JPH07272343A - Digital information recording/reproducing system - Google Patents

Abstract

PURPOSE:To eficiently record/reproduce information by discriminating a mode signal indicating the transmission rate of a transmitted information signal and automatically discriminating a transmitted information signal transmited through a different route at a different transmission rate. CONSTITUTION:By means of a request signal 174 inputted to an interface circuit 11 from the system controller 83 of a receiving system via a transmission route 30, a digital information signal is read from a digital information signal source 1, encoded by a transmission system encoder 10 in a specified format, time- axially compressed to 1/n by a time axis compressing unit 20, a rate for a transmission rate is increased by n times, and the signal is modulated by a modulator 25 and sent to the transmission route 30. In a receiving system 200, a received signal is demodulated by a demodulator 35 and supplied to the recording system encoder 40 of a direct recording device 300. In the recording system encoder 40, the supplied signal is recorded and encoded in a format suitable for recording/reproducing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for digital information signals, and particularly to radio waves for satellite communication or CA or CA.
The present invention relates to a digital information recording / reproducing system and a recording / reproducing apparatus for recording / reproducing software selected by a user transmitted via a cable such as a TV.

[0002]

2. Description of the Related Art Conventionally, for example, the 4th journal of the Television Society.
Volume 7, No. 4 (1993), pages 494 to 497, transmit audio and video software, etc. through radio waves such as satellite broadcasting and cables such as CATV, and A system for recording and reproducing it has been considered.

[0003]

In the above prior art, the transmission rate differs depending on the transmission line used to transmit information from the transmission source to the user. For example, when a satellite line is used, the transmission rate is four times higher than when a telephone line is used.

Further, when image information is handled as an information signal, an image-compressed signal is generally transmitted, but even when they are transmitted at the same transmission rate, for example, two types of images, a standard image and a high-definition image, are transmitted. The compression rate may change even if a signal is transmitted or the same standard image is used. However, in the conventional recording / reproducing apparatus, no consideration was given to what kind of recording / reproducing speed at which signals having different transmission rates, various kinds of image modes, and signals having different compression rates should be recorded and reproduced.

The object of the present invention is to solve the above problems,
To provide a digital information recording / reproducing system and a recording / reproducing apparatus capable of automatically discriminating signals having different transmission rates, various kinds of image modes, and different compression rates, and recording / reproducing according to each mode. It is in.

[0006]

In order to achieve the above object, the present invention is configured as follows in a digital information recording / reproducing system.

(1) A transmission system that selects one transmission rate from a plurality of different transmission rates and transmits an information signal, and a reception system that receives the information signal transmitted from the transmission system, In a digital information recording / reproducing system comprising a recording / reproducing system for recording / reproducing a received signal received by the receiving system by using a head and a recording medium, the recording / reproducing system is transmitted from the transmitting system, A relative feed speed between the head and the recording medium is controlled by a transmission rate flag indicating a transmission rate or a mode.

(2) The head is composed of a rotary magnetic head, and the recording / reproducing system has the rotational speed of the rotary magnetic head proportional to the transmission rate of the information signal indicated by the transmission rate flag and the rotation speed of the rotary magnetic head. The received signal is recorded at the feeding speed of the recording medium.

(3) The receiving system or the recording / reproducing system includes a mode detecting means for detecting a transmission rate flag transmitted from the transmitting system, and the recording / reproducing system transmits the signal detected by the mode detecting means. Rotation speed control means for controlling the rotation speed of the rotary drum in proportion to the rate, and speed control means for controlling the feeding speed of the recording medium in proportion to the transmission rate detected by the mode detection means are provided.

(4) In the recording / reproducing system, when the predetermined first transmission rate is detected by the mode detecting means, the rotation speed control means rotates the rotary drum at a first rotation speed, The speed control means detects a first mode in which the recording medium is fed at a first feeding speed, and the mode detection means detects a transmission rate n times (n is a positive number) the first transmission rate. The rotation speed control means rotates the rotating drum at a second rotation speed n times the first rotation speed, and the speed control means operates at the second feed speed n times the first feed speed. And a second mode for sending the recording medium.

(5) A transmission system for transmitting an information signal to a plurality of transmission lines each having a different transmission rate, a reception system for receiving the information signal transmitted from the transmission system, and a reception received by the reception system. In a digital information recording / reproducing system including a recording / reproducing system for recording / reproducing a signal using a head and a recording medium, the receiving system has a selecting means for selecting one of the plurality of transmission paths, and the transmitting system has the A mode in which a flag input means for inputting a transmission path flag indicating a transmission path used for transmitting an information signal is provided, and the receiving system or the recording / reproducing system detects the transmission path flag input by the flag input means. The selecting means is provided with the detecting means, and the selecting means selects one of the plurality of transmission lines according to the detection result detected by the mode detecting means.

(6) The recording / reproducing system records the rotational speed control means for controlling the rotational speed of the rotary head according to the identification transmission rate corresponding to the transmission path flag detected by the mode detection means, and the recording according to the identification transmission rate. Speed control means for controlling a medium feed speed, and the transmission selected by the selecting means by using the rotation speed of the rotary head and the feed speed of the recording medium in proportion to the identification transmission rate of the information signal. Record the signal received on the road.

