HDMI Audio Embedding for Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sound recording systems for digital and mirror-less single-lens reflex cameras often suffer from inadequate sound quality when recording video, as they typically require separate sound recording devices connected via analog interfaces, leading to signal degradation.
Innovation Solution
A sound recording apparatus that connects via HDMI to cameras and external devices, embedding microphone audio signals into the HDMI signal without processing the video image, ensuring high-quality audio output without degradation, even when the camera has only analog sound input terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sound recording apparatus is connected to a backup image recording apparatus via analog connection, then compatibility with existing devices is improved, but audio signal quality deteriorates due to degradation
Solution Approach 1:
The sound recording apparatus acts as an intermediary device between the camera and backup image recording apparatus. It receives digital audio signals from the camera via HDMI, processes/embeds them into the HDMI signal stream, and transmits the combined signal to the backup recorder. This intermediary function enables digital audio transmission without direct analog connection, maintaining signal quality while ensuring compatibility.
Solution Approach 2:
The invention replaces the analog mechanical connection system with a digital HDMI-based transmission system. Instead of using analog audio cables that cause signal degradation, the system embeds digital audio signals within the HDMI digital signal stream, substituting the analog transmission mechanism with a digital one that preserves audio quality.
2Manufacturing precision
If audio signals are embedded in HDMI signal channels, then audio signal quality is improved by avoiding analog conversion, but channel allocation complexity increases when existing audio signals are present
Solution Approach 1:
The channel allocation mechanism is made dynamic and adaptive. The sound recording apparatus automatically detects which audio channels are already occupied in the HDMI signal and dynamically selects appropriate channels for