JPH07320399A - Digital information recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a digital information recording and reproducing device which can record information at a high efficiency and only outputs necessary information by performing recording or reproduction by controlling the speed in accordance with the multiplexing number or speed of digital information multiplexed in time division or input transferring speed information when the multiplexing number or speed changes with time. CONSTITUTION:A recording information preparing means 24 prepares recording information in accordance with the dynamic change of the multiplexing number of digital information and each input transferring speed information and a speed controlling means 25 controls the speed of a recording medium to a decided recording speed. Then a means 23 which generates recording signals any time generates a recording signal from the digital information and recording information and records the signals. At the time of reproduction, a reproduced signal selecting means 27 separates the recording information from the digital information and reproduced information detecting means 28 detects the multiplexing number and output transferring speed information from the separated recording information. In addition, the means 25 dynamically changes the reproducing speed. Therefore, the time-division multiplexed digital information which dynamically changes in recording quantity can be recorded and reproduced.

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 or reproducing time-division multiplexed signals and the recording / reproducing time depending on the elapsed time. The present invention relates to a digital information recording / reproducing apparatus.

[0002]

2. Description of the Related Art Conventionally, a digital signal recording / reproducing apparatus (D
2 or D3 digital VTR, etc.), there are not many that perform multiplex recording or reproduction of a plurality of time division multiplexed digital information at once. To solve this problem, Japanese Patent Laid-Open No. 4-130883 discloses a digital information recording / reproducing apparatus capable of multiple recording / reproducing. The structure of the digital information recording / reproducing apparatus of the above publication and the method of using the same will be briefly described as a conventional example.

A conventional digital information recording / reproducing apparatus will be described below. FIG. 6 is a block diagram showing the configuration of a conventional digital information recording / reproducing apparatus. In FIG. 6, 1
Is an input terminal to which a plurality of video signals are time-division multiplexed and input, 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 recording signals from the input signals A signal selection circuit, 4 is a recording signal processing circuit for digitally processing a recording signal and recording it on a medium, 8 is a servo circuit for controlling recording traveling to the medium, and 9 is a signal to be reproduced and output from the multiple recorded signals. A reproduction signal selection circuit, 10 is a reproduction signal processing circuit which digitally processes and outputs the reproduction signal, 11 is a reproduction selection input terminal for selecting one or a plurality of output signals from the reproduction signal, and 12 is a reproduction signal output terminal is there.

A digital information recording / reproducing apparatus having the above structure will be described. The time division multiplexed video signal input from the signal input terminal 1 is recorded by the recording signal selection circuit 3
Then, the recording signal is selected. In addition, the recording signal selection circuit 3 determines, based on the number of multiplexed time-division multiplexed video signals at the time of input, the transfer rate, and the number of selected recordings 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 included in the reproduction signal
The number of multiplexed recording signals is detected from the D signal to generate a speed control signal, and the speed control signal is sent to the servo circuit 8. As a result, all the signals recorded so that the recording track patterns on the tape are the same can be traced regardless of the selected multiplex number of the recording signals.

1 / K selected from the input digital signal
After time-division-multiplex recording of a digital signal that is time-axis-compressed twice and time-division-multiplexed N times, at the time-axis-compressed speed as it is, the number of cylinder revolutions or tape speed is multiplied by N / K. If set to, the recording track and the reproducing track coincide with each other, and N kinds of signals are reproduced at the standard speed by reproducing for K / N times the recording time.

[0006]

However, in the above 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 the recording and playback of the. For example, by adopting a method (hereinafter, referred to as near video-on-demand) in which the same program content is time-shifted for a fixed time and independently and repeatedly distributed, the digital information recording / reproducing apparatus having this conventional configuration is provided on 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 which is output at time shift intervals. In the near video on-demand service, as shown in FIG. 4, the number of multiplexed signals changes and the output signal amount changes at time shift intervals. However, with the conventional configuration, information such as the recording speed is not recorded on the recording medium. The digital information pre-multiplexed is reproduced by setting an arbitrarily determined speed.
Since it is not possible to cope with the dynamic change of the recording or reproducing speed depending on the recording amount or 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 perform a selection control so as to select digital information to be output at the time of output and send out only necessary signals.

