| 摘要 |
Consumer devices (1,11) comprise signal converters (2,12) for converting input signals into output signals. These signal converters (2,12) comprise chaotic dither generators (3,13,23,33) to reduce or attenuate pattern noise or idle tones resulting from input signals being slowly varying signals or having small amplitudes or comprising DC components. Chaotic dither generators (3,13,23,33) generate chaotic dither signals which decorrelate pattern noise or idle tones sufficiently, and better than pseudo random dither generators which generate dither signals based on finite pseudo random sequences. The signal converters (2,12) constitute oversampling converters or sigma delta modulators or delta sigma modulators. The chaotic dither generators (3,13,23,33) comprise transistor circuits (34) and amplifier (35) coupled to each other via switches (36,37). The transistor circuit (34) comprises three transistors (41-43). The signal converters (2,12) are low cost and low complex and have good price/performance ratios. |
