Bluetooth Audio Delay Control for Video Sync Across Output Devices
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Solution Overview
Problem
Existing wireless communication systems for audio output devices, such as Bluetooth, often fail to synchronize video and audio signals due to differing output times across various devices, making it impossible to set a compensation value for synchronization.
Innovation Solution
A signal processing apparatus with a communication unit for recognizing connected audio output devices via Bluetooth, a controller to determine and apply a delay value for synchronizing video and audio signals, and storage to manage delay values for specific devices, allowing users to input or store delay values for precise synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Bluetooth wireless communication is used to output audio signals to various audio output apparatuses, then wireless connectivity and device compatibility are improved, but audio-video synchronization deteriorates due to varying output timings across different devices
Solution Approach 1:
The patent applies local quality by configuring different delay values specifically for each type of audio output apparatus (headphones, speaker, car audio) rather than using a uniform delay setting. The controller identifies the connected device type and applies the corresponding delay value from storage, allowing each device category to receive customized timing compensation that matches its specific output characteristics.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the delay parameter based on the identified audio output apparatus type. The system stores multiple delay values (e.g., first delay value for headphones, second for speaker, third for car audio) and selects the appropriate parameter setting according to the connected device, thereby optimizing audio-video synchronization for each specific apparatus.
2Measurement precision
If delay compensation is applied to synchronize audio and video signals, then synchronization accuracy is improved, but system complexity increases due to the need to store and manage multiple delay values
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple delay values in the storage unit before actual audio output occurs. Each delay value is prepared in advance for different audio output apparatus types, allowing the controller to quickly retrieve and apply the appropriate delay without complex real-time calculations, thus maintaining low system complexity while achieving high synchronization accuracy.
3Measurement precision
If manual input of delay values is allowed for user customization, then user control and precision are improved, but ease of operation deteriorates due to requiring user intervention
Solution Approach 1:
The patent implements self-service by enabling the controller to automatically identify the connected audio output apparatus type and select the appropriate pre-stored delay value without requiring manual user input. The system serves itself by autonomously configuring the optimal delay setting based on device identification, thereby maintaining high precision while significantly improving ease of operation.
Data Source
AI summary
A signal processing apparatus and a control method thereof are provided. The signal processing apparatus includes: a signal processor which respectively processes an input video signal and an input audio signal; a communication unit which is communicably linked with an external audio output unit that outputs the audio signal; and a controller which controls the signal processor to delay and process one of the video signal and the audio signal by a delay value corresponding to the external audio output unit if the external audio output unit is predetermined.