JPS61192003A - magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus capable of recording and reproducing a PCM audio signal and a video signal on the same track and rewriting only the PCM audio signal.

BACKGROUND OF THE INVENTION In recent years, there has been a trend towards Hi-Fi audio in magnetic recording and reproducing apparatuses, and PCM audio signals are recorded and reproduced on magnetic tapes separately from video signals.

An example of the above-mentioned conventional magnetic recording/reproducing device will be described below with reference to the drawings.

FIGS. 3 and 4 show a configuration diagram of a conventional one-time recording/reproducing apparatus and a diagram of a track pattern on a magnetic tape.

In FIG. 3, 1 is a rotating cylinder, and 2 is a magnetic tape, on which video signals and PCM signals are recorded. 3.4 is the first and second posts that help the tape run, 5 is the rotating head,
It is constructed by attaching first and second heads R and L to a rotating cylinder 1. 6 is a fixed erasing head for erasing signals recorded on the magnetic tape.

In the conventional magnetic recording/reproducing apparatus configured as described above, the signals recorded on the magnetic tape 2 are first erased by the fixed erasing head 6. At the same time, track A in FIG. 4 is recorded on the magnetic tape 2 by the first head R of the rotary head 5. When the rotary cylinder 1 makes one revolution, a track 8 is recorded by the second head of the rotary head 5.

7.7' is a PCM audio area, and 8.8' is a video signal area.

Problems to be Solved by the Invention This conventional configuration has a problem in that all signal components that have already been recorded by the fixed erasing head 6 are erased.

The present invention rewrites only the PCM audio It area (hereinafter referred to as
The purpose of the present invention is to provide a magnetic recording/reproducing device that can perform post-recording.

Means for Solving the Problems The magnetic recording/reproducing apparatus of the present invention records a video signal area and a data signal on one track of a magnetic tape using two or more rotating heads.
a fixed erasing head configured to record and reproduce data by dividing the area, and erasing both the video signal area and the data signal area; and a fixed erasing head mounted on the same rotating cylinder as the rotating head and configured to erase only signals from the data signal area. The present invention is characterized in that it is provided with a flying erase head for erasing data, and a control circuit that turns off the fixed erase head and operates the flying erase head during post-recording.

Effect: With this configuration, the fixed erase head is turned off and the flying erase head is activated by an after-recording command, so that only the data signal area can be rewritten without affecting the video signal area.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2. Components having the same functions as those in FIG. 3 are given the same reference numerals and their explanations will be omitted.

In FIG. 1, 9a and 9b are flying erase heads attached to the rotary cylinder 1, and the PCM of FIG.
Flying erase head 9 for audio area 7.7' only
a and 9b, and the rotary head 5 performs post-recording of the PCM audio signal.

FIG. 2 shows its circuit configuration diagram. 10 is a recording amplifier,
The PCM audio signal and video signal are amplified and sent to the first . A flow M is caused to flow through the second heads R and L so that signals can be recorded on the magnetic tape. 11a, 1
1b is a rotary transformer, rotary transformer 11
a transmits the signal from the recording amplifier 10 to the first .a of the rotary head 5. Second
, or the signals on the magnetic tape 2 are supplied to the heads R and L of the first . The second heads R and L supply the signal to the head amplifier 13 via the take-out switch 12. The rotary transformer 11b transmits a drive signal to the flying erase heads 9a and 9b. The switch 12 is switched by a recording/reproduction command. 14a and 14b are a fixed erase head 6 and a flying erase head 9a, respectively.
, 9b, 15a and ISb are switches that supply power to the drive circuits 14a and 14b, respectively, and 16 is a control circuit that controls the switches ISa and 15b.

Here, when a playback signal is extracted from the magnetic tape 2 on which PCM audio and video signals are recorded and after-recording is performed only in the PCM audio area, the control circuit 16 drives the fixed erase head 6 to support the after-recording. The switch 15a that applies power to the circuit 1.4a is turned off to stop the operation of the fixed erase head 6, and the switch 15b that applies power to the drive circuit 14b of the flying erase heads 9a and 9b is turned on to stop the operation of the flying erase head 9a. .

Let's make 9bellJ. Also, during dubbing, switch 1
2 switches to the reproduction side for the video signal area 8.8', and switches to the recording side for the PCM audio area 7.7'. The recording amplifier 10 outputs a PCM audio signal during post-recording.

In this way, only the PCM audio area 7.7' of the recorded magnetic tape is erased by the flying erase heads 9a, 9b.
, and a new PCM audio signal is written in this erased position by the rotary head 5.

In the above embodiment, the flying erase head 9a.

9b was used exclusively for erasing the PCM audio area, but this flying erase head can be used in place of a long play head. In other words, a short play head with a wide head gap (2-hour mode head in the VH8 system) separates the video signal area and data signal area for recording and playback, and during post-recording, a long play head with a narrow head gap (VH8 The same effect can be obtained by applying a signal for erasing the recorded PCM audio area 7.7' using the 6-hour mode head.

Although the above embodiment has been described using a PCM audio signal as the data signal area, there is no problem with other signals as well.

As described in the detailed description of the invention, the magnetic recording and reproducing apparatus of the present invention is configured to separate and record and reproduce a video signal area and a data signal area on one track of a magnetic tape using two or more rotating heads, and Both the video signal area and the data signal area @
There is a fixed erase head that erases the area, a flying erase head that is installed on the same rotating cylinder as the rotary head and erases only the signal in the data signal area, and a flying erase head that operates by turning off the fixed erase head during dubbing. Since the t+IJ1 circuit is provided, it is possible to post-record only the data signal area without affecting the video signal area of the recorded magnetic tape.

Further, in a device having a long play head and a short play head, the configuration can be simplified by substituting the long play head for a flying erase head during post-recording.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the vicinity of a rotating cylinder according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a drive circuit for each head in FIG. 1, and FIG.
This figure is a block diagram of a conventional magnetic recording/reproducing device, and FIG. 4 is a tape pattern diagram. 6... Fixed erase head, 9a, 9b... Flying erase head, 1G-... Recording amplifier, 11a, Il
b...Rotary transformer, 12.15a, 15
b...Switch, 13...Head amplifier, 14a
, 14b... Drive circuit, 16... Control circuit agent Hiroshi Morimoto Figure 1

Claims (1)

[Scope of Claims] One or more rotary heads are configured to separate and record and reproduce a video signal area and a data signal area on one track of a magnetic tape, and the video signal area and the data signal area are separated. A fixed erase head that erases both signal areas, a flying erase head that is installed on the same rotating cylinder as the rotating head and erases only the signal in the data signal area, and a flying erase head that operates by turning off the fixed erase head during post-recording. A magnetic recording/reproducing device equipped with a control circuit for controlling 2. A short play head with a wide head gap is used to separate a video signal area and a data signal area for recording and reproduction, and a long play head with a narrow head gap is used as a flying erase head instead. The magnetic recording and reproducing device according to scope 1.