Audio Amplifier Wake-Up Control for Off-State Speaker Vibration
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Solution Overview
Problem
In audio systems with multiple speakers closely installed, the cone paper of a power amplifier in an off state can vibrate due to sound energy from operating speakers, leading to reduced overall sound energy and a risk of damaging elements when power is returned to the amplifier.
Innovation Solution
An amplifier with a VI detection circuit and controller that turns on the power amplifier when the detected voltage exceeds a predetermined value, preventing sound energy absorption and protecting elements from reverse electromotive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the power amplifier is kept in off state to reduce power consumption, then power consumption is reduced, but sound energy is absorbed by the speaker cone paper causing vibration and potential damage
Solution Approach 1:
The controller proactively turns on the power amplifier before harmful sound energy can cause significant vibration and damage to the speaker cone paper. By detecting the presence of sound energy from other speakers and preemptively activating the power amplifier, the system prevents the harmful effect of cone paper vibration while minimizing power consumption during actual audio playback.
2Object-affected harmful factors
If the power amplifier is turned on to prevent sound energy absorption, then sound energy absorption is reduced, but power consumption increases
Solution Approach 1:
Instead of keeping the power amplifier continuously on, the controller implements periodic monitoring of sound energy levels and activates the amplifier only when sound energy from other speakers is detected. This on-demand activation approach maintains protection against sound energy absorption while minimizing unnecessary power consumption during periods when no other speakers are operating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces sound energy absorption by speakers in an off state, maintaining sound pressure and protecting amplifier elements from damage due to vibrations and reverse electromotive forces.
Implementation Method 1
a VI detection circuit that is connected to a rear stage of the power amplifier to detect power of an output signal of the power amplifier
Implementation Method 2
cone paper of a speaker that is connected to an power amplifier whose power supply is in off state is caused to vibrate by sound energy that is output from operating speakers
Implementation Method 3
the absorbed sound energy causes the speaker that is connected to the amplifier whose power supply is in off state to return power to the power amplifier's side
Data Source
AI summary
An amplifier includes a power amplifier that amplifies an input signal, a VI detection circuit that is connected to a rear stage of the power amplifier to detect power of an output signal of the power amplifier, and a controller that turns on the power amplifier when the input signal is inputted to the power amplifier, turns off the power amplifier when the input signal is not inputted to the power amplifier, and turns on the power amplifier when the VI detection circuit detects a voltage that exceeds a predetermined value when the power amplifier is in off state.