Abstract: Disclosed is a charge redistribution codec employing a two capacitor network for developing a progression of reference voltages having a binary relationship to each other for each analog input sample to be encoded. Linear encoding of input samples is achieved with the use of two such charge redistribution networks, with one developing positive reference voltages and the other developing negative reference voltages. Analog input samples are placed in an encoding capacitor and based on the polarity of the voltage across the capacitor either a positive or a negative charge is added iteratively to the capacitor in the direction of driving the voltage across that capacitor to zero. A code is developed by assigning at each iteration one value to an output code bit when a positive voltage is added and the opposite value to the bit when a negative voltage is added.

Abstract: A bandwidth reduced teleconferencing system achieving good video presence. The bandwidth reduction is accomplished by dividing the video picture of the camera into segments, by determining the activity level within each segment and by transmitting the signal of each segment with a resolution level which is related to the activity level within the segment. The most active segment is transmitted at highest resolution while other segments are transmitted at lower resolutions.

Abstract: Disclosed is a distributed prioritized concentrator that manages the flow of information through high data rate communications paths. The concentrator accumulates incoming packets as necesary, sorts the accumulated packets in parallel based on the relative priority of the packets, and transmits as many of its highest priority packets as there are available communication channels. In its simplest form the prioritized concentrator comprises a parallel sorting network having some of its inputs connected to accept incoming signal packets and the remaining ones of its inputs connected to outputs of delay elements. A number of the highest priority sorting network outputs are connected to outgoing communication channels, a number of lower priority sorting network outputs are connected to inputs of the delay elements and the remaining number of lowest priority sorting network outputs are left unconnected. More sophisticated forms which add various capabilities are also disclosed.