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Audio Signal Processing

Audio-band-electromechanical-vibration-converter

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Audio-band electromechanical vibration converter

Details

Inventors: Yamada, Kyota; Komatsu, Akira;
Assignee: Bodysonic Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Ng; Jin F.
Assistant Examiner: Byrd; Danita R.
Attorney, Agent or Firm: Wray; James C.

Audio-band electromechanical vibration converter characterized in that a yoke having a permanent magnet and a magnetic gap formed therein is displaceably housed by a damper in a casing to which a vibration plate is attached; a coil attached to the casing is placed in said magnetic gap; and the casing gives an output of a mechanical vibration synchronized with a low-band audio-signal.

DETAILED DESCRIPTION What is claimed is: 1.
Device for delivering an audio signal to a coil of a vibration converter and for generating a mechanical vibration in a casing of the converter through magnetic interaction between a magnetic force developed in said coil and a magnetic force of a magnetic gap, said device comprising: a mixer to blend outputs from a stereo unit; a first stage low-pass filter connected to said mixer to let pass a low-band audio signal for the converter; a limiter means to limit the output of said low-pass filter when the output exceeds a specified level; a second stage low-pass filter to correct a distortion of the waveform of a signal from said limiter means; and an amplifier connected to said second low-pass filter, wherein the casing comprises a vibration board having an opening for receiving the vibration converter within the opening with surfaces of the converter spaced inward from adjacent surfaces of the board.
2.
Device of claim 1, wherein said limiter means is a limiting amplifier and said amplifier is a power amplifier.
3.
Device of claim 1, wherein said limiter means is a diode.
4.
Device of claim 1, further comprising a delay circuit connected to the first-stage low-pass filter.
5.
The device of claim 1 further comprising attenuator means connected to the outputs from the stereo unit and a headphone connected to the attenuator means.
6.
The device of claim 1 further comprising: a relatively large hole in continuation of the opening adjacent a surface of the vibration board, the board having a step parallel to a surface of the board between the opening and the relaitvely large hole, the step being configured for receiving a flange connected to the vibration converter.
7.
The device of claim 6 wherein the vibration board has parallel opposite flat surfaces and wherein the opening and relatively large hole extend inward from the opposite surfaces.
8.
The device of claim 6 wherein the board has plural openings and relatively large holes and has a portion of reduced thickness between adjacent openings and holes

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