(7) A transmitting system for transmitting information signals of a plurality of different modes, a receiving system for receiving the information signal transmitted from the transmitting system, and a recording for recording and reproducing the received signal received by the receiving system. In a system consisting of a playback system,
The recording / reproducing system records mode information indicating a mode of the information signal transmitted from the transmitting system on a recording medium.

(8) The receiving system or the recording / reproducing system is provided with a flag receiving means for receiving a mode flag indicating the mode of the information signal output from the transmitting system, and the receiving system or the recording / reproducing system is the above-mentioned. A mode detecting means for detecting the mode flag received by the flag receiving means,
The recording / reproducing system generates a mode information according to a mode flag detected by the mode detecting means, a mode information generating means, at least the mode information generated by the mode information generating means, and a reception signal received by the receiving system. Recording processing means for recording the recording medium on the recording medium,
A received signal and mode information indicating a mode of the received signal are recorded on the recording medium.

(9) A transmission system for selecting one of a plurality of different modes and transmitting an information signal, and a reception system for receiving the information signal transmitted from the transmission system,
A recording / reproducing system for recording a received signal received by the receiving system and mode information indicating a mode of the information signal on a recording medium using a rotary magnetic head, and outputting a reproduced signal reproduced from the recording medium, and the recording / reproducing system. In a digital information recording / reproducing system including a decoding system for inputting a reproduction signal output from the system, the recording / reproducing system sends the feed speed of the recording medium and the reproduction signal to the decoding system according to the reproduced mode information. Controls the output transmission rate for output.

(10) The recording / reproducing system includes reproduction processing means for reproducing a recording signal recorded on the recording medium,
Storage means for storing the received signal reproduced by the reproduction processing means, reproduction mode detection means for detecting the mode information reproduced by the reproduction processing means, and the recording by the detection mode detected by the reproduction mode detection means Speed control means for controlling the feeding speed of the medium, and reproduction signal output means for outputting the reproduction reception signal stored in the storage means at an output transmission rate according to the detection mode detected by the reproduction mode detection means. A reproduction mode is provided according to the reproduced mode information.

(11) In the recording / reproducing system, when the reproduction mode detecting means detects the mode information of the first mode, the speed control means sends the recording medium at a first feeding speed to reproduce the reproduction signal. The output means outputs the reproduction reception signal at the first output transmission rate, and when the reproduction mode detecting means detects the mode information of the second mode different from the first mode, the speed control means outputs the first mode. The recording medium is fed at a second feeding speed different from the feeding speed, and the reproduction signal output means outputs the reproduction reception signal at a second output transmission rate different from the first output transmission rate.

(12) The recording / reproducing system includes mode output means for outputting the detection mode information detected by the reproduction mode detecting means, and the detection mode information indicating the reproduction reception signal and the mode of the reproduction reception signal. Is output to the decoding system.

(13) A transmitting system that selects one of a plurality of different modes to transmit an information signal, a receiving system that receives the information signal transmitted from the transmitting system, and a receiving system. A recording / reproducing system for recording the received signal received and the mode information indicating the mode of the information signal on a recording medium by using a rotary magnetic head and outputting a reproducing signal from the recording medium, and a reproducing signal outputted from the recording / reproducing system are inputted. In the digital information recording / reproducing system including a decoding system, the recording / reproducing system records mode information indicating a mode of the information signal transmitted from the transmitting system on a recording medium,
The mode information reproduced from the recording medium controls the feed speed of the recording medium and the output transmission rate for outputting the reproduction signal to the decoding system.

(14) The receiving system includes a flag receiving means for receiving a mode flag indicating the mode of the information signal output by the transmitting system, and the receiving system or the recording / reproducing system is the flag receiving means. The recording / reproducing system includes mode detection means for detecting the received mode flag, and the recording / reproducing system generates mode information according to the mode flag detected by the mode detection means, and at least the mode information generation means. Recording processing means for recording the recorded mode information and the received signal received by the receiving system on the recording medium, a reproduction processing means for reproducing the recording signal recorded on the recording medium, and the reproduction processing means. And a reproduction mode for detecting the mode information reproduced by the reproduction processing means. Output means, speed control means for controlling the feeding speed of the recording medium according to the detection mode detected by the reproduction mode detection means, and the reproduction reception signal stored in the storage means are detected by the reproduction mode detection means. And a reproduction signal output means for outputting at an output transmission rate according to the detection mode, the reception signal and mode information indicating the mode of the reception signal are recorded in the recording medium at the time of recording, and reproduced at the time of reproduction. The playback mode is set according to the mode information.

(15) In the recording / reproducing system, when the reproduction mode detecting means detects the mode information of the first mode during reproduction, the speed control means sends the recording medium at a first feeding speed, When the reproduction signal output means outputs the reproduction reception signal at the first output transmission rate and the reproduction mode detection means detects the mode information of the second mode different from the first mode, the speed control means The recording medium is fed at a second feed rate different from the first feed rate, and the reproduction signal output means is a second output rate different from the first output transmission rate.
The reproduced reception signal is output at the output transmission rate of.

