JP2001135024A - Image/audio signal recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record/reproduce digital image/audio signals by different multiplex systems in/from the same recording medium, and to output them from the same output terminal. SOLUTION: Analog image/audio signals from an input terminal 2 are processed by A/D conversion circuits 4, 5 and encode circuits 6, 7, and become a data stream of a PS form by a multiplex circuit 8, then are supplied to a switch circuit 9. Further, the data stream of a TS form of required program from the input terminal 25 is supplied to the switch circuit 9. The data stream selected by the switch circuit 9 is recorded in the recording medium 13. The reproduced signal of the recording medium 13 is supplied to a separation circuit 16, the form of the data stream is discriminated form header information, etc., the data stream is analyzed based on the discrimination result to separate the image signal, the audio signal and program information, and are processed by decode circuits 17-19 and D/A conversion circuits 21, 22 to be converted to an analog signal, then are supplied to a TV receiver (not shown in Figure) from the output terminal 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image / audio signal recording / reproducing apparatus for recording / reproducing image / audio signals of different forms.

[0002]

2. Description of the Related Art In recent years, digitalization of television broadcasting (TV broadcasting) has progressed, and with this, devices for recording and reproducing image signals and audio signals as digital data have become widespread. For example, systems such as a VTR using a magnetic tape as a recording medium and a DVD using an optical disk are typical. In these systems, a large amount of information such as image information and audio information is effectively compressed. Then, an efficiency coding technique is used.

A typical international standard for efficiency coding is M
PEG2 is known, and this MPEG2 is based on ISO
(International Organization for Standardization)
And IEC (International Electro Technical Commissi
on), standardization is performed, and ISO / IEC13
The standard is set as 818. In this standard, M
A data stream structure of an image signal as PEG2 video (ISO / IEC13818-2) and a data stream structure of an audio signal as MPEG2 audio (ISO / IEC13818-3) are defined, and these are multiplexed. As a system, an MPEG2 system (ISO / IEC13818-1) is defined.

[0004] In particular, in the MPEG2 system, different multiplexing systems are prepared for each data stream application, and program streams (hereinafter, PS) are mainly used for storage.
) And a transport stream (hereinafter, referred to as TS) mainly for broadcast / communication applications. While the PS has a time-division multiplexed data stream structure by dividing a single program (also called a program) into packets (hereinafter, the data stream having such a structure is referred to as a PS format data stream), the TS has a plurality of data streams. The data stream has a multi-program compatible data stream structure (hereinafter, a data stream having such a structure is referred to as a TS format data stream) in which a program is divided into packets in a relatively short size (188 bytes) and time division multiplexed.

[0005] In TV broadcasting by digital transmission, TS
In general, a plurality of programs are simultaneously transmitted per channel using a data stream of a format. On the other hand, a receiving device (receiver) including a separation circuit and a decoding circuit for a received TS format data stream is generally used. Decoder) has been developed. Also, an arbitrary program is selected and output from the received signal of the receiver decoder, and the selected program is recorded in the digital VTR in the form of a TS format packet as an input signal, and the reproduced output is returned to the receiver decoder, thereby selecting the selected program. There has been proposed a system that allows viewing of a program.

A method and apparatus for receiving such a digital signal is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 8-297919, which discloses a program of a plurality of channels which are bit-compressed and digitally transmitted, and the accompanying program. By selecting one program from a plurality of program guide information and generating and recording new guide information together with the program, a desired program recorded using this guide information can be reproduced. . In addition, by including date and time information in the program guide information, it is possible to limit the use of the program according to the elapsed time during reproduction.

FIG. 2 is a block diagram schematically showing a receiving system described in Japanese Patent Application Laid-Open No. Hei 8-297919 using an image / audio signal recording / reproducing apparatus.
Is a digital receiver, 101 is a receiver decoder, 1
02 is an analog receiving device, 103 is a recording / reproducing device, 10
Reference numeral 4 denotes a TV receiver. Here, as the recording / reproducing device 103, a VT using a magnetic tape as a recording medium is used.
R is used.

In FIG. 1, an image / audio signal subjected to bit compression, encryption, addition of an error correction code and the like by a transmitting station (not shown) is digitally transmitted and received by a digital receiving apparatus 100. The image / audio signal in this case forms a data stream in the above-described TS format, and is a signal obtained by time-division multiplexing a plurality of programs per channel and modulating a single carrier. Digital receiver 10
At 0, one channel is selected from a plurality of channels. In the receiver decoder 101, processing such as demodulation and error correction is performed on the selected channel, and a desired program specified from a plurality of programs on this channel is selected and decryption processing such as encryption decryption and bit expansion is performed. Is converted into a predetermined signal format together with the program information and supplied to the TV receiver 104.

