JP2993367B2 - Digital information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables variable speed control in order to change the number of signals for recording and reproducing time-division multiplexed signals and the recording / reproducing time depending on the elapsed time. The present invention relates to a digital information recording and reproducing device.

[0002]

2. Description of the Related Art Conventionally, a digital signal recording / reproducing apparatus (D
2 or D3 digital VTR, etc., there has not been much one that multiplex-records or reproduces a plurality of time-division multiplexed digital information at a time. To solve this problem, Japanese Patent Application Laid-Open No. 4-130883 discloses a digital information recording / reproducing apparatus capable of multiplex recording / reproducing. The configuration of the digital information recording / reproducing apparatus disclosed in the above publication and its use will be briefly described as a conventional example.

[0003] A conventional digital information recording / reproducing apparatus will be described below. FIG. 6 is a block diagram showing a configuration of a conventional digital information recording / reproducing apparatus. In FIG.
Is an input terminal for inputting a plurality of video signals in a time-division multiplexed manner, 2 is a recording selection input terminal for selecting one or a plurality of recording signals from the input signals, and 3 is a recording for selecting a recording signal from the input signals. A signal selection circuit 4, a recording signal processing circuit 4 for digitally processing a recording signal and recording it on a medium, a servo circuit 8 for controlling recording and running on the medium, and a selector 9 for selecting a signal to be reproduced and output from the multiplex-recorded signal. A reproduction signal selection circuit 10, a reproduction signal processing circuit for digitally processing and outputting a reproduction signal, a reproduction selection input terminal 11 for selecting one or a plurality of output signals from the reproduction signals, and a reproduction signal output terminal 12 is there.

A digital information recording / reproducing apparatus configured as described above will be described. The time-division multiplexed video signal input from the signal input terminal 1
To select a recording signal. In addition, the recording signal selection circuit 3 determines the number of multiplexed time-division multiplexed video signals at the time of input, the transfer speed, and the number of recordings selected by the recording signal.
A speed control signal is generated and output to the recording signal processing circuit 4 and the servo circuit 8. At the time of reproduction, I
The number of multiplexed recording signals is detected from the D signal, a speed control signal is generated, and this speed control signal is sent to the servo circuit 8. Thus, all signals recorded so that the recording track pattern on the tape is the same can be traced regardless of the number of selective multiplexes of the recording signal.

[0005] 1 / K selected from the input digital signal
A time-division multiplexed digital signal that is time-division-compressed by a factor of two and time-division multiplexed by time-division multiplexing is recorded with the time-axis-compressed speed unchanged. , The recording track and the reproduction track match, and the N kinds of signals are reproduced at the standard speed by reproducing at a time K / N times the recording time.

[0006]

However, in the above-described conventional configuration, when the number of multiplexed input signals to be recorded / reproduced by time division multiplexing and the input transfer rate are changed during recording / reproducing on the recording medium. No consideration was given to recording and playback. For example, a method of time-shifting the same program content for a fixed time and independently distributing it repeatedly (hereinafter referred to as near video on demand) is adopted, and the digital information recording / reproducing apparatus having the conventional configuration is provided to the data transmission side. The case of installation will be described. FIG. 4 is a time chart showing the data output of the digital information recording / reproducing apparatus output at time shift intervals. In the near-video-on-demand service, as shown in FIG. 4, the number of multiplexes changes at time shift intervals, and the output signal amount changes. However, in the conventional configuration, information such as the recording speed is not recorded on the recording medium. The digital information multiplexed in advance is reproduced at an arbitrarily determined speed.
Since it is not possible to cope with a dynamic change in the recording or reproduction speed in accordance with the recording amount or the content of the digital information, some information is recorded and reproduced in the portion shown by the dotted line in FIG. Then, it is necessary to select digital information to be output at the time of output and to perform selection control for sending out only necessary signals.