(16) The recording / reproducing system includes mode output means for outputting the detection mode information detected by the reproduction mode detecting means during reproduction, and the detection signal indicating the reproduction reception signal and the mode of the reproduction reception signal. The mode information is output to the decoding system.

(17) The plurality of modes include at least a first mode and a second mode in which the amount of information per unit time is larger than that in the first mode.

(18) In the plurality of modes, the first
Is a standard image mode, and the second mode is a high definition image mode.

(19) The information signal is image data, and the image compression rate of the image data is different in different modes among the plurality of modes.

[0026]

The operation based on the above configuration will be described.

According to the present invention, the transmission rate flag can be inputted by the flag input means and the transmission rate of the information signal transmitted by the mode detection means can be judged, so that the detection can be performed by the control of the rotation speed control means and the speed control means. Since the recording medium can be fed by rotating the rotary drum at the number of rotations and the speed corresponding to the transmitted transmission rate, it is possible to record information signals transmitted at a plurality of types of transmission rates.

In particular, in the present invention, since the rotational speed of the rotary head and the feeding speed of the recording medium (magnetic tape) are controlled so that the speed is proportional to the transmission rate of the information signal transmitted / received and recorded, there are various possibilities. The recording information amount (information storage density) per unit tape length or unit track length of the information signal of the transmission rate can always be a substantially constant value (recordable maximum value) regardless of the transmission rate, and is always recorded. It is possible to efficiently record to the full recording capacity of the medium.

Further, since the flag receiving means receives the mode flag, the mode detecting means detects the mode of the information signal transmitted, and can be recorded as the mode information, this mode information is detected by the reproducing mode detecting means during reproduction. By controlling the speed control means and the reproduction signal output means, the recording medium can be sent at a speed corresponding to each mode, and the reproduction reception signal can be output at the output transmission rate corresponding to each mode. Can be recorded and reproduced.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a digital information recording / reproducing system according to the present invention. Figure 1
In, the system is roughly divided into a transmission system 100, a reception system 200, and a recording / reproducing device 300. Transmission system 10
0 mainly comprises a digital information signal source 1, an interface circuit 11 and a transmission system processing circuit 12, and the transmission system processing circuit 12 comprises a transmission system encoder 10, a time axis compressor 20 and a modulator 25. When transmitting image information, the transmission system encoder 10 performs image compression (compression of information amount). Also,
30 is a transmission line, 35 is a demodulator, 40 is a recording encoder, 4
5 is a changeover switch, 50 is a rotary drum, 51a, 51b
Is a magnetic head, 60 is a magnetic tape, 70 is a reproducing system decoder, 80 is a receiving system decoder, and 81 and 82 are servo circuits.
Of these, 81 is a drum control circuit, 82 is a tape control circuit, 83 is a system control, 85 is a mode detection circuit, and 9 is an output terminal. The magnetic heads 51a, 5
In 1b, (+) indicates positive azimuth and (−) indicates negative azimuth. As the transmission path 30, for example, 191 is a telephone line, 190 is a telephone line, a cable communication line such as a cable television or a satellite communication line.

In the figure, the operation of the transmission system 100 is as follows. A digital information signal is read from the digital information signal source 1 by a request signal 174 input to the interface circuit 11 from the system control 83 of the receiving system via the transmission path 30, and is encoded by the transmission system encoder 10 in a predetermined format. Then, it is time-axis compressed to 1 / n by the time-axis compressor 20 to increase the transmission rate n times, modulated by the modulator 25, and sent out to the transmission line 30.

In the receiving system 200, the signal received via the transmission line 30 is demodulated by the demodulator 35, and the demodulated signal remains encoded in the transmitting system encoder 10,
It is directly supplied to the recording system encoder 40 of the recording device 300.
The recording encoder 40 records and encodes the supplied signal in a format suitable for recording and reproduction.

FIG. 2 is a block diagram showing an example of the configuration of the recording encoder 40. Reference numeral 31 is an interface circuit, 41 is a storage circuit such as RAM, 43 is a parity generation circuit, and 44 is a recording signal generation circuit. , 305 are mode information generation circuits. In the figure, the demodulator 35 of the receiving system 200
The data 172 demodulated by is the interface circuit 3
1 is stored in the storage circuit 41 at a predetermined transmission rate. FIG. 3A shows this demodulated data. The parity generation circuit 43 generates the parity 303 from the demodulated data 302 stored in the storage circuit 41, and the parity circuit 303 is generated again.
Memorized in. In the recording signal generation circuit 44, the storage circuit 4
Demodulated data 302 and parity 303 stored in 1
Read out. In addition, prior to data transmission, the transmission system 10
The mode determination flag sent from 0 is identified (detected) by the mode detection circuit 85 as the mode determination flag (mode flag) 84. According to the detected mode flag 84, the mode information generation circuit 305 generates the ID signal 301 and the synchronization signal 300 including the mode information 403 including the recording flag. The ID signal 301 and the synchronization signal 300 are added to the demodulated data 302 and the parity 303 by the recording signal generation circuit, and the combined signal is converted into a block format signal as shown in FIG. 3B by the recording signal generation circuit 44. Is output. FIG. 4 is a configuration example of the ID signal 301. For example, a track number 401 for identifying a recording track, a block number 402 for identifying a position in the track, mode information 403, and an ID signal It is composed of a parity 404 for error detection and correction. Note that 410 and 411 are mode information 403.
The details will be described later.