When a recording command is issued, the receiver decoder 101 supplies the selected channel before or after decryption of the cipher as a data stream to the recording / reproducing device 103 in the form of a TS-format packet structure. Record on tape. The data stream reproduced from the magnetic tape is supplied to the receiver decoder 101, and when the reproduced data stream is encrypted, the data stream is decrypted and then decrypted as described above. Then, a designated desired program is extracted, subjected to decoding processing such as bit expansion, converted into a predetermined signal format together with program information, and supplied to the TV receiver 104.

In this way, the digital receiving device 10
0, a desired program among a plurality of programs in the channel received once is recorded by the recording / reproducing device 103, reproduced at an arbitrary time, and supplied to the TV receiver 104, so that the desired program can be reproduced at an arbitrary time. You can watch.

On the other hand, an image / audio signal transmitted in an analog manner is received by an analog receiving apparatus 102 and is transmitted to a TV receiver 10.
4 is supplied to the recording / reproducing device 103. When a recording command is issued, the recording / reproducing apparatus 103 performs a recording process on the image / audio signal and records the signal on a magnetic tape. The image / audio signal reproduced from the recording / reproducing device 103 is subjected to reproduction processing and supplied to the TV receiver 104.

Here, it is conceivable that an analog image signal and an audio signal received by the analog receiving apparatus 102 are digitally converted, bit-compressed, multiplexed, and recorded as a digital image / audio signal by the recording / reproducing apparatus 103. Can be In such a case, the received analog video and audio signals are for a single program,
The resulting data stream is in the PS format described above. In particular, when an optical disc such as a DVD is used as a recording medium, a data stream recorded on the optical disc is usually of the PS format, and the recording / reproducing device 103 transmits an image signal and an audio signal corresponding to the PS format. A multiplexing unit and a unit for separating an image signal and an audio signal from a data stream in the PS format are provided.

[0013]

By the way, according to the above-mentioned prior art, the first image / audio signal received by the analog receiving apparatus 102 and the second image / audio signal received by the digital receiving apparatus 100 are recorded and reproduced. Although it is possible to record on the same recording medium at 103, since the signal form of these image / audio signals is different, an output terminal is provided for each, and switching is performed according to the signal form of the reproduced image / audio signal.
It is necessary to output from the corresponding output terminal. That is, the reproduced signal from the recording medium is the first image /
If the signal is an audio signal, it is transmitted from one output terminal to T
It is necessary to switch to supply the signal to the V receiver 104. If the reproduction signal from the recording medium is the second image / audio signal, the signal is supplied to the receiver decoder 101 from the other output terminal. You need to switch.

The TV receiver 104 also has an input terminal for inputting a first image / audio signal supplied from the recording / reproducing device 103 and a second terminal from the receiver decoder 101.
Input terminal for inputting an image signal of the
And switching means for switching between these input terminals in accordance with the signal form of the image / audio signal reproduced in step (1).

A recording / reproducing apparatus 103 records and reproduces a first image / audio signal of a PS-format data stream which is received from the analog receiving apparatus 102, digitally converted, bit-compressed, and multiplexed. Even
The recording / reproducing apparatus 103 only has a separating means for the PS format image / audio signal, and can record the second image / audio signal supplied from the receiver decoder 101 as it is in the TS format data stream. However, the second image / audio signal reproduced from the recording / reproducing device 103 cannot be reproduced by reproducing it, separating it into an image signal and an audio signal as it is in a TS format data stream, and cannot be decoded. Could not be supplied directly to the TV receiver 104.

In the above-mentioned conventional technique, when the second image / audio signal from the receiver decoder 101 is recorded / reproduced by the recording / reproducing device 103, the second image / audio signal to be recorded / reproduced is received by the receiver decoder 101 There is no particular consideration of recording a data stream of one channel consisting of a plurality of programs, which is only one program selected in, and reproducing and extracting one program. .

The present invention has been made in view of such a point, and an object of the present invention is to convert an image / audio signal multiplexed in different signal formats (particularly, a TS format and a PS format data stream) into the same signal. It is an object of the present invention to provide an image / audio signal recording / reproducing apparatus which can record / reproduce on a recording medium and obtain a reproduction output from the same output terminal.

Another object of the present invention is to provide an image / image of a plurality of programs.
Provided is an image / audio signal recording / reproducing apparatus capable of recording and reproducing a data stream in which an audio signal is multiplexed in a TS format as it is, extracting a desired program from the reproduced data stream, and enabling viewing. It is in.

