| 摘要 |
A radio receiver comprises frequency translation means (20, 21, 22) for frequency down converting an input signal to an intermediate signal, digital channel selection filtering means including at least one analogue-to-digital converter(ADC) (32, 33), the ADC comprising an over-sampling quantizer(Q1, Q2) having a plurality of dynamically selectable quantization levels, and means (30, 31, 36) responsive to the characteristics of the input signal for adjusting the resolution of the ADC to the characteristics of the input signal. The ADC may comprise a Sigma-Delta ADC. The resolution may be adjusted by altering the over-sampling rate and/or selecting the number of quantization levels to handle the prevailing interference and the wanted signal. |
