JPH0460967A - Rotary head type recording and reproducing device - Google Patents

Abstract

PURPOSE:To set versatile search modes in simple constitution by setting plural inclined tracks in accordance with a tape moving speed under a search mode as a unit, dividing these plural inclined tracks into >= 1 in each unit and recording a different kind of index signal to each divided section respectively. CONSTITUTION:As to the index signals, the device possesses a time code data generating circuit 18, a program number data generating circuit 19 and a mark signal data generating circuit 20. Then, plural inclined tracks in accordance with a tape moving speed by a frequency dividing circuit (1/9 frequency divider) 48 under the search mode are set as a unit, and the plural inclined tracks are divided into >= 1 in each unit, where different index signals by the circuits 18-20 are recorded in these divided sections respectively, and these records are repeated unit by unit by a shift register 26. By this method, versatile search modes are set in simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head type recording/reproducing device applied to, for example, a consumer high-definition VTR.

(Summary of the Invention) The present invention relates to a rotary head type recording/reproducing device, and the present invention relates to a rotary head type recording/reproducing device, in which a plurality of inclined tracks are set as a unit according to the transport speed of the tape at the time of recording.
By dividing the rack into one or more sections and recording different types of index signals for each section, various search modes can be set with a simple configuration.

[Conventional technology]

For example, in high-definition V'lR for consumer use, it has been proposed to provide an index signal that is recorded and reproduced by a rotary head to enable high-speed retrieval.

In this case, as a recording format of such an index signal, for example, the one shown in FIG. 5 is known. In other words, the figure shows the recording format of the index signal used in the so-called 8mm V'FR.
．． The entire length corresponding to 5H (1-1 is the horizontal period) is “1”.
A run-in section is provided which is formed by the data of ``, and following this, the period of
~6 and an end court are provided. Furthermore, one of these data blocks is configured as shown in Figure B, and this data block is composed entirely of 51-bit data, and the three hits at the start end are used as a header, followed by 8 bits each. words 0 to 4 and an error correction code (CRCC) are provided.

This word 1-0 represents the type of data of the following words 1-1 to 4, and if this is a time code, the subsequent words N to 4 represent the data for hours, minutes, seconds, and frames, respectively. digitized and recorded.

Therefore, for example, specify an arbitrary time code, detect the above data while transporting the tape at high speed, and stop transporting the tape when the time code of this detected data matches the specified Quimco). By doing so, it is possible to perform a high-speed search using a so-called time code.

[Problems to be Solved by the Invention] However, when performing such a high-speed search, the search method is not limited to the above-mentioned time code. That is, various search modes are possible, such as a method using a program number that is updated for each recorded program, and a method that performs a search using an arbitrary mark signal. Therefore, even in the above format, program numbers and mark signals can be recorded according to the user's request, and in that case, the data in word O is changed according to the recorded contents. There is.

However, in that case, in order to perform a search using mark signals, for example, it is necessary to rewrite all of the above-mentioned index signals to use mark signals.

In other words, for example, when performing a high-speed search at N times the speed, only one track out of N is played back, and the (
N-1) Tracks are not played during the search. Therefore, for example, when performing a search using a mark signal, this mark signal must be provided continuously for N or more tracks.
For example, even if the time code was recorded in advance,
Recording of mark signals causes N or more tracks to be missing in succession, and there is a great possibility that this will interfere with subsequent time codes. Furthermore, when time codes are missing continuously in this way, it becomes difficult to restore them by interpolation.

For this reason, conventionally, as described above, the entire index signal has been rewritten for the mark signal. Therefore, for example, it is difficult to perform a search using both the above-mentioned time code and mark signal, and it is also not easy to change the search mode.

Although it is possible to record program numbers and mark signals in some of the data blocks 1 to 6 mentioned above, data blocks 1.2 are not sufficient to stably detect signals during high-speed searches, and especially Since the time code uses a majority vote based on three or more pieces of data to prevent false detection, it has been difficult to handle this with some data blocks. Furthermore, this method also makes it impossible to rewrite only the mark signal, for example.

By the way, the relationship between the inclined track and the scanning locus of the head in, for example, a 9x speed search is shown in FIG. Here, if the index signal is provided at the beginning of the track and a servo is applied so that the azimuth angle of the head matches at this beginning, the detected index signal will be in the shaded area, and for example, in the state shown in the figure. The tracks to be played back are as shown in Table A of FIG.

On the other hand, if the servo position of the head is off by two tracks, the played tracks will be in the combinations shown in Figure B. Similarly, with a 9x speed hammer, a total of five combinations are possible. becomes.

The present application utilizes the characteristics of the case where the search speed ratio is fixed in this way.

This application has been made in view of these points, and is intended to enable setting of various search modes with a simple configuration.

