JPH0227501A - Video tape recorder - Google Patents

Abstract

PURPOSE:To record a video signal after recording by superimposing the video signal on the surface layer part of a tape where a sound signal has been already recorded on its deep layer part with a dedicated video head and recording the video signal. CONSTITUTION:The video signal 200 from a video camera, etc., is processed in terms of brightness signal and chrominance signal by a video signal processing circuit 2 and becomes a recording video signal. The recording video signal is outputted to the video head 6 through a rotary transformer. The recording video signal is recorded on the surface layer part of the tape with the video head 6. Since the sound FM signal has been already recorded on the deep layer part of the tape with an audio head 5, the same recording format as HiFi VHS can be obtained by recording the video signal on the surface part later. Thus, the video signal can be recorded after the sound signal recorded in HiFi.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a video tape recorder (VTR) that can deeply record audio signals on tape and can perform after-recording of video signals. .

(Prior Art) Conventionally, a so-called HiFi VTR has been developed in which an audio signal is FM-modulated and recorded in the deep part of the tape in a form close to saturation recording, and at the same time a video signal is recorded on the surface of the tape. There is. Figure 2 shows the t-
1 is a schematic block diagram showing a conventional example of a 1i F i VTR. The left and right audio signals 100 L and 100 R are subjected to FM modulation processing by the audio FM signal processing section 1 to become two-frequency audio FM signals, and then output to the audio head 5 . A pair of audio heads 5 are arranged on a rotating cylinder (not shown) with a separation of 180 degrees, and record the audio FM signal in a near-saturated state in the deep part of the tape. At the same time, the video signal 200 is converted into a recorded video signal by the video signal processing section 2 and output to the video head 6. This video head 6 is mounted on the rotary cylinder at 180 mm.
The recording video signal is recorded on the surface layer of the tape with a separation of 1 pair. It is assumed that the audio head 5 and the video head 6 are placed on the rotary cylinder 90 degrees apart from each other. On the other hand, the vertical synchronization separation circuit 3 separates the vertical synchronization signal 50 from the video signal 200 and outputs it to the servo circuit 4. The servo circuit 4 outputs a control signal (hereinafter referred to as a CTL signal) 60 to the CTL head 7 in synchronization with the input vertical synchronization signal 50 and records it on the tape, and also controls the cylinder based on the vertical synchronization signal 50. Controls the rotation of the motor 8. Note that after the CTL signal is recorded on the tape, the audio FM signal and the recorded video signal are recorded in the same track in an overlapping manner. In this way, in the HlFI VTR, the audio FM signal is azimuthally recorded in the deep part of the magnetic layer of the tape in a form close to saturation recording, and the recorded video signal is azimuthally recorded in the surface part of the tape. The audio FM signal and the video signal can be separated and played back separately depending on the difference in azimuth of the playback video head. However, in the conventional t-m''*vTR, the audio signal and the video signal are simultaneously recorded redundantly on the tape, so it is not possible to time-shift the video signal and the audio signal and record them separately. It was impossible to record the video signal after recording.

(Problems to be Solved by the Invention) As mentioned above, in conventional Hi-Fi VTRs, the audio signal is recorded in the deep part of the tape and the video signal is recorded in the surface part of the tape at the same time, so the audio signal and the video signal are time-shifted. Therefore, after recording the audio signal in the deep part of the tape, it is not possible to after-record the video signal in the surface part of the tape. SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks, and aims to provide a video tape recorder that can record an audio signal in the deep part of the tape and then after-record a video signal in the surface part of the same tape. There is.

[Structure of the Invention] (Means for Solving the Problem) The present invention provides a video tape recorder that superimposes and records an audio signal and a video signal on a tape using a rotating head.
An audio signal recording means for recording only FM modulated audio signals in the deep layer of the tape using a dedicated audio head, and a surface layer of the tape where the audio signal has already been recorded in the deep layer of the tape by the audio signal recording means. Additionally, it has a configuration that includes video signal recording means for recording video signals in an overlapping manner using a dedicated video head.

(Function) In the video tape recorder of the present invention, the audio signal recording means performs FM modulation and records only the audio signal in the deep part of the tape using a dedicated audio head.

The video signal recording means uses a dedicated video head to superimpose and record the video signal on the surface layer of the tape on which the audio signal has already been recorded in the deep layer of the tape.

(Embodiment) An embodiment of the VTR of the present invention will be described below with reference to drawing tr. FIGS. 1(A) and 1(B) are block diagrams showing the outline of one embodiment of the VTR of the present invention, (^) shows the audio signal recording system and the servo system at that time, and (B) shows the video signal recording system. FIG. 2 is a diagram showing a recording system for after-recording a signal and a servo system at that time.