[0007] The present invention is intended to solve the conventional problems described above, the time-division multiplexed signal, and recorded by adding multiplexing and recording velocity information, at the time of recording or reproducing, multiplexing and Digi
Recording or reproduction by performing speed control according to the recording speed information, which may differ for each piece of recording information, enables recording and reproduction in accordance with the amount of recording information. It is an object of the present invention to provide a digital information recording / reproducing apparatus which outputs only the information.

[0008]

In order to achieve this object, a digital information recording / reproducing apparatus according to the present invention is arranged such that the number of multiplexed digital information differs from each digital information.
Recording information generating means for determining a recording speed from certain input transfer speed information and generating recording information necessary for recording on a recording medium, and a speed control means for controlling recording on the recording medium at the recording speed. Recording signal generating means for generating a recording signal on a recording medium from the plurality of types of digital information and the recording information; and a plurality of types of the digital information and the recording information from the recording signal recorded on the recording medium. A reproduction signal selection unit that separates and outputs each of them; and a reproduction information detection unit that detects the multiplex number and output transfer speed information from the separated recording information.

[0009]

According to the present invention, according to the above-mentioned configuration, the recording information generating means can determine the number of multiplexed digital information and
The recording information is generated in accordance with the dynamic change of the input transfer speed information which may be different , the recording signal generating means generates the recording signal including the recording information as needed, and is separated from the reproduction signal selecting means at the time of reproduction. By detecting the multiplex number and the output transfer rate information from the recorded information, the information is recorded for each digital information.
Recording and reproduction according to the amount of recording information are performed dynamically even if the recording and reproduction speed information is different . According to the present invention, the recording information generating means generates the recording information according to the multiplexing number of the digital information and the dynamic change of the input transfer rate information which may be different for each digital information, and generates the recording signal as needed. by means generates a recording signal including the recorded information, detects the number of multiplexed and output transfer speed information from the recording information separated from the reproduced signal selecting means during reproduction, di
Even if the recording and reproduction speed information is different for each digital information, the recording and reproduction are dynamically performed according to the recording information amount.

[0010]

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

FIG. 1 is a block diagram showing a configuration of a digital information recording / reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, reference numeral 21 denotes a digital information input terminal to which digital information such as a plurality of video signals is input in a time-division multiplexed manner, and reference numeral 22 denotes input of control information including the number of multiplexed digital information and information on each input transfer rate. A control information input terminal 24, a recording information generating means for determining a recording speed from the input control information and generating recording information to be recorded on a recording medium, and a recording means 23 for multiplex recording on the recording medium from the digital information and the recording information. Recording signal generating means for generating a signal; 25, a speed control means for controlling a recording traveling speed on a recording medium; 27, a reproduction signal selecting means for separating and outputting digital information and recording information from a multiplex-recorded signal; Reproduction information detection means for detecting information such as recording speed from the recording information and obtaining output transfer speed information; 30 is a control information output terminal for outputting recording information; A digital information output terminal.

A digital information recording / reproducing apparatus according to the present embodiment, constructed as described above, will be described. The digital information input terminal 21 is directly input with time-division multiplexed digital information such as a plurality of types of digital video signals. On the other hand, the control information input terminal 22 receives control information on input signals including the number of multiplexed signals and input transfer rate information of each signal. The recording information generating means 24 determines a recording speed for recording on the recording medium from the input control information.
When digital information is input at an input transfer speed higher than the speed that can be recorded on a recording medium, the input transfer speed of digital information input by time division multiplexing is reduced.
A command is output from the control information output terminal 30. And
From the control information, recording information is generated by extracting only the recording information components necessary for reproduction. For example, even if the control information includes the number of multiplexes, the input transfer speed information of each digital information, the ID information indicating the type of each digital information, the information indicating the contents of the digital information, etc. Only information necessary for speed control and multiplex recording is recorded, and nothing is involved in the contents of digital information. As a result, the present invention can be used as a digital information recording / reproducing apparatus that does not limit applications such as video use.

