Patent ID: 6282241
Filing Date: 2001-08-28
Classification: H04N

Abstract:
An apparatus for controlling a video rate of a 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, comprising:a first error calculator, which calculates a first error which is a difference between a current buffer occupancy and a set point value which is prescribed as a reference value of buffer occupancy;a second error calculator, which calculates a second error which is a difference between a current video quality value and a set point value which is predetermined as a target video quality value;a fuzzifying block coupled to receive the first value and a scaled second error value, the scaled second error being the second error value scaled by the first error value, and translate the first error and the scaled second error to linguistic input variables based on a first membership function;a deciding block, which makes linguistic output variables from the linguistic input variables according to a prescribed set of rules; anda defuzzifying block, which determines a quantization step size of the quantizer from the linguistic output variables according to a second membership function.