[0019]

In order to achieve the above object, the present invention comprises a compression means for bit-compressing an input analog video / audio signal and a means for multiplexing as an PS-format data stream, Obtained PS format data stream and TS by single program input from outside
The data stream of the format is switched so that the data stream can be recorded on the same recording medium. Further, an image signal and an audio signal are separated from the data stream reproduced from the recording medium, and further, in the case of a TS format data stream, a separating means for separating program information, and a playback output that can be viewed from these are obtained. Restoring means is provided. In particular, the program information restoring means restores the program information to an image signal. When reproducing a TS format data stream from a recording medium, the program information restoring means can be switched to the image / audio signal and output.

A demodulator for digitally transmitted TS format data stream and a program divider for extracting a desired program are provided so that a desired program can be viewed even when recording is not performed.

Further, in order to achieve the other objects,
According to the present invention, a TS-format data stream composed of a plurality of programs is recorded on a recording medium as it is, and a desired program is divided and extracted at the time of reproduction so that the program can be viewed.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below corresponds to the recording / reproducing device 103 in the system shown in FIG. 2, but is not limited to this.

FIG. 1 is a block diagram showing a first embodiment of an image / audio signal recording / reproducing apparatus according to the present invention, wherein 1 is an image / audio recording / reproducing apparatus of this embodiment, 2 is an analog input terminal, 3 is a demodulation circuit, 4 and 5 are A / D (analog / digital) conversion circuits, 6 and 7 are encoding circuits,
8 is a multiplexing circuit, 9 is a switching circuit, 10 is a recording signal processing circuit, 11 is a switching circuit, 12 is a recording / reproducing system, and 13 is a recording medium (here, an optical disk such as a DVD, but is not limited to this. No), 14 is a reproduction processing signal circuit, 15
Is a switching circuit, 16 is a separating circuit, 17, 18, and 19 are decoding circuits, 20 is a selection circuit, 21 and 22 are D / A (digital / analog) conversion circuits, 23 is a switching circuit, 24 is an output terminal, and 25 is an output terminal. Input terminal, 26 is output terminal, 27 is I / F
(Interface) circuit.

Referring to FIG.
The analog image / audio signal received at (FIG. 2) is supplied from an input terminal 2 to a demodulation circuit 3, where it is demodulated into an image signal and an audio signal. The image signal and the audio signal are supplied to the contact A of the switching circuit 23, and the switching circuit 23
When the image signal and the audio signal are closed, the image signal and the audio signal are supplied to the TV receiver 104 (FIG. 2) from the output terminal 24 as the viewable image / audio signal via the switching circuit 23.

The image signal demodulated by the demodulation circuit 3 is converted into a digital image signal by an A / D conversion circuit 4, and is bit-compressed by an encoding circuit 6 into the above-described data stream in the MPEG2 video format, and is then multiplexed by a multiplexing circuit. 8 is supplied.
The audio signal demodulated by the demodulation circuit 3 is also converted into a digital audio signal by the A / D conversion circuit 5 and is encoded by the encoding circuit 7 in an appropriate format (for example, the above-mentioned MPEG2 audio or MPEG1 standardized before this). Audio, linear CP
The data stream is bit-compressed into a data stream of a format such as M and supplied to the multiplexing circuit 8. In the multiplexing circuit 8, the bit-compressed digital image signal and digital audio signal are multiplexed into a data stream in the PS format and supplied to the contact C of the switching circuit 9. When recording the image / audio signal from the input terminal 2 in the recording / reproducing system 12 in such a data stream signal format, the switching circuit 9
Is closed on the contact C side, and the switching circuit 11 is closed on the contact E side. The PS format data stream output from the multiplexing circuit 8 is supplied to the recording signal processing circuit 10 via the switching circuit 9. , Recording medium (in this case, optical disk)
After signal processing is performed in a format corresponding to the recording format on 13, the signal is supplied to the recording / reproducing system 12 via the switching circuit 11 and recorded on the recording medium 13.

T from receiver decoder 101 (FIG. 2)
When recording an S-format data stream on the recording medium 13, the switching circuit 9 is closed on the contact D side, and the switching circuit 11 is closed on the contact E side. This data stream is shown in FIG.
As described above, the digital transmission image / audio signal received by the digital receiving apparatus 100 is supplied to the receiver decoder 101, where a desired program is extracted and converted into a TS format together with program guide information. ,
The data is input from the input terminal 25, supplied to the recording signal processing circuit 10 via the I / F circuit 27 and the switching circuit 9, and recorded in a format corresponding to the recording format of the recording medium 13 in the same manner as the PS format data stream. After the processing, the data is supplied to the recording / reproducing system 12 via the switching circuit 11 and is recorded on the recording medium 13.

When reproduction is performed by the recording / reproducing system 12,
The switching circuit 11 is switched to the contact F side. Recording medium 1
3 is supplied to the reproduction signal processing circuit 14 via the switching circuit 11, and the reproduction processing is performed.

