JPH07210989A - Signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a signal recording and reproducing device which is easy to obtain recording information of an arbitrary unit recorded in a recording medium. CONSTITUTION:A bit stream is inputted to a transmission packet ID detector 1 from an input terminal 20 as an input signal. when transmission signal kind information outputted from a transmission signal discriminator 13 is inputted to the transmission packet ID detector 1, the transmission packet ID detector 1 detects packet ID. Transmission packets stored in a transmission packet buffer 2 are inputted to a recording packet device 10 as a recording packet for each packet of fixed length, and a signal indicating that, from which transmission packet the recording packet is generated is inputted to a recording information multiplexer 17 as a recording packet and packet exchanging information. A signal indicating the number of bytes of the transmission packet is inputted to the recording information multiplexer 17 from the transmission signal discriminator 13 as transmission packet byte information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus for recording a video signal on a recording medium and reproducing the video signal from the recording medium.

[0002]

2. Description of the Related Art A conventional video signal recording / reproducing method using a signal recording / reproducing apparatus will be described below. FIG. 2 is a block diagram of a conventional signal recording / reproducing apparatus. In FIG. 2, 3
0 is a transmission packet buffer, 31 is a transmission packet ID detector, 4 is an error correction encoder, 5 is a recording / reproducing head,
6 is a magnetic tape, 7 is an error correction decoder, 15 is a modulator, 16 is a demodulator, 33 is a switch, 20 is an input terminal,
Reference numeral 23 represents an output terminal.

A bit stream is input from the input terminal 20 as an input signal. Bitstream has a fixed length of 7
It is input as a transmission packet to which a packet ID is added every 7 bytes. The transmission packet ID detector 31 detects the packet ID. The transmission packet buffer 30 accumulates the input signal until the transmission packet ID detector 31 detects the packet ID of each 77-byte transmission packet. Packet ID in transmission packet ID detector 31
After detecting, the output signal is sent to the transmission packet buffer 30, and data of every 77 bytes is transmitted from the transmission packet buffer 30 to the error correction encoder 4 as a recording packet.

The 77-byte data is added with an error correction code by the error correction encoder 4 and then modulated by the modulator 15 and recorded on the magnetic tape 6 by using the recording / reproducing head 5. At the time of reproduction, the data recorded on the magnetic tape 6 is demodulated by the demodulator 16 and subjected to error correction decoding by the error correction decoder 7 every 77 bytes, and then output from the output terminal 23.

[0005]

In the above conventional signal recording / reproducing apparatus, both the transmission packet and the recording packet are 77.
It is treated as having a byte data string. In this case, the relationship between the transmission packet and the recording packet is shown in FIG.
As shown in (a) and (b), 10 packets transmitted are recorded.
There is a one-to-one correspondence, as is the case with packets.

However, in reality, various types of transmission signals are being developed for practical use, and the fixed byte length of the transmission packet is 188 bytes and the fixed byte length of the recording packet is 77.
Bytes, and so on, may be different. In this case, the positional relationship of the bits in the packet of the transmission packet and the recording packet is as shown in FIGS. 5A and 5B, and it becomes difficult to grasp the positional relationship of the bits in the packet between both packets. As a result, it is possible to obtain information about the transmission packet, such as the header area in the transmission packet, the type of data included in the packet, the packet priority, or the packet encryption flag from a fixed position in the transmission packet. It will be difficult.

Further, it is difficult for the conventional signal recording / reproducing apparatus to know the start and end positions for each arbitrary frame unit or for each input signal when performing a search and an edit using the input signal.

Further, when recording an input signal after variable length coding in which the transmission amount per unit time changes, a stuff signal for recording rate adjustment is added to the input signal in order to keep the recording rate constant. Is essential, but it is difficult to separate the stuff signal and the original input signal for reproduction.

An object of the present invention is to solve the problems of the conventional signal recording / reproducing apparatus.

[0010]

According to a first aspect of the invention, transmission packet information for obtaining information on the bit length X by using a transmission packet for transmitting data having a predetermined bit length X (X is a positive integer) as an input signal. Obtaining means and (X × n) ≦ (Y ×
m) (m and n are positive integers) are satisfied, and every n transmission packets are converted into m recording packets having a data storage area of a predetermined bit length Y (Y is a positive integer). The signal recording / reproducing apparatus is composed of a transmission packet converting means and a recording means for recording the information about the bit length X together with the recording packet as additional information at a predetermined position on a recording medium.

