Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker – With magnetic loudspeaker
Patent
1984-09-07
1985-11-26
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
With magnetic loudspeaker
1791155VC, 329193, 381 96, 381121, H04R 308, H04R 906
Patent
active
045557977
ABSTRACT:
In a loudspeaker system for converting an n-bit digitized electric signal (6) into an acoustic signal a plurality of sections (voice coils 14.1, 14.2, 14.3, 14.p) of a digital loudspeaker (1) are driven directly by the p most significant bits of the n-bit digitized electric signal (6). The loudspeaker (1) comprises at least one additional section (14.p+1). This (p+1).sup.th voice coil receives a signal from a digital-to-analog converter (5), the input signal of the digital-to-analog converter comprising at least the n-p least significant bits (FIG. 2). In a different embodiment the digital-to-analog converter (5) receives all the n bits of the digitized electric signal as the input signal. At least the p sections (14.1 to 14.p) which correspond to the p most significant bits are provided with means (the resistances r) for producing a signal which is a measure of the sum of their instantaneous drive signals and for applying the said signal to a signal combination unit (32) arranged in the line (10) from the output of the digital-to-analog converter (5) to the (p+1).sup.th section (R.sub.1). By means of this correction circuit the distortion in the loudspeaker system can be reduced substantially (FIG. 3b).
REFERENCES:
patent: 3651266 (1972-03-01), Queen
patent: 3889060 (1975-06-01), Goto et al.
patent: 4360707 (1982-11-01), Joseph et al.
Nieuwendijk Joris A. M.
Sanders Georgius B. J.
van Gijsel Wilhelmus D. A. M.
van Nieuwland Jacob M.
Briody Thomas A.
Byrd Danita R.
Rubinson Gene Z.
Streeter William J.
U.S. Philips Corporation
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