JPS63288587A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute a recording in an optimum aperture correcting quantity to always match with an input electric field strength by automatically changing a recording aperture correcting quantity in correspondence to the electric field strength of the input electric wave of a tuner. CONSTITUTION:An appropriate aperture correcting quantity determining means 11 determines the appropriate aperture correcting quantity based on the electric field strength of the input wave of a tuner 2. Next, an aperture correcting quantity control means 12 generates an aperture correcting quantity control signal based on the aperture correcting quantity determined by the determining means 11 and gives it to an aperture correcting circuit 13. The correcting circuit 13 controls a record amplifier 8 according to the given control signal and changes a record aperture correcting quantity. Thus, a recording is executed in the optimum aperture correcting quantity to always match with the input electric field strength.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a magnetic recording i1g generation device that can automatically perform appropriate recording aperture correction according to the electric field strength of input radio waves to a tuner. It is.

[Prior Art] Fig. 2 is a block diagram of a video recording system of a conventional magnetic recording/reproducing device. It includes a tuner (2) for amplification, a VIP circuit (3) for amplifying the intermediate frequency of the video signal, and an RF-AGC circuit (0) for keeping the video detection output of the tuner/VIFffi (1) constant. (5) is a recording signal processing section, which includes a color signal processing circuit (6), a luminance signal processing circuit (7), and a recording amplifier (8). Furthermore, it includes an aperture supplementary IF circuit (9).

Next, the operation will be explained. The human-powered radio waves from antenna A are detected by tuner (2), amplified, and then V I F
Circuit (3) Powered by two people. The vIF circuit (3) converts this input into an intermediate frequency and amplifies it again. Tuner @
The output of the VIF section (1) varies depending on the electric field strength of the input radio wave. In order to make this a constant value, the RF-AGC circuit (4) sends an output corresponding to the output fluctuation of the VIP circuit (3) to the high frequency amplifier circuit of the tuner (2), and the output of the VIP circuit (3) is Keep it constant.

On the other hand, in the recording signal processing section (5), the video signal is divided into a color signal processing circuit (6) and a luminance signal processing circuit (7). In order to do this, the aperture correction circuit (9) performs seven pertier corrections. Thereafter, the video signal passes through an FM modulation circuit (not shown) and a recording amplifier (8), is amplified, and is applied to the rotating drum (14) of the deck section (10).

[Problems to be Solved by the Invention] In the conventional magnetic recording/reproducing device, the recording aperture is corrected by the aperture correction circuit (9).

As mentioned above, the electric field strength of the input radio waves to the tuner is always constant regardless of its strength, so if the input electric field strength is low, more 7 pertier correction will be applied than necessary, and this will cause the outline of the reproduced image to glare. There was a problem that it became difficult to see.

This invention was made in order to solve these problems, and it is possible to dynamically perform recording with appropriate recording aperture corrections H and 'L corresponding to the electric field strength of the human-powered radio waves of the tuner, and to improve the electric field strength. The objective is to obtain a magnetic recording and reproducing device that can obtain reproduced images that are easy to see even when the image quality is low.

[Means for Solving the Problems] The magnetic recording and reproducing device according to the present invention includes a field strength detection circuit that detects the field strength of a human-powered radio wave to a tuner, and a detection signal of the field strength detection circuit that is manually operated to set an appropriate aperture. Appropriate aperture correction rIt determining means for determining the correction amount;
The apparatus includes an aperture correction amount control means for controlling the aperture correction amount according to the output of the aperture correction means for determining the appropriate aperture correction, and a recording aperture correction circuit that can change the aperture correction 1, ``in accordance with the output of the aperture correction amount control means. It is something that

[Function] In the magnetic recording and reproducing apparatus of the present invention, an appropriate aperture correction amount is determined based on a detection signal from an electric field strength detection circuit, and a
A perch correction amount control signal is created, and the aperture correction circuit changes the recording aperture correction amount according to this control signal, so recording is always performed with the optimal 7-pitch correction amount commensurate with the input electric field strength. be exposed.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a recording system of an embodiment of a magnetic recording/reproducing apparatus according to the present invention. In FIG. 0, the same parts as those in FIG.

In this embodiment, the RF-AGC circuit (4) is used as a field strength detection circuit that detects the field strength of the input radio wave of the tuner (2). (11) is an appropriate aperture correction amount determining means that receives the detection signal of the RF-AGC circuit (4) and determines an appropriate aperture correction amount; an aperture correction amount control means for controlling an aperture correction amount;
(13) is the aperture supplement, E! , X control r-i (12)
This is a recording aperture correction circuit that can change the recording aperture correction; 11 according to the output of the recording aperture correction circuit.

1- In the magnetic recording and reproducing device configured as described above,
RF-AGC circuit (4) in tuner/VIF section (1)
depends on the electric field strength of the input radio wave to the tuner (2). When the electric field strength is high, the high frequency amplification gain of the tuner (2) is lowered, and when the electric field strength is low, the high frequency amplification gain of the tuner (2) is decreased. It outputs a signal that acts to raise the temperature. This signal can also be used to perform normal recording aperture correction when the field strength is high, and to reduce the recording aperture correction IF when the field strength is low. The signal from this RF-AGC circuit (0) is manually added to the appropriate aperture correction decision hand fi (11) to determine the appropriate aperture correction amount, and based on the appropriate aperture Jli +E ?1j, the aperture h13
The correction amount of the recording aperture correction circuit (13) is controlled by the stage (12).

In this way, if recording is performed when the electric field strength of the tuner (2) is low, the aperture correction amount will be small, so that when the recorded portion is played back, the reproduced image will be easy to see without glare on the outline. can be obtained.

In addition, in the above embodiment, RF-AGC is used in the electric field strength detection circuit.
Although a circuit using the circuit (4) is shown, an independent electric field strength detection circuit or another circuit having an output according to the electric field strength may be used, and the same effects as in the above embodiment can be obtained.

[Effect of the Invention 1 As described above, according to the present invention, the recording aperture correction J11 is automatically changed according to the electric field strength of the tuner's human-powered radio waves, so the tuner can be adjusted without complicating the operation. This has the effect that recording can be performed with an appropriate recording aperture correction amount for the electric field strength of input radio waves, and a reproduced image that is easy to see can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a video recording system of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a video recording system of a conventional magnetic recording and reproducing apparatus. (2)...Tuner, (4)...RF-AGC circuit, (ll)...Determining means for appropriate aperture correction, (
+2)...Aperture correction U4F stage, (13)
... Recording aperture correction circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) An electric field strength detection circuit that detects the electric field strength of the input radio wave of the tuner, an appropriate aperture correction amount determining means that receives the detection signal of this electric field strength detection circuit as input, and determines an appropriate aperture correction amount, and this appropriate aperture correction amount. A magnetic recording/reproducing device comprising: aperture correction amount control means for controlling an aperture correction amount according to the output of the determining means; and a recording aperture correction circuit capable of changing the aperture correction amount according to the output of the aperture correction amount control means. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the electric field strength detection circuit is an RF-AGC circuit for keeping the video detection output constant.