A second aspect of the invention is a recording packet reproducing means for reproducing information on the bit length X of a transmission packet which is an input during recording together with the recording packet from a recording medium, and (X × n) ≦ (Y × m). ), Recording packet conversion means for converting m reproduced packets having a bit length Y into reproduced packets which are n data strings having the bit length X, and a packet output for outputting the reproduced packets. It is a signal recording / reproducing apparatus including the means.

A third aspect of the present invention is, when recording an input signal, a first stuff data for generating a first stuff data having a bit rate equal to a difference between an input bit rate of the input signal and a recording bit rate. Data generating means,
A signal composed of recording means for adding the first stuff data and first stuff data information indicating the position of the first stuff data on the recording medium to the input signal and recording the added stuff data on the recording medium. It is a recording / reproducing device.

Further, a fourth aspect of the present invention is an input signal recorded on a recording medium, first stuff data added to the input signal, and position information on the recording medium on which the first stuff data is recorded. Reproducing means for reproducing the first stuff data information from the recording medium;
The signal recording / reproducing apparatus is composed of signal output means for separating the reproduced signal into first stuff data and other data based on the stuff data information.

Further, a fifth aspect of the present invention uses an image signal as an input signal, detects a delimiter position of a screen group in units of one or a plurality of screens by the input signal, and determines a delimiter position for outputting delimiter information. Means, second stuff data generating means for generating second stuff data which is a signal to be added to the input signal so as to arrange the delimiter position at a predetermined position on the recording medium, and the second stuff data for the input signal. The signal recording / reproducing apparatus is composed of recording means for adding 2 stuff data and second stuff data information indicating the position of the second stuff data on the recording medium and recording the stuff data on the recording medium.

Further, a sixth aspect of the present invention is an input signal recorded on a recording medium, second stuff data added to the input signal, and position information on the recording medium on which the second stuff data is recorded. Reproducing means for reproducing the second staff data information from the recording medium,
The signal recording / reproducing apparatus is composed of signal output means for separating the reproduced signal into second stuff data and other data based on the stuff data information.

Further, a seventh aspect of the present invention uses an image signal as an input signal, and detects a delimiter position of a screen group in units of one or a plurality of screens by the input signal and judges a delimiter position for outputting delimiter information. And a delimiter information recording unit for recording the delimiter information at a predetermined position on the recording medium.

[0017]

In the first and second aspects of the invention, when recording the transmission signal, information such as the type of the transmission signal or the number of fixed length bytes of the transmission packet constituting the transmission signal is obtained, and the recording packet is recorded from the transmission packet. It is possible to maintain the positional relationship of the bits in the packets of the transmission packet and the recording packet by selecting the means for. As a result, it becomes easy to obtain the information of the header area in the transmission packet in which the information about the transmission packet is written or the information of the fixed position in the transmission packet by the recording packet.

Further, according to the third and fourth aspects of the invention, since the recording position on the recording medium of the stuff signal added to keep the recording rate constant during signal recording is known, the stuff signal and the original input are reproduced. It becomes easy to separate and reproduce the signal.

Further, in the fifth, sixth and seventh inventions, since the recording start and end positions on the recording medium can be known for each arbitrary frame unit or sequence, operations such as retrieval and editing are easy. Will be able to do.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of the first embodiment of the present invention. Hereafter, components with the same number have the same configuration and function. In FIG. 1, 1 is a transmission packet ID detector, 2 is a transmission packet buffer, 3
Is a transmission packet counter, 4 is an error correction encoder, 5 is a recording / reproducing head, 6 is a magnetic tape, 7 is an error correction decoder, 8 is a recording packet counter, 9 is a recording packet buffer, and 10 is a recording packetizer. , 11 is a recording packet decomposer, 12 is a recording packet ID detector, 13 is a transmission signal identifier, 14 is a recording packet determiner, 15 is a modulator, 1
6 is a demodulator, 17 is a recording information multiplexer, 33 is a switch, 20 and 21 are input terminals, and 22 is an output terminal.

