Audio Amplifier Function Switching to Prevent Loud Volume Jumps
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Solution Overview
Problem
Amplification devices struggle with unintended sound volume emission when switching between amplifier functions, particularly when transitioning from a main amplifier function to a pre-amplifier or pre-main amplifier function, leading to inconsistent sound volumes.
Innovation Solution
The amplification device includes a controller and signal processing circuit that manages the volume-control knob's position by storing and retrieving sound volume settings, ensuring that when switching from the main amplifier function to other functions, the sound volume is adjusted to a previously set level to prevent unintended loud outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the amplifier function is switched from main amplifier to pre-amplifier or pre-main amplifier, then the amplifier can provide multiple functions with different volume adjustment capabilities, but unintended loud sounds are emitted due to volume setting inconsistencies
Solution Approach 1:
The controller stores the sound volume setting value before switching to the main amplifier function, and automatically restores this stored value when switching back to pre-amplifier or pre-main amplifier functions. This preliminary storage and restoration action prevents unintended loud sound emission by ensuring volume settings are consistently managed across function transitions.
2Ease of operation
If the volume control setting is maintained during function switching, then user preferences are preserved, but sound volume becomes inconsistent when switching between amplifier functions with different volume adjustment characteristics
Solution Approach 1:
The controller monitors the current amplifier function state and automatically adjusts the sound volume setting based on feedback from this state. When switching between main amplifier and pre-amplifier/pre-main amplifier functions, the controller provides feedback-driven volume adjustment to maintain consistent sound output levels, resolving the contradiction between retaining user preferences and ensuring volume consistency.
Data Source
AI summary
An amplification device is configured to operate such that when a first amplifier function is switched to a second amplifier function (S13) and then the second amplifier function is switched to the first amplifier function (S15) and at this time a state of an operating member is a state corresponding to a second sound volume larger than a first sound volume that was output right before switching from the first amplifier function to the second amplifier function (S16), the amplification device causes the state of the operating member to change to a state corresponding to a third sound volume smaller than the second sound volume (S17), and controls an amplifying operation of a signal processing circuit to cause it to output the third sound volume (S18).