JPS61204848A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To search automatically a program without malfunction by recording a program search signal and a phase control signal on an area of a divided track where no recording signal is recorded. CONSTITUTION:Program search control circuit F outputs a write signal, which sets a program search signal write switch 7 to the side of a contact b7, in response to the output of a program search signal generating switch SW3. The program search signal write switch 7 is set to the side of the contact b7 by this write signal, and only the program search signal is given to a mixing circuit 6A. That is, a PCM audio signal is not written when the program search signal is written, and it is made easy to detect the program search signal at the reproducing time. The program search signal ad the phase control signal are recorded on areas 31, 32, 33, 34 and 35 of a divided track 3Y and areas 51, 52, 53, and 54 of a divided track 5Y.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a helical scan type magnetic recording and reproducing device, and in particular, a device for recording and reproducing pulse code modulation signals and automatically cueing information recorded on a magnetic tape. This invention relates to an automatic cueing device that performs automatic cueing.

(Prior art) For example, in a conventional helical scan type magnetic recording and reproducing device, a so-called 8 mm video tape recorder,
As shown in FIG. 5(1), the magnetic tape T is placed on the roller L1.
．． For example, 221 around the rotating drum L via L2.
They are in contact and wrapped around each other. As shown in FIG. 5(2), the tracks 61 and 62 of the magnetic tape T include video signal recording areas b1 and b2, and PCM recording areas al and a for recording audio PCM signals obtained by pulse code modulating audio signals.
2 and 2 are installed respectively. The video signal area bl
, b2, as shown in FIG.
.

This is an area where a video signal is recorded by H2.

Further, the PCM recording areas at and a2 are shown in FIG. 5(1).
As shown in , this is the area where the magnetic tape T contacts the rotating drum 7 at 36 degrees and the audio signal is recorded.

The kick rack 63 shown in FIG. 5(2) is an area for recording a single frequency cue signal for cueing the recording signal recorded on the magnetic tape T, and is installed separately (not shown). The information is recorded and reproduced using a magnetic head.

On the other hand, in a conventional magnetic recording and reproducing apparatus that employs multi-PCM, as shown in FIG. A recording signal is recorded and reproduced in the divided divided tracks T1 to ]'6. Recording signals are recorded on the tracks TI-T6, for example, at intervals of 36 degrees. Each area af of the divided tracks T1 to T6 is shown in FIG.
), these are areas recorded corresponding to the rotational areas aO to rO of the rotating drum L, respectively. In addition, the cue signal (1, l, as shown in FIG. 6 (
The data is recorded and reproduced on a cue track 73 as shown in 2).

As shown in Figure 2 below, the conventional magnetic recording/reproducing device has cue tracks 63 and 73 dedicated to cueing on the magnetic tape T.
is used to cue the recording signal.

However, in the case of the conventional example having such a configuration, it is necessary to separately install a dedicated magnetic head for recording and reproducing the cue signal, which makes the configuration complicated and causes problems in the magnetic tape running operation. have a negative impact on the
Providing such a magnetic head has drawbacks such as increased cost.

(Object of the Invention) The present invention has been made in view of the above circumstances, and is capable of locating the cue of a recording signal recorded on a magnetic tape without using a dedicated magnetic head for recording and reproducing cue signals. The purpose of the present invention is to provide a magnetic recording/reproducing device that can automatically and reliably perform the following steps.

