Quantization error in percentage when quantizing φ2k−1(x) and ψ2k−1(x). (a) Shows the error percentage when quantizing φ2k−1(x). It’s difficult
to quantize the elements with a reasonable finite word length, especially when x ≤ 0.4. (b) Shows the error percentage when quantizing ψ2k−1(x). The
quantization errors for the orthonormal basis functions can be significantly reduced.