US4495638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio-band electro-mechanical vibration converter
Assignee: BODY SONIC KK
•
Filing: 1981-02-23
•
Granted: 1985-01-22
•
Expires: 2001-02-23
Abstract
Abstract A device for giving an audio signal to a coil associated with an audio-band electromechanical converter uses a mixer, a first-stage low-pass filter, a limited and a second-stage low pass filter to correct distortion of the wave form of a signal from the limiter.
Inventors
- 👤 Kyota Yamada
- 👤 Akira Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:50
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047; A; A61; A61H; A61H23/00; A61H23/02; A61H23/0218; A61H23/0236; H04R1/00; H04R1/02; H04R1/021; H04R3/00; H04R5/00; H04R5/02; H04R5/023; H04R5/033; H04R5/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
Device to give an audio signal to a coil of a vibration converter and to generate a mechanical vibration in a casing thereof through magnetic interaction between the magnetic force developed in said coil and the magnetic force of a magnetic gap, said device comprising: a mixer to blend the 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 wave form of a signal from said limiter means; an amplifier connected to said low-pass filter, a delay circuit being added between the mixer and the low-pass filter.
Claim 2
Dependent Claim
131 words
Device to give an audio signal to a coil of a vibration converter and to generate a mechanical vibration in a casing thereof through magnetic interaction between the magnetic force developed in said coil and the magnetic force of a magnetic gap, said device comprising: a mixer to blend the 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 wave form of a signal from said limiter means; an amplifier connected to said low-pass filter, a delay circuit being added between the mixer and the low-pass filter.
Claim 3
Dependent Claim
19 words
Device of claim 1, wherein said limiter means is a limiting amplifier and said amplifier is a power amplifier.
Claim 4
Dependent Claim
11 words
Device of claim 1, wherein said limiter means is a diode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |