1. A method for improving computation time of speech recognition processing in an electronic device, the method comprising: by a processor: obtaining a table value, from a plurality of table values each corresponding to a unique summation of vector element values of a first vector, via an index corresponding to an encoded form of a combination of quantized element values of a second vector; and computing a dot product value of the first and second vectors using the table value obtained, the vector element values, and the quantized element values, the processor using fewer mathematical operations to compute the dot product value relative to a standard dot product computation of the first and second vectors, the speech recognition processing performing multiple dot product computations.