When the reproduced signal is a PS-format data stream or a TS-format data stream, the image / audio signal recording / reproducing apparatus 1 outputs the reproduced signal directly to the TV receiver 104 (FIG. 2) for viewing. If so, the switching circuit 15 is closed to the contact H side, and the switching circuit 23 is switched to the contact B side. The state of the selection circuit 20 is set so as to select the output signal of the decoding circuit 18.

When the reproduction signal is a PS data stream, the data stream is supplied to a separation circuit 16 via a switching circuit 15, and is analyzed to separate it into a digital image signal and a sound signal. Is done. The separated image signal is supplied to a decoding circuit 18, subjected to a decoding process corresponding to the encoding process in the encoding circuit 6, bit-extended, and further selected.
Is supplied to the D / A conversion circuit 21 through
It is converted to an analog image signal. The audio signal separated by the separation circuit 16 is supplied to a decoding circuit 19, subjected to a decoding process corresponding to the encoding circuit 7, bit-extended, and further supplied to a D / A conversion circuit 22. Is converted to an analog audio signal. These analog image signals and audio signals are output from the output terminal 24 via the switching circuit 23 and supplied to the TV receiver 104 (FIG. 2). Thus, the PS recorded on the recording medium 13
You can watch the image / audio signal of the data stream in the format.

When the reproduction signal of the recording medium 13 is a TS format data stream and is directly output to the TV receiver 104, this data stream is supplied to the separation circuit 16 via the switching circuit 15 and analyzed. As a result, a digital image signal, an audio signal, and an additional information signal such as a program guide are separated. The separated image signal and audio signal have the same signal form as the image signal and audio signal separated from the PS format data stream, respectively, and the decoding circuit is similar to the PS format data stream. After bit expansion at 18, 19, D / A
The conversion circuits 21 and 22 convert the signals into analog image signals and audio signals. These analog image signals and audio signals are output from an output terminal 24 via a switching circuit 23 and output from a TV.
It is supplied to the receiver 104 (FIG. 2). In this way,
It is possible to view an image / audio signal of a TS format data stream recorded on the recording medium 13.

The additional information signal separated by the separation circuit 16 is decoded by a decoding circuit 17 to generate an information signal such as a program guide as a digital image signal of an appropriate format (hereinafter referred to as a program guide information signal). It is generated and supplied to the selection circuit 20. When the selection circuit 20 is set to select the output of the decoding circuit 17, the program guide information signal from the decoding circuit 17 is supplied to the D / A conversion circuit 21 via the selection circuit 20, and the analog program guide information is output. Converted to a signal. This analog program guide information signal is output from the output terminal 24 via the switching circuit 23 and supplied to the TV receiver 104 (FIG. 2). Thus, T
Additional information such as a program guide can be viewed on the V receiver 104.

When the TS format data stream reproduced from the recording medium 13 is supplied to the receiver decoder 101 (FIG. 2) in the TS format, the switching circuit 1
5 is switched to the contact G side. Accordingly, the TS-format data stream output from the reproduction signal processing circuit 14 is output from the output terminal 26 via the switching circuit 15 and the I / F circuit 27, and is supplied to the receiver decoder 101 (FIG. 2).

As described above, in the first embodiment, whether the signal recorded on the recording medium 13 is an image / audio signal received by the digital receiving device 100 (FIG. 2) or the analog receiving device 102 Regardless of the image / audio signal received at (FIG. 2), the TV receiver 104
The operation for enabling viewing in FIG. 2 is performed only on the image / audio recording / reproducing apparatus 1 side (that is, the switching circuit 15 converts the reproduction signal of the recording medium 13 to the image / audio recording / reproducing apparatus 1). 1 is supplied directly to the TV receiver 104, or is supplied from the image / audio recording / reproducing device 1 to the TV receiver 104 via the receiver decoder 101), or the TV receiver 104 ( In FIG. 2), although an input terminal for each is required, a means for switching between them is not required, so that the TV receiver 104 (FIG. 2) does not need to be aware of input switching.

Next, the data stream and its processing will be described.

FIG. 3 is an explanatory diagram of a TS format data stream and its processing. V1, V2, and V3 are image signals of programs 1, 2, and 3, and A1, A2, and A3 are programs 1 and 2.
A few audio signals, PG, are the additional information signals described above.