As an input signal, a bit stream is input to the transmission packet ID detector 1 from the input terminal 20.
Also, input signal information is input from the input terminal 21. Here, as the input signal information, the bit length of each transmission packet when the bit stream is a packet which is a data string having a predetermined bit length is input.

First, the operation when a transmission packet having a fixed bit length of 77 bytes is input will be described. First, as the input signal information, information indicating that the bit length of the transmission packet is 77 bytes is input from the input terminal 21 to the transmission signal discriminator 13.

When the transmission signal type information output from the transmission signal discriminator 13 is input to the transmission packet ID detector 1,
The transmission packet ID detector 1 detects the packet ID added to each 77 bytes of the input bit stream. The value of the transmission packet counter 3 is incremented by 1 each time the packet ID is detected, and the transmission packet output from the transmission packet ID detector 1 is stored in the transmission packet buffer 2 until the next packet ID is detected.

The transmission packets stored in the transmission packet buffer 2 are input to the recording packetizer 10 as recording packets for each fixed length of 77 bytes. From the recording packetizer 10 to the recording information multiplexer 17, as a recording packet and packet conversion information, a signal indicating from which transmission packet the recording packet was generated is input.

A signal indicating the number of bytes of a transmission packet is input to the recording information multiplexer 17 from the transmission signal discriminator 13 as transmission packet byte information. A recording packet, packet conversion information, and transmission packet byte information are multiplexed from the recording information multiplexer 17, and the error correction encoder 4 is used.
Is output to the magnetic tape 6 and is added with an error correction code, then subjected to a predetermined modulation by the modulator 15 and recorded on the magnetic tape 6 by using the recording / reproducing head 5. At the time of recording, the data of the recording packet is recorded in the main recording area of the magnetic tape, and the packet conversion information and the transmission packet byte information are recorded in the auxiliary recording area.

Next, the operation during reproduction will be described. The recording packet recorded on the magnetic tape 6 is demodulated by the demodulator 16 and subjected to error correction decoding by the error correction decoder 7 for every 77 bytes, and then the recording packet ID detector 12 detects the ID of the recording packet. Is detected. This ID
When detected, the recording packet counter 8 stores recording packets one by one in the recording packet buffer 9.

The recording packet output from the error correction decoder 7 is input to the recording packet determiner 14 and the number of bytes of the transmission packet written in the auxiliary recording area in the recording packet is read. The recording packet determiner 14 outputs information indicating that the fixed-length byte of the transmission packet is in the 77-byte mode to the recording packet counter 8 and the recording packet disassembler 11.

Information indicating that the fixed-length byte of the transmission packet is 77 bytes is input to the recording packet counter 8. The recording packet counter 8 sends a control signal to the recording packet buffer 9 so that the recording packet is output to the recording packet decomposer 11 when one recording packet is stored in the recording packet buffer 9.
When the fixed length byte of the transmission packet is 77 bytes, the recording packet decomposer 11 does not decompose the input recording packet and outputs it as an output signal from the output terminal 23.

Next, the control when a transmission packet having a fixed bit length of 188 bytes is input from the input terminal 20 will be described. First, as the input signal information, information indicating that the bit length of the transmission packet is 188 bytes is input from the input terminal 21.

When the transmission signal type information output from the transmission signal discriminator 13 is input to the transmission packet ID detector 1,
The transmission packet ID detector 1 detects the packet ID added for every 188 bytes of the input transmission packet, and the transmission packet counter 3 stores the two transmission packets in the transmission packet buffer 2. That is, a total of 376 bytes (188 bytes x 2) of data is stored. Here, the two transmission packets are a transmission 0 packet and a transmission 1 packet, respectively. The 376-byte data is input to the recording packetizer 10. After input, the 376-byte data is separated into 5 data, and after adding 1 byte or 2 bytes of additional bits as shown in FIGS. 3 (a) and 3 (b), it is generated into a fixed-length 77-byte recording packet and recorded. Output to the information multiplexer 17. The recording packets generated here are referred to as recording 0 packet, recording 1 packet, recording 2 packet, recording 3 packet, and recording 4 packet.

Further, from the recording packetizer 10 to the recording information multiplexer 17, as a recording packet and packet conversion information, a signal indicating from which transmission packet the recording packet was generated is input.

