Patent ID: 6075819
Filing Date: 2000-06-13
Classification: H04N

Abstract:
An apparatus for controlling a video rate for CBR MPEG video signal which is quantized by a quantizer, encoded by an encoder and then stored in a buffer to be transmitted through a transmission channel, the video rate controlling apparatus using fuzzy rule-based control comprising:a differential error calculator calculating an error e(n) which is a difference between a target buffer occupancy O.sub.T and a current buffer occupancy O(n) and a differential error value d(n) which is a difference between the error e(n) and a previous error e(n-1);a fuzzifying block translating the error and the differential error to linguistic input variables based on a membership function;a decision making block making decision about linguistic judgement based on a predetermined set of rules and making a linguistic output value; anda defuzzifying block calculating crisp outputs for a quantization step size of the quantizer by a membership function of the linguistic output value, wherein the membership function has wider spacing in a middle range and narrower spacing in end ranges.