JPH01205709A - Recording and/or reproducing device - Google Patents

Abstract

PURPOSE:To compensate the time difference between a reproducing signal and time cord data by making the position of a reproducing head for an information signal the same as or precedent to the position of a recording head for it and making the position of a recording head for the time code data precedent to the position of a reproducing head for them. CONSTITUTION:A recording head 1 and a reproducing head 2 to record and reproduce the information signal to a tape 101 are arranged on a rotary drum 3b and the position of the reproducing head 2 is set in a position the same as or precedent to the position of the recording head 1 in a transfer direction (t) of the tape 101. A time code recording head 4 to write the time code data related to the data of recording and reproducing onto the tape 101 is set in a position precedent to the position of a time code reproducing head 5 to read out the time code data. Thus, the time difference between the reproducing signal based on the information signal and the reproducing of the time code data can be compensated.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to a recording and/or reproducing apparatus for recording and/or reproducing information signals on a tape serving as a recording medium, such as a video tape recorder. Regarding.

B1 Summary of the Invention The present invention provides a recording and/or reproducing apparatus in which the reproducing head position of an information signal is set to the same or preceding position with respect to the recording head position with respect to the transport direction of a tape serving as a recording medium. By setting the recording head position for time code data related to this information signal to a position that precedes its playback head position, delays for signal processing etc. (so-called system delay) can be avoided when recording and/or reproducing the information signal. ), it is possible to simultaneously output the reproduction signal based on the information signal and reproduce the time code data corresponding to this information signal.

C1 Conventional technology Conventionally, a rotary head device consisting of a head for recording and reproducing data (information signals) and a rotary drum containing this head is provided, and a tape serving as a recording medium is moved to the rotary head device within a predetermined angular range. In addition to winding and transporting the
By rotating the rotating drum at a predetermined speed, the head slides into contact with the tape to record and reproduce data, such as a VTR (video tape recorder). The device is known.

In such a recording/reproducing apparatus, the sliding trajectory of the head on the tape is, as shown in FIG.
The trajectory is inclined at a predetermined angle. This sliding contact locus of the head becomes a data track To on which data such as a video signal is written, for example.

In addition, in this recording/playback device, the tape 10
1, a control track T on which a control signal for controlling the speed of transport of the tape 101 is written.
c and signals related to the data track TD, such as a time code track TT, in which time code data corresponding to an address signal is written. This control trunk T0 and Quimcoat truck T-r
are formed parallel to the transport direction of the tape 101 so that a predetermined signal can be written onto the tape 101 by a fixed head.

In this recording/reproducing device, as shown in Fig. 3,
Each head is arranged such that the distance between the position of the head 102 with respect to the tape +01 (for example, the writing start position of the data track T) and the fixed head 103 is a predetermined distance d. That is, the data and the time code data correspond to each other and are written on the tape 101 at intervals based on the predetermined interval d.

In the recording/reproducing apparatus configured in this way, the head 102 writes data to the data trunk T, and at the same time, the fixed head 103 writes the control signal and the time code data. . When the data is read by the head 102, time code data and control signals corresponding to the read data are sent to the fixed head 102.
Read by 03. Then, the transport speed of the tape 101 can be accurately controlled based on the read control signal, and the data track T can be controlled based on the time code data.

It is now possible to search for data at a predetermined address among the above data.

Further, as shown in FIG. 4, the head 102 is separated into a recording head 102* and a reproducing head 102P, and a recording head 1023 is a reproducing head 102P.
A device has been proposed that is arranged slightly in advance of the time code, so that the data to be written can be read out one by one, thereby enabling so-called monitor playback. There are no practical problems in the correspondence with the data.

D8 Problems to be Solved by the Invention Incidentally, in the above-mentioned recording/reproducing apparatus, a device such as a digital VTR has been proposed that uses digital data as the data written in the data track To.

In a recording/reproducing apparatus configured to write such digital data to the data track To, for example, the method described in Japanese Patent Laid-Open No. 62-115981 and Japanese Patent Laid-Open No. 62-199179 is available. As in the recording/playback device previously proposed by the applicant, when digital data is recorded on a tape as a recording medium, signal processing such as so-called interleave processing is performed to correct errors. is being carried out. Further, when reproducing digital data recorded in this manner, it is necessary to perform, for example, so-called deinterleaving processing to return the read data to the state before the above signal processing was applied.

