AUDIO SIGNAL PROCESSING SYSTEM

摘要

While level of the inputted analog signal is adjusted according to a set analog gain value and then analog-digital converted and outputted, when an automatic compensation is on and a difference of the analog gain value and a target value is compensated by level adjustment in a digital amplifier, the analog gain value is displayed by a gain knob, and in response to an operation to turn on the automatic compensation, a present value of the analog gain value at that time is displayed as a target gain value by a mark near the analog gain value, and in response to an operation to turn off the automatic compensation, display of the target gain value is erased.

主权项

1. An audio signal processing system, comprising in one device or in a distributed manner in plural devices:
a level adjuster including an analog amplifier adjusting a level of an inputted analog signal according to a set analog gain value, an AD converter converting an analog signal outputted from the analog amplifier into a digital signal, a digital amplifier adjusting a level of a digital signal outputted by the AD converter according to a set digital gain value, and a selector selecting one of an output of the AD converter and an output of the digital amplifier as a signal to be outputted to a subsequent stage; a gain operation acceptor accepting a change operation of the analog gain value; a compensation operation adjuster accepting an on/off operation of automatic compensation in the level adjuster; an analog gain display displaying a current value of the analog gain value; and a controller which (1) according to an operation to turn on the automatic compensation, displays a current value of the analog gain value at this point as a target gain value in a vicinity of the analog gain display and causes the selector to select an output of the digital amplifier, (2) according to the change operation of the analog gain value while the automatic compensation is turned on, sets the digital gain value to a value which cancels out a difference between the target gain value and the analog gain value, and (3) according to an operation to turn off the automatic compensation, erases the display of the target gain value and causes the selector to select an output of the AD converter.