H - Electricity – 04 – R
Patent
H - Electricity
04
R
179/35
H04R 23/00 (2006.01) H04R 1/00 (2006.01) H04R 3/04 (2006.01) H04R 9/06 (2006.01)
Patent
CA 1209926
ABSTRACT: Hybrid loudspeaker system, at option with one or more correction circuits. 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)th voice coil receives a signal from a digital-to-analog converter (5), the input signal of the digilal-to-analog converter com- prising 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 con- verter (5) to the (p+1)th section (R1). By means of this correction circuit the distortion in the loudspeaker system can be reduced substantially (Fig. 3b).
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Nieuwendijk Joris A.m.
Sanders Georgius B.j.
Van Gijsel Wilhelmus D.a.m.
Van Nieuwland Jacob M.
Fetherstonhaugh & Co.
N.v.philips'gloeilampenfabrieken
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