Therefore, from the time the recording signal that becomes the digital data is supplied to this device until it is subjected to predetermined signal processing and written to the data track To, and the digital data written to the data track Tn is read out. It takes a predetermined time, ie, a system delay time, from when the data is processed to when the reproduced signal is obtained.

Therefore, in a recording/reproducing device that fills the data track To with digital data, if the digital data and the time code data corresponding to this digital data are written simultaneously, the digital data cannot be read. The reproduced signal obtained by outputting is delayed by a time corresponding to the system delay with respect to the time code data to be read out.

In order to compensate for the time difference between the reproduction signal based on digital data and the time code data, for example, as described in Japanese Patent Publication No. 5B-6205, the head 102 is connected to the recording head 102R and the reproduction head 102R. It is conceivable to separate the head 102p for reproduction and the head 102p for recording, and to make the head 102P for reproduction precede the head 102R for recording in the transport direction of the tape 101. That is, as shown in FIG. 5, when the system delay amount that occurs when recording digital data is DLL, and the system delay amount that occurs during playback is DL2, first, in order to compensate for the system delay D L t during recording, The recording head 102R is moved back by ADl from the position of the head 102 shown in FIG. 3 in the direction of transport of the tape 101 shown by arrow t in FIG. In the rotary head device, such movement of the head on the tape 101 can be performed by adjusting the height of the head in the axial direction with respect to the rotary drum. The retreating distance I A D + is calculated as ADl=υ・D L, where U is the transport speed of the tape 101.
Set it so that it is L. In order to compensate for the system delay DL2 during playback, the above-mentioned playback head 10 is
2p is advanced by A D 2 from the position of the head 102 shown in FIG. 3 in the direction opposite to the transport direction of the tape IO machine. This distance to advance, %I A D
2 is set so that AD2 = u-DL2, where the transport speed of the tape 101 is O. In this way, each of the above -・rad]0
By arranging 2R, 102P, and 103, a reproduction signal based on read data and time code data corresponding to the data are simultaneously output.

However, as the system delays 1tDL+ and DL2 occurring during recording and reproduction increase, the distance between the recording head 102R and the reproduction head 102F, that is, A D s + A D 2 increases. Then, these two heads 102R, I O
Since the height difference in the above-mentioned 2p rotary head device becomes large, it becomes impossible to arrange it in one rotary head device,
There is a problem that the device becomes complicated.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned circumstances, and is intended to be applied to a recording and/or reproducing apparatus such as a digital VTR that causes a system delay when recording and/or reproducing information signals. It is an object of the present invention to provide a recording/reproducing apparatus that can compensate for a time difference between a reproduction signal based on the information signal and time code data without complicating the information signal.

Means for Solving the E0 Problems In order to solve the above-mentioned problems and achieve the above objects, the recording and/or reproducing apparatus according to the present invention has a recording and/or reproducing apparatus in which the reproduction head position of the information signal is adjusted with respect to the transport direction of the tape serving as the recording medium. The recording head position for time code data related to the information signal is set to be the same as or in advance of the recording head position of the information signal, and the recording head position for the time code data regarding the information signal is set in advance of the playback head position. Features.

F1 Effect In the recording and/or reproducing apparatus according to the present invention, the recording head position for time code data is set in advance of the reproducing head position, so the read information signal is used as the reproduced signal. It is possible to compensate for the time difference between the reproduced signal and the reproduction of time code data corresponding to this signal, which is caused by the delay time required for signal processing (so-called system delay).

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

A recording and/or reproducing apparatus according to the present invention is an apparatus for recording and/or reproducing data (information signals) such as a video signal on a tape serving as a recording medium, and is shown in FIG. 1A. The recording head 1 has a recording head 1 for writing data onto the tape 101 and a reproducing head 2 for reading the data.

The recording head 1 and the reproducing head 2 are a rotary drum 3b.
is placed on top. The rotating drum 3b is rotatably supported between the upper fixed drum 3a and the lower fixed drum 3C coaxially with each of these fixed drums 3a and 3c, and constitutes the rotating head device 3. Note that, in FIG. 1A, the rotary head device 3 is shown with its outer peripheral surface unfolded.

Then, the tape 101 is spirally wound around the rotary head device 3 over a predetermined angular range shown by R in FIG. By transporting the tape in the direction indicated by the arrow t in FIG. Recording and playback are performed. The above data track To
As shown in FIG. 2, the tape 101 is formed with a predetermined inclination indicated by θ in FIG. 1A with respect to the transport direction of the tape 101.