Further, a signal indicating the number of bytes of a transmission packet of 188 bytes is input as the transmission packet byte information from the transmission signal discriminator 13 to the recording information multiplexer 17. The recording information multiplexer 17 multiplexes recording packets, packet conversion information, and transmission packet byte information, outputs the multiplexed information to the error correction encoder 4, adds an error correction code, and then performs a predetermined modulation by the modulator 15. After the recording, the recording / reproducing head 5 is used to record on the magnetic tape 6. At the time of recording, the data of the recording packet is recorded in the main recording area of the magnetic tape, and the packet conversion information and the transmission packet byte information are recorded in the auxiliary recording area.

Next, the operation during reproduction will be described. The recording packet recorded on the magnetic tape 6 is demodulated by the demodulator 16 and subjected to error correction decoding by the error correction decoder 7 every 77 bytes, and then the recording packet ID detector 12 detects the ID of the recording packet. Is detected. This I
The signal after D detection is stored in the recording packet buffer 9.

The recording packet output from the error correction decoder 7 is input to the recording packet determiner 14 and the mode information of the transmission packet written in the auxiliary recording area in the recording packet is read. The recording packet determiner 14
Recording packet counter 8 and recording packet decomposer 11
To the output information indicating that the fixed length byte of the transmission packet is 188 bytes.

When the recording packet counter 8 receives the mode information of the transmission packet, the recording packet counter 9 controls the recording packet decomposing unit 11 to output 5 packets when the recording packet buffer 9 stores 5 recording packets. Send a signal. The recording packet decomposing unit 11 rearranges the data in the order of two transmission packets from the data other than the additional byte of 1 or 2 bytes added at the time of creating each of the five recording packets, and outputs it from the output terminal 23.

When a transmission packet having a fixed bit length of 2048 bytes is input, information indicating that the transmission packet has a bit length of 2048 bytes is input as input signal information from the input terminal 21 and transmitted. The relationship between the packet and the recording packet is as shown in FIGS. That is, after adding 1 byte or 2 bytes of additional bits, 27 recording packets of 77 bytes are generated from one transmission packet of 2048 bytes.

As described above, according to the first embodiment,
By setting the positional relationship of the bits in the packet between the transmission packet and the recording packet, the header area in the transmission packet in which information about the transmission packet is written, or fixed position information in the transmission packet, for example, included in the packet Data type, packet priority,
It becomes easy to acquire the packet encryption flag and the like.

In the first embodiment, the recording packetizer 10 establishes the positional relationship between the transmission packets and the bits in the packets between the recording packets as shown in FIGS. 3 (a) and 3 (b). However, it is also possible for the recording packetizer 10 to have the positional relationship of the bits in the packet as shown in FIGS. That is, in FIG. 6, the data of the transmission 0 packet is recorded in a part of the recording 0 packet, the recording 1 packet, and the recording 4 packet, and the transmission 1 packet data is recorded in the recording 2 packet, the recording 3 packet, and the recording 4 packet. Data of the start position of the transmission 0 packet and the transmission 1 packet which are recorded in the remaining area after the recording of the transmission 0 packet of the packet are recorded at the start positions of the recording 0 packet and the recording 2 packet, respectively. By doing so, it becomes easier to acquire information on a fixed position in the transmission packet than in the case of FIG.

The second embodiment of the present invention will be described below. FIG. 8 shows a block diagram of the second embodiment of the present invention. In FIG. 8, 101 is a transmission packet ID detector, 102 is a transmission packet buffer, 103 is a recording rate adjuster, 104 is a stuff data adder, 4 is an error correction encoder, 5 is a recording / reproducing head, and 6 is a magnetic tape. , 7
Is an error correction decoder, 15 is a modulator, 16 is a demodulator, 1
Reference numeral 06 is a stuff data buffer, 107 is a stuff data information extractor, 108 is a stuff data separator, 1
Reference numeral 09 is a recorded information multiplexer, 110 is a stuff data generator, 33 is a switch, 20 and 24 are input terminals, and 23 is an output terminal.