The present invention is intended to solve the above-mentioned conventional problems, in which the multiplexed number and recording speed information are added to a time-division multiplexed signal and recorded, and the multiplexed number and recording speed information are recorded at the time of recording or reproducing. Provided is a digital information recording / reproducing apparatus which has high recording efficiency and can output only necessary information because recording and reproduction can be performed according to the amount of recorded information by performing recording / reproducing by controlling the speed according to the recording / reproducing. The purpose is to

[0008]

In order to achieve this object, a digital information recording / reproducing apparatus of the present invention determines a recording speed from the number of multiplexed digital information and each input transfer speed information, and transfers the information to a recording medium. Recording information generating means for generating recording information necessary for recording, speed control means for controlling speed of recording on the recording medium at the recording speed, recording of plural kinds of the digital information and the recording information on the recording medium. Recording signal generating means for generating a signal, reproduction signal selecting means for separating a plurality of types of the digital information and the recording information from the recording signal recorded on the recording medium and outputting each of the pieces of digital information, and the separated signal The reproduction information detecting means detects the multiplex number and the output transfer rate information from the record information.

[0009]

According to the present invention, the recording information generating means generates recording information according to the number of multiplexed digital information and the dynamic change of each input transfer rate information, and the recording signal generating means records the recording information at any time. By generating a recording signal containing information and detecting the number of multiplexes and output transfer rate information from the recording information separated from the reproduction signal selecting means at the time of reproduction, recording and reproduction can be dynamically performed according to the amount of recorded information. To do.

[0010]

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

FIG. 1 is a block diagram showing the arrangement of a digital information recording / reproducing apparatus according to the first embodiment of the present invention. In FIG. 1, reference numeral 21 is a digital information input terminal to which digital information such as a plurality of video signals is time-division multiplexed and input, and reference numeral 22 is input control information including the signal multiplexing number of digital information and each input transfer rate information. A control information input terminal, 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 for multiplex recording on the recording medium from the digital information and the recording information. A recording signal generation means for generating a signal, 25 a speed control means for controlling a recording traveling speed on a recording medium, 27 a reproduction signal selection means for separating and outputting digital information and recording information from a multiplex-recorded signal, and 28 a Reproduction information detecting means for detecting information such as recording speed from recording information to obtain output transfer speed information, 30 is a control information output terminal for outputting recording information, 31 A digital information output terminal.

The digital information recording / reproducing apparatus of this embodiment having the above structure 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 is supplied with control information regarding an input signal including the signal multiplexing number and the input transfer rate information of each signal. The recording information generating means 24 determines the recording speed for recording on the recording medium from the input control information.
When the digital information is input at an input transfer speed that is higher than the speed that can be recorded on the recording medium, the input transfer speed of the digital information that is time-division multiplexed and input is reduced.
A command is output from the control information output terminal 30. And
Recording information is generated by extracting only the recording information component necessary for reproduction from the control information. For example, even if the control information includes the multiplexing number, the input transfer rate 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 the information required for speed control and multiplex recording is recorded, and nothing is involved in the contents of digital information. As a result, it can be used as a digital information recording / reproducing apparatus which is not limited in use for video and the like.

The recording signal generating means 23 generates a recording signal to be recorded on the recording medium from the digital information and the recording information. The recording signal generating means 23 generates a signal for sequentially switching the time-division-multiplexed digital information for each track on the tape, which is a recording medium, for recording. Then, a signal for recording the ID information of the digital information, the signal multiplex number, and the recording information of the recording speed is generated for each track. An example of this recording signal is shown in FIG. 41 shows the content of the recording signal. Here, it is shown that three types of digital information are input, the number of multiplexed signals is 3, and the recording speed information is 3. Also, digital information with ID information is recorded for each track. The recording unit does not have to be a track unit and may be a fixed unit of information amount. If the recording medium is a disk or the like, it may be more convenient to use the sector unit. If the digital information is image information, the unit may be determined according to the type of recording medium and the type of digital information, such as a unit indicating one field unit of information. It suffices if the multiplexed information can be recorded and reproduced separately by controlling the speed for each recording unit.