The recording signal generating means 23 generates a recording signal to be recorded on a recording medium from the digital information and the recording information. The recording signal generating means 23 generates a signal for sequentially switching and recording the time-division multiplexed digital information for each track on a tape as a recording medium. Then, a signal for recording the ID information of the digital information, the number of multiplexed signals, and the recording information of the recording speed is generated for each track. FIG. 2 shows an example of this recording signal. Reference numeral 41 shows the contents of the recording signal. Here, three types of digital information are input, the number of multiplexed signals is three, and the recording speed information is three. Digital information with ID information is recorded for each track. The recording unit need not be a track unit, but may be a fixed information amount unit. If the recording medium is a disk or the like, the sector unit may be more convenient. If the digital information is image information, the unit may be determined according to the type of recording medium or the type of digital information, such as a unit indicating information in units of one field. It suffices if the speed control is performed for each recording unit so that the multiplexed information can be separately recorded and reproduced.

The speed control means 25 generates a clock signal based on the determined recording speed and controls the running of the recording medium. When the recording medium is a magnetic tape, a recording signal is recorded / reproduced on a helical track on the magnetic tape using a rotary head, and the rotational speed of a drum attached to the rotary head and the driving speed of the magnetic tape are controlled by speed control means. 25.

At the time of reproduction, the reproduction signal selecting means 27 separates and outputs a plurality of types of digital information and recording information from the recording signal recorded on the recording medium. Digital information is output from a digital information output terminal 31, and recorded information is output from a control information output terminal 30. FIG. 2 shows an example of output data of digital information and recording information output at this time. 42 indicates the contents of the output data. Here, an example is shown in which three types of digital information (corresponding to a, b, and c) and one type of recording information (corresponding to d) are output. As shown in FIG. 2, a configuration may be adopted in which a multiplexed signal is divided and output from a time-division multiplexed recording signal. Also, at the time of output, digital information as it is time-division multiplexed and recorded information may be output. CATV
It may be more convenient to directly output the digital signal as it is multiplexed on the transmission line (rather than one program at a time, but to collectively distribute a plurality of programs), for use in output applications such as. A control information input terminal 22 is connected to the
With a configuration in which the output form information is input, both demands can be met.

The reproduction information detecting means 28 detects the multiplex number and the output transfer speed information from the separated record information, outputs the information from the control information output terminal 30, and outputs the detected output transfer speed information to the speed control means 25. To control the reproduction speed of the recording medium. The reproduction speed is obtained in the same manner as in the conventional example. Time axis compressed to 1 / K times, N
Since the time-division multiplexed digital information is time-division multiplexed and recorded at the time-compressed speed, the speed control means 25 increases the cylinder rotation speed and the tape speed by N / K times during reproduction. If set, the recording track and the reproduction track match, and N types of signals can be reproduced at a standard speed by reproducing at a time K / N times the recording time. Further, the output transfer speed information is transmitted to the control information input terminal 2.
2 from the standard output transfer rate of K / N times,
It may be configured such that output transfer speed information for reproducing at M times speed can be given.

In the conventional example, only ID information and the like are added to digital information and recorded. Since the speed information is not recorded, the speed is set to a predetermined constant speed based on the number of multiplexes and the like. After that, control is performed so that the ID information can be read at a pre-calculated interval using the ID information and the like. It had been. Therefore, a description will be given below of an embodiment in which the number of multiplexed digital information to be input and each input transfer speed information dynamically change.

Recording information generating means 24 generates recording information in accordance with the number of multiplexed digital information signals and the dynamic change of each input transfer speed information. Next, the recording signal generating means 2
3 generates a recording signal including recording information as needed. For example, FIG. 3 shows an example of a recording signal when the recording speed dynamically changes. In FIG. 3, reference numeral 43 shows the contents of the recording signal. As with the recording signal 41 of FIG. 2, in addition to digital information, ID information and information on the multiplex number and recording speed are recorded. Also at this time, a signal to be sequentially switched and recorded for each track is generated on a tape as a recording medium, and the ID information of the digital information, the signal multiplex number, and the recording information of the recording speed are recorded for each track. A signal can be generated. In FIG. 3, first, the digital information is recorded at the recording speed 1 (standard speed) at the multiplex number 1 (no multiplex), then at the recording speed 2 at the multiplex number 2 and finally at the recording speed 3 at the multiplex number 3. 3 shows the contents of the recording signal 43 recorded in correspondence with.

