Complex digital signal compression device, method and computer-readable storage medium, complex digital signal expansion device, method and computer-readable storage medium, and communication device

摘要

An object of the present invention is to provide the compression device and the expansion device of a complex digital signal, which further raise the compression ratio of the compression digital signal. The compression device of the present invention comprises: first section that acquires a first phase and a second phase, wherein with a complex digital signal being inputted into the complex digital signal compression device, the first phase is a phase, in polar coordinates, which the complex digital signal has, and it is assumed that the complex digital signal inputted into the complex digital signal compression device is expressed as a sum of two complex digital signals with an equal amplitude, phases of which are centered at the first phase and are shifted by a phase that equals to the second phase in the positive and negative direction respectively; and second section that compresses the first phase and the second phase respectively by performing quantization. The expansion device of the present invention comprises third section and fourth section which perform the inverse processing of the second section and the first section, respectively, mentioned above.