The speed control means 25 generates a clock signal based on the determined recording speed to control the running of the recording medium. When the recording medium is a magnetic tape, a recording signal is recorded and reproduced on a helical track on the magnetic tape by using a rotary head, and the rotational speed of a drum attached to the rotary head and the drive speed of the magnetic tape are controlled by speed control means. Controlled by 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 the digital information output terminal 31, and recording information is output from the control information output terminal 30. FIG. 2 shows an example of output data of digital information and recording information output at this time. 42 shows the contents of the output data. Here, an example is shown in which three types of digital information (corresponding to a, b, c) and one type of recording information (corresponding to d) are output. As shown in FIG. 2, the multiplexed signal may be divided and output from the time-division multiplexed recording signal. Further, it is also possible to adopt a configuration in which the digital information as it is time-division multiplexed and the recording information are output at the time of output. CATV
It may be more convenient to directly output a digital signal that is still multiplexed on the transmission path (for example, to distribute a plurality of programs together as one), which is used for output applications such as. In order that the output method of these digital information can be selected from the outside, to the control information input terminal 22,
If the configuration is such that the output form information is input, it is possible to meet either request.

The reproduction information detecting means 28 detects the number of multiplexes and the output transfer rate information from the separated recording information, outputs the information from the control information output terminal 30, and outputs the detected output transfer rate information to the speed control means 25. To control the reproduction speed of the recording medium. The method of obtaining the reproduction speed is obtained by the same method as in the conventional example. 1 / K times time axis compression, N
Since the time-division-multiplexed digital information is time-division-multiplex-recorded at the time-axis-compressed speed, the speed control means 25 makes the cylinder rotation speed and the tape speed N / K times during reproduction. If set, the recording track and the reproducing track coincide with each other, and N kinds of signals can be reproduced at the standard speed by reproducing at K / N times the recording time. Furthermore, the output transfer rate information is transferred to the control information input terminal 2
Input from 2, for standard output transfer rate of K / N times,
It may be configured so that output transfer rate information for reproducing at a speed of M times can be given.

In the conventional example, only the ID information or the like is added to the digital information for recording. Since the speed information is not recorded, it is possible to set a predetermined speed based on the number of multiplexes, etc., and then use the ID information or the like to read the ID information at pre-calculated intervals. It had been. Therefore, this embodiment will be described below in the case where the number of multiplexed digital information and each input transfer rate information dynamically change.

The recording information generating means 24 generates recording information according to the number of multiplexed signals of digital information and the dynamic change of each input transfer rate information. Next, the recording signal generating means 2
3 generates a recording signal containing recording information at any time. 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. Similar to the recording signal 41 in FIG. 2, in addition to digital information, ID information and information on the number of multiplexes and recording speed are recorded. Also at this time, a signal for sequentially switching and recording for each track on the tape as the recording medium is generated, 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, digital information is recorded at a multiplexing number of 1 (no multiplexing) at a recording speed of 1 (standard speed), then at a multiplexing number of 2 at a recording speed of 2, and finally at a multiplexing number of 3 at a recording speed of 3. The contents of the recording signal 43 recorded corresponding to

At the time of reproduction, the reproduction information detecting means 28 detects the number of multiplexes and the output transfer speed information from the recording information separated from the reproduction signal selecting means 27. Then, the speed control means 25 dynamically outputs the digital information which is time-division multiplexed and recorded, by dynamically controlling the reproduction speed from the output transfer speed information. In FIG. 3, reference numeral 44 is an example of output data of digital information. Also in this case, the example in which the three types of digital information are separately output is shown, but the form in which the three types are output while being time-division multiplexed 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 number of multiplexes and the recording speed are dynamically changing.

However, in recording and reproducing digital information while changing the speed, it must be constructed so as not to cause loss of information. The reproduction signal selecting means 27 grasps the recording unit (for example, track unit) and records in synchronization so that the time-division-multiplexed digital information can be correctly recorded and reproduced even while the speed is changing. It is desired to reproduce. It is desired that the output data has a certain amount of recording buffer (constituted by a semiconductor memory or the like) so that the output data can be output at a constant output transfer rate.

