Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Driven diverse static structure
Reexamination Certificate
1998-10-22
2001-10-23
Le, Huyen (Department: 2743)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Driven diverse static structure
C381S173000, C381S361000, C381S431000
Reexamination Certificate
active
06307942
ABSTRACT:
TECHNICAL FIELD
The invention relates to microphones and more particularly to microphones comprising panel-form acoustic elements.
BACKGROUND ART
It is known from GB-A-2262861 to suggest a panel-form loudspeaker comprising:
a resonant multi-mode radiator element being a unitary sandwich panel formed of two skins of material with a spacing core of transverse cellular construction, wherein the panel is such as to have ratio of bending stiffness (B), in all orientations, to the cube power of panel mass per unit surface area (&mgr;) of at least
10
;
a mounting means which supports the panel or attaches to it a supporting body, in a free undamped manner;
and an electro-mechanical drive means coupled to the panel which serves to excite a multi-modal resonance in the radiator panel in response to an electrical input within a working frequency band for the loudspeaker.
DISCLOSURE OF INVENTION
Embodiments of the present invention use members of nature, structure and configuration achievable generally and/or specifically by implementing teachings of our co-pending parent application Ser. No. 08/707,012. Such members thus have capability to sustain and propagate input vibrational energy by bending waves in operative area(s) extending transversely of thickness often but not necessarily to edges of the member(s); are configured with or without anisotropy of bending stiffness to have resonant mode vibration components distributed over said area(s) beneficially for acoustic coupling with ambient air; and have predetermined preferential locations or sites within said area for transducer means, particularly operationally active or moving part(s) thereof effective in relation to acoustic vibrational activity in said area(s) and signals, usually electrical, corresponding to acoustic content of such vibrational activity. Uses are envisaged in co-pending parent application Ser. No. 08/707,012, for such members as or in “passive” acoustic devices without transducer means, such as for reverberation or for acoustic filtering or for acoustically “voicing” a space or room; and as or in “active” acoustic devices with transducer means, such as in a remarkably wide range of sources of sound or loudspeakers when supplied with input signals to be converted to said sound, or in such as microphones when exposed to sound to be converted into other signals.
This invention is particularly concerned with active acoustic devices in the form of microphones.
Members as above are herein called distributed mode acoustic radiators and are intended to be characterised as in the above parent application and/or otherwise as specifically provided herein.
The invention is a panel-form microphone characterised by a stiff lightweight member having capability to sustain and propagate input vibrational energy by bending waves in at least one operative area extending transversely of thickness to have resonant mode vibration components distributed over said at least one area and have predetermined preferential locations or sites within said area for transducer means and having a transducer mounted wholly and exclusively on said member at one of said locations or sites to produce a signal in response to resonance of the member due to incident acoustic energy. The member may be mounted in a surrounding frame by means of an interposed resilient support. Two or more of the said transducers may be positioned at the locations or sites on the member. The member may have a cellular core sandwiched between skins. The or each transducer may be a piezo-electric device.
REFERENCES:
patent: 3347335 (1967-10-01), Watters et al.
patent: 4700396 (1987-10-01), Bolin
Azima Henry
Colloms Martin
Harris Neil John
Foley & Lardner
Le Huyen
New Transducers Limited
LandOfFree
Panel-form microphones does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Panel-form microphones, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Panel-form microphones will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2583174