JPS61292252A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record a continuous identification signal by providing a means reproducing a section just before consecutive recording and a means decoding an identification signal during the reproduction mode and recording newly the identification signal after the end of reproducing state in response to the decoded identification signal. CONSTITUTION:When an Rec Key is received by a system control circuit 17 at a time t1, the tape is wound up to a time t2 and stopped until a time t3 and then wound forward, the Play mode is attained until a time t4 and a reproducing output from a head 10 is led to an identification signal processing circuit 16 via a sound signal processing circuit 3. The system control circuit 17 decodes a data such as elapsed time from the start of the tape recorded at a region before the start of consecutive pickup and a program number, and an ID signal in response to the data is transferred to an identification signal processing circuit 16. A recording current flows from the time t4 and a data set newly is recorded to the region after l2, l3.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a magnetic recording/reproducing device, and particularly to recording of an identification signal when the information signal to be recorded/reproduced is composed of a digitized audio signal and an identification signal. The present invention relates to a magnetic recording/reproducing device.

(Prior Art) A method of converting an analog audio signal into a digital signal and recording and reproducing the same has recently been widely practiced because it allows high-quality audio signals to be recorded and reproduced. For example, in the 8mm video standard as shown in Figure 2, the amount of tape wrapped around a cylinder with a built-in rotating head is increased by approximately 180 degrees, as well as the audio signal converted into a digital signal (hereinafter referred to as Approximately 36 to record PCM signal)
This is achieved by wrapping as many times as possible.

For 8mm videos that can record an identification signal together with the digitized audio signal, various information such as the program number and the elapsed time from the beginning of the tape can be stored in this identification signal section. It is convenient to record it, and for 8mm video, it is determined as follows.

In 8 mm video, each track has 6 bytes of identification signals, and each byte is given a name from IDO to ID5, with ID5 being determined as a common identification signal as shown in FIG. IDO is also used as an inspection code, and up to now six codes have been determined, some of which are shown in FIG.

(Problems to be Solved by the Invention) However, when performing continuous shooting in a magnetic recording/reproducing device such as an 8 mm video that can also record the identification signal described above, there is no effective method for recording the identification signal. There wasn't. That is, when performing continuous shooting, when recording the elapsed time from the beginning of the tape as an identification signal, it is convenient to record a time that is continuous with the recorded elapsed time before the start of recording.

(If the NTSC system is used, 1 track is recorded every 60 tracks.
The elapsed time obtained by adding seconds is added as an identification signal.

) Also, when recording the program number, it is often convenient for high-speed searches, cueing, etc. to record the value obtained by adding 1 to the previous program number.

In view of the above, an object of the present invention is to provide an apparatus equipped with an effective identification signal recording means when performing continuous shooting.

(Means for Solving the Problems) The present invention provides a means for reproducing the section immediately before continuous recording, and an identification signal is explained during the reproduction mode, and a new identification signal is generated in accordance with the explained identification signal. and a means for recording after the end of the reproduction state.

(Function) With the above-described configuration, the present invention decodes the recorded identification signal before the start of recording, and continuously adds a new identification signal to the tape in accordance with the decoded identification signal when performing continuous shooting. Since the tape is recorded upward, continuous identification signals can be recorded, which is very convenient for high-speed tape searches and cueing.

(Example) Before detailed explanation of the present invention, five P
An overview of CM audio recording will be explained using an 8 mm video method as an example with reference to FIG. In the figure, an audio signal input from a terminal 1 is converted into a 10-bit digital signal by a converter 2 which operates as an AD converter, and further compressed to 8 bits. The audio signal converted into a digital signal is guided to the audio signal processing circuit 3, and the identification signal processing circuit 1
The identification signal generated in step 6 is added. An error correction code is added to the audio signal to which this identification signal has been added, and the resultant signal is temporarily stored in random access memories 4 and 5 alternately every 1760 seconds, for example.
The information stored in 5 is read out alternately at high speed, and after modulation suitable for recording is performed, the information is led to a switch circuit 7. In the switch circuit 7, the video signal input from the terminal 6 and the FM
The mixed signal ([X) with the PCP4 signal and the PCP4 signal are temporally switched, and are connected to the pilot signal led from the terminal 9 through the recording amplifier 8 and then through the recording/reproduction changeover switch (SW). The information is guided to a magnetic head 10 and recorded on a magnetic tape. During reproduction, a signal generated by the head 10 is guided to the head switch circuit 12 through the preamplifier 11. One of the outputs of the head switch circuit 12 is taken out from a terminal 13 for a video signal, an FM audio signal, and a pilot signal, and the other is a demodulation circuit 1 for a PCM signal.
4 and is returned to the original PCM signal. Then, after being guided to the audio signal processing circuit 3 again and subjected to error correction, it is again stored alternately in the random access memories 4 and 5.
Data stored in the random access memories 4 and 5 is read out using the reference clock, and guided to the converter 2 which operates as a DA converter, and a demodulated reproduced audio signal is obtained from the terminal 15.