At the time of reproduction, the reproduction information detecting means 28 detects the multiplex number and output transfer speed information from the recorded information separated from the reproduction signal selecting means 27. Then, the speed control means 25 dynamically controls the reproduction speed from the output transfer speed information, so that the digital information recorded by time division multiplexing can be output. In FIG. 3, reference numeral 44 denotes an example of output data of digital information. Here, an example is shown in which three types of digital information are separately output. However, a form in which the three types of digital information are output in a time-division multiplexed manner may be used. Also, the recording information is output in accordance with the output of the digital information. FIG. 3 shows an example in which the multiplex number and the recording speed are dynamically changing.

However, in recording and reproducing digital information while the speed is being changed, it is necessary to configure the digital information so that no information is lost. Even while the speed is changing, the reproduction signal selection means 27 grasps the recording unit (for example, track unit) and synchronizes the recording so that the time-division multiplexed digital information can be correctly recorded and reproduced. It is desired to regenerate. It is desired that the output data have a certain recording buffer (comprising a semiconductor memory or the like) so that it can be output at a constant output transfer rate.

Further, another method of realizing recording and reproduction of digital information while changing the speed will be described.

As a first method, when a change in the number of multiplexes of digital information occurs, a recording signal is generated for a certain period of time from the recording speed before the occurrence to the recording speed after the occurrence by the speed control means 25. The means 23 does not record a plurality of types of digital information but generates a recording signal of only the recording information. With this configuration, no digital information is recorded or reproduced while the speed is changing. However, in other places, signals recorded at the determined recording speed can always be reproduced. The recording signal generation means 23 and the reproduction signal selection means 27 have a recording buffer (comprising a semiconductor memory or the like). This is because a function is required to temporarily store digital information until the recording speed becomes constant during recording, or to temporarily store digital information during reproduction so that the output of the digital information can be output at a constant output transfer speed.

As a second method, when a change in the multiplexing number of digital information occurs, a recording signal is generated for a certain period of time from the recording speed before the occurrence to the recording speed after the occurrence by the speed control means 25. The means 23 is configured to generate a recording signal for recording invalid digital information. As in the first method, the recording signal generation means 23 and the reproduction signal selection means 27 have a recording buffer (comprising a semiconductor memory or the like), and temporarily store inputs until the recording speed becomes constant. It has a temporary storage configuration so that it can be output at a constant output transfer rate.

When the input transfer speed of each of the plurality of types of digital information is different, the record information generating means 24 creates the record information in which the sum of the input transfer speeds of each digital information and the input transfer speed ratio are calculated, and generates the record signal. Generating means 23,
What is necessary is just to generate the recording signal according to the input transfer speed ratio. For example, the input transfer rate may differ depending on the input, for example, the input transfer rate of certain digital information is 2 and the input transfer rate of another digital information is 3. It is also assumed that the same digital information has a different input transfer speed depending on time. It must be able to handle and record this information dynamically.

When the recording medium is constituted by a removable recording medium such as a magnetic tape, recording and reproduction are not always performed in the same digital information recording / reproducing apparatus. The same operation as the above embodiment can be realized when recording is performed by the recording digital information recording / reproducing apparatus and is reproduced by the reproducing digital information recording / reproducing apparatus. For example,
Recording is used when a plurality of distribution tapes are created from a master tape using a copying machine, or when the master tape itself is created. On the other hand, reproduction is performed by a broadcasting station that provides services such as CATV such as near video on demand. Of course, it may be used in ordinary households.