The signal encoded by the recording system encoder 40 in this manner is supplied via the changeover switch 45 to the magnetic heads 51a and 51b attached to the rotary drum 50 at positions opposite to each other by 180 degrees, and the magnetic heads 51a and 51b are magnetized. Azimuth is recorded on the tape 60. FIG. 5 shows the track pattern at this time. The rotational speed of the rotary drum 50 and the running speed of the magnetic tape 60 are set to R (head rotational speed) and V (tape speed) by the control of the servo circuits 81 and 82, as in the conventional case, and P is a track pitch. Yes, W is the head width of the magnetic heads 51a and 51b. In this embodiment, the head width W is larger than the track pitch P and is set to 1.5 times, for example.

During reproduction, the rotary drum 50 is controlled at the same speed (rotation speed) as during recording by the control of the servo circuits 81 and 82.
The magnetic tape 60 is rotated at R, the magnetic tape 60 is run at a speed V / n of 1 / n at the time of recording, and the recorded signal is transferred to the magnetic head 51.
a, 51b. The reproduced signal is subjected to processing such as error correction using the parity 303 in the reproducing system decoder 70, and is sent to the receiving system decoder 80. For example, image decompression etc. is performed, and image data is output from the output terminal 9. Is output.

FIG. 6 is a diagram showing the track pattern at the time of this reproduction. The solid line shows the recorded track pattern, and the broken line shows the scanning loci of the magnetic heads 51a and 51b. In this way, the rotary drum 50 has the same speed R as that at the time of recording.
The magnetic tape 60 is rotated at a speed of 1 / n when recording V
/ N, so the magnetic heads 51a, 51b
The scanning pitch is 1 / n of the track pitch P, and although the scanning angle is slightly shifted, the scanning is performed n times per track. Of the n times of repetitive scanning, the reproduction signal of the scanning period which is the best for tracking is taken out. Further, if the rotational speed of the head is the same during recording and during reproduction, the relative speed between the head and the magnetic tape remains almost unchanged, so that the frequency band (transmission rate) during reproduction is substantially equal to that during recording. Therefore, it is necessary to reduce the transmission rate of the reproduction signal to almost 1 / n by the reproduction system decoder 70. The details will be described later. In addition, in FIG. 6, n is set to 3 in order to simplify the description. W indicates the head width of the magnetic heads 51a and 51b. Usually, this head width (W) is larger than the track pitch (P), and for example,
It is set to 1.5 times.

FIG. 7 shows the timing when the recording / reproducing apparatus 300 of FIG. 1 performs recording / reproducing.

When recording is started, the system control 83 transmits a request signal 174 for requesting predetermined software to the interface circuit 11 of the transmission system 100 via the transmission line 30.

As shown in FIG. 7, in the transmission system 100, the interface circuit 11 first transmits the mode signal 175 including the transmission rate flag 198 indicating the transmission rate of the transmission signal 172 to the recording device 300. In the recording apparatus 300, the mode detection circuit 85 detects the transmission rate, and the drum control circuit 81 sets the rotational speed of the rotary drum 50 to R and the tape control circuit 82 so that the recording operation corresponding to the predetermined transmission rate is performed. Thus, the detection transmission rate signal 84 is output so that the tape feeding speed becomes V. After the running of the rotary drum 50 and the magnetic tape 60 is stabilized, the transmission system 100 transmits the information signal and the recording device 300 starts the recording operation. In the figure, 197 is a recording preparation period. The figure shows a case where the signal having a transmission rate of 1 MHz, which is output from the transmission system encoder 10, is time-compressed to 1/6 by the time axis compressor 20 and transmitted as a signal having a transmission rate of 6 MHz. Therefore, the transmission signal 1
The transmission rate of 72 is 6 MHz. In the memory circuit 41 of the recording encoder 40, writing is performed at the frequency of 6 MHz indicated by the detected transmission rate signal 84. The time required for the above recording is T / 6.

In this embodiment, at the time of reproduction, the drum control circuit 81 sets the number of rotations of the rotary drum 50 to the same R as that at the time of recording, and the tape control circuit 82 sets the tape feed speed to 1 / the recording speed. It is set to V / 6 of 6, and the reproduction is performed by expanding the time T which is 6 times as large as that at the time of recording. This 6 times time extension processing is performed by the reproduction system decoder 70, as will be described later. The reproduction signal 192 is output to the reception system decoder 80 at a rate of 1 MHz. In the reception decoder 80, a decoding process including an image restoration process is performed corresponding to the image compression (information compression) process performed by the transmission encoder 10.

By the way, when a telephone line is used as the transmission line 30, due to band limitation, as shown in the above example,
It is transmitted at a transmission rate of 6 MHz, but when a satellite line or the like is used, the bandwidth is higher.
It can be a transmission rate of 4 MHz. FIG. 8 shows the recording / reproducing timing in this case.