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

As a first method, when a change occurs in the number of multiplexed digital information, a recording signal is generated for a certain period of time from the recording speed before generation to the recording speed after generation 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 recording information. With this configuration, digital information is not recorded or reproduced while the speed is changing. However, in other locations, the signal recorded at the determined recording speed can always be reproduced. The recording signal generating means 23 and the reproduction signal selecting means 27 have recording buffers (constituted of semiconductor memory or the like). This is because it requires a function of temporarily storing digital information at the time of recording until the recording speed becomes constant, and temporarily storing output of digital information at the time of reproduction so that the output can be output at a constant output transfer speed.

As a second method, when a change in the number of multiplexed digital information occurs, a recording signal is generated for a certain period of time from the recording speed before generation to the recording speed after generation by the speed control means 25. The means 23 is configured to generate a recording signal for recording invalid digital information. Similar to the first method, the recording signal generating means 23 and the reproduction signal selecting means 27 have recording buffers (constituted of semiconductor memory or the like) for temporarily storing the input until the recording speed becomes constant, It has a configuration of temporary storage so that the data can be output at a constant output transfer rate.

When the input transfer rates of a plurality of types of digital information are different, the record information generating means 24 creates the record information in which the sum of the input transfer rates of each digital information and the input transfer rate ratio are created, and the record signal is generated. The generation means 23
The recording signal may be generated according to the input transfer speed ratio. For example, the input transfer rate of a certain digital information is 2, and the input transfer rate of another digital information is 3, so that the input transfer rate may differ depending on the input. In addition, even with the same digital information, the input transfer rate may be different depending on time. It must be possible to handle and record this information dynamically.

If the recording medium is a removable recording medium such as a magnetic tape, recording and reproduction are not always performed in the same digital information recording / reproducing apparatus. Even when recording is performed by the recording digital information recording / reproducing apparatus and is reproduced by the reproducing digital information recording / reproducing apparatus, the same thing as the above-described embodiment can be realized. For example,
Recording is used when making multiple distribution tapes from a master tape using a copier or when making the master tape itself. On the other hand, reproduction is performed on the side of a broadcasting station that provides services such as CATV such as near video on demand. Of course, it may be used at home.

There is also a desire to make the recording speed different from the reproduction speed. For example, there is a desire to dubb at high speed. The time to create a tape for distribution does not have to be real time. In the case of digital information, recording may be performed at high speed as long as the contents are not changed. At this time, the normal M times input transfer rate information and the time-division multiplexed digital information are also input from the control information input terminal 22 at the M times speed and recorded at the normal M times speed. However, the reproduction is performed at the recorded 1 / M speed so that a desired reproduction speed can be obtained. 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 pieces of information such as recording information for standard recording / reproducing (including speed) and recording information for high-speed recording / reproducing
Alternatively, if the recording information for the standard recording / reproducing and the conversion information for the recording information for the high speed are included, it is possible to cope with the difference between the recording speed and the reproducing speed.

By 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 fixed time and repeatedly independently distributed. As shown in the time chart of FIG. 4, when the number of multiplexed signals changes and the output signal amount changes at time shift intervals, the number of distribution programs, which is the number of multiplexed signals, is dynamically changed at time shift intervals. be able to. Further, for that reason, the recording signal recorded on the recording medium does not need to have the information corresponding to the portion shown by the dotted line portion in FIG. 4 because recording according to the recording information amount is possible. The configuration of this embodiment can be used for the purpose of outputting a plurality of digital information while shifting the time shift intervals, as in the example of the output data 44 of FIG. As for the distribution signal, unlike the conventional example, the output signal can be directly used as the distribution signal without the need for selection control for selecting a necessary signal from the output signals. As compared with the conventional example, recording can be performed for a longer time by using a portion corresponding to the recording capacity of the dotted line portion of FIG. In the conventional example, there is a possibility that the recording time can be extended even when it is impossible 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 the configuration of a digital information recording / reproducing apparatus which realizes the second embodiment. In FIG. 5, reference numeral 29 is a multiplexed information storage means having a function of storing the output transfer rate information output from the reproduction information detection means 28 for a predetermined time. Other configurations are similar to those of the first embodiment. Then, the recording signal generating means 23 generates a recording signal in which the recording information at the position of a predetermined time before a predetermined time is changed when the number of multiplexed digital information or each input transfer rate information is changed, and is recorded on the recording medium. To configure.

