JPH11176113A5

JPH11176113A5 -

Info

Publication number: JPH11176113A5
Application number: JP1997337231A
Authority: JP
Filing date: 1997-12-08
Publication date: 2004-12-02
Anticipated expiration: 2017-12-08

Description

【０００１】
【発明の属する技術分野】
本発明は電子機器のノイズ低減装置及び記録装置のノイズ低減装置に関する。 [0001]
[Technical Field to which the Invention Belongs]
The present invention relates to a noise reduction device for an electronic device and a noise reduction device for a recording device.

【００３５】
第１１の本発明は、第５の本発明の記録装置のノイズ低減装置において、回転手段は、モータによって駆動される、情報信号の記録可能なディスク状記録媒体を支持する回転支持手段である記録装置のノイズ低減装置である。[0035]
An eleventh aspect of the present invention is the noise reduction device for a recording device according to the fifth aspect of the present invention, wherein the rotating means is a rotating support means driven by a motor and supporting a disk-shaped recording medium on which an information signal can be recorded.

【００６８】
そして、スピンドル７１及び台７２が、モータ（スピンドルモータ）７０によって回転せしめられる。このモータ７０には、その回転を制御するサーボ手段４３が設けられている。このサーボ手段４３は、制御マイクロコンピュータ４２の機能の一部を構成する。又、サーボ手段４３から出力されるのは、ディスク周波数ＦｄのインパルスＩＰｆｄである。[0068]
The spindle 71 and base 72 are rotated by a motor (spindle motor) 70. The motor 70 is provided with a servo means 43 that controls the rotation of the motor 70. The servo means 43 constitutes part of the function of the control microcomputer 42. The servo means 43 outputs an impulse IP fd at the disk frequency Fd.

Claims

1. A noise reduction device for electronic equipment, comprising energy wave generating means driven by a drive signal from a drive signal source to generate an energy wave, and configured to reduce periodic noise mixed in an information signal based on the energy wave from the energy wave generating means,
a pseudo-noise generating means for generating pseudo-noise as an impulse response of the reference input, the pseudo-noise generating means being supplied with the information signal containing the periodic noise and using an impulse having the same frequency as the drive signal from the drive signal source as a reference input;
and subtraction means for subtracting the pseudo noise from said pseudo noise generating means from the information signal mixed with said periodic noise to obtain an information signal with reduced periodic noise.

2. The noise reduction device for electronic devices according to claim 1,
The pseudo noise generating means
a signal proportional to the information signal obtained by said subtraction means from said pseudo noise to obtain a new pseudo noise;

2. The noise reduction device for electronic devices according to claim 1,
The pseudo noise generating means
decimating means for decimating the pseudo noise at a predetermined ratio;
a storage means for storing the decimated pseudo-noise;
and interpolation means for interpolating the decimated pseudo-noise read from the storage means at a ratio corresponding to the predetermined ratio to restore the pseudo-noise to the original sampling frequency.

2. The noise reduction device for electronic devices according to claim 1,
A noise reduction device for electronic equipment, further comprising limiting means for limiting the level of the information signal containing the periodic noise and supplied to the pseudo-noise generating means when the level is excessive.

1. A noise reduction device for a recording device, comprising a microphone and a rotating means driven by a motor, wherein periodic noise mixed into an audio signal from the microphone is reduced through the microphone based on the rotation of the rotating means,
pseudo-noise generating means for generating pseudo-noise as an impulse response to an audio signal containing the periodic noise and an impulse having the same frequency as a motor drive signal from a servo means for the motor as a reference input;
and subtraction means for subtracting the pseudo-noise from said pseudo-noise generating means from the audio signal mixed with said periodic noise to obtain an audio signal with reduced periodic noise.

6. The noise reduction device for a recording device according to claim 5,
The pseudo noise generating means
a signal proportional to the audio signal from which periodic noise has been reduced, the signal being obtained by the subtraction means; a signal proportional to the audio signal from which periodic noise has been reduced, the signal being added to the pseudo-noise;

6. The noise reduction device for electronic devices according to claim 5,
The pseudo noise generating means
decimating means for decimating the pseudo noise at a predetermined ratio;
a storage means for storing the decimated pseudo-noise;
and interpolation means for interpolating the decimated pseudo-noise read from the storage means at a ratio corresponding to the predetermined ratio to restore the pseudo-noise to the original sampling frequency.

6. The noise reduction device for a recording device according to claim 5,
A noise reduction device for a recording device, further comprising limiting means for limiting the level of the noise-mixed audio signal supplied to said pseudo-noise generating means when the level of the audio signal is excessively high.

6. The noise reduction device for a recording device according to claim 5,
A plurality of the microphones are provided,
A noise reduction device for a recording device, wherein said pseudo-noise generating means and said subtracting means are provided for each of said plurality of microphones.

6. The noise reduction device for a recording device according to claim 5,
10. A noise reduction device for a recording device, wherein the rotating means is a rotating drum driven by a motor, equipped with a rotating head, and around which the magnetic tape is wound and guided.

6. The noise reduction device for a recording device according to claim 5,
A noise reduction device for a recording device, wherein the rotating means is a rotating support means driven by a motor and supporting a disk-shaped recording medium on which an information signal can be recorded.