The transmission system 100 has a transmission rate of 24 MHz.
Mode signal 175 including a flag 199 indicating that
When the mode detection circuit 85 detects this as the detection rate signal 84, the drum control circuit 81 controls the rotation speed of the rotary drum 50 to 4R according to the detection rate signal 84. Further, the tape control circuit 82 controls so that the tape feeding speed becomes 4V. The same amount of data as the transmission signal 172 of FIG. 7 can be recorded in a quarter of T / 24. Further, since the number of rotations of the rotary drum 50 and the feeding speed of the tape 60 are both quadrupled, the recording track pattern is the same as in the case of FIG. 7, and the head / tape relative speed at the time of recording is shown in FIG. 4 times more than At the time of reproduction, as in the case of FIG. 7, when the number of rotations of the rotary drum 50 is set to R and the feeding speed of the tape 60 is set to V / 6, the head / tape relative speed becomes approximately 1/4 of that at the time of recording, The transmission rate of the reproduction signal is approximately 6 MHz. The reproduction system decoder 70 converts the signal having the transmission rate of 6 MHz into 6
When the time is doubled, the transmission rate becomes 1/6 and 1
The reproduction signal 192 of MHz is output from the reproduction system decoder 70 to the reception system decoder 80.

FIG. 9 shows an addition of the input selection switch 36 to the system of FIG. 1, and the input of the switch 36 is satellite line 190a, wired line 190b such as cable TV, and telephone line 190c (191), respectively. ) To receive and record the transmission signals 172 from a plurality of input lines.

As in the embodiment of FIG. 1, when the system controller 83 of the receiving / recording system applies a predetermined software by the request signal 174, the transmitting system 100 uses the mode signal 175 to determine which signal line to use. Flag
It is transmitted together with a flag indicating the transmission rate. In the receiving system or the recording / reproducing system, this flag is detected by the mode detection circuit 85, and the switch 36 is switched according to the detection result, whereby the input signal from the predetermined signal line can be received and recorded. When the transmission rate is uniquely determined by the signal line, it is considered that the line flag (transmission flag) for identifying the line (transmission path) indicates the transmission rate, that is, also serves as the transmission rate flag. Therefore, it is not necessary to use the transmission rate flag in addition to the line flag, and communication using only the line flag is sufficient.

In the description of R indicating the rotation speed of the rotary drum 50 in FIGS. 1, 9 and 10, the value in parentheses is four times that of the standard transmission rate when the rotation speed is R. In particular, the number of revolutions at a transmission rate that is m times that is shown. Also, in the above description, two types of transmission rates have been described, but three or more types of transmission rates can be similarly handled.

As shown in the above description, by discriminating the mode signals to be transmitted, the transmission signals transmitted from different transmission lines and having different transmission rates are automatically discriminated and recorded. Is possible.

When image data is transmitted as an information signal, the mode of the transmission signal 172 may include not only the difference in transmission rate but also the difference in image mode of the digital information signal source 1. For example, it is a case of transmitting a high-definition image that requires a larger amount of information than the standard image. In this case, the mode signal 175 includes an image flag 120 (see FIG. 1) indicating whether the image is a standard image or a high definition image.
2) is transmitted and detected by the mode detection circuit 85, it is possible to detect and identify whether the recording apparatus 300 is a standard image or a high-definition image. The detection / identification result is obtained by the mode information generation circuit 305 included in the recording encoder 40, in the mode information 403 included in the ID signal 301 in the recording block signal, as shown in FIG.
The recording image flag 410 is inserted and recorded.

It is also conceivable that, even for the same standard image, the compression rate of image compression (compression of information amount) performed by the transmission system encoder 10 in the transmission system 100 is different.
For example, in the case of a mode in which this compression rate (information compression rate) is multiplied by k and the recording time is 1 / k, the compression flag 121 indicating the compression rate is used and the recording compression flag 411 shown in FIG.
As a result, the flag 411 is recorded in the mode information 403.

FIG. 10 is a block diagram of a recording / reproducing apparatus for recording / reproducing the tape 60 on which the recording image flag 410, the recording compression flag 411, etc. are recorded.
Reference numeral 71 is a reproduction mode detection circuit.

FIG. 11 is a block diagram showing an example of the structure of the reproducing system decoder 70, and 130 is a block reproducing circuit.
Reference numeral 131 is a storage circuit, 132 is an error correction circuit, and 133 is a reproduction signal output circuit. The signal 74 reproduced by the magnetic tape 60 is reproduced and demodulated by the block reproducing circuit 130, and the demodulated data 302 and the parity 303 are stored in the memory circuit 131.
To be remembered. Further, the ID signal 301 is sent to the reproduction mode detection circuit 71, and the image flag 410 and the compression flag 41 are sent.
1 etc. are detected. The signal stored in the memory circuit 131 is subjected to error correction processing by the error correction circuit 132 using the parity 303, and is stored again in the memory circuit 131. At the time of reproduction, since the tape feed speed is different from that at the time of recording, one track is scanned n times. Therefore, the actually effective signal is 1 / n of all signals stored in the memory circuit 131. Become. The value of n is judged by the detection signal 73 such as the image flag 410 and the compression flag 411,
For example, only a necessary signal is read from the memory circuit 131 to the reproduction signal output circuit 133 such as by extracting a reproduction signal in the scanning period in which tracking is best, and is output to the reception system decoder 80 as the reproduction signal 192 at a predetermined transmission rate. To do.
In this case, the read speed of the memory circuit 131 is approximately 1 / n times the write speed, which extends the time axis approximately n times and the transmission rate is reduced to approximately 1 / n.