FIG. 3A shows the digital receiving apparatus 1 shown in FIG.
00 schematically shows a TS-format data stream of an image / audio signal received, where it is assumed that programs 1, 2, and 3 are multiplexed. Such a data stream has a structure in which TS (transport) packets of a fixed length of 188 bytes are time-division multiplexed. Then, as shown in FIG. 3B, each TS packet includes a 4-byte TS in a 184-byte payload TP.
(Transport) It has a structure to which a header TH is added, and the payload TP is a real data portion of a TS packet, in which an image signal, an audio signal, or an additional information signal of the programs 1, 2, 3 is added. Stored separately. Therefore, in FIG. 3A, TS shown as V1
The packet has a payload TP of an image signal of 184 bytes of the program 1, and the TS packet indicated by A1 has a payload of an audio signal of 184 bytes of the program 1 and a TS indicated by V2, V3, A2, A3, PG. The same applies to packets. Such a type determination of the TS packet is performed by using a 13-bit P packet included in the TS header TH.
This is performed using ID (Packet Identification) information, and it is possible to extract a desired program and a TS packet of an additional information signal from a plurality of programs in the data stream.

The data stream in the TS format shown in FIG. 3A is received by the digital receiving apparatus 100 and supplied to the receiver decoder 101 in FIG. (Here, program 1
3) is extracted from the PID of the TS header TH, and a TS format data stream composed of the TS packets V1 and A2 of the program 1 is formed as shown in FIG. 3C. The data stream in the TS format has a TS header TH added to each TS packet. In this case, the information on the extracted program 1 is extracted from the TS packet of the additional information signal in the received TS format data stream (FIG. 3A), and is extracted as shown in FIG. 3C. A TS packet MPG is added to the TS format data stream of Program 1. The data stream in the TS format shown in FIG. 3C is input from the input terminal 25 and recorded on the recording medium 13 in FIG.

In FIG. 1, when the data stream in the TS format shown in FIG. 3C is reproduced from the recording medium 13 and supplied to the separation circuit 16, the separation circuit 16 converts the data stream into the TS packet V1 from the data stream. Payload T
P is extracted and a data stream PES (Packetized Element) composed of encoded image data
ary stream) (in particular, V-PES), and from this data stream, a TS packet A
One payload TP is extracted and combined to form a data stream PES composed of encoded audio data (this is particularly called A-PES). The data stream V-PE of the image signal thus formed
S is supplied to the decoding circuit 18 and decoded, and the data stream A-PES of the audio signal is supplied to the decoding circuit 19 and decoded.

FIG. 4 shows P used in the embodiment shown in FIG.
FIG. 3 is a diagram for explaining an S format data stream.

FIG. 4A shows the structure of the data stream of the PS format formed by the multiplexing circuit 8 in FIG. 1, and shows the image of a single program (here, program 4). It has a structure in which a signal packet V4 and a voice signal packet A4 are time-division multiplexed. The packets V4 and A4 in this case are variable-length packets called PES packets, and a plurality of such PES packets constitute a pack. Each PES pack has a pack header PH as header information including time information and the like.
, And a system header SH which is multiplexed information is added to the first PES pack.

The PS format data stream having such a structure is supplied to the separation circuit 16 when reproduced from the recording medium 13 in FIG. In this separation circuit 16, each PES packet is extracted from this data stream,
These are combined into a PES, and further, as shown in FIG. 4B, PES packets of the image signal are extracted from this PES, and the data stream V of the image signal is combined.
-PES, and PES packets of the audio signal are extracted and combined to form a data stream A-PES of the audio signal.
And The data stream V- thus obtained
PES and A-PES are respectively a data stream V-PES of an image signal and a data stream A-PES of an audio signal from the data stream in the TS format shown in FIG.
And supplied to the decoding circuits 18 and 19 to be decoded.

The separation circuit 16 in FIG. 1 analyzes the data stream structure of the reproduction signal supplied from the switching circuit 15 irrespective of whether it is a TS format data stream or a PS format data stream. Type of header, ie, TS header TH or pack header P
H, and it is configured to be able to separate the program information of the image signal, the audio signal, and the additional information signal from the data stream supplied according to the identified header.

As described above, in the first embodiment,
A signal reproduced from the recording medium 13 is analyzed, and a separation circuit 16 for separating an image signal and an audio signal and, if necessary, program information is provided. When the program information is separated, the program information is decoded. By providing the decoding circuit 17,
Regardless of the multiplexing method of the image / audio signals recorded on the recording medium 13, a reproduction output that can be viewed from a single recording / reproduction device can be obtained.

FIG. 5 is a block diagram showing a second embodiment of the image / audio signal recording / reproducing apparatus according to the present invention, wherein 28 is a switching circuit, 29 is an input terminal, 30 is a demodulation circuit, and 31 is error correction. Circuit, 32 is an encryption / decryption circuit, 33 is a program division circuit, 34 is an operation unit, 35 is a control circuit,
Parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

The second embodiment also has the function of the receiver decoder 101 in FIG. 2. In FIG. 2, if the second embodiment corresponds to the recording / reproducing device 103, the digital receiving device The system configuration is such that the TS format data stream of the image / audio signal received at 100 is directly supplied to the recording / reproducing device 103. In the following description, it is assumed that the second embodiment is used for a system having such a configuration.