Similarly, the identification signal is also guided to the identification signal processing circuit 16, the identification signal is decoded, the decoded control data is guided to the system control circuit 17 as necessary, and the system control circuit 17 performs the necessary processing. Here, the converter 2 is shown as an An converter and an OA converter that switch between recording and playback, and the signal processing circuit also switches between recording and playback. Accordingly, signals can be recorded on a tape as shown in FIG. 2, but the position at which a signal is recorded on the tape is determined based on the pulse indicating the rotational phase of the rotary head.

Next, an example of an identification signal (referred to as an ID signal) will be explained with reference to FIG. 8mm video PCH as ID signal
The data is 6 bytes as shown below. IDO is an inspection code named mode number (in the case of Figure 4, mode 5 is shown), ID5 is the control named earlier shown in Figure 3, and it is a stereo signal or a monaural signal. It is designed to record whether the signal is an audio signal or other signal. A program number is recorded in the IDI, and numbers from 1 to 99 can be recorded. ID2, ID3, and ID4 indicate the elapsed time from the beginning of the tape.
"1 minute" data is recorded in ID4, and data "1 second" is recorded in ID4.

Next, an identification signal recording means according to an embodiment of the present invention will be explained. FIG. 1 is an electrical block diagram of the first embodiment, and FIG. 6 is a diagram showing the input/output timing of the system control circuit 17 of the first embodiment. In FIG. 1, 18, 19, and 20 are data latches, and 21 is a timer, which is composed of a second counter 24, a minute counter 231, and an hour counter 22.

These data latches 18 to 20, timer 21, etc. are connected to the system control circuit 17 through a data bus and a control bus. (The data bus and control bus are shown by one line.) In other words, when recording, the latch 18
is the mode number to be recorded in IDO, latch 19 is the program number to be recorded in IDI, and latch 20 is the program number to be recorded in IDI.
The control data to be recorded in ID5 is temporarily stored. Initial data can also be set for each counter of the timer 21 by the system control circuit 17. Further, 25 is an oscillator and a frequency divider, which generates a pulse every second. A pulse gate circuit 26 is provided to prevent the pulse from the oscillator/divider 25 from passing through, for example, when the tape is stopped. A data transfer controller 27 performs processing between the identification signal processing circuit 16 and the audio signal processing circuit 3 (FIG. 5). That is,
The data of the latches 18 to 20, the second counter 245, the minute counter 23, and the hour counter 22 are sequentially read out and supplied to the audio signal processing circuit 3 during recording. During playback, data sent from the audio signal processing circuit 3 is separated and set in respective latches and counters, and the system control circuit 17 takes in the data as necessary. Although it is not necessary to explain in detail, the above operations can be easily performed by using programmer counters as the counters 22 to 24. That is,
At the time of recording, initial data is set using playback data, and thereafter, the count is sequentially counted up using pulses every second that are inputted via the pulse gate 26.

The data may be sent to the data transfer controller 27, or input to the counters 22-24 may be prohibited during reproduction, and the reproduced data sent from the data transfer controller 27 may be set in the counters 22-24 in sequence.

Next, a method for recording ID signals during continuous shooting, which is the gist of the present invention, will be explained using FIGS. 6 and 7.

In FIG. 6, (a) is the recording start key (RecKe).
y) shows the timing of pressing, and (b) shows the timing of pressing the recording stop key (Stop Key). (C), (d), and (e) are tape transport circuit 2
8. When the stop signal (d) is High, the tape is stopped and the signal (d) is High.
c) and (e), the tape is transported in the forward or reverse direction.

