Decoding apparatus, decoding method, recording media and programs

• Main Authors: SUGIURA RYOSUKE, KAMAMOTO YUTAKA, KAWANISHI TAKAHITO, MORIYA TAKEHIRO, HARADA NOBORU, KAMEOKA HIROKAZU
• Format: Patent
• Language: Chinese; English
• Published: 11.01.2022
• Subjects: ACOUSTICS; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

An encoding apparatus is an encoding apparatus for encoding a time-series signal for each of predetermined time sections in a frequency domain, wherein a parameter Eta is set as a positive number, the parameter Eta corresponding to a time-series signal is a shape parameter of generalized Gaussian distribution that approximates a histogram of a whitened spectral sequence, which is a sequence obtained by dividing a frequency domain sample sequence corresponding to the time-series signal by a spectral envelope estimated by regarding the Eta-th power of absolute values of the frequency domain sample sequence as a power spectrum, and any of a plurality of parameters Eta is selective or the parameter Eta is variable for each of the predetermined time sections. The encoding apparatus comprises an encoding portion encoding the time-series signal for each of the predetermined time sections by an encoding process with a configuration identified at least based on the parameter Eta for each of the predetermined time sect