When the number of multiplexes or the input transfer speed information is changed, the recording speed is changed and recording is performed. However, when the reproduction is performed, a point where the reproduction speed is changed is set in advance (a predetermined time before). ), To notify the speed control means 25 so that the reproduction speed can be easily changed. For this reason, a recording signal in which the recording information at the position before a certain time before the point where the recording speed change occurs is changed is generated and recorded.

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 certain time has elapsed, and generate a reproduction speed signal. The certain period of time indicates a period of time from when a request for changing the rotation speed is received to when the rotation speed is actually changed and the speed is stabilized.

For that purpose, both the output transfer speed information stored in the multiplexed information storage means 29 and the current reproduction speed information detected by the reproduction information detecting means 28 are referred to, and after the elapse of a certain time, the present The speed control unit 25 may be configured to generate a reproduction speed signal that matches the reproduction speed of the output reproduction speed information stored in the output reproduction speed information. By referring to both information, speed control is performed faster and more accurately.

The method for constructing the recording and reproducing of the digital information correctly while changing the speed is the same as that of the first embodiment. By using the method of generating the recording signal of digital information and the method of generating the recording information such as the recording speed, even if the number of multiplexed digital information or the input transfer speed is dynamically changed, recording is performed according to the change. Also, a device capable of reproducing can be configured.

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

As described above, in order to control the speed in accordance with the number of multiplexes and the recording speed information when changing the recording speed, the contents of the change of the recording speed are recorded in advance, and at the time of reproduction, the speed previously read in advance is recorded. 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]

As described above, according to the present invention, the recording information generating means generates the recording information according to the number of multiplexed digital information and the dynamic change of each input transfer rate information, and generates the recording signal at any time. Means generates a recording signal containing the recording information, and detects the multiplex number and the output transfer rate information from the recording information separated from the reproduction signal selecting means at the time of reproduction, thereby dynamically responding to the amount of recording information. In order to perform recording and reproduction, it is possible to configure a digital information recording / reproducing apparatus which has high recording efficiency and outputs only necessary information.

[Brief description of drawings]

FIG. 1 is a block diagram showing the 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 diagram 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 the configuration of a digital information recording / reproducing apparatus in a conventional example.

[Explanation of symbols]

 21 digital information input terminal 22 control information input terminal 23 recording signal generation means 24 recording 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 (8)