(It is prohibited for (c) and (e) to become High at the same time.) (f) is a signal that instructs the play mode - a signal is sent to the board (not shown), etc., and the tape is Trying to control the speed constant, or trying to control the head 10 (
In order to obtain the reproduction output shown in FIG. 5), the switch Sw is switched to the P side. (g) is the recording current (Rec Curre
nt) is shown. FIG. 7 shows the relationship between the tape, head position, and time in the first embodiment. When the tape is wound in the forward rotation direction, the tape is transferred in the direction of arrow F, and when it is wound in the reverse rotation direction. At this time, the tape is transported in the direction of arrow R. In the same figure,
This indicates that areas el and a2 have been recorded on the tape before the start of continuous shooting. In a helical scan type VTR, the recording pattern is oblique to the longitudinal direction of the tape, but in FIG. 7, for schematic representation, the pattern is drawn perpendicular to the longitudinal direction of the tape. Furthermore, although the ID signal is not recorded over the entire area of the tape, it is shown as shown in FIG. 7 for convenience of explanation.

When the Rec Key is accepted by the system control circuit 17 at time t, the tape is stored in TR until time t2.
The time tape is wound. After being in a stopped state from time t2 to time t, the tape is wound in the normal rotation direction. From time t3 to time t4, T is in the Play mode, and the playback output from the head 10 is 5Ill on the P side, preamplifier 11, head switch circuit 2, and demodulation circuit 14.
Further, the ID signals recorded in the g□ and g2 areas are guided to the data transfer controller 27 via the audio signal processing circuit 3. In the data transfer controller 27, IDO~5
The data up to this point can be set in each latch and counter, and the system control circuit 17 can take in the data. Therefore, data such as the elapsed time from the beginning of the tape and the program number recorded in the area before the start of continuous shooting can be decoded. After decoding the data, the system control circuit 17 transfers an ID signal corresponding to the data to the identification signal processing circuit 16.

In other words, it is sufficient to transfer the elapsed time from the beginning of the tape recorded in the l□t"2 area as initial data, and as the program number, data obtained by adding 1 to the previous decoded program number. Time t4
A recording current flows from 6. Newly set data is recorded in the area after ρ3. Since the Cb area is overwritten, the old data will be erased. ) Recording continues in this manner until the StoρKey is accepted at time 1, t. As a matter of course, the counter 21 for recording the elapsed time from the beginning of the tape counts up data every second when the pulse gate 26 is opened, and the data is sequentially recorded on the tape. Furthermore, in this embodiment, an example was shown in which the initial data for recording the elapsed time from the beginning of the tape is set as new data without changing the old data, but it is also possible to set data obtained by adding 1 to the old data as new data. . (NT
In the case of the SC method, 60 tracks corresponds to the amount of tape transferred in one second, so errors occur depending on where among the 60 tracks the old data was decoded.
Either method is possible due to the design. ) Next, a second example will be described. 8 is an electrical block diagram, FIG. 9 is an input/output timing diagram of the system control circuit 17, and FIG. 10 shows the relationship between tape head position and time.6 In FIG. 8,
29 is a frequency dividing circuit to which a head switch signal is supplied from a terminal 30. The only difference in the configuration of the identification signal processing circuit 16 from the first embodiment is this frequency dividing circuit 29, and the rest is the same. In the first embodiment, an oscillation circuit and a frequency dividing circuit were used to supply pulses to the pulse gate 26 every second, but in the second embodiment, pulses were supplied to the pulse gate 26 every second. Taking advantage of the fact that pulses can be obtained,
A frequency dividing circuit 29 is used to supply pulses to the pulse gate 26 every second. Although drawings and the like are omitted here, a similar configuration is adopted in which a vertical synchronizing signal is supplied from the terminal 30 instead of the head switch signal, the frequency is divided by the frequency dividing circuit 29, and a pulse is sent every second to the pulse gate 26. It goes without saying that the same effects as in the second embodiment can be obtained even if the configuration is such that the water is supplied to the second embodiment, as will be explained below.

In the first embodiment, when the Rec Key is input, the recording current is passed through the Play mode after rewinding for a certain period of time, but in the second embodiment, the recording current is passed through the Play mode.
This is an example of a device that rewinds the tape for a certain period of time and then stops when the top key is input. The following will explain based on FIGS. 9 and 10.

At time t6 during execution of the recording (Rec) mode, 5t
When the op key is accepted by the system control circuit 17, a stop signal (k) is outputted to the tape transfer circuit 28, and the tape is wound in the reverse direction during the time TR' from time t7 to time t, and then the tape is brought to a stop state. That is, in FIG. 10, after recording has been made in areas up to 16, the tape is wound up to position 1g4 and tape transport is stopped. The above is the Rec mode completion operation.

