Canon Kabushiki Kaisha

Tetsuya Wakui

Koji Takahashi

Takashi Kobayashi

Toshiyuki Masui

Tsutomu Fukatsu

Taizou Hori

Kenichi Nagasawa

Katsuji Yoshimura

Nobutoshi Takayama

Koji Tajima

According to this invention, mechanical noise from a noise source of a pre-identified device can be removed, while tracing a change in gain of acoustic wave data, and noise is removed by tracing a change over time of the noise source. To this end, the gain of a signal from a microphone is automatically adjusted by an Auto level control unit (ALC). A threshold according to the gain of the ALC is stored in a register. A comparator compares audio data from the ALC with the threshold, generates weighting coefficients k and 1&#x2212;k based on the comparison result, and outputs them to weighting coefficient multipliers. The weighting coefficient multipliers and an adder calculate a weighted average value of data in a memory that stores weighting coefficients of old frames and the input acoustic wave data, and update the contents of the memory by the calculation result. With this update processing, the memory stores only a NOISE component. A level adjusting unit adjusts data read out from the memory according to the current gain of the ALC. An adder subtracts the adjusted data from the input acoustic wave data, and outputs data after noise removal.

Electronic device and its control method

According to this invention, if noise generated by operation of a component such as a rotary drum of a recording/playback apparatus which operates periodically enters a microphone, noise waveforms can be extracted and reduced. Data obtained from microphones () are converted into digital data by A/D converters () and are supplied to a control microcomputer () and adders (). The control microcomputer () has a memory which stores input data for respective mechanical noise generation cycles. The microcomputer () calculates the average of inphase data in each cycle, thereby generating only data of noise components and storing the result in memories (). The adders () output data without noise components by subtracting the inphase data stored in the memories () from input current data.

Electronic device, video camera apparatus, and control method therefor

A recording apparatus having a microphone unit; and a drive unit adapted to drive a disk medium on which sound collected by the microphone unit is to be recorded. The recording apparatus is capable of changing a rotational speed of the drive unit in accordance with a level of the sound collected by the microphone unit.

Recording apparatus

A reproducing apparatus for reproducing an information signal recorded on a recording medium is provided with a reproducing part arranged to reproduce the information signal recorded on the recording medium and to output the reproduced information signal, a muting circuit for muting the information signal outputted from the reproducing part, a detecting circuit for detecting the level of a noise component included in the information signal outputted from the reproducing part, and a control part for controlling a muting action of the muting circuit on the basis of a result of detection provided by the detecting circuit. These parts in combination enable the reproducing apparatus to reproduce the information signal without generating any noise component, in a minimal length of time after the commencement of reproduction.

Reproducing apparatus

A reproducing apparatus for reproducing a video signal and date-and-time information related to the video signal is arranged to detect a change in date on the basis of the date-and-time information reproduced, to display the data-and-time information for a predetermined period of time according to the change in date, and to inhibit the data-and-time information from being displayed after the lapse of the predetermined period of time.

Reproducing apparatus for processing recording date-and-time information

An audio processing apparatus is arranged to be capable of attenuating only an unnecessary wind noise without cutting off the low frequency part of sounds picked up. In the apparatus, a first low frequency band signal and a first high frequency band signal are extracted from a signal obtained by subtracting a delayed right-side audio signal from a received left-side audio signal. A second low frequency band signal and a second high frequency band signal are extracted from a signal obtained by subtracting a delayed left-side audio signal from a received right-side audio signal. An addition signal is formed by adding together the extracted first low frequency band signal and the extracted second low frequency band signal. The extracted first low frequency band signal and the addition signal are added together in an arbitrary variable addition ratio to obtain a first variable addition signal. The extracted second low frequency band signal and the addition signal are also added together in an arbitrary variable addition ratio to obtain a second variable addition signal. The extracted first high frequency band signal is outputted with the first variable addition signal added thereto, while the extracted second high frequency band signal is outputted with the second variable addition signal added thereto.

Audio processing apparatus

In an audio signal output device, when muting audio signals outputted from audio signal output terminals, a ground terminal provided for the audio signal output terminals is brought into an open state in association with the muting action, so that the audio signals can be adequately muted without causing any noise or the like.

Audio signal output device

A rotation control device including a rotary head drum drive circuit for driving rotation of a rotary head drum, a tape transport mechanism for transporting a tape in a predetermined direction relative to the rotary head drum, and a correction circuit for detecting a change of the speed of transportation of the tape to supply correction information to the rotary head drum drive circuit so that the driving state of the rotary head drum is corrected.

Device for controlling the rotation of the head drum

An information signal reproducing apparatus operating with selection of kinds of recording media having information signals and pilot signals for tracking control recorded thereon, which apparatus includes a reproducing head for reproducing the information signals and the pilot signals and a signal processing circuit receptive of the pilot signals for forming a tracking control signal for controlling a relative position of the head to the recording medium, whereby the processing characteristic of the processing circuit is changed over in response to the kind of the used recording medium.

Information signal reproducing apparatus

An apparatus for reproducing an information signal from a recording medium on which many tracks are formed, by periodically tracing the recording medium with a recording head. The position of the reproducing head relative to the recording medium is controlled on the basis of a tracking error signal which is obtained from the signals reproduced by the reproducing head. The track pitch is determined by a discrimination of a binary signal which is formed on the basis of a determination of whether the tracking signal is within a predetermined range.

Information signal reproducing apparatus with function of detecting

A rotation control device comprises a rotary body arranged to move a head and a recording medium relative to each other in performing recording or reproduction on or from the recording medium; means for performing speed servo-control by detecting any speed deviation of the rotary body; means for performing phase servo-control by detecting any phase deviation of the rotary body; and means for performing the speed servo-control over the rotary body by detecting a phase-locked state of the rotary body and by synchronizing the rotary body with a synchronizing signal reproduced from the recording medium.

Rotation control device using reproduced synchronizing signal

A multi-channel reproducing apparatus which is capable of reproducing a recorded information signal from each of a plurality of areas of a tape shaped record bearing medium extending in the longitudinal direction of the medium is arranged to reproduce the information signal by repetitively allowing the medium to travel at a high speed while changing the information signal reproducing area from one area over to another.

Multi-channel reproducing apparatus with searching for programs

A recording and reproducing apparatus for recording and reproducing main information consisting of a plurality of programs longitudinally on and from a tape-shaped recording medium is arranged to have time information recorded along with the main information on the recording medium indicating a length of time from the beginning of each of the programs; and to control the travel of the recording medium on the basis of the time information reproduced from the recording medium.

Growing community of inventors

Kanagawa, Japan

Tetsuya Wakui