As the input signal, the bit stream after variable length coding is inputted from the input terminal 20. The bit stream is input as a transmission packet to which a packet ID is added for each fixed length. Transmission packet ID detector 1
In 01, the packet ID is detected. The transmission packet buffer 102 accumulates the transmission packets until the transmission packet ID detector 101 detects the packet ID of the transmission packet, and outputs the accumulated transmission packets to the stuff data adder 104. Here, since the input signal is a bit stream after variable length coding, the number of transmission packets output to the stuff data adding unit 104 per unit time changes. Therefore, the recording rate is not constant but fluctuates.

Information indicating the transmission rate of the input signal is input from the input terminal 24 to the recording rate adjuster 103.
The recording rate adjuster 103 determines the amount of stuff data to be added in order to keep the fluctuating recording rate constant and the timing of adding the stuff data.
6 and the stuff data generator 110.

The stuff data generator 110 generates stuff data according to the amount of stuff data to be added and outputs it to the stuff data buffer 106. The stuff data buffer 106 outputs the stuff data to the stuff data adder 104 according to the amount and timing of the stuff data to be added.

The stuff data adder 104 adds the stuff data output from the stuff data buffer to the transmission packet output from the transmission packet buffer, and outputs the stuff data to the position information multiplexer 109. Further, the stuff data adder 104 outputs the position information of the position to which the stuff data is added to the position information multiplexer 109.

The position information multiplexer 109 multiplexes the position information of the position where the stuff data is added to the transmission packet where the stuff data is added, and the error correction encoder 4 performs error correction coding. After the error correction code, the data of the original transmission packet and the stuff data are subjected to predetermined modulation by the modulator 15 and recorded in the main recording area of the magnetic tape 6 as a recording packet. Further, the position information of the position to which the stuff data is added is recorded in the auxiliary recording area of the magnetic tape 6.

FIG. 11 is a conceptual diagram when stuff data is recorded on a magnetic tape. In FIG. 11, the addition start position of the stuff data is recorded in the area A in the auxiliary recording area. Further, in the area B, the addition end position of the stuff data is recorded. For example, the data of the transmission packet is 0.6 Mbit per 1/30 second, and the recording rate is 24 Mbps, that is, 0.
When recording 8 Mbit data on a magnetic tape,
0.2 Mbit per 1/30 second as staff data
Record.

At the time of reproduction, the data recorded on the magnetic tape 6 is subjected to error correction decoding by the error correction decoder 7. The data after error correction decoding is stuff data separator 108 and stuff data information extractor 107.
Entered in. The stuff data information extractor 107 also reads the position information of the stuff data recorded in the main recording area of the magnetic tape 6 from the auxiliary recording area of the magnetic tape 6 and inputs it to the stuff data separator 108.

The stuff data separator 108 separates the stuff data from the data after error correction decoding based on the position information of the stuff data input from the stuff data information extractor 107, and extracts the other signals, Output as output signal.

When recording an input signal after variable length coding in which the transmission amount per unit time changes, it is essential to add stuff data to the input signal in order to keep the recording rate constant. It is difficult for the above signal recording device to separate the stuff data and the original input signal for reproduction. On the other hand, in the second embodiment, when the stuff data is recorded on the recording medium, the recording position information of the stuff data on the recording medium is also recorded, so that the stuff data is separated at the time of reproduction. It becomes easy to take out other signals and output them as output signals.

The third embodiment of the present invention will be described below. FIG. 9 shows a block diagram in the third embodiment of the present invention. In FIG. 9, 111 is a transmission packet ID detector, 112 is a transmission packet buffer, 113 is an input data delimiter position determination device, 114 is a stuff data addition device,
4 is an error correction encoder, 5 is a recording / reproducing head, 6 is a magnetic tape, 7 is an error correction decoder, 15 is a modulator, 16 is a demodulator, 115 is a stuff data buffer, and 116 is a stuff data information extractor. 117 is a stuff data extractor, 118 is a recorded information multiplexer, 119 is a stuff data generator, 33 is a switch, 20 is an input terminal,
Reference numeral 23 represents an output terminal.

As an input signal, the bit stream after variable length coding is input from the input terminal 20. A packet ID is added to the bit stream for each fixed length. A GOP start code indicating a GOP start signal is added to the head packet of each GOP, and a GOP end code indicating a GOP end signal is added to the last packet of each GOP. Transmission packet ID detector 1
At 11, the packet ID is detected, and after detection, the transmission packet is input to the transmission packet buffer 112. The transmission packet buffer 112 accumulates the transmission packet until the transmission packet ID detector 111 detects the packet ID of the transmission packet, and outputs it to the stuff data adding unit 114.