There is also a demand for making the recording speed different from the reproduction speed. For example, there is a desire to perform high-speed dubbing. There is no need to create real time tapes for distribution. In the case of digital information, recording may be performed at high speed as long as the content is not changed. At this time, M times the normal input transfer speed information and digital information that is time-division multiplexed and input from the control information input terminal 22 are also input at the M times speed and are recorded at the M times the normal speed. However, the configuration is such that a desired reproduction speed can be obtained by reproducing at the recorded 1 / M speed. The same applies when recording at standard speed and reproducing at high speed. Therefore, the recording speed information is
It is composed of a plurality of information such as recording information (including speed) for standard recording / reproduction and recording information for high-speed recording / reproduction.
Alternatively, if there is recording information for standard recording and reproduction and conversion information for high-speed recording information, it is possible to cope with a difference in recording speed and reproduction speed.

Using the configuration of the present embodiment, it is easy to execute near video on demand, in which the same program content is time-shifted for a predetermined time and independently and repeatedly delivered. As shown in the time chart of FIG. 4, when the number of multiplexes changes at the time shift interval and the amount of output signals changes, the number of multiplexed distribution programs is dynamically changed at the time shift interval. be able to. Further, the recording signal recorded on the recording medium for that purpose does not need to have the information corresponding to the portion shown by the dotted line in FIG. 4 because the recording according to the recording information amount is possible. By using the configuration of the present embodiment, as in the example of the output data 44 in FIG. 3, it can be used for outputting a plurality of digital information while shifting the time shift interval. The distribution signal does not require the selection control to select a necessary signal from the output signal as in the conventional example, and the output signal can be used as the distribution signal as it is. Compared to the conventional example, recording can be performed for a longer time by using the portion corresponding to the recording capacity indicated by the dotted line in FIG. In the conventional example, there is a possibility that the recording time can be extended even when it is not possible due to the restriction of the recording time of the tape.

Next, a second embodiment will be described. FIG. 5 shows a block diagram of a configuration of a digital information recording / reproducing apparatus which realizes the second embodiment. In FIG. 5, reference numeral 29 denotes multiplexed information storage means having a function of storing output transfer rate information output from the reproduction information detection means 28 for a predetermined period of time. Other configurations are the same as those of the first embodiment. Then, the recording signal generating means 23 generates a recording signal in which the recording information at a position before a predetermined time has been changed when the number of multiplexed digital information and each input transfer speed information change, and records the recording signal on the recording medium. It is constituted so that.

When the number of multiplexes and the input transfer speed information change, the recording speed is changed and the recording is performed. When the reproduction is performed, the point where the reproduction speed is changed is set in advance (before a certain period of time). ), To notify the speed control means 25 to facilitate the change of the reproduction speed. For this purpose, a recording signal in which the recording information at a position a predetermined time before the point where the recording speed change has occurred is changed and recorded is generated.

Further, the speed control means 25 is configured to read out the output transfer speed information stored from the multiplexed information storage means 29 until a predetermined time has elapsed, and generate a reproduction speed signal. This fixed time indicates the time from when a request for changing the rotation speed is received to when the speed is actually changed and the speed is stabilized.

For this purpose, both the output transfer speed information stored in the multiplexing information storage means 29 and the current reproduction speed information detected by the reproduction information detection means 28 are referred to, and after a certain period of time, The speed control means 25 may be configured to generate a playback speed signal that matches the playback speed of the stored data with the stored output transfer speed information. By referring to both pieces of information, speed control is performed faster and more accurately.

The method for configuring the recording and reproduction of digital information correctly while the speed is being changed is the same as that of the first embodiment. Even if the multiplexing number of digital information and the input transfer rate are dynamically changed, the recording is performed according to the change by using the method of generating the recording signal of the digital information and the method of generating the recording information such as the recording speed. Also, a device capable of reproducing can be configured.

Further, the recording signal generating means 23 stores the dynamically changed recording information change, and after recording all the digital information, collects the recording information at the time of occurrence of the change as recording format information. It may be configured to record. First, at the time of reproduction, the recording format information is first read out by the reproduction signal selection means 27 and stored in the multiplexed information storage means 29. Then, control such as controlling the reproduction speed according to the stored speed information becomes possible.

