发明名称 |
DIGITAL-ANALOGOMVANDLARE MED DIGITAL-ANALOGHJELPOMVANDLARE |
摘要 |
A digital-to-analog converter is described for converting (b+a)-bit code words into an analog signal by means of a b-bit auxiliary digital-to-analog converter. In order to reduce the quantizing noise introduced by the indispensible quantizing of the (b+a)-bit code words for obtaining the b-bit code words these (a+b)-bit code words are applied to an integrating network which has its output connected to an amplitude-limiting device which brings the integrated signal in the signal range of the auxiliary-D/A converter. The output signal of the amplitude-limiting device is now quantized and this quantizing signal is applied to the auxiliary D/A converter which produces analog output signal samples which are applied to, possibly, an analog output filter through a cascade arrangement of an amplitude-restorer and a difference network. The (b+a)-bit code words are assumed to occur with a frequency which is higher than the Nyquist sampling frequency associated with the analog signal represented by these (b+a)-bit code words. |
申请公布号 |
SE7909790(L) |
申请公布日期 |
1980.05.31 |
申请号 |
SE19790009790 |
申请日期 |
1979.11.27 |
申请人 |
PHILIPS NV |
发明人 |
PEEK J B H;MECKLENBREUKER W F G;CLAASEN T A C M;VAN HURCK N |
分类号 |
H03M1/66;H03M1/00;H04B14/04 |
主分类号 |
H03M1/66 |
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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