Patent ID: 11894858
Assignee: YAMAHA CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A non-transitory memory storing a program executable by a computer of an analog to digital A/D conversion device that includes an amplifier configured to amplify an input analog signal with an analog gain corresponding to a gain state and outputs the amplified analog signal, and a converter that converts the output amplified analog signal to a digital signal and outputs the digital signal, the method comprising:
detecting the output amplified analog signal exceeding a range defined by a first level;
upon detecting that the output amplified analog signal exceeds the range defined by the first level, lowering the gain state to a next lower state corresponding to a one-step lower gain than a current gain of the amplifier;
detecting the output digital signal having been continuously within a range defined by a second level for a predetermined period; and
upon detecting that the output digital signal has been continuously within the range defined by the second level for the predetermined period, increasing the gain state to a next higher state corresponding to a one-step higher gain than the current gain of the amplifier,
wherein an absolute value of the second level is smaller than an absolute value of the first level.