| 摘要 |
The present invention is directed to a read only memory, wherein the preferred embodiment provides an analog read only memory using charge coupled devices. Fixed but selectable charge packets are used to charge elements in a charge coupled device array; where selectable charging may be provided by selecting resistor values, selecting capacitor values, selectable masking of photo detectors, and other such methods. The accumulated fixed packets of charge are then shifted with a charge coupled device register to provide sequential analog signal outputs. Use of an analog read only memory permits hybrid signal processing such as for voice response. Use of a serial output simplifies the accessing and reduces accessing electronics by eliminating the more complex random access arrangements. The analog read only memory of the present invention has the additional advantage of being a non-volatile memory for preserving stored information when power is removed; where conventional charge coupled device memories are volatile and lose all stored information when power is removed. The analog read only memory of the present invention is particularly useful in systems for generating analog output signals such as voice response systems and filtering systems. Accessing of analog samples from the read only memory can be controlled with a digital processor such as by controlling shifting of the charge couple device shift register and by selecting the desired output information under digital control. |
