Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With magnetic loudspeaker
Patent
1992-10-05
1994-09-13
Kuntz, Curtis
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With magnetic loudspeaker
381111, H04R 300
Patent
active
053475879
ABSTRACT:
A speaker driving device applies a constant voltage of a constant voltage source to a pair of voice coils alternatively by switching the direction of applying the constant voltage based on a binary PDM signal. A .DELTA..SIGMA. modulator produces the binary PDM signal by .DELTA..SIGMA.-modulating a digital audio signal from a digital low-pass filter. The constant voltage is applied to a first voice coil in one direction and is applied to a second voice coil in the reverse direction by switching the direction of applying the constant voltage. The first and second voice coils forms the pair of voice coils. This arrangement causes a current to flow through the first and second voice coils in opposite directions and a diaphragm of a speaker to be driven in two directions opposite to each other. As a result, the speaker is driven more efficiently. Moreover, since the switching of the direction of applying the constant voltage is performed by changing the connections between the constant voltage source and the pair of voice coils, a switching circuit with a simplified structure is used.
REFERENCES:
patent: 4360707 (1982-11-01), Joseph et al.
patent: 5051799 (1991-09-01), Paul et al.
patent: 5079551 (1992-01-01), Kimura et al.
"Possibility for Developing PCM Digital Speaker" (JAS Journal, Jan. 1982, Japan).
Hayase Toru
Ohbayashi Kunihiko
Takahashi Ryutaro
Kuntz Curtis
Lee Ping W.
Sharp Kabushiki Kaisha
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