US 12,470,867 B2
Semiconductor device and electronic apparatus
Takao Katayama, Matsumoto (JP); Burton Alexander, Richmond (CA); Fumihito Baisho, Kai (JP); and Tsutomu Nonaka, Hino (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Jul. 28, 2023, as Appl. No. 18/361,171.
Claims priority of application No. 2022-121540 (JP), filed on Jul. 29, 2022.
Prior Publication US 2024/0040308 A1, Feb. 1, 2024
Int. Cl. H04R 3/00 (2006.01); H04R 29/00 (2006.01)
CPC H04R 3/007 (2013.01) [H04R 29/001 (2013.01); H04R 29/008 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A semiconductor device comprising:
a pulse-width modulation circuit configured to pulse-width modulate a signal based on a first pulse-code modulated signal that is a sound source signal, and output a first pulse-width modulated signal;
a first conversion circuit configured to convert a second pulse-width modulated signal based on the first pulse-width modulated signal into a second pulse-code modulated signal; and
a comparison circuit configured to:
perform a wavelet packet analysis on the first pulse-code modulated signal to convert the first pulse-code modulated signal into a first comparison target signal by an inversely convertible conversion method;
perform the wavelet packet analysis on the second pulse-code modulated signal to convert the second pulse-code modulated signal into a second comparison target signal by the conversion method; and
compare the first comparison target signal with the second comparison target signal to calculate a correlation value therebetween.