1 is an audio FM signal processing unit that performs FM modulation on an input audio signal to produce an audio FM signal and then outputs it to the audio head 5; 2 is an audio FM signal processing unit that performs FM modulation on an input audio signal and outputs the signal to the audio head 5; 2 processes a luminance signal and a color signal on an input video signal to produce a recording video signal. A video signal processing unit, 3 is a vertical synchronization separation circuit that separates a vertical synchronization signal from the video signal 200, and 4-1 is a servo recording circuit that controls the rotation of the cylinder motor 8 during recording and outputs a CTL signal to the CTL head 7. , 4-2 is a servo playback circuit that controls the rotation of the cylinder motor 8 during playback and outputs a CTL signal to the GTL head 7; 5 is an audio head that deeply records audio FM signals on a tape (not shown); 6; 7 is a CTL head that records video signals on the tape, 8 is a cylinder motor that rotates the cylinder on which the audio head 5 and video head 6 are mounted, and 9 is a VTR tuner. output the audio signal. 10 is a changeover switch for switching between tuner 9 and line 12, and 11 is a reference signal oscillator that generates a reference signal 100 to be supplied to servo recording circuit 4-1 during recording.

Next, the operation of this embodiment will be explained. First, HiFi
If you want to record only the audio signal on tape, please refer to Figure 1 (
This is done using the audio recording system shown in A). That is, the user selects tuner 9 or line 1 by switching switch 10.
Select by switching between the two.

As a result, the audio FM signal processing section 1 performs FM modulation for the left and right two channels of the input audio signal 100 to create an audio FM signal, which is transmitted to the cylinder (not shown) via a rotary transformer (not shown). 1) Output to the upper audio head 5. The audio head 5 records the audio FM signal in a substantially saturated state in the deep part of the tape. At this time, the servo recording circuit 4-1 is connected to the reference signal oscillator 11.
The cylinder motor 8 is rotated so as to be frequency and phase locked to the reference vertical synchronization signal @50 outputted from the cylinder motor 8, a CTL signal is created based on the vertical synchronization signal 50, and this CTL signal is output to the CTL head 7. Then, CT
Record the L signal on tape. In this case, no signals are applied to the video head 6, including the carrier. Therefore, only the audio signal is deeply recorded on the tape.

Next, when only the video signal is to be after-recorded, the after-recording video signal recording system shown in FIG. 1(B) is used. However, it is assumed that the tape on which only the audio signal is recorded is rewound. A video signal 200 from a video camera or the like is subjected to luminance signal and color signal processing by the video signal processing circuit 2 to become a recorded video signal.

This recorded video signal is output to the video head 6 via a rotary transformer (not shown), and this video head 6
A recorded video signal is recorded on the surface layer of the tape. Therefore, as mentioned above, since the audio FM signal is recorded in the deep layer of this tape, by later recording the video signal in the surface layer, the same recording format as HiF;V+S is achieved. Furthermore, when recording the video signal, the CTL head 7 reproduces the CTL signal already recorded in the circuit shown in FIG. 1(A), and this reproduced CTL signal is input to the servo reproduction circuit 4-2. be done. On the other hand, the vertical synchronization separation circuit 3 separates the vertical synchronization signal from the video signal 200 and outputs it to the servo reproduction circuit 4-2.

For this reason, the servo playback circuit 4-2 controls the frequency and phase of the cylinder motor 8 based on the input vertical synchronization signal 50 and the playback CTL signal, which are external synchronization signals, to play the tape at V.
The tape pattern follows the HS format. However, at this time, it is assumed that no signal is applied to the audio head 5.

According to this embodiment, the audio signal recording system and servo system shown in FIG. 1(A) and the after-recording video signal recording system shown in FIG. 1(B) are provided, and first, the audio signal recording mode is Then, only the audio signal is deeply recorded on the tape using the circuit shown in FIG. 1 (A), and then in the after-recording mode, the video signal is recorded using the circuit shown in FIG. By overwriting the surface layer of the existing tape, the audio signal and video signal can be time-shifted and recorded. Therefore, )−
After the recorded audio signal, the video signal can be after-recorded.

[Effects of the Invention] As described above, according to the video tape recorder of the present invention, there is an effect that audio signals can be deeply recorded on tape and video signals can be after-recorded.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a video tape recorder of the present invention, and FIG. 2 is a block diagram showing an example of a conventional video tape recorder. 1...Audio FM signal processing unit 2...Video signal processing unit 3...Vertical synchronization separation circuit 4-1...Servo recording circuit 4-2...Servo playback circuit 5...Audio head 6・・・Video head 7・
・・CTL head 8・・Cylinder motor agent'Patent attorney Noriyuki Chika Yudo Hiroshi UjiFigure 1

Claims (1)

[Claims] In a video tape recorder that superimposes and records an audio signal and a video signal on a tape using a rotating head, an audio signal recording means that records only an FM modulated audio signal in a deep part of the tape using a dedicated audio head; It is characterized by comprising a video signal recording means for overlappingly recording a video signal using a dedicated video head on the surface layer of the tape on which the audio signal has already been recorded in the deep layer of the tape by the signal recording means. video tape recorder.