When Rec Key is accepted at time 1g, P
A lay mode command signal (m) is issued from the system control circuit 17, and the same operation as in the first embodiment is performed. That is, for 7.7 hours from time t9 to tlo, P
lay mode, and the reproduction output from the head 10 is output from the S side to the P side, the preamplifier 11, the head switch circuit 12, the demodulation circuit 14. Furthermore, through the audio signal processing circuit 3, g4
The ID signal recorded in the area from g5 to g5 is guided to the data transfer controller 27. The data transfer controller 27 stores data from IDO to 5 in each latch,
These data can be set in a counter and taken in by the system control circuit 17. After decoding the data, the system control circuit 17 transfers an ID signal corresponding to the data to the identification signal processing circuit 16. That is, as in the first embodiment, if the elapsed time from the beginning of the tape recorded immediately before as is used as initial data, and the program number is transferred by adding 1 to the previous decoded program number. good. And time t. From is the recording current (RecCurre
nt) is flushed, and newly set data is recorded in the area after 6. (Since the area from to g is overwritten, the old data will be erased.) When 5top Key is accepted after time txo, as demonstrated earlier, from time t6 to tlI. Perform the same action.

As described above, according to this embodiment, when performing continuous shooting, it is possible to rewind the tape for a certain period of time after the recording start signal is input, or to rewind the tape for a certain period of time after the recording end signal is input. , enter the playback mode for a certain period of time from the rewound state, decode the identification signal during this playback mode, generate a new identification signal according to the decoded identification signal, and start recording after the playback mode ends. By providing a means for doing so, the continuity of the identification signal can be maintained even if continuous shots are taken.

In this embodiment, the mode 5 ID signal of 8 mm video has been described, but the same method can be used for other identification signals, and a new identification signal can be generated according to the content of the signal. Needless to say.

(Effects of the Invention) As explained above, according to the present invention, the continuity of the identification signal is maintained even when continuous shooting is performed, which is very convenient for later performing high-speed tape searches, cueing, etc. , its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is an electrical block diagram for explaining the first embodiment of the present invention, FIG. 2 is a diagram showing the recording magnetization locus of 8 mm video, and FIG. 3 is a diagram showing the 8 mm video identification signal (ID signal). ), Figure 4 is a diagram showing an example of the contents of an ID signal for 8mm video, and Figure 5 explains a method for digitizing and recording audio signals for 8mm video. The electrical block diagram, FIG. 6, is the first embodiment of the present invention.
FIG. 7 is an input/output timing diagram of the system control circuit when continuous shooting is performed in the first embodiment of the present invention; FIG. 7 is a diagram for explaining the identification signal recording method in the first embodiment of the present invention; 9 is an electrical block diagram for explaining the second embodiment, FIG. 9 is an input/output timing diagram of the system control circuit in the second embodiment, and FIG.
FIG. 0 is a diagram for explaining a method of recording an identification signal when continuous shooting is performed in the second embodiment of the present invention. 10-20...Data latch, 21...Counter,
27...Data transfer controller, 28°/° tape transport circuit. Fig. 2 FOW Fig. 3 Fig. 4 Mode 5 (Prog) Mugumbar ■ ) BROOB'RAM Cumbar, F. Sen., l - Fig. 6

Claims (3)

[Claims] (1) A magnetic tape is wound diagonally around a cylinder with a built-in rotating head, so that information signals are recorded and reproduced as a group of discontinuous recording tracks, and part or all of the information signals recorded on each track are digitized. In a magnetic recording and reproducing device that includes a time-axis compressed information signal and an identification signal, when recording a continuous shot, there is provided means for reproducing the section immediately before the continuous shooting recording, and during this playback state, an identification signal that has been recorded on the tape. 1. A magnetic recording and reproducing apparatus comprising means for decoding a signal and recording an identification signal corresponding to the decoded identification signal after the reproduction state ends. (2) When the content of the identification signal is data representing the elapsed time from the beginning of the tape, the elapsed time continuous with the data decoded during the playback state is recorded as the initial data of the identification signal recorded after the playback state ends. A magnetic recording and reproducing apparatus according to claim (1), characterized in that: (3) When the content of the identification signal is data representing a program number, the identification signal recorded after the end of the playback state is characterized in that data indicating the content of the data decoded in the playback state plus 1 is recorded. A magnetic recording and reproducing apparatus according to claim (1).