(Structure of the Invention) In order to achieve such an object, the present invention records a recording signal on a magnetic tape by helical scanning the magnetic tape, and also includes a rotary head for reproducing and outputting the recording signal. On the magnetic tape, among the first to nth divided tracks formed by dividing each scanning track of the three rotary heads into n, each scanning track has an nth divided track (where 1 is 1). (any number between n)
The same kind of information signal is applied to each other, and in response to a first control signal, a recording signal is applied to record on the n-th divided track corresponding to the first control signal, and the recording signal is applied to the unrecorded first track. recording signal output means for supplying the rotary head with a cueing signal and a phase control signal to be recorded in the divided track areas; a signal processing means for processing the playback output from the rotary head; and a cueing signal from the playback output. filter means for extracting the reproduction output; selection means for selecting the reproduction output in response to a gate pulse signal and applying it to the processing means, filter means and phase control signal extraction means; and selection means for selecting a first divided rack to be recorded and reproduced. gate pulse generating means for outputting a pulse signal to the game 1 in response to a second control signal for outputting the first control signal to the recording signal output means and for selecting the divided track; outputting the second control signal in response to a dividing rack setting signal set to a divided track on which the cuing signal is recorded based on the cuing signal extracted by the filter means; a third control that counts the number of jumps in the scanning track corresponding to the scan track, and when this count value reaches a predetermined count number, reproduces the recorded signal from the divided track onwards on which the cue signal is recorded; a first control means for outputting a signal; and a second control means for controlling automatic regeneration in response to the third control signal and controlling rotation of the capstan 1 motor in response to the phase control signal. I'm trying to prepare.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 1 is a block diagram according to an embodiment of the present invention.

The present invention records recording signals on the magnetic tape by helical scanning the magnetic tape, and also includes rotating edges 1 and 2 for reproducing and outputting the recorded signals, and rotating edges on the magnetic tape. Each scan of the head 1.2) - Of the 1st to 11th divided trunks formed by dividing the rack into n, each scanning track (3 i-th divided track (where i is 1 to n) An arbitrary number) are given the same type of information signal, and a recording signal to be recorded in the first divided one square corresponding to the first control signal in response to the first control signal, and the recording signal is No record of said 1st
Recording signal output as a recording signal output means for supplying a cue signal and a phase control signal to be recorded in the divided track area to the rotary head 2, and also supplying a phase control signal to the rotary head 1 together with the recording signal. Load the means.

Further, the present invention provides a signal processing circuit B which is a signal processing means for processing the reproduction output from the rotary head 1.2.
, a filter circuit C as a filter means for extracting a cue signal from the reproduction output, and a processing circuit B1 for selecting the reproduction output in response to a gate pulse signal.
As a gate pulse generating means for outputting the gate pulse signal in response to a selection means applied to the filter circuit C and the phase control signal extraction circuit J, and a second control signal for selecting the i-th divided track to be recorded and reproduced. a gate pulse generation circuit E, and outputs the first control signal to the recording signal output circuit A, and outputs the first control signal as the second control signal in response to a divided track setting signal set for selecting the divided track. Also, based on the cue signal extracted by the filter circuit C, the number of skips of the scanning track corresponding to the divided track in which the cue signal is recorded is counted. When the merit value reaches the predetermined count number,
A cueing control circuit F as a first control means outputting a playback operation start signal (third control signal) for reproducing recorded signals from the divided track onwards where the cueing signal is recorded.
and a Noste 13 control circuit G as a second control means that performs an automatic regeneration control operation in response to the regeneration operation start signal and controls the rotation of the capsun motor I in response to the phase control signal. .

Next, the cueing operation in this embodiment will be explained with reference to FIGS. 2 to 4. As shown in FIG. Divided tracks IY, 2Y, 3Y, 4 Y, 5Y, 6Y are formed by dividing each of the scanning tracks IX, 2X, and 3X of .2 into six, respectively.
Now, as shown in Figure 2, the audio PCM signal is recorded on the magnetic tape T'2 track 3Y.
For example, 1.7 M
A case will be described in which the cueing signal and phase control signal of a single frequency of I(z) are recorded, and the cueing of the audio P and CM signal is performed.

During recording, the recording/reproducing changeover switches 4a and 4b included in the selection means are set to the REC side. First, the audio PCM signal to be recorded is amplified by the recording amplifier 5, and one of the amplified outputs is given to the mixing circuit 6B and mixed with a phase control signal prepared in advance by the servo circuit 11. The mixed signal is recorded by the rotating head 1 of the B channel. Further, the other amplifying horn is applied to the mixing circuit 6A via the cue signal writing switch 7.