The recording mode flag 410 is detected by the reproduction mode detection circuit 71, and if the image is a standard image, reproduction is carried out at the timing shown in FIG. 7, and the reproduction signal 192 is output at a transmission rate of 1 MHz with n = 6. . Further, for example, in the case of a high-definition image having twice the amount of information as the standard image, recording / reproduction is performed at the timing shown in FIG. The record is
Same as the standard image, but the rotary drum 50 during playback
Of the drum control circuit 8 so that the number of rotations of the tape is R and the feeding speed of the tape 60 is V / 3 which is twice as high as that of the standard image.
1. The tape control circuit 82 is operated. Furthermore, n = 3
As a result, the reproduction signal output circuit 133 is operated to output the reproduction signal 192 at the transmission rate of 2 MHz. Further, the detection signal 73 detected by the reproduction mode detection circuit 71 is output to the reception system decoder 80. The receiving system decoder 80 performs processing according to the image mode indicated by the input detection signal 73, and generates and outputs an image signal and the like.

Further, in the case of a mode in which the compression rate of image compression (information amount compression) at the time of standard image is increased and the amount of information is 1/2, recording is performed by the reproduction mode detection circuit 71 as shown in FIG. The compression flag 411 is detected, and the detection signal 73 is output to the reproduction system decoder 70, the drum control circuit 81, and the tape control circuit 82 so that the rotation speed of the rotary drum 50 is R and the feeding speed of the tape 60 is the standard image. , And the reproduction signal output circuit 133 is operated with n = 12 to output the reproduction signal 192 at a transmission rate of 0.5 MHz. In the receiver decoder 80, the input detection signal 73
Decompression processing corresponding to the image compression rate (information compression rate) shown in is performed, and an image signal or the like is generated and output.

As shown in the above description, flags according to different modes are added and recorded, the flags are judged at the time of reproduction, the feeding speed of the tape 60, and the reproduction signal output circuit 13
By controlling 3, it becomes possible to record a plurality of information signals of different modes and reproduce them while automatically discriminating the modes.

In the above description, the case where the image compression rate (information compression rate) is 2 times or 1/2 times is taken as an example.
In general, even when a is a positive number and a times, it is possible to obtain the same effect by setting the compression flag corresponding to each and performing the same operation.

Although the mode detecting circuit 84 is provided in the recording / reproducing apparatus 300, it may be provided in the receiving system 200.
The receiving system 200 includes a demodulator 35, a switch 36,
The receiving system decoder 80 includes a receiving system decoder 80, and the receiving system 200 includes a demodulator 35 and a switch 36.
May be configured as an independent system as a decoding system.

In a certain mode, when the tape speed during reproduction is 1 / n of the tape speed during recording, the rotation speed of the rotary head is the same as the rotation speed during recording. However, it is generally difficult to design a control system in which the rotational speed of the rotary head is 1 / n. On the other hand, it is easy to design, as in the above embodiment, to make the rotational speed of the rotary head the same during recording and reproduction.

[0058]

As described above in detail, according to the present invention, audio and video software and the like are communicated via radio waves such as satellite communication or a cable such as CATV and recorded in a recording device such as video. , In a digital information recording / reproducing system for selling or renting, a transmission information signal transmitted at a different transmission rate from a different transmission line is automatically detected by determining a mode signal indicating the transmission rate of the transmitted information signal. Information, it is possible to record the information signal at a recording / reproducing speed proportional to the transmission rate. As a result, the information signal having any transmission rate can be efficiently recorded / reproduced on the limited amount of recording medium at the maximum recording density. Also, by adding and recording flags according to different modes, and by judging this flag at the time of reproduction, information signals of a plurality of different modes are recorded, and while automatically distinguishing the modes,
It is possible to obtain effects such as being able to reproduce.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital information recording / reproducing system according to the present invention.

FIG. 2 is a block diagram showing a configuration example of a recording encoder according to the present invention.

FIG. 3 is a diagram showing input / output signals of the recording encoder shown in FIG.

FIG. 4 is a diagram showing a configuration example of an ID signal.

5 is a diagram showing a track pattern at the time of recording in the embodiment of FIG.

FIG. 6 is a diagram showing a track pattern during reproduction in the embodiment of FIG.

FIG. 7 is a timing chart showing recording / reproducing timing at a low transmission rate in the embodiment of FIG.

8 is a timing chart showing recording / reproducing timing at a high transmission rate in the embodiment of FIG.

FIG. 9 is a block diagram showing another embodiment of the digital information recording system according to the present invention.

FIG. 10 is a block diagram showing another embodiment of the digital information recording system according to the present invention.

11 is a block diagram showing a configuration example of a reproducing system decoder according to the embodiment of FIG.

FIG. 12 is a timing chart showing the recording / reproducing timing of the embodiment of FIG.

