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Audio signal processing and coding - 2.5.3 the discrete cosine transform

2022-04-23 19:13:00 【cjzcjl】

Discrete cosine transform is also referred to as DCT Transformation . About functions x(n) The discrete cosine transform of can be defined as ：

When , And in when ,c(k)=1.x(n) Of DCT The calculation depends on the periodicity of the input signal and on the shaping , Different orthogonal transformation algorithms can be used （ Usually it is DCT1、2、3 and 4）, More about DCT For details of the transformation, please refer to chapter... Of this book 6 section .