In the transmission packet ID detector 112, the GO
When the transmission packet to which the P end code is added is detected, the code amount of the transmission packet until the detection is input to the input data delimiter position determiner 113. The input data delimiter position determiner 113 records a recordable code amount on one track which is a recording unit of the magnetic tape 6.
When the total code amount of the transmission packet up to the GOP end code is input, the input data delimiter position determiner 113 calculates the stuff data amount from the end end of the packet data to the end end of the track which is the recording unit of the magnetic tape. Then, it is input to the stuff data buffer 115 and the stuff data generator 119.

Here, the input data delimiter position determiner 11
In No. 3, the total code amount of transmission packets up to the GOP end code is recorded. However, if the total code amount does not match the recording rate at the time of recording, the stuff data amount including the difference amount is calculated, and the stuff data Input to the buffer 115 and the stuff data generator 119.

The stuff data generator 119 generates stuff data according to the amount of stuff data to be added,
Output to the stuff data buffer 115. The stuff data buffer 115 sends the stuff data of the stuff data amount calculated by the input data delimiter position determiner 113 to the stuff data adder 114. The stuff data adder 114 adds the stuff data output from the stuff data buffer 115 from the GOP final position of the data of the transmission packet output from the transmission packet buffer 112, and outputs the stuff data to the position information multiplexer 109. Further, the stuff data adder 114 outputs the position information of the position to which the stuff data is added to the position information multiplexer 118.

The position information multiplexer 118 multiplexes the position information of the position where the stuff data is added to the transmission packet where the stuff data is added, and the error correction encoder 4 performs error correction coding. After the error correction code, the data of the original transmission packet and the stuff data are subjected to a predetermined modulation by the modulator 15 and recorded as a recording packet in the main recording area of the magnetic tape 6. Further, the position information of the position to which the stuff data is added is recorded in the auxiliary recording area of the magnetic tape 6.

FIG. 12 is a conceptual diagram when stuff data is recorded on a magnetic tape. In FIG. 12, the addition start position of the stuff data is recorded in the area A in the auxiliary recording area.

At the time of reproduction, the data recorded on the magnetic tape 6 is demodulated by the demodulator 16 and the error correction decoder 7
By this, error correction decoding is performed. The data after error correction decoding is input to the stuff data extractor 117 and the stuff data information extractor 116. The stuff data information extractor 116 reads the position information of the stuff data recorded in the main recording area of the magnetic tape 6 from the auxiliary recording area of the magnetic tape 6 as well.
Input to the staff data extractor 117.

The stuff data extractor 117 outputs data other than the stuff data as an output signal based on the position information of the stuff data input from the stuff data information extractor 116 among the data after error correction decoding.

It is difficult for a conventional signal recording / reproducing apparatus to know the start and end positions for each arbitrary frame unit or sequence when performing a search or edit using the input signal. However, according to the third embodiment, since the delimiter positions for arbitrary plural frames on the recording medium are also recorded in the auxiliary recording area on the recording medium, it is possible to easily search and edit during reproduction. You can

Incidentally, in the second embodiment, as shown in FIG.
As shown in, the stuff data is added from the GOP final position to the end of the track, but the recording unit of 1 GOP is 1.
If it is 0 track, as shown in FIG.
Stuff data may be added so that the OP start position starts from a track that is a multiple of 10. In this case, the addition start position of the stuff data is recorded in the area A in the auxiliary recording area in FIG. Further, in the area B, the addition end position of the stuff data is recorded.

Further, in the second embodiment, the position information of the position to which the stuff data is added is recorded in the auxiliary recording area. However, the GOP start position, the GOP end position and the recorded GOP number are recorded. May be.

A fourth embodiment of the present invention will be described below with reference to the drawings. FIG. 10 shows a block diagram in the fourth embodiment of the present invention. In FIG. 10, 121 is a transmission packet ID detector, 122 is a transmission packet buffer,
Reference numeral 123 is an input data delimiter position determiner, 124 is a delimiter position information adder, 4 is an error correction encoder, 5 is a recording / reproducing head, 6 is a magnetic tape, 7 is an error correction decoder, and 15
Is a modulator, 16 is a demodulator, 125 is a delimiter position information extractor, 126 is a recording data extractor, 33 is a switch, 20 and 25 are input terminals, and 23 is an output terminal.