The cue control circuit F provides a track selection signal to the gate pulse generation circuit E in response to the output of a track number setting switch SWI which selects and sets predetermined divided track numbers on the magnetic tape T-.

As a result, the divided tracks 1Y to 6Y are designated. Further, the cueing control circuit I2 determines the number of times the cueing signal recorded in the rack is received for the selected division 1, that is, the division in which the cueing signal is recorded. Sets the value of the number of scanned track jumps corresponding to the track. Further, the cue control circuit F outputs a write signal for setting the cue signal writing switch 7 to the contact b7 side in response to the output of the cue signal generation switch SW3. In response to this write signal, the cue signal write switch 7 is set to the contact h7 side, and only the cue signal 111 is given to the mixing circuit 6A. That is, when writing the cue signal, the PCM audio signal is not written, so that the cue signal can be easily detected during playback.

The mixing circuit 6A mixes the cue signal and the phase control signal. Note that the frequency of the cue signal is considerably higher than that of the phase control signal. The output of the mixing circuit 6Δ is sent to the rotary head 2 of channel A.
recorded by.

This rotary head 2 performs a switching operation in response to a gate pulse signal from the gate pulse generating circuit E. The track number and the number of skips are displayed on the display 14 based on the track selection signal from the cue control circuit F and the number of skips signal.

As a result of this operation, the rotary head 2 is located in the area 31, 32.33° 34.35 of the divided track 3Y and the area 51, 52° 53.54 of the divided track 5Y as shown in FIG. The cue signal and phase control signal are respectively recorded.

Next, the operation during playback for cueing will be described. During this reproduction, the recording/reproducing changeover switches 4a and 4b are set to the contact FB side. This cueing causes the magnetic tape T to run at high speed. Therefore, the scanning tracks AI, A2 and B of said rotary heads 2 and 1 at high speeds
1 and B2 are as shown in FIG. Here, for example, the area 31 of the divided track 3Y as shown in FIG.
, 32.33°34.35 Figure 3 (2
) The case where the cue signal p3 as shown in FIG.

The gate pulse generating circuit E responds to a head switching pulse signal of 30 Hz as shown in FIG. 3(1), which is a rotation signal of a rotating drum (not shown), to generate a signal as shown in FIG. 3(3).
A gate pulse signal p as shown in is output. The head changeover switches 3a, 3b switch the rotary head 1.2 in response to the data pulse signal p. Therefore, areas 31, 32, 33 of the divided track 3Y
, 34.35 are reproduced by the rotary head 2 and sent to the bandpass filter circuit 10 included in the filter circuit C via the reproduction amplifier 9. The bandpass filter circuit 10 outputs the cue signal p3 and the output cue output is detected by the detection circuit 11 and outputs the cue signal p4 as shown in FIG. 3(4).

In addition, as shown in FIG. 2, the area 51 of the divided track 5Y
．． Even if a cue signal p5 as shown in FIG. 3(2) is recorded in 52, 53, and 54, it is not extracted by the head gate pulse signal p.

A phase control signal extraction circuit (2) extracts the phase control signal from the output of the reproducing amplifier 8.9 and supplies it to the system control circuit G. As a result, the system control circuit G operates the servo circuit 1 and performs control to keep the rotation of the capstan motor I constant.

Here, the operation of the cue control circuit F will be explained with reference to the flowchart shown in FIG. In step n2, it is determined whether the cueing signal is a manual saw or not, and when it is input, the process moves to step n3, where a numerical value l is subtracted from the jump count value displayed on the display 14. In step n4, the display on the display 14 is changed, that is, the subtracted numerical value is displayed. In step n5, the display device 1
It is determined whether the displayed numerical value of 4 has become 0 or not, and when the numerical value has become 0, the process moves to step n7 and a reproduction operation start signal is given to the system control circuit G. Accordingly, the system control circuit G controls the mechanism to perform the reproducing operation.

Incidentally, the system control circuit G is for controlling the entire magnetic recording/reproducing apparatus of the present invention.

