Patent ID: 11881227
Assignee: INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 7:
8. An audio signal compression apparatus comprising:
a memory storing at least one instruction; and
a processor executing the at least one instruction stored in the memory,
wherein the at least one instruction enables the compression apparatus to perform (a) restoring, in a highest layer, an input audio signal as a first signal, (b) restoring, in at least one intermediate layer, a signal obtained by subtracting an upsampled signal, which is obtained by upsampling the audio signal restored in the highest layer or an immediately previous intermediate layer, from the input audio signal as a second signal, and (c) restoring, in a lowest layer, a signal obtained by subtracting an upsampled signal, which is obtained by upsampling the audio signal restored in an intermediate layer immediately before the lowest layer, from the input audio signal as a third signal,
the first signal, the second signal, and the third signal being combined to output a final restoration audio signal and the highest layer, the at least one intermediate layer, and the lowest layer each comprising an encoder, a quantizer, and a decoder.