This recording and/or reproducing apparatus also includes a time code recording head 4 that writes time code data related to the above data onto the time code track TT of the tape 101.
and a time code playback head 5 for reading out this time code data. The time code recording head 4 and the time code reproducing head 5 are fixed heads, and the time code track Tt is formed parallel to the transport direction of the tape 101, as shown in FIG.

Here, the reference data track T
o. This reference data track To is formed at a predetermined distance from the time code recording head 4. In FIGS. 1A and 1B, the scanning start position of the head on the reference data track To is defined as a reference point P, and this predetermined distance is defined as the distance between this reference point P and the time code recording head 4. The distance is shown as Mdo. In addition, in FIGS. 1A and 1B and the following explanation, when the head disposed on the rotary drum 3b is in a position to scan the reference data track To, the position of this head is the reference data track To. Assume that it is point P.

The recording head 1 is arranged so that the distance from the reference point P is AD in the direction of transport of the tape 101. The tape 1 of the recording head l as described above
In the rotary head device 3, the position adjustment in the transport direction on the recording head 1 can be performed by adjusting the height of the recording head 1 in the axial direction with respect to the rotary drum 3b. The distance A D+ is the delay time D required for signal processing in the signal processing circuit that supplies data to the recording pad 1.
Determined in relation to LI. That is, if the speed of transport of the tape 101 is υ, then AD+ = υ・DL
It is set to be I. Therefore, the distance between the recording head l and the time code recording head 4 is d.
o-ADZ, that is, do-υ・DLI.

Here, a recording signal and a time code signal corresponding to the recording signal are supplied to the recording signal input terminal DR and the time code signal input terminal Ca, respectively. Then, in the time code recording head 4, time code data is written in the time code track T7 at the same time as the time code signal is supplied. And the above recorded signal is
By performing predetermined signal processing by the signal processing circuit, the data is written to the data track To with a delay of the delay time DLI. During this delay time DLl,
Since the tape 101 has been transferred by u-DLt, the corresponding data and time code data are written on the tape 101 with the predetermined interval do apart.

Then, the playback head 2 is arranged such that the distance from the reference point P is (AD) in the direction opposite to the transport direction of the tape 101.
2 ADD), that is, they are arranged in advance. Similarly to the recording head 1, the position of the reproducing head 2 along the transport direction of the tape 101 can be adjusted by adjusting the height in the axial direction with respect to the rotary drum 3b.

Further, the time code reproducing head 5 is arranged so that the distance from the time code recording head 4 is ADa in the transport direction of the tape 101. Therefore, the playback head 2 and the time code playback head 5
The distance from is (AD2-AD3)+do+AD! That is, do+AD2.

By the way, the path M A D 2 is the reproducing head 2.
It is determined in relation to a delay time DL2 until the data read out is subjected to predetermined signal processing and output as a reproduced signal from the reproduced signal output terminal Dp. That is, AD2 = o-DL2, and the above path fMADs is
The above-mentioned path M A D 2 and the adjustable range of the height of the above-mentioned playback head 2 with respect to the above-mentioned rotating drum 3b (mechanical attachment is within the possible range, or the winding of the above-mentioned tape 101 around the above-mentioned rotating head device 3 is within a corner, etc. (the range up to which it becomes impossible to continue outputting data). That is, as shown in FIG. 2, the height is outside the adjustable range with respect to the rotating drum 3b. Therefore, the reproducing head 2 cannot be provided at this position. Therefore, the reproducing head 2 is disposed so as to be closest to the direction opposite to the transport direction (ie, the winding start side) within the adjustable range. This way you can actually play Rad2
The distance on the tape 101 between the position where is disposed and the position 1f2a is the distance AD3.

When reproducing the data and time code data recorded on the tape 101, the data is read by the reproducing head 2, and the time code data is read by the time code reproducing head 5. Ru.

