A television audio signal encoder includes a matrix that sums a left channel audio signal and a right channel audio signal to produce a sum signal. Moreover, detection areas of a sensed image are synthesized by controlling camera parameters for each of the detection areas so as to optimize camera parameters for all of the areas in the object image. It is determined whether the aggregation exception structure will be handled by an exception handler. The computed slope may be a quantized slope value having a first number of bits of precision.