USB Audio Volume Synchronization Without Sudden Loud Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
When an audio device connects to a host apparatus via USB, sudden loud sounds can occur due to mismatched volume settings, as existing systems change the host's volume value without maintaining the audio device's pre-set volume.
Innovation Solution
An audio device with a volume control unit, communication unit, and control unit that compares received volume instructions from the host with its own set volume and sends adjustment signals to equalize the volume setting, preventing sudden loud outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the audio device receives and sets the volume value from the host apparatus, then volume equalization between host and audio device is achieved, but sudden loud sound may be emitted that damages the device or adversely affects the human body
Solution Approach 1:
The control unit performs preliminary comparison of the received volume value with the currently set volume value before actually setting the volume. This preliminary action allows the system to detect potential harmful volume changes in advance and take preventive measures by controlling the volume increase rate or notifying the user, thereby preventing sudden loud sounds while still achieving volume equalization.
2Object-affected harmful factors
If the volume value from the host is disregarded to prevent sudden loud sound, then device safety is maintained, but volume equalization to the host setting cannot be made
Solution Approach 1:
The control unit continuously monitors and compares the received volume value from the host with the currently set volume value, and based on this feedback, dynamically adjusts the volume setting. The system provides feedback to the host apparatus about the current volume state and adjusts the volume incrementally, achieving both device safety and volume equalization through continuous feedback control.
3Ease of operation
If the volume value is changed to the maximum value when connected to host, then normal sound volume control by application is enabled, but the audio device loses its pre-set volume setting
Solution Approach 1:
The system dynamically adjusts the volume value based on the comparison between the received volume value and the currently set volume value. Instead of statically setting the volume to maximum, the control unit controls the volume increase rate and adjusts the volume progressively, enabling both normal volume control functionality and preservation of the pre-set volume setting through dynamic adaptation.
Data Source
AI summary
An audio device includes an amplifier having a volume control circuit, a communication circuit configured to communicate with a host apparatus, a processor, and a memory having stored thereon instructions executable by the processor to cause the audio device to perform: setting a volume value in the volume control circuit; receiving, from the host apparatus through the communication circuit, an instruction value indicating a volume value to be set in the volume control circuit; comparing the received instruction value with a set value that is a volume value set in the volume control circuit; and sending an instruction signal based on a comparison result to the host apparatus through the communication circuit.