Incidentally, in step n5, if the numerical value displayed on the display I4 is not 0, the process moves to step n6, this processing operation is delayed, and the process returns to step 112. This delay is because the cueing signal is written for a predetermined period of time, so that a prohibition time is added so that the cueing signal can be input as one cueing signal within the predetermined time range.

This unidirectional operation performs cueing, and the magnetic tape T returns from high-speed running to normal running speed, and begins a reproducing operation. Therefore, the sound P reproduced by the rotary head 1.2
The CM signal is demodulated by the signal processing circuit B, and is given to an audio circuit (not shown) as an analog audio signal.

In this embodiment, the cueing signal is recorded and reproduced by the rotary head 2, but it may be configured so that it can be recorded and reproduced by the other rotary head 1.

(Effects of the Invention) As described in ``2'' below, according to the present invention, by recording the cue signal and the phase control signal in the divided track area where no recording signal is recorded, the cue signal can be used for high-speed playback operation. This makes it easier to extract data, and it is possible to reliably cue automatically. Therefore, cueing can be performed automatically without any malfunction, resulting in improved functionality.

[Brief explanation of the drawing]

FIG. 1 is a program diagram of an embodiment of the present invention, FIG. 2 is a front view of a magnetic tape for explaining the cueing operation of the embodiment, and FIG. 3 is a diagram for explaining the cueing operation. Timing chart, Figure 4 is a rounded flowchart explaining the cueing operation, Figure 5 (1) is a block diagram of the vicinity of the rotating drum of a conventional 8 mm video tape recorder, Figure 5 (2)
6 is a front view of the magnetic tape in the 8 mm video tape recorder, FIG. 6 (1) is a block diagram of the area around the rotating drum of a conventional multi-PCM video tape recorder, and FIG. 6 (2) is a front view of the magnetic tape in the 8 mm video tape recorder. FIG. 3 is a front view of the magnetic tape. 1.2... Rotating head, A... Recording signal output circuit (recording signal output means), B... Signal processing circuit (signal processing means), C... Filter circuit (filtering means), D Selection means, E. Gate pulse generation circuit (gate pulse generation means), F cueing control circuit (first control means), G. System control circuit (second control means), I (servo circuit, ■
・Capstan motor 1, 1 Phase control signal extraction circuit (phase control signal extraction means), T ・Magnetic tape, ]X~
3X/scanning track, IY~6Y...divided track.

Claims (1)

[Claims] (1) A rotary head that records recording signals on the magnetic tape by helical scanning the magnetic tape and reproduces and outputs the recorded signals; and a rotary head that divides each scanning track of the rotary head on the magnetic tape into n parts. Among the first to n-th divided tracks, the i-th divided track (where i is any number from 1 to n) in each scanning track is provided with the same type of information signal, and the first control signal is In response, a recording signal to be recorded on the i-th divided track corresponding to the first control signal is given, and the recording signal sends a cue signal and a phase control signal to be recorded in the unrecorded i-th divided track area. A recording signal output means to be applied to the rotary head, a signal processing means for processing the playback output from the rotary head, a filter means for extracting a cue signal from the playback output, and a phase control signal from the playback output. a phase control signal extraction means for extracting a phase control signal; a selection means for selecting the reproduction output in response to a gate pulse signal and applying it to the processing means, filter means, and phase control signal extraction means; and an i-th divided track to be recorded and reproduced. Second to select
gate pulse generation means for outputting the gate pulse signal in response to a control signal; and a divided track setting signal configured to output the first control signal to the recording signal output means and to select the divided track. outputting the second control signal in response to the cueing signal, and counting the number of skips of the scanning track corresponding to the divided track in which the cueing signal is recorded based on the cueing signal extracted by the filter means. and a first control means for outputting, when the count value reaches a predetermined count number, a third control signal for reproducing recorded signals from the divided track onwards in which the cue signal is recorded; A magnetic recording and reproducing apparatus comprising: second control means for controlling automatic reproduction in response to a control signal and controlling rotation of a capstan motor in response to the phase control signal.