In FIG. 5, digital receiving apparatus 100
The data stream in TS format received in (FIG. 2)
Input from the input terminal 29. The input data stream is an image / audio signal to which bit compression and encryption have been added and an error correction code has been added, as described above, and which is demodulated by the demodulation circuit 30 and error corrected by the error correction circuit 31. After the processing is performed, it is supplied to the encryption / decryption circuit 32.

The operation section 34 allows a program request and program selection information to be bi-directionally communicated as necessary (or a distribution source) to permit decryption of the code, or the viewer inputs a program selection command. In response to this instruction, the control circuit 35 controls the encryption / decryption circuit 32 and the program division circuit 3
3 to generate control information.

The encryption / decryption circuit 32 decodes the encryption of the image / audio signal corrected by the error correction circuit 31 according to the control information from the control circuit 35. A TS-format data stream of image / audio signals of a plurality of programs whose codes have been decrypted is supplied to a program dividing circuit 33. The program dividing circuit 33 transmits a plurality of programs in accordance with control information from the control circuit 35. Of the desired program is divided and extracted,
It is output as a TS format data stream consisting of an image / audio signal of a single program. Also, the program dividing circuit 33
As described with reference to FIG. 3, the program information corresponding to the divided and extracted program is extracted from the additional information signal PG included in the input TS format data stream, and is reconstructed as a TS packet MPG. It is added to the TS format data stream consisting of the single image / audio signal.

The data stream of the TS format output from the program dividing circuit 33 is supplied to the contact D of the switching circuit 9 and the contact I of the switching circuit 28. Alternatively, when viewing the program while recording on the recording medium 13, the switching circuit 28 is set to a closed state on the contact I side, and the TS output from the program dividing circuit 33 is output.
The data stream in the format is supplied to the separation circuit 16 via the switching circuit 28. For the subsequent viewing,
This is the same as the reproduction process in the first embodiment shown in FIG. 1, and is supplied from the output terminal 24 to the TV receiver 104 (FIG. 2).

When recording the TS format data stream output from the program division circuit 33 on the recording medium 13, the switching circuit 9 is closed to the contact D side and the switching circuit 11 is closed to the contact E side. Thereby, similarly to the first embodiment shown in FIG. 1, this TS format data stream is recorded on the recording medium 13.

As described above, the data stream in the TS format output from the program dividing circuit 33 is recorded on the recording medium 13 and, similarly to the first embodiment shown in FIG. The analog image / audio signal received by the receiving apparatus 102 (FIG. 2) and input from the input terminal 2 is also recorded as a PS-format data stream, and the recording medium 13 on which the data stream is recorded is reproduced. The switching circuit 11 is on the contact F side, the switching circuit 28 is on the contact J side, and the switching circuit 23 is on the contact B side.
Switch to each side. Thereby, the reproduction signal of the recording medium 13 is supplied to the separation circuit 16 via the switching circuit 11, the reproduction signal processing circuit 14, and the switching circuit 28, and is processed in the same manner as in the first embodiment shown in FIG. , From the output terminal 24 to the TV receiver 104 (FIG. 2).

As described above, in the second embodiment,
An operation unit 34, a control circuit 35, a demodulation circuit 30, and an error correction circuit 3 are added to the configuration of the first embodiment shown in FIG.
1, an encryption / decryption circuit 32 and a program division circuit 33 are provided, and a digital image / audio signal and an analog image / audio signal inputted from outside are recorded on the same recording medium by appropriately switching signal input / output paths during recording and reproduction. Recording and reproduction, and even during reproduction, regardless of the form of the signal recorded on the recording medium 13, the signal can be output from the same output terminal. Becomes unnecessary.

FIG. 6 is a block diagram showing a third embodiment of the image / audio signal recording / reproducing apparatus according to the present invention. Reference numeral 36 denotes a switching circuit, which is the same as that shown in FIGS. The reference numerals are given and duplicate description is omitted.

In the second embodiment shown in FIG. 5, the received TS-format data stream is converted into a single-program TS-format data stream extracted from the plurality of programs and stored in a recording medium. It was for recording and playback,
In the third embodiment, the received TS format data stream is recorded on a recording medium while being composed of a plurality of programs, and is reproduced. At the time of reproduction, a desired program is separated and viewed. It is made possible.