As described above, when the recording speed is changed, in order to perform speed control according to the multiplex number and the recording speed information, the contents of the change in the recording speed are recorded in advance, and the reproduced speed is read in advance during reproduction. By changing the reproduction speed according to the contents, it is possible to provide a digital information recording / reproducing apparatus which can easily cope with variable speed recording and reproduction.

[0035]

According to the above present invention, multiplexing and each digital recording information generation means digital information
The recording information is generated according to the dynamic change of the input transfer speed information which may be different for each information, and the recording signal generating means generates the recording signal including the recording information as needed, and separates the recording signal from the reproduction signal selecting means at the time of reproduction. The digital information is detected by detecting the multiplex number and the output transfer rate information from the recorded information.
A digital information recording / reproducing device that has high recording efficiency and outputs only necessary information to dynamically perform recording and reproduction according to the amount of recording information even if the recording and reproduction speed information differs for each can do.

[Brief description of the drawings]

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

FIG. 2 is a signal configuration diagram of a recording signal and output data in the first embodiment.

FIG. 3 is a signal configuration diagram of a recording signal and output data in the first embodiment.

FIG. 4 is a time chart of data output of the digital information recording / reproducing apparatus in the first embodiment and the conventional example.

FIG. 5 is a block diagram showing a configuration of a digital information recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a digital information recording / reproducing apparatus in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Digital information input terminal 22 Control information input terminal 23 Record signal generation means 24 Record information generation means 25 Speed control means 27 Reproduction signal selection means 28 Reproduction information detection means 30 Control information output terminal 31 Digital information output terminal

Claims (7)

