JP3417100B2 - Television receiver with built-in VTR - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver with a built-in video tape recorder (VTR), and more particularly, to a vertical deflection television set. The feature of the present invention is a noise removing means for reducing and removing a noise component induced in a sound reproducing head of a VTR by a leakage magnetic flux from a yoke. 2. Description of the Related Art Conventionally, in a television receiver with a built-in VTR, a noise component of a vertical deflection frequency (60 Hz) is applied to an audio reproducing head of the VTR due to a magnetic flux leaking from a vertical deflection yoke with the downsizing. May be induced. In order to solve this problem, as shown in FIG. 2, in order to cancel a noise component induced in the sound reproducing head 1 by a magnetic flux leaking from the vertical deflection yoke 4, the noise component is canceled by the magnetic flux leakage. The first coil 2 in which the noise component of the opposite polarity is induced is connected to the read head 1 and the read amplifier 3
Is connected to the reproducing head 1 in series. [0004] However, depending on the position of the first coil 2, the motor 5 of the VTR may be used.
The first coil 2 may open a magnetic flux leaking from the first coil, thereby generating a new noise component. In order to solve this problem, the present invention provides a specific means for reducing and eliminating the generation of the noise component due to the leakage magnetic flux from the motor while maintaining the effect of reducing the noise component of the vertical deflection frequency. . SUMMARY OF THE INVENTION [0005] A television receiver with a built-in VTR according to the present invention has a structure for canceling a first noise component induced in a reproducing head by a magnetic flux leaking from a vertical deflection yoke. A first coil, in which a noise component having a polarity opposite to that of the first noise component is induced by the leakage magnetic flux, is connected in series to the reproducing head, and a leakage magnetic flux from a motor disposed near the first coil is connected. To cancel the second noise component induced in the first coil by
A second coil in which a noise component having a polarity opposite to that of the second noise component is induced by the leakage magnetic flux from the motor is connected in series to the first coil, and the leakage magnetic flux from the vertical deflection yoke is connected to the second coil. They are arranged so as to be orthogonal. According to this structure, since the second coil is arranged so as to be orthogonal to the magnetic flux leaking from the vertical deflection yoke, it is not affected by the magnetic flux leaking from the vertical deflection yoke. It is possible to generate only the noise component of the opposite polarity that cancels out the second noise component that is generated in the first coil by the leakage magnetic flux from the motor, and thus the noise from the motor is reduced. Sound reproduction without vertical deflection frequency interference can be expected. An embodiment of the present invention will be described below with reference to FIG. This embodiment is different from the conventional example shown in FIG. 2 in that the second noise component induced in the first coil 2 by the magnetic flux leakage from the motor 5 is canceled out.
The second coil 6 in which a noise component having a polarity opposite to that of the second noise component is induced by the leakage magnetic flux is connected in series to the first coil. The second coil 6 is arranged orthogonal to the magnetic flux leaking from the vertical deflection yoke 4 so as not to be affected by the magnetic flux leaking from the vertical deflection yoke 4. According to this configuration, since the second coil 6 is arranged so as to be orthogonal to the magnetic flux leaking from the vertical deflection yoke 4, it is not affected by the magnetic flux leaking from the vertical deflection yoke 4. It is possible to generate only a reverse-polarity noise component that cancels the second noise component that is generated in the first coil 2 by the leakage magnetic flux from the motor 5, and therefore,
Sound reproduction without vertical deflection frequency interference sound can be expected while noise from the motor 5 is also reduced. As described above, according to the present invention, it is possible to realize sound reproduction in which both the noise from the motor and the vertical deflection frequency interference are canceled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a main part block diagram of an embodiment of a television receiver with a built-in VTR of the present invention. FIG. 2 is a main part block diagram of a conventional television receiver with a built-in VTR. Description: 1 reproduction head 2 first coil 3 reproduction amplifier 4 vertical deflection yoke 5 motor 6 second coil

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/027 502 G11B 31/00 541 H04N 5/93 H04N 5/64

Claims (1)

(57) Claims 1. In order to cancel a first noise component induced in a sound reproducing head by a leakage magnetic flux from a vertical deflection yoke, the first noise component is applied by the leakage magnetic flux. A first coil, in which a noise component having a polarity opposite to that of the first coil is induced, is connected in series to the audio reproducing head, and the first coil is induced in the first coil by a leakage magnetic flux from a motor disposed near the first coil. To cancel the second noise component
A second coil in which a noise component having a polarity opposite to that of the second noise component is induced by the leakage magnetic flux from the motor is connected in series to the first coil, and the leakage magnetic flux from the vertical deflection yoke is connected to the second coil. A television receiver with a built-in VTR arranged orthogonally.