[Claims] 1. 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. Recording information generation means for inputting control information including input transfer speed information, determining recording speed to the recording medium from the control information and generating recording information to the recording medium, and the determined recording speed or Speed control means for controlling the speed of the recording medium at a reproduction speed; 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 the recording signal recorded on the recording medium. From the recording signal, a plurality of types of the digital information and the reproduction information selecting means for separating the recording information and outputting each, and from the separated recording information The recording information generating means has a reproduction information detecting means for detecting the multiplexing number and the output transfer rate information, and the recording information generating means records the recording information in accordance with the multiplexing number of the digital information and the dynamic change of each input transfer rate information. By generating information, the recording signal generating means at any time generates a recording signal containing the recording information, and detecting the multiplex number and the output transfer rate information from the recording information separated from the reproduction signal selecting means at the time of reproduction. A digital information recording / reproducing apparatus, wherein the speed control means dynamically controls the reproducing speed. 2. When the input transfer rates of a plurality of types of digital information are different, the recording information generation means calculates a total of the input transfer rates of the plurality of types of the digital information and each input transfer rate ratio. 2. The digital information recording / reproducing apparatus according to claim 1, wherein the recording information is generated, the recording signal generating means generates a recording signal according to the input transfer speed ratio, and records the recording signal on a recording medium. 3. The recording medium is composed of a removable recording medium such as a magnetic tape, and recording and reproducing of digital information are not necessarily performed in the same digital information recording / reproducing apparatus. 1. A digital information recording / reproducing apparatus according to 1. 4. A digital information recording / reproducing apparatus for recording / reproducing a plurality of types of time-division-multiplexed digital information on / from a recording medium at a variable speed. Recording information generation means for inputting control information including input transfer speed information, determining recording speed to the recording medium from the control information and generating recording information to the recording medium, and the determined recording speed or Speed control means for controlling the speed of the recording medium at a reproduction speed; and a recording signal for generating a recording signal from the plurality of types of digital information and the recording information to the recording medium while obtaining speed control information from the speed control means. Generating means, and a reproducing unit for separating the plurality of types of digital information and the recording information from the recording signal recorded on the recording medium and outputting each of them. The recording signal generating means has a signal selecting means and a reproduction information detecting means for detecting the multiplex number and the output transfer rate information from the separated recording information, and the recording signal generating means has the multiplex number of the digital information and each input transfer. When a speed change occurs, the digital information is not recorded for a certain period of time from the recording speed before the change is generated to the recording speed after the change is generated by the speed control unit, and only the recording information is recorded. The speed control means dynamically controls the reproduction speed by generating a recording signal and detecting the multiplexing number and the output transfer speed information from the recording information separated from the reproduction signal selecting means at the time of reproduction. 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, wherein a plurality of types of the digital information, the number of multiplexed digital information, and the number of multiplexed digital information are recorded. Recording information generation means for inputting control information including input transfer speed information, determining recording speed to the recording medium from the control information and generating recording information to the recording medium, and the determined recording speed or Speed control means for controlling the speed of the recording medium at a reproduction speed; and a recording signal for generating a recording signal from the plurality of types of digital information and the recording information to the recording medium while obtaining speed control information from the speed control means. Generating means, and a reproducing unit for separating the plurality of types of digital information and the recording information from the recording signal recorded on the recording medium and outputting each of them. The recording signal generating means has a signal selecting means and a reproduction information detecting means for detecting the multiplex number and the output transfer rate information from the separated recording information, and the recording signal generating means has the multiplex number of the digital information and each input transfer. When a speed change occurs, a recording signal for recording invalid digital information is generated and reproduced for a certain period of time from the recording speed before the change is generated to the recording speed after the change is generated by the speed control means. At this time, the speed control means dynamically controls the reproduction speed by detecting the number of multiplexes and the output transfer speed information from the recording information separated from the reproduction signal selecting means and eliminating the invalid digital information and outputting the information. A digital information recording / reproducing apparatus characterized by: 6. 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, wherein a plurality of types of the digital information, the number of multiplexed digital information and each of the digital information are recorded. Recording information generation means for inputting control information including input transfer speed information, determining recording speed to the recording medium from the control information and generating recording information to the recording medium, and the determined recording speed or Speed control means for controlling the speed of the recording medium at a reproduction speed; 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 the recording signal recorded on the recording medium. From the recording signal, a plurality of types of the digital information and the reproduction information selecting means for separating the recording information and outputting each, and from the separated recording information The recording information generation means, and the reproduction information detection means for detecting the number of multiplexes and the output transfer speed information, and the multiplexing information storage means for storing the output transfer speed information detected and output from the reproduction information detection means. Generates the recording information according to the number of multiplexed digital information and a dynamic change of each input transfer rate information, and the recording signal generating means generates a recording signal including the recording information at any time, and at the time of reproduction. The number of multiplexes and the output transfer rate information are detected from the recording information separated from the reproduction signal selecting means, and the speed control means reads out the output transfer rate information stored until a predetermined time elapses. The digital information recording / reproducing apparatus is characterized in that the speed control means dynamically controls the reproducing speed. 7. The recording information generating means detects the occurrence of a change in the number of multiplexed digital information or each input transfer rate information and generates recording information having the changed contents, and the recording signal generating means is predetermined. 7. The digital information recording / reproducing apparatus according to claim 6, wherein a recording signal for changing the recording information at the recording position before the fixed time is generated and recorded at the recording position before the fixed time on the recording medium. 8. The output transfer rate information stored in the multiplexed information storage means and the current reproduction rate information detected by the reproduction information detecting means are referred to, and after a predetermined time elapses, 8. The digital information recording / reproducing apparatus according to claim 7, wherein the speed control means detects a current reproduction speed and generates a reproduction speed signal which matches the stored output transfer speed information.