When the playback head 2 continues to output the data,
As described above, the time code data corresponding to this read data is written on the tape at a position separated by the predetermined distance do. The distance between the reproduction head 2 and the time code reproduction head 5 is do+AD2, as described above. Therefore, at this time, the time code data corresponding to the successively outputted data is not read out by the time code reproducing head 5. Then, the successively outputted data is subjected to signal processing in the signal processing circuit, so that it is delayed by the delay time DL2 and is output as a reproduced signal from the reproduced signal output terminal Dp. At this time, the tape 1
01 has been moved by υ·DL2, that is, the distance AD2, time code data corresponding to the read data is read by the time code reproducing head 5 and output from the time code signal output terminal Cp. In this way, the corresponding reproduction signal and time code signal are simultaneously output to the reproduction signal output terminal Dp and the time code signal output terminal Cp.

By the way, in order to make the structure of the rotary head device 3 more cylindrical, when the recording head 1 and the reproducing head 2 are made into one common head, the distance A D a
For, A D s = A D + + A D t.

Therefore, the distance between the time code recording head 4 and the time code reproducing head 5 is A D , + A
It becomes D2. For example, in a digital VTR for so-called high-definition television, the transport speed υ of the tape 101 is 805w/aθC, and the delay time when reproducing the data corresponds to 2 frames, so the time code The distance between the recording head 4 and the time code reproducing head 5 is 53.7 mm. In other digital VTRs, the transfer speed υ is 28
6 trm/sec, and the delay time corresponds to 5/6 frames. In this case, the distance between the time code recording head 4 and the time code reproducing head 5 is 7.9 m. . In such a device, the two heads 4.5 can be configured as a so-called combination head.

Note that the recording and/or reproducing apparatus according to the present invention is not limited to one in which the recording head and reproducing head for writing and reading data are configured as rotary heads as in the above-mentioned embodiments, and these recording heads and reproducing heads are configured as rotary heads. The reproducing head may be a fixed head.

In this case, each head may be arranged in the same positional relationship as in the above embodiment, as shown in FIG. 1B.

Furthermore, the present invention is applicable not only to devices configured to perform both recording and playback, as in the above-described embodiments, but also to devices configured to perform only either recording or playback. can do.

H1 Effects of the Invention As described above, in the recording and/or reproducing apparatus according to the present invention, the recording head position for time code data is set in advance of the reproducing head position.

Therefore, the time difference between the reproduced signal and the time code data corresponding to this signal, which is caused by the delay time (system delay) required for signal processing to convert the read information signal into a reproduced signal, is calculated as time code data. This can be compensated for by adjusting the placement position of each head. Therefore, for example, photographing equipment, display equipment, editing equipment, etc. that supply signals to this device or are supplied with signals from this device, devices used for conventional devices that do not cause the above system delay should be used. It can be applied as is.

Moreover, each head for information signals can be arranged, for example, in one rotary head device, and the device configuration does not become complicated.

That is, by configuring a recording and/or reproducing apparatus such as a digital VTR that causes a system delay during recording and/or reproducing according to the present invention, it is possible to configure a recording and/or reproducing apparatus such as a digital VTR that generates a system delay during recording and/or reproducing, without complicating the apparatus configuration. It is possible to realize a recording and/or reproducing device in which the time difference of .

Furthermore, by making the arrangement position of each head for the time code data correspond to the delay time due to signal processing in each device, tape compatibility can be maintained between devices having different delay times.

[Brief explanation of the drawing]

FIG. 1A is a schematic diagram showing the positional relationship between the rotary head device and the tape, which are the main parts of the recording and/or reproducing apparatus according to the present invention, and FIG. FIG. 2 is a schematic diagram illustrating the positional relationship of heads in relation to FIG. 1A above. FIG. 2 is a schematic plan view showing the configuration of a recording track, a control track, and a time code track formed on a tape by the recording and/or reproducing apparatus according to the present invention and the conventional recording and reproducing apparatus. FIG. 3 is a schematic diagram showing the arrangement positional relationship of each head in the conventional recording/reproducing device, and FIG. 4 shows another example of the arrangement positional relationship of each head in the conventional recording/reproducing device. FIG. 5 is a schematic diagram showing an example of the arrangement positional relationship of each head when a so-called system delay occurs in a conventional recording/reproducing apparatus. 1... Recording head 2... Playback head 4... Time code recording head 5...
...To time code playback Nodo 101...
・Tape To・・・・・・Data track

Claims (1)

[Claims] With respect to the transport direction of the tape serving as a recording medium, the reproduction head position of an information signal is set to the same or preceding position with respect to the recording head position of that information signal, and the recording head position for time code data regarding that information signal is set. A recording and/or reproducing device which is set at a position preceding the position of the reproducing head.