JPH03123200A - Wind noise removing device and sound recorder - Google Patents

Abstract

PURPOSE:To effectively remove wind noise by providing the wind noise removing device with a timer circuit to be reset correspondingly to a signal outputted from a wind noise detecting circuit and a control circuit for driving a wind noise removing circuit in the counting period of the timer circuit. CONSTITUTION:The wind noise removing device is provided with a single directivity microphone 1, a non-directivity microphone 2, a wind noise detecting circuit 3 for comparing signals outputted from both microphones 1, 2 and detecting wind noise, an HPF 4 for acting as a wind noise removing circuit, a change-over switch 5, and the timer circuit constituted of resistors 6 to 8, a capacitor 9, a transistor 10, and a comparator 11. The wind noise removing action is continued during the counting operation of the timer circuit, and when a new noise is detected during the period, the counting operation of the timer circuit is started again from the initial stage. When the detection of wind noise is repeated for a short period of time due to frequent wind blowing, the counting operation of the timer circuit is repeatedly reset. Since the removal of wind noise can be continuously executed without generating interruption on the way, a feeling of physical disorder is not given to a person listening reproduced sound.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a wind noise detection and removal device and an audio recording device equipped with the same.

(B) Conventional Technology For example, a unidirectional microphone is often used as a microphone installed in an 8 mm VTR or the like. However, in such a single directional microphone, since the diaphragm has a low mechanical impedance at low frequencies, wind noise is likely to be superimposed on the collected audio signal. Therefore, it is preferable that such a device is equipped with a wind noise detection and removal device that detects wind noise and removes the wind noise from the audio signal.

Claims (3)

[Claims] (1) In a wind noise detection and removal device that includes a microphone, a wind noise detection circuit, and a wind noise removal circuit, a timer circuit that is reset in response to a signal from the wind noise detection circuit, and a timer circuit that is reset in response to a signal from the wind noise detection circuit; A wind noise detection and removal device comprising a control circuit for operating the wind noise removal circuit. (2) In a wind noise detection and removal device having a microphone, a wind noise detection circuit, and a wind noise removal circuit, the sound collection stop detection circuit detects the stop of sound collection, and the detection output from the wind noise detection circuit A wind noise detection and removal device comprising: a control circuit that activates the wind noise removal circuit and deactivates the wind noise removal circuit based on a detection signal from the sound collection stop detection circuit. (3) An audio recording device comprising a microphone, a recording circuit for recording a signal from the microphone, a wind noise detection circuit, and a wind noise removal circuit for removing wind noise from an audio signal sent to the recording circuit, An audio recording device comprising: a detection circuit that detects the operating state of the recording circuit; and a control circuit that controls the wind noise removal circuit according to a detection output from the detection circuit and a detection output from the wind noise detection circuit. Device.