(57) [Claims] 1. A digital information recording / reproducing apparatus for recording / reproducing a plurality of types of digital information time-division multiplexed on a recording medium at a variable speed, comprising: a plurality of types of digital information; a multiplexing number of the digital information; It may be different for each digital information.
That as input control information including an input transfer rate information, the recording speed is determined and the recording speed and the recording information generating means for generating, to the determined recording information on the recording medium from the control information to the recording medium Or a speed control means for controlling the speed of the recording medium at a reproduction speed; a recording signal generating means for generating a recording signal for the recording medium from the plurality of types of digital information and the recording information; and a recording signal recorded on the recording medium. Reproduction signal selecting means for separating a plurality of types of digital information and recording information from the recording signal and outputting each of them; reproducing information detection for detecting the multiplex number and output transfer speed information from the separated recording information Means, wherein the recording information generating means comprises: a multiplex number of the digital information; and an input transfer rate of each of the plurality of types of digital information.
When the digital information is different,
Before calculating each input transfer rate ratio from the sum of the transfer rates
Recording information, and the recording signal generating means generates the recording information.
By generating a recording signal including the recording information according to the transfer speed ratio and detecting the multiplex number and output transfer speed information from the recording information separated from the reproduction signal selection unit during reproduction, the speed control unit A digital information recording / reproducing apparatus characterized by dynamically controlling a reproducing speed. 2. A constructed recording medium a detachable serial <br/> recording medium such as a magnetic tape, reproducing the recorded digital information, it is not always be performed in the same digital information recording and reproducing apparatus 2. The digital information recording / reproducing apparatus according to claim 1, wherein: 3. A digital information recording / reproducing apparatus for recording / reproducing a plurality of types of time-division multiplexed digital information on a recording medium at a variable speed, comprising: a plurality of types of digital information; a multiplexing number of the digital information; It may be different for each digital information.
That as input control information including an input transfer rate information, the recording speed is determined and the recording speed and the recording information generating means for generating, to the determined recording information on the recording medium from the control information to the recording medium Or speed control means for controlling the speed of the recording medium at a reproduction speed; and recording for generating a recording signal to the recording medium from the plurality of types of digital information and the recording information while obtaining speed control information from the speed control means. Signal generation means; reproduction signal selection means for separating a plurality of types of digital information and the recording information from the recording signal recorded on the recording medium and outputting each; and multiplexing from the separated recording information. Playback information detecting means for detecting the number of the digital information and the output transfer rate information, wherein the recording signal generating means changes the multiplex number of the digital information and the input transfer rate of each. At the time of occurrence, the recording signal of only the recording information is recorded without recording the digital information for a certain period of time until the recording speed is changed from the recording speed before the occurrence of the change by the speed control unit to the recording speed after the occurrence of the change. Generating and detecting the multiplex number and output transfer rate information from the recording information separated from the reproduction signal selection means during reproduction, whereby the speed control means dynamically controls the reproduction speed. Information recording and playback device. 4. A digital information recording / reproducing apparatus for recording / reproducing a plurality of types of time-division multiplexed digital information on a recording medium at a variable speed, comprising: a plurality of types of digital information; a multiplexing number of the digital information; It may be different for each digital information.
That as input control information including an input transfer rate information, the recording speed is determined and the recording speed and the recording information generating means for generating, to the determined recording information on the recording medium from the control information to the recording medium Or speed control means for controlling the speed of the recording medium at a reproduction speed; and recording for generating a recording signal to the recording medium from the plurality of types of digital information and the recording information while obtaining speed control information from the speed control means. Signal generation means; reproduction signal selection means for separating a plurality of types of digital information and the recording information from the recording signal recorded on the recording medium and outputting each; and multiplexing from the separated recording information. Playback information detecting means for detecting the number of the digital information and the output transfer rate information, wherein the recording signal generating means changes the multiplex number of the digital information and the input transfer rate of each. At the time of occurrence, the speed control means generates a recording signal for recording invalid digital information for a fixed time until the recording speed is changed from the recording speed before the occurrence of the change to the recording speed after the occurrence of the change. By detecting the multiplex number and the output transfer rate information from the recording information separated from the signal selecting means and outputting the digital information after eliminating invalid digital information, the speed control means dynamically controls the reproducing speed. Digital information recording / reproducing device. 5. A digital information recording / reproducing apparatus for recording / reproducing a plurality of types of time-division multiplexed digital information on a recording medium at a variable speed, comprising: a plurality of types of digital information; a multiplexing number of the digital information; It may be different for each digital information.
That as input control information including an input transfer rate information, the recording speed is determined and the recording speed and the recording information generating means for generating, to the determined recording information on the recording medium from the control information to the recording medium Or a speed control means for controlling the speed of the recording medium at a reproduction speed; a recording signal generating means for generating a recording signal for the recording medium from the plurality of types of digital information and the recording information; and a recording signal recorded on the recording medium. Reproduction signal selecting means for separating a plurality of types of digital information and recording information from the recording signal and outputting each of them; reproducing information detection for detecting the multiplex number and output transfer speed information from the separated recording information Means, and multiplexed information storage means for storing output transfer rate information detected and output from the reproduction information detection means, wherein the recorded information generation means The recording information is generated according to the multiplexing number of the digital information and the dynamic change of each input transfer rate information, and the recording signal generating means generates a recording signal including the recording information as needed, The multiplex number and the output transfer speed information are detected from the recording information separated from the selecting unit, and the speed control unit reads out the output transfer speed information stored until after a predetermined period of time has elapsed. A digital information recording / reproducing apparatus, wherein a speed control means dynamically controls a reproducing speed. 6. A recording information generating means detects a multiplex number of digital information and an occurrence of a change in each input transfer speed information and generates recording information having the changed contents, and said recording signal generating means is a predetermined recording signal generating means. 6. The digital information recording / reproducing apparatus according to claim 5, wherein a recording signal for changing recording information of a recording position at a predetermined time before is generated, and the recording signal is recorded at the recording position at the predetermined time before on a recording medium. 7. Reference is made to both the output transfer speed information stored in the multiplexing information storage means and the current reproduction speed information detected by the reproduction information detection means, and by a predetermined time, 7. The digital information recording / reproducing apparatus according to claim 6, wherein the speed control means detects a current reproducing speed and generates a reproducing speed signal that matches the stored output transfer speed information.