As an input signal, a bit stream after variable length coding is input from the input terminal 20. A packet ID is added to this bit stream for each fixed length. Further, a GOP start code indicating a GOP start signal is included in the head packet of each GOP, and a GOP indicating an GOP end signal is included in the last packet of each GOP.
The end code is added.

The transmission packet ID detector 121 detects the packet ID, and inputs the transmission packet to the transmission packet buffer 122 after the detection. Transmission packet buffer 12
2 accumulates the transmission packets until the transmission packet ID detector 121 detects the packet ID of the transmission packet, and outputs the accumulated transmission packets to the delimiter position information adding unit 124. Transmission packet I
When the D detector 122 detects a transmission packet to which the GOP end code is added, the input data delimiter position determiner 1
At 23, the position of the end of the GOP on one track, which is the recording unit of the magnetic tape 6, is calculated and output to the delimiter position information adder 124.

The delimiter position information adder 124 adds information on the position of the end end of the GOP on the track calculated by the input data delimiter position determiner 123 for recording in the auxiliary recording area of the magnetic tape 6 for error correction. Encoder 4
Output to. The data error-correction-coded by the error-correction encoder 4 is subjected to predetermined modulation by the modulator 15,
It is recorded as a recording packet in the main recording area of the magnetic tape 6. In addition, the position information of the end position of the GOP is recorded in the auxiliary recording area of the magnetic tape 6.

FIG. 14 is a conceptual diagram of the recording system on the magnetic tape. As shown in FIG. 14, information on the position of the end edge of the GOP is recorded in the area A of the auxiliary recording area on the magnetic tape.

At the time of reproduction, the data recorded on the magnetic tape 6 is demodulated by the demodulator 16 and then subjected to error correction decoding by the error correction decoder 7. The data after the error correction decoding is input to the delimiter position information extractor 125 and the recording data extractor 126. The delimiter position information extractor 125 reads the GOP end position information of the magnetic tape 6 from the auxiliary recording area of the magnetic tape 6 as well.

Here, when a search command in GOP units is input from the external input terminal 25, the error correction decoder 7 outputs the recording data based on the information extracted from the delimiter position information extractor 125. The data input to the container 126 is searched.

It is difficult for a conventional signal recording / reproducing apparatus to know the start and end positions for each arbitrary frame unit or sequence when performing a search and an edit using an input signal. However, as in the third embodiment,
According to the fourth embodiment, since the delimiter position for each arbitrary plurality of frames on the recording medium is also recorded in the auxiliary recording area on the recording medium, retrieval and editing can be easily performed during reproduction. .

[0070]

As described above, according to the first and second inventions, when recording a transmission signal, the type of the transmission signal or the fixed length byte of the transmission packet forming the transmission signal is input. By doing so, it is possible to maintain the positional relationship of the bits in the packets of the transmission packet and the recording packet, and as a result, the header area in the transmission packet in which information about the transmission packet is written, or the fixed position in the transmission packet It becomes easy to obtain the information in the recording packet.

Further, in the third and fourth inventions, since the recording position on the recording medium of the stuff signal added in order to keep the recording rate at the time of signal recording constant, the stuff signal and the original input can be inputted at the time of reproduction. It becomes easy to separate and reproduce the signal.

Further, in the fifth, sixth and seventh inventions, since the recording start and end positions on the recording medium can be known for each arbitrary frame unit or sequence, operations such as retrieval and editing can be performed. It will be easy to do.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of a conventional recording / reproducing apparatus.

FIG. 3 is a correlation diagram between a transmission packet and a recording packet according to the first embodiment.

FIG. 4 is a correlation diagram between a conventional transmission packet and a recording packet.

FIG. 5 is a correlation diagram between a conventional transmission packet and a recording packet.

FIG. 6 is a correlation diagram between a transmission packet and a recording packet according to the first embodiment.

FIG. 7 is a correlation diagram between a transmission packet and a recording packet according to the first embodiment.

FIG. 8 is a block diagram of a second embodiment of the present invention.

FIG. 9 is a block diagram of a third embodiment of the present invention.

