| 摘要 |
<p>A converter for digital radio applications, consisting of a parallel analogue to digital converter (1) that provides sampling at signal carrier frequency, or preferably at a harmonic of this frequency. Successive samples S(Ζ) are stored in a memory (14) and this is accessed at a lower rate to average numbers of samples. The ADC achieves greater resolution by virtue of this sampling. Filtering is provided by averaging action, but further filtering functions can be performed by an add-on filter (7). The converter (1) receives modulated analogue signal from an input stage (13), for example the rf. or if. circuit of a radio receiver. In a modified version of the apparatus (Fig. 6), several converters (1) may be utilized in parallel to afford increased data collection.</p> |