[Means for Solving the Problems] The present invention provides a rotary hand type recording and reproducing apparatus in which information signals and index signals are recorded on a tape by sequentially forming inclined tracks. The plurality of inclined tracks corresponding to the tape transport speed (frequency dividing circuit (48)) are divided into one or more units for each unit, and each of these sections is divided into different types. This is a rotary head type recording and reproducing device in which the index signals (generating circuits (18) to (20)) are recorded, and these recordings are repeated for each unit (shift register (26)).

[Effect]

According to this, a plurality of inclined tracks are divided into one or more sections according to the tape transport speed in the search mode, and different types of index signals are recorded for each section. You can set various search modes in the configuration.

〔Example〕

In FIG. 1, a video signal supplied to an input terminal (1) is supplied to a switch means (3) through a video processing circuit (2) including time-base compression. Further, for example, the first PCM audio signal supplied to the two-channel human horn terminal (4) is supplied to the switch means (6) through the first audio processing circuit (5) including time axis compression. Further, for example, a second PCM audio signal supplied to the two-channel input terminal (7) is supplied to the switch means (9) through a second audio processing circuit (8) including time-base compression.

The signals from these switch means (3), (6), and (9) are supplied to the heads A and B on the rotating drum (12) through the recording amplifier 10) and the changeover switch (11), and the signals around the drum (12) are supplied to the heads A and B on the rotating drum (12). Recording is carried out on a tape T wound around the tape T so as to form an inclined I-rack.

On the other hand, the rotating drum (12) is rotated by a drive motor (13), and this motor (13) is synchronized with the input video signal by a servo circuit (14) to which signals from the processing circuit (2) are supplied. be driven. At the same time, this drive motor (1
3) Pulse generator (PC) for detecting rotational phase
(15) is provided, and the signal from this P G (15) is supplied to a waveform shaping circuit (16),
A signal is formed that is inverted every half a rotation of the rotor, and the selector switch (11) is switched using this signal.

Furthermore, the signal from this waveform shaping circuit (16) is supplied to the timing generation circuit (17), and signals corresponding to the recording areas of each video signal and the first and second audio signals are formed, and these signals are The selection (conduction) of the switch means (3), (6), and (9) is performed.

Further, (18) is a data generation circuit for a time code as an index signal, (19) is a data generation circuit for a program number, and (20) is a data generation circuit for a mark signal. ) respectively switch means (21) (22) (23)
is supplied to the switch means (24) through. This switch means (24) is connected to the timing generation circuit (17).
) is selected, for example, by a signal corresponding to a guard portion between the recording area of the video signal and the first audio signal. Furthermore, the signal corresponding to this guard section is divided by three by a frequency dividing circuit (25) and supplied to a shift register (26), and the signal from this shift register (26) is used to control the switching means (21) to
(23) are selected in sequence.

Furthermore, (27) is a capstan for transporting the tape T, and the drive motor (27) of this capstan (27) is
28) is a frequency generator (FG) for detecting the rotation speed.
) (29), the signal from this FC (29) is supplied to the servo circuit (31) through the changeover switch (30), and the signal from this servo circuit (31) is supplied to the motor through the adder (32). (28) is supplied to the drive circuit (33). As a result, the tape T is transferred at a constant speed.

Therefore, in this apparatus, an inclined track is formed on the tape T with a recording pattern as shown in FIG. As shown, various index signals are recorded on three tracks each.

When further reproduction is to be performed, first, in normal reproduction, the tape T is transported at a constant speed as described above, and the drive motor (13) is operated at a constant speed by the servo circuit (14).

As a result, the signals reproduced by heads A and B are supplied to the reproduction amplifier (34) through the changeover switch (11).

The signal from this reproduction amplifier (34) is transmitted to the switch means (3).
5) to a video processing circuit (36) including time axis expansion, and the video signal processed here is sent to an output terminal (37).
) is output. Further, the signal from the amplifier (34) is supplied through the switch means (38) to a first audio processing circuit (39) including time axis expansion, and the two-channel first PCM audio signal processed here is outputted to the output terminal. (40) is output. Further, the signal from the amplifier (34) is supplied through the switch means (41) to a second audio processing circuit (42) including time axis expansion, and the second PCM audio signal of two channels processed here is outputted to the output terminal. (43) is output. The selection (conduction) of the switch means (35) (38) (old) is controlled by a signal from the timing generation circuit (17).

Also, for example, a viroft signal detected by the video processing circuit (36) is supplied to the servo circuit (31) and
tracking correction is performed.

Furthermore, the signal from the amplifier (34) is controlled by the signal from the timing generation circuit (17).
) is supplied to the index signal detection circuit (45), and the index signal detected here is sent to the interpolation circuit (45).
46) to the display section (47).