In FIG. 6, similarly to the second embodiment shown in FIG. 5, a TS format data stream received by the digital receiving apparatus 100 (FIG. 2) and input from the input terminal 29 is demodulated by the demodulation circuit 30, After being processed by the error correction circuit 31 and the encryption / decryption circuit 32, it is supplied to the contact D of the switching circuit 9 and the contact K of the switching circuit 36. In this data stream, image / audio signals of a plurality of programs are time-division multiplexed.

This TS format data stream image /
When the user only listens to the audio or listens to the audio while recording on the recording medium 13, the switching circuit 28 is set to the contact I side, and the switching circuit 36 is set to the K side, respectively.
The TS format data stream output from the encryption / decryption circuit 32 is supplied to the program division circuit 33 via the switching circuit 36. As described above, the program division circuit 33 divides and extracts a desired program from among a plurality of programs in accordance with the control information from the control circuit 35, and generates a TS format composed of an image / audio signal of a single program. Output as a data stream. The TS-format data stream output from the program division circuit 33 is supplied to the separation circuit 16 via the switching circuit 28. The subsequent processing for viewing is the same as the reproduction processing in the embodiment shown in FIGS.
4 to the TV receiver 104 (FIG. 2).

When recording a TS format data stream from the input terminal 29 on the recording medium 13, the switching circuit 9
Is closed to the contact D side, and the switching circuit 11 is closed to the contact E side.
As a result, a TS format data stream in which image / audio signals of a plurality of programs output from the encryption / decryption circuit 32 are multiplexed is recorded on the recording medium 13.

As described above, the data stream in the TS format output from the encryption / decryption circuit 32 is recorded on the recording medium 13 and, similarly to the embodiment shown in FIGS. An analog image / audio signal received by the receiving apparatus 102 (FIG. 2) and input from the input terminal 2 is also recorded as a PS-format data stream. A plurality of programs are multiplexed from the recording medium 13. When reproducing the data stream in the TS format, the switching circuit 11 switches to the contact F side, the switching circuit 28 switches to the contact I side, the switching circuit 36 switches to the contact L side, and the switching circuit 23 switches to the contact B side. Thus, the TS data stream reproduced from the recording medium 13 is supplied to the program division circuit 33 via the switching circuit 11, the reproduction signal processing circuit 14, and the switching circuit 36. This program dividing circuit 33
Then, as described above, a desired program among a plurality of programs is divided and extracted according to the control information from the control circuit 35,
It is output as a TS format data stream consisting of an image / audio signal of a single program. The data stream of the TS format output from the program division circuit 33 is
8 to the separation circuit 16. The subsequent processing for viewing is the same as the reproduction processing in the embodiment shown in FIGS.
(FIG. 2).

When reproducing the PS format data stream from the recording medium 13, the switching circuit 11 is set to the contact F
The switching circuit 28 is switched to the contact J side, and the switching circuit 23 is switched to the contact B side. Thus, the data stream of the PS format reproduced from the recording medium 13 is switched to the switching circuit 1.
1, supplied to the separation circuit 16 via the reproduction signal processing circuit 14 and the switching circuit 28, processed in the same manner as in the embodiment shown in FIGS. 1 and 5, and output from the output terminal 24 to the TV receiver 104.
(FIG. 2).

As described above, in the third embodiment,
In addition to the effects provided by the second embodiment shown in FIG. 5, a TS data stream in which a plurality of programs are multiplexed is recorded on a recording medium as it is, and a desired program is extracted at the time of reproduction. Therefore, the desired program can be reproduced and viewed at any time at any time.

Although the embodiments of the present invention have been described above, the present invention is not limited to only such embodiments.
For example, the recording medium 13 is not limited to only an optical disk, but may be any recording medium such as a hard disk which satisfies a digital signal recording capacity.
It is equally applicable. In the above-described embodiment, the analog image / audio signal is recorded by receiving the analog transmitted signal, demodulating the signal, A / D converting the signal, and recording the signal. For example,
An analog image / audio signal from an output of a video camera or the like is used as an external input.
The signals may be supplied to the conversion circuits 4 and 5.

[0062]

As described above, according to the present invention,
Since different types of image / audio signals can be recorded on the same recording medium, and the reproduced image / audio signals are switched inside the apparatus even when the recording medium is reproduced, the reproduced image / audio signals are reproduced. Signals can be output from a single output terminal, eliminating the need to be aware of output switching during viewing.

Further, according to the present invention, a digital reception signal in a form in which a plurality of programs are multiplexed can be recorded as it is on a recording medium, and a desired program can be extracted and viewed during reproduction. It is possible to reproduce and view a desired program at the time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an image / audio signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram illustrating an example of a receiving system including a recording / reproducing device.

