News Column

Patent Issued for Zoom Motor Noise Reduction for Camera Audio Recording

June 25, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventor Jin, Qu Gary (Kanata, CA), filed on March 15, 2011, was published online on June 10, 2014.

The patent's assignee for patent number 8750532 is Microsemi Semiconductor ULC (Ottawa, Ontario, CA).

News editors obtained the following quote from the background information supplied by the inventors: "One of the primary sources of noise in the video camera recording is the motor that controls the zooming in and out of the optical lens. This noise is audible and creates undesirable noise artifacts.

"An object of the invention is to reduce the effect of this noise."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "According to the present invention there is provided a method of reducing zoom motor noise in a camera audio recording, comprising: detecting activity of the zoom motor; transforming a audio signal into a frequency domain signal during zoom motor activity; scaling the frequency domain signal during zoom motor activity in each of a series of frequency bins by a scaling factor derived from a pre-stored zoom motor noise spectrum to produce a processed audio signal in the frequency domain; and transforming the processed audio signal back to the time domain.

"The audio signal is typically a voice signal, but it could also represent other forms of audio, such as music.

"The input signal is processed only when the zoom motor is active, which may be indicated by a motor noise indicator bit. Otherwise, the signal is bypassed with a delay matching the processed signal delay. To maintain audio continuity, this delay will equal to the motor noise processor and block data memory delay.

"Low-level white noise may added to mask the artifact due to the processing of the audio signal.

"According to another aspect of the invention there is provided a noise reduction circuit for reducing zoom motor noise in a camera audio recorder, comprising: a zoom motor activity detector; a signal processor configured to transform a audio signal into the frequency domain during zoom motor activity to obtain a frequency domain signal, scale the frequency domain signal in each of a series of frequency bins by a scaling factor derived from a pre-stored motor noise spectrum during zoom motor activity to produce a processed audio signal in the frequency domain, and transform the processed audio signal back to the time domain.

"The noise reduction circuit is simple to implement and has a very small MIPS requirement."

For additional information on this patent, see: Jin, Qu Gary. Zoom Motor Noise Reduction for Camera Audio Recording. U.S. Patent Number 8750532, filed March 15, 2011, and published online on June 10, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8750532.PN.&OS=PN/8750532RS=PN/8750532

Keywords for this news article include: Electronics, Microsemi Semiconductor ULC.

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Source: Electronics Newsweekly


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