USB Audio Adapter Dynamic Mode Switching
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Solution Overview
Problem
USB audio adapters often fail to meet user expectations by using the built-in audio devices for both audio playback and input when a connected device is only a headphone or microphone, leading to inconvenience and inefficient power usage when not connected to any device.
Innovation Solution
A control method and system for a USB audio adapter that dynamically detects the connected device's function and operates in disconnected mode when not in use, allowing the host to use built-in audio devices as needed and reducing power consumption by selectively enabling or disabling modules based on the detected device type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the USB audio adapter is enumerated as a headset device to support both audio output and input functions, then the adapter can work with various devices (headphones, microphones, headsets), but the host cannot use built-in audio devices when only a single-function device is connected
Solution Approach 1:
The patent implements dynamic device declaration by detecting the connected device type and changing the USB audio adapter's declaration accordingly. The adapter dynamically switches between declaring itself as an audio output device, audio input device, or headset device based on the actual connection, allowing the host to appropriately use built-in audio devices when needed.
Solution Approach 2:
The patent changes the declaration parameter of the USB audio adapter based on detection results. When a pure headphone device is detected, the adapter declares itself as an audio output device; when a pure microphone device is detected, it declares itself as an audio input device. This parameter change enables the host to correctly configure audio device usage.
2Reliability
If the USB audio adapter operates in connected mode to maintain communication with the host, then audio data can be transmitted, but power consumption increases when no device is connected
Solution Approach 1:
The patent implements dynamic mode switching between connected mode and disconnected mode based on whether a device is detected at the analog audio interface. When no device is connected, the adapter switches to disconnected mode to save power while maintaining USB connection for quick reconnection. When a device is connected, it switches to connected mode to ensure reliable audio data transmission.
3Reliability
If the USB audio adapter declares itself as a specific device type, then the host can correctly route audio data, but the adapter cannot adapt to different connected devices
Solution Approach 1:
The patent performs preliminary detection of the connected device type before declaring the USB audio adapter. The detection circuit detects whether the connected device is a headphone device, microphone device, or headset device, and based on this detection result, the adapter declares itself as the appropriate type (audio output device, audio input device, or headset device) to ensure correct audio data routing.
Data Source
AI summary
A control method and a control system for an audio device are disclosed. The control method and control system are applied to a USB audio adapter that includes an analog audio interface and is connected to a host. The control method includes steps of: detecting whether the analog audio interface is connected to a target device or detecting a function of the target device, and generating a detection result accordingly; controlling the USB audio adapter to operate in a disconnected mode; and controlling the USB audio adapter to continue operating in the disconnected mode according to the detection result, or controlling, according to the detection result, the USB audio adapter to operate in a connected mode and transmit audio data to the host and/or receive audio data from the host.