13 is a timing chart showing recording / reproducing timing of the embodiment of FIG.

[Explanation of symbols]

 10 transmission system encoder 11 interface circuit 20 time axis compressor 25 modulator 31 interface circuit 35 demodulator 36 switch 40 recording system encoder 41 storage circuit 43 parity generation circuit 44 recording signal generation circuit 50 rotating drum 51a, 51b magnetic head 60 Magnetic tape 70 Playback system decoder 71 Playback mode detection circuit 80 Reception system decoder 81 Drum control circuit 82 Tape control circuit 83 System control 84 Detection rate signal 85 Mode detection circuit 120 Image flag 121 Compression flag 130 Block playback circuit 131 Storage circuit 132 Error correction circuit 133 Reproduction signal output circuit 170 Stabilization detection signal 171 Recording permission signal 172 Transmission signal 175 Mode signal 305 Mode information generation circuit 403 Mode information 410 Recorded image flag 4 11 Recording compression flag

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Claims (19)

[Claims] 1. One of a plurality of different types of transmission rates
A transmission system for selecting an appropriate transmission rate to transmit an information signal, a reception system for receiving the information signal transmitted from the transmission system, and a reception signal received by the reception system using a head and a recording medium. In the digital information recording / reproducing system, which comprises a recording / reproducing system for recording / reproducing, the recording / reproducing system is transmitted from the transmitting system, and the head and the recording are recorded by a transmission rate flag indicating a transmission rate or mode of the information signal. A digital information recording / reproducing system characterized by controlling relative feed speed between media. 2. The head comprises a rotary magnetic head, and the recording / reproducing system records the number of revolutions of the rotary magnetic head proportional to the transmission rate of the information signal indicated by the transmission rate flag and the recording. At the media feed rate,
The digital information recording / reproducing system according to claim 1, wherein the received signal is recorded. 3. The receiving system or the recording / reproducing system includes a mode detecting unit for detecting a transmission rate flag transmitted from the transmitting system, and the recording / reproducing system includes a transmission rate detected by the mode detecting unit. Rotation speed control means for controlling the rotation speed of the rotary drum in proportion to the speed, and speed control means for controlling the feeding speed of the recording medium in proportion to the transmission rate detected by the mode detection means. 3. The digital information recording / reproducing system according to claim 1 or 2. 4. The recording / reproducing system, when the predetermined first transmission rate is detected by the mode detecting means, the rotation speed control means rotates the rotary drum at a first rotation speed, The control means has a first mode in which the recording medium is fed at a first feed speed, and the mode detection means provides a first mode.
When a transmission rate n times the transmission rate (n is a positive number) is detected, the rotation speed control means rotates the rotary drum at a second rotation speed n times the first rotation speed, 4. The digital information recording / reproducing system according to claim 3, wherein the speed control means has a second mode in which the recording medium is fed at a second feeding speed which is n times the first feeding speed. 5. A transmission system for transmitting an information signal to a plurality of transmission lines each having a different transmission rate, a reception system for receiving the information signal transmitted from the transmission system, and a reception signal received by the reception system. In a digital information recording / reproducing system including a recording / reproducing system for recording / reproducing using a head and a recording medium, wherein the receiving system is a selecting means for selecting one of a plurality of transmission paths, and the transmitting system is the information signal. A flag input means for inputting a transmission path flag indicating a transmission path to be used for transmitting, and the receiving system or the recording / reproducing system detects the transmission path flag input by the flag input means. Wherein the selection means selects one of the plurality of transmission paths according to the detection result detected by the mode detection means. Raw system. 6. The recording / reproducing system comprises a rotation speed control means for controlling the rotation speed of the rotary head according to an identification transmission rate corresponding to the transmission path flag detected by the mode detection means, and a recording medium according to the identification transmission rate. And a speed control means for controlling the feed speed of the recording medium, the transmission path selected by the selecting means using the rotation speed of the rotary head and the feed speed of the recording medium in proportion to the identification transmission rate of the information signal. 6. The digital information recording / reproducing system according to claim 5, wherein the received signal is recorded. 7. A transmission system for transmitting information signals of a plurality of different modes, a reception system for receiving the information signal transmitted from the transmission system, and a recording / reproduction for recording / reproducing the reception signal received by the reception system. The digital information recording / reproducing system according to claim 1, wherein the recording / reproducing system records mode information indicating a mode of the information signal transmitted from the transmitting system on a recording medium. 8. The receiving system or the recording / reproducing system includes flag receiving means for receiving a mode flag indicating a mode of the information signal output from the transmitting system, and the receiving system or the recording / reproducing system includes the flag. Mode recording means for detecting the mode flag received by receiving means, wherein the recording / reproducing system generates mode information according to the mode flag detected by the mode detecting means, and at least the mode information generating means. Recording processing means for recording the mode information generated by the means and the received signal received by the receiving system on the recording medium,
