 to obtain the video and
`audio of the desired program.
`Thus, the digital broadcasting signal and the digital signal
`to which the analog broadcasting signal is converted are
`easily recorded simultaneously in a multichannel. If the
`video and audio streams 42 and 43 alone are multiplexed in
`a mode in which no broadcasting stream 41 is outputted in
`the multiplexer 32 of the FIG. 6 device, an operational mode
`similar to that described in FIG. 1 is obtained. In this case,
`the clock changeover switch 25 is required to be set at the
`contact f in the recording operation. Alternatively, the video
`and audio signals may be selected from separate sources. For
`example, only the video signal may be selected from the
`broadcasting stream 41 and the audio signal may be selected
`from the audio stream 43. Conversely, only the audio signal
`may be selected from the broadcasting stream 41 and only
`the video signal may be selected from the audio stream 43.
`
`LG Ex. 1006, pg 13
`
`LG Ex. 1006, pg 13
`
`

`
`US 6,397,000 B1
`
`7
`While in the above the interface 12, multiplexer 32 and
`packet control circuit 18 are described as handling a one-
`way signal, these elements may be replaced with an input/
`output bus. FIG. 8 shows a signal line composition used in
`this case. Reference numerals 140, 143 and 144 each denote
`a tri(3)-state buffer whose output can have a high impedance
`and reference numerals 141 and 142 each denote an input
`buffer.
`
`In the arrangement of FIG. 8, when the digital broadcast-
`ing signal is recorded, the buffers 143 and 144 are each set
`at high impedance such that the digital broadcasting signal
`is inputted from the buffer 140 via the input buffer 142 to the
`packet control circuit 18. When the analog broadcasting
`signal is recorded, the buffers 140 and 143 are set at high
`impedance so that the analog broadcasting signal is inputted
`from the buffer 144 via the input buffer 142 to the packet
`control circuit 18. In playback, the buffers 140 and 144 are
`set at high impedance so that the signal of interest is inputted
`from the buffer 143 via the input buffer 141 to the interface
`12. This serves to reduce the number of signal lines between
`the interface 12 and the packet control circuit 18.
`The video A/D converter 28, audio A/D converter 29,
`video encoder 30, audio encoder 31 and multiplexer 32 may
`be built either in the recording/playback device 2 or in the
`digital broadcasting receiver 1. Although not shown,
`the
`demultiplexer 9, MPEG decoder 10, NTSC encoder 11, and
`D/A converter 14 may also be provided in the recording/
`playback device 2 as well. Thus, even the recording/
`playback device is capable of providing a reproduced video
`signal by itself. Of course, the digital broadcasting receiver
`1, recording/playback device 2 and encoder 3 may be all
`integrated in one unit.
`While in the above description the recording/playback of
`a digital signal alone has been described, the present device
`may have the function of recording/reproducing an analog
`signal as in a VHS and a VTR available at present.
`FIG. 9 is a block diagram of a receiving/recording/
`playback device which is capable of selecting, recording and
`reproducing one of the digital and analog signals. Like
`elements in FIGS. 1, 6 and 9 are identified by like reference
`numerals.
`
`In FIG. 9, reference numeral 2b denotes a recording/
`playback device, reference numeral 200 denotes an analog
`broadcasting signal input terminal, 201 an analog tuner, 202
`an analog audio recording/playback circuit, 203 an analog
`video recording/playback circuit, 204 an analog video
`record amplifier, 205 an analog video playback amplifier,
`206 a system controller, 207 an output selector, 208 an
`external audio output terminal, 209 an external video input
`terminal, 210 a digital recording changeover switch, 220 a
`video head, and 221 an audio head.
`When a digital signal is recorded in the device of FIG. 9,
`the digital recording changeover switch 210 is set at a
`contact i, so that the output from the digital signal processor
`47 is recorded via the playback amplifier 20 onto the
`magnetic tape 22 by the audio head 221 of the rotary head
`23. Simultaneously, a servo tracking signal is recorded by
`the system controller 206 in synchronism with the rotation
`of the rotary head 22. In this case, the output from the analog
`video record amplifier 204 is stopped by the system con-
`troller 206. In playback, a video signal 230 and an audio
`signal 231 are reproduced by the digital broadcasting
`receiver 1, and selected by the output selector 270 under the
`control of the system controller 206, and outputted from the
`external video and audio output terminals 209 and 208.
`When the analog broadcasting signal is digitally recorded,
`this signal is received at the analog broadcasting signal input
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`terminal 200, and inputted to the analog tuner 201 to
`produce analog video and audio signals 150 and 151 of a
`desired program, which are then inputted to the encoder 3.
`When the analog broadcasting signal is analog-recorded
`using a VHS system available at present, the analog broad-
`casting signal is similarly received at the analog broadcast-
`ing signal input terminal 200, and then inputted to the analog
`tuner 201 to produce analog video and audio signals 150 and
`151 of the desired program. The analog video signal 150 is
`processed by the analog video recording/playback circuit
`203 so as to be a signal, for example, conforming to VHS
`standards, which signal is then recorded via the analog video
`record amplifier 204 by the video head 220 of the rotary
`head 23. Simultaneously, the analog signal. 151 is produced
`by the analog audio recording/playback circuit 202 so as to
`be a signal, for example, conforming to the VHS standards,
`and then recorded via the digital recording changeover
`switch 210 set at a contact h and the record amplifier 20 by
`the audio head 221 of the rotary head 23. A servo tracking
`signal is recorded as in the digital recording. The video and
`audio hea