发明名称 |
Hybrid loudspeaker system for converting digital signals to acoustic signals |
摘要 |
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 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)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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申请公布号 |
US4555797(A) |
申请公布日期 |
1985.11.26 |
申请号 |
US19840648428 |
申请日期 |
1984.09.07 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
NIEUWENDIJK, JORIS A. M.;VAN GIJSEL, WILHELMUS D. A. M.;SANDERS, GEORGIUS B. J.;VAN NIEUWLAND, JACOB M. |
分类号 |
H04R9/00;H04R1/00;H04R3/00;H04R3/04;H04R9/04;(IPC1-7):H04R3/08;H04R9/06 |
主分类号 |
H04R9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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