Note that the interpolation circuit (46) is supplied with a signal from the waveform shaping circuit (16) to perform interpolation.

On the other hand, during high-speed search, selector switch (30)
is switched in the opposite direction to the diagram, and the signal from the FC (29) is divided by 9 by the frequency divider circuit (48) and sent to the servo circuit (31).
supplied to As a result, the drive motor (28) is driven at nine times the normal speed, and the tape T is transported at nine times the normal speed. At the same time, the switch means (49) is turned on and a predetermined alternating signal from the signal source (50) is sent to the adder (32).
The signal is superimposed on the drive signal of the motor (28), and a predetermined meandering is added to the tracking of the heads A and B. This ensures that the index signal of each track is detected.

Regarding the effect of the signal source (50), see Japanese Patent Application Laid-open No. 62-26.
It is detailed in the 684 publication.

As a result, the index signal is detected by the detection circuit (45). This index signal is supplied to, for example, a system control circuit (51) and compared with a value set in this system control circuit (51).
The reversal, stop, etc. of transport of the tape T are controlled so that these coincide.

Further, when the index signal detected by the detection circuit (45) is not the desired one, the head A,
A drive signal that advances or lags the trunking of B by 2 to 4 h is sent to the motor (28) through the adder (32).
control is performed so that a desired index signal is obtained.

That is, for example, tracking is performed during high-speed sana as shown in FIG.
If, for example, a time code is detected from the track [5], [14], etc., the index signals of tracks [5], [14], etc. are detected as shown in FIG. You can search using .

In this manner, according to the above-mentioned apparatus, each of the plurality of slopes of 1 to 100 degrees corresponding to the transport speed of the tape in the search mode is divided into one or more sections, and a different type of index signal is recorded for each of these sections. By this,
With a simple configuration, various search modes can be set.

Note that in the above-described apparatus, the speed ratio of the high-speed search is not limited to 9 times. Here, the speed ratio is N, the number of types of index signals is m, and the number of I/racks in which one type of index signal is recorded! Then, N = m x l! becomes. The above example is a case where N=9, m=3, and ff1=3. Therefore, in principle, β-1 is acceptable, but in order to be able to detect even if the tracking is slightly off due to fluctuations in the tape transport speed, etc. It is better to have more than one.

Furthermore, if the order of the types of index signals is determined, the drive signal that advances or lags the tracking from the above-mentioned detection circuit (45) is used to detect the difference between the currently detected signal and the target signal. Control can be performed by forming positive and negative drive signals proportional to the difference depending on the direction.

[Effects of the Invention] According to the present invention, each of the plurality of inclined tracks is divided into one or two sections according to the tape transport speed in the search mode, and each of these sections is assigned a different type of index signal. By recording the information, it is now possible to set various search modes with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of a rotary head type recording/reproducing device according to the present invention, FIG. 2 is a diagram showing its recording pattern, and FIG.
The figure is a diagram showing an example of an index signal to be recorded.
M is a line diagram showing the search process, Figure 5 is a line diagram showing the format of the index signal, Figure 6 is a line diagram showing the search process, and Figure 7 explains changes in tracks played during search. It is a line diagram. (+) (4) (7) is the input terminal, (2) (5)
(8) is a signal processing circuit, (3) (6) (9) (21)
(22) (23) (24) (35) (38)
(41) (44) (49) are switch means, (1
0) is the recording amplifier, (1, 1) (30) is the changeover switch, (12) is the rotating drum, (13) (28) is the drive motor, (1, 4) (31) is the servo circuit, (15) is a pulse generator, (16) is a waveform shaping circuit, (17) is a timing generation circuit, (1B) is a data generation circuit for time coat' as an index signal, (19) is a data generation circuit for program number, (20) ) is a mark signal data generation circuit, (25) (48) is a frequency dividing circuit, (
26) is a shift register, (27) is a capstan, (
29) is a frequency generator, (32) is an adder, (33) is a drive amplifier, (34) is a regeneration amplifier, (36) (39)
) (42) is a reproduction processing circuit, (37) (40) (4
3) is an output terminal, (45) is an index signal detection circuit, (46) is an interpolation circuit, (47) is a display, (50) is a signal source, and (51) is a system control circuit. Q person Hidemori Matsukuma)

Claims (1)

[Scope of Claims] A rotary head type recording/reproducing device in which information signals and index signals are recorded sequentially on a tape by forming inclined tracks, wherein a plurality of information signals and index signals are recorded in accordance with the transport speed of the tape in a search mode. The plurality of inclined tracks are divided into one or more sections for each unit, and different types of index signals are recorded for each section, and these recordings are repeated for each unit. A rotating head type recording and reproducing device designed to allow