FIG. 10 is a block diagram of a fourth embodiment of the present invention.

FIG. 11 is a track pattern diagram on the magnetic tape in the second embodiment of the present invention.

FIG. 12 is a track pattern diagram on a magnetic tape according to a third embodiment of the present invention.

FIG. 13 is a track pattern diagram on the magnetic tape according to the third embodiment of the present invention.

FIG. 14 is a track pattern diagram on a magnetic tape according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 transmission packet ID detector 3 transmission packet counter 10 recording packetizer 11 recording packet decomposer 12 recording packet ID detector 14 recording packet judging device 17 recording information multiplexer 101 transmission packet ID detector 102 transmission packet counter 103 recording rate Coordinator 104 Stuff data adder 106 Stuff data buffer 107 Stuff data information extractor 108 Stuff data extractor 109 Record information multiplexer 110 Stuff data generator 111 Transmission packet ID detector 112 Transmission packet counter 113 Input data delimiter position determiner 114 Stuff Data Adder 115 Stuff Data Buffer 116 Stuff Data Information Extractor 117 Stuff Data Extractor 118 Record Information Multiplexer 119 Star Shift data generator 121 transmission packet ID detector 122 transmission packet counter 123 input data delimiter position determiner 124 delimiter position information adder 125 delimiter position information extractor 126 recording data extractor

Claims (8)

[Claims] 1. A transmission packet information obtaining means for obtaining information on the bit length X by using a transmission packet for transmitting data of a predetermined bit length X (X is a positive integer) as an input signal.
The relationship of (X × n) ≦ (Y × m) (m and n are positive integers) is satisfied, and a predetermined bit length Y is set for each of the n transmission packets.
Transmission packet converting means for converting into m recording packets having a data storage area of (Y is a positive integer), and recording the recording packet together with the information on the bit length X as additional information at a predetermined position on the recording medium. A recording / reproducing apparatus, comprising: 2. A means for converting a transmission packet into a recording packet so that the head data position of the data string in the transmission packet coincides with the head data position of the data string in the recording packet. The described signal recording / reproducing apparatus. 3. A recording packet reproducing means for reproducing information on a bit length X of a transmission packet which is an input during recording together with the recording packet from a recording medium, and (X × n) ≦ (Y ×
m), the recording packet converting means for converting m reproduced packets having a bit length Y into reproduced packets that are n data strings having the bit length X, and a packet outputting the reproduced packet. A signal recording / reproducing apparatus comprising: an output unit. 4. When recording an input signal, first stuff data generating means for generating first stuff data, which is data having a bit rate equal to the difference between the input bit rate of the input signal and the recording bit rate, and Recording means for adding the first stuff data and first stuff data information indicating the position of the first stuff data on the recording medium to the input signal and recording the added stuff data on the recording medium. Signal recording / reproducing device. 5. A first stuff which is information on an input signal recorded on a recording medium, first stuff data added to the input signal, and position information on the recording medium on which the first stuff data is recorded. A reproducing means for reproducing the data information from the recording medium; and a signal outputting means for separating the reproduced signal into the first stuff data and the other data based on the first stuff data information and outputting the signal. Characteristic signal recording / reproducing device. 6. A delimiter position determination means for detecting a delimiter position of a screen group in units of one or a plurality of screens by the image signal as an input signal and outputting delimiter information, and the delimiter position. Second stuff data generating means for generating second stuff data which is a signal to be added to the input signal so as to be arranged at a predetermined position on the recording medium, and the second stuff data for the input signal, and A signal recording / reproducing apparatus comprising: a recording unit that adds second stuff data information indicating a position of the second stuff data on the recording medium and records the second stuff data on the recording medium. 7. A second stuff which is information on an input signal recorded on a recording medium, second stuff data added to the input signal, and position information on the recording medium on which the second stuff data is recorded. A reproducing means for reproducing data information from the recording medium; and a signal outputting means for separating the reproduced signal into second stuff data and other data based on the second stuff data information and outputting the separated stuff data. Characteristic signal recording / reproducing device. 8. A delimiter position determination means for detecting a delimiter position of a screen group in units of one or a plurality of screens by the image signal as an input signal and outputting the delimiter information, and the delimiter information. And a delimiter information recording means for recording the data at a predetermined position on the recording medium.