8. The digital information recording / reproducing system according to claim 7, wherein a received signal and mode information indicating a mode of the received signal are recorded on the recording medium. 9. A transmission system that selects one of a plurality of different modes to transmit an information signal, a reception system that receives the information signal transmitted from the transmission system, and a reception system that receives the information signal. The received signal and the mode information indicating the mode of the information signal are recorded on a recording medium using a rotary magnetic head, and a recording / reproducing system for outputting a reproduced signal reproduced from the recording medium and a recording / reproducing system. In a digital information recording / reproducing system including a decoding system for inputting a reproducing signal, the recording / reproducing system outputs the reproduction signal to the decoding system and the feed speed of the recording medium according to the reproduced mode information. A digital information recording / reproducing system characterized by controlling the. 10. The recording / reproducing system, reproduction processing means for reproducing a recording signal recorded on the recording medium, storage means for storing a reception signal reproduced by the reproduction processing means, and the reproduction processing means. Reproduction mode detecting means for detecting the mode information reproduced by the recording medium, speed control means for controlling the feeding speed of the recording medium according to the detection mode detected by the reproduction mode detecting means, and reproduction reception stored in the storage means. 7. A reproduction signal output means for outputting a signal at an output transmission rate according to the detection mode detected by the reproduction mode detection means, and a reproduction mode according to the reproduced mode information. 9. A digital information recording / reproducing system according to item 9. 11. The recording / reproducing system, when the reproduction mode detecting means detects the mode information of the first mode, the speed control means sends the recording medium at a first feeding speed to output the reproduction signal. Means outputs the reproduction reception signal at a first output transmission rate, and when the reproduction mode detecting means detects mode information of a second mode different from the first mode, the speed control means makes a first feed. The recording medium is sent at a second feed speed different from the speed, and the reproduction signal output means outputs the reproduction reception signal at a second output transmission rate different from the first output transmission rate. 10. A digital information recording / reproducing system according to item 10. 12. The recording / reproducing system includes a mode output means for outputting the detection mode information detected by the reproduction mode detecting means, and outputs the reproduction reception signal and the detection mode information indicating the mode of the reproduction reception signal. The digital information recording / reproducing system according to claim 10 or 11, wherein the digital information recording / reproducing system outputs the information to the decoding system. 13. A transmission system that selects one of a plurality of different modes to transmit an information signal, a reception system that receives the information signal transmitted from the transmission system, and a reception system that receives the information signal. A recording / reproducing system for recording the received signal and the mode information indicating the mode of the information signal on a recording medium by using a rotary magnetic head and outputting a reproducing signal from the recording medium, and a reproducing signal output from the recording / reproducing system are input. In a digital information recording / reproducing system including a decoding system, the recording / reproducing system records mode information indicating a mode of an information signal transmitted from the transmitting system on a recording medium, and the mode information reproduced from the recording medium. The digital information recording / reproducing system is characterized by controlling the feeding speed of the recording medium and the output transmission rate for outputting the reproduced signal to the decoding system. Beam. 14. The receiving system comprises a flag receiving means for receiving a mode flag indicating a mode of the information signal output by the transmitting system, and the receiving system or the recording / reproducing system is received by the flag receiving means. The recording / reproducing system includes a mode information generating unit that generates mode information according to the mode flag detected by the mode detecting unit, and at least the mode information generating unit. And a recording processing unit for recording the mode information and a reception signal received by the reception system on the recording medium, a reproduction processing unit for reproducing the recording signal recorded on the recording medium, and the reproduction processing unit. Storage means for storing the received signal reproduced and reproduction mode detection for detecting the mode information reproduced by the reproduction processing means A step, a speed control means for controlling the feeding speed of the recording medium according to the detection mode detected by the reproduction mode detection means, and a reproduction reception signal stored in the storage means, detected by the reproduction mode detection means. A reproduction signal output means for outputting at an output transmission rate according to the detection mode is provided, and at the time of recording, a reception signal and mode information indicating a mode of the reception signal are recorded on the recording medium, and reproduction is performed at the time of reproduction. 14. The digital information recording / reproducing system according to claim 13, wherein the reproducing mode is set in accordance with the mode information. 15. The recording / reproducing system, when the reproduction mode detecting means detects the mode information of the first mode during reproduction, the speed control means sends the recording medium at a first feed speed, The reproduction signal output means outputs the reproduction reception signal at a first output transmission rate, and when the reproduction mode detection means detects mode information of a second mode different from the first mode, the speed control means makes The recording medium is sent at a second feed speed different from the first feed speed, and the reproduction signal output means outputs the reproduction reception signal at a second output transmission rate different from the first output transmission rate. 15. The digital information recording / reproducing system according to claim 14. 16. The recording / reproducing system includes a mode output means for outputting detection mode information detected by the reproduction mode detecting means at the time of reproduction, and the detection mode indicating the reproduction reception signal and the mode of the reproduction reception signal. 16. The digital information recording / reproducing system according to claim 14, wherein the information is output to the decoding system. 17. The plurality of modes is at least a first mode.
And a second mode in which the amount of information per unit time is larger than that of the first mode.
The digital information recording / reproducing system according to claim 16. 18. The digital information recording / reproducing system according to claim 17, wherein among the plurality of modes, the first mode is a standard image mode and the second mode is a high definition image mode. 19. The information signal is image data, and the image compression rate of the image data is different in different modes among the plurality of modes.
A digital information recording / reproducing system according to claim 16.