Circuit device, sound reproduction device, and electronic apparatus
AssigneeSeiko Epson Corporation
InventorsTakao Katayama, Fumihito Baisho, Tsutomu Nonaka
Life of this patent
Estimating the term…
Abstract
A circuit device (100) includes a PWM signal output circuit (110) that outputs a PWM signal (SPWM) to a sound outputter (10), and a processing circuit (120) that controls the PWM signal output circuit (110). The frequency band that the sound outputter (10) can output is denoted as an outputtable band, and the frequency band lower than a lower limit of the outputtable band is denoted as a non-output low frequency band. The PWM signal output circuit (110) outputs a PWM signal (SPWM) based on pseudo sound data in which overtones, of a plurality of overtones of a fundamental tone belonging to the non-output low frequency band, that belong to the outputtable band are used.
Claims16
A circuit device comprising:
- a PWM signal output circuit configured to output a PWM signal to a sound outputter;
- and
- a processing circuit configured to control the PWM signal output circuit,
- wherein, when a frequency band that the sound outputter can output is denoted as an outputtable band, and a frequency band lower than a lower limit of the outputtable band is denoted as a non-output low frequency band,
- the PWM signal output circuit outputs a PWM signal based on pseudo sound data in which overtones, of a plurality of overtones of a fundamental tone belonging to the non-output low frequency band, that belong to the outputtable band are used,
- wherein, when a frequency band that includes a highest sound pressure peak in frequency characteristics of the sound outputter, is entirely within the outputtable band, and is narrower than the outputtable band, is set as a predetermined band,
- the PWM signal output circuit outputs the PWM signal based on the pseudo sound data in which overtones, of the plurality of overtones, that exclusively belong to the predetermined band are used.
Dependencies are inferred from the claim text.