Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With magnetic loudspeaker
Patent
1983-04-08
1984-08-07
Pellinen, A. D.
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With magnetic loudspeaker
381116, 381 89, 1791155DV, H04R 300
Patent
active
044647859
ABSTRACT:
A loudspeaker system includes at least one electromagnetic loudspeaker assembly having a single vibratory coil form to which a vibratory diaphragm is attached. Two or more voice coils are wound on the vibratory coil form, each operating within a magnetic field. Electronic circuitry includes a signal conditioning network and a pair of amplifiers, one amplifier for each of the voice coils. The signal conditioning network, possibly preceded by a filter, is arranged to feed the respective amplifiers, the latter being coupled to their respective ones of the voice coils. D.C. currents provide forces in each of the voice coils, such that these forces are caused to oppose one another. The signal currents in the voice coils are such that the difference in the forces developed by the voice coils produce a vibratory motion of the voice coil form and the diaphragm attached thereto. A power supply is provided. A variable impedance circuit is connected between the power supply and the voice coils for adjusting the D.C. current supplied to the voice coils, whereby the D.C. current will vary either automatically with peaks of the input signal level or with the setting of a volume control. The automatically varying level is set by a forward fed control signal developed by rectifying the input signal and integrating it to produce a slowly varying D.C. level. In the second case, the control signal is developed by a potentiometer which is mechanically ganged to a volume-control potentiometer.
REFERENCES:
patent: 2926221 (1960-02-01), Kagdis
patent: 3679833 (1972-07-01), Inoue
patent: 3686446 (1972-08-01), Manger
patent: 4360707 (1982-11-01), Joseph et al.
Bloom Leonard
Cluxton Charles N. K.
Dwyer James L.
Pellinen A. D.
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