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| Number | Title | Issue Date |
| 6031481 | Analogue and digital converters A signal convertor comprising a pulse modulator. and means for modifying the signal input thereto in dependence upon the error in previous values or the output thereof, to reduce the effects of said error within a desired signal band.... | 02/29/2000 |
| 5784017 | Analogue and digital convertors using pulse edge modulators with non-linearity error correction A signal convertor comprising a pulse modulator, and a modifier for modifying the signal input thereto in dependence upon the error in previous values of the output thereof, to reduce the effects of said error within a desired signal band.... | 07/21/1998 |
| 4897879 | Multi-way loudspeaker system A multi-way loudspeaker system comprising at least two series connected loudspeakers (ZH, ZL) connected to a common signal input (1, 2) for reproducing different parts of the full frequency spectrum of an audio signal applied to the ... | 01/30/1990 |