FIG. 3 is a schematic structure of a TS format data stream and FIG.
FIG. 4 is an explanatory diagram of processing of the data stream in the TS format in the first embodiment shown in FIG.

FIG. 4 is a schematic structure of a data stream in a PS format and FIG.
FIG. 3 is an explanatory diagram of processing of the PS format data stream in the first embodiment shown in FIG.

FIG. 5 is a block diagram showing a second embodiment of the image / audio signal recording / reproducing apparatus according to the present invention.

FIG. 6 is a block diagram showing a third embodiment of the image / audio signal recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image / audio signal recording / reproducing apparatus 2 Analog image / audio signal input terminal 3 Demodulation circuit 4, 5 A / D conversion circuit 6, 7 Encoding circuit 8 Multiplexing circuit 9 Switching circuit 10 Recording signal processing circuit 11 Switching circuit 12 Recording / reproduction system 13 Recording medium 14 Reproduction signal processing circuit 15 Switching circuit 16 Separation circuit 17-19 Decoding circuit 20 Selection circuit 21, 22 D / A conversion circuit 23 Switching circuit 24 Analog image / audio signal output terminal 25 Digital image / audio Signal input terminal 26 Digital image / audio signal output terminal 27 I / F circuit 28 Switching circuit 29 Digital image / audio signal input terminal 30 Demodulation circuit 31 Error correction circuit 32 Encryption / decryption circuit 33 Program division circuit 34 Operation unit 35 Control Circuit 36 Switching circuit 100 Digital receiver 101 Receiver decoder 102 A Analog receiver 103 Recording / reproducing device 104 Television receiver

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroo Okamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Digital Media Development Division, Hitachi, Ltd. 5C053 FA03 FA20 GB21 JA01 JA16 JA24 LA06 5D044 AB05 AB07 DE03 DE14 GK08 GK11 HL11 JJ06 JJ07

Claims (7)

[Claims] 1. Recording means for recording, on a recording medium, first digital data in which image data and audio data are multiplexed as a program stream, and reproducing means for reproducing the first digital data from the recording medium. Separating means for separating image data and audio data from the reproduced first digital data, and data expansion for decoding the separated image data and audio data to restore a viewable image / audio signal. Means for switching between the second digital data in which the data of a single program is multiplexed as a transport stream and the first digital data, and When the second digital data is reproduced from the recording medium by the reproducing means, The separating means separates image data, audio data and program information from the reproduced second digital data, and the data decompressing means decodes the separated image data and audio data, Decompression means for decoding the program information separated by the separation means and restoring it into a viewable image signal is provided, and the decoded program information is switched together with the image / audio signal restored by the data decompression means. An image / audio signal recording / reproducing device, which is output. 2. A data compression means according to claim 1, wherein said data compression means converts an input analog image / audio signal into digital data and compresses the data, and multiplexes said compressed digital data in a program stream format. And a multiplexing means for generating digital data. 3. The recording medium according to claim 1, further comprising interface means for inputting the second digital data and outputting the second digital data reproduced from the recording medium. An image / audio signal recording / reproducing apparatus, wherein the second digital data to be reproduced is switched and supplied to the separating means and the interface means. 4. An input means for inputting a transport stream in which image data and audio data of a plurality of programs transmitted as digital data are multiplexed, and demodulation for demodulating the digital data. Means for extracting image data and audio data of a desired program from the demodulated digital data and outputting the extracted digital data as the second digital data. An image / audio signal recording / reproducing apparatus characterized in that the data is switched to reproduction data of a recording medium and used as input data of the separation means. 5. Recording means for recording, on a recording medium, first digital data in which image data and audio data are multiplexed as a program stream, and reproducing means for reproducing the first digital data from the recording medium. Separating means for separating image data and audio data from the reproduced first digital data, and data expansion for decoding the separated image data and audio data to restore a viewable image / audio signal. Means for switching between second digital data in which data of a plurality of programs are multiplexed as a transport stream and the first digital data, and recording on the recording medium. First switching means for converting a signal into a signal; and a program for extracting image data and audio data of a desired program from the transport stream. Output means, the second digital data reproduced from the recording medium as input to the program extracting means, and the output of the program extracting means and the first digital data reproduced from the recording medium. An image / audio signal recording / reproducing apparatus provided with second switching means for switching to input to the separation means. 6. A data compression means for converting an input analog image / audio signal into digital data and compressing the data, and multiplexing the compressed digital data in a program stream format, wherein And a multiplexing means for generating digital data. 7. An input means for inputting a transport stream in which image data and audio data of a plurality of programs transmitted as digital data are multiplexed, and demodulating the digital data. An image / audio signal recording / reproducing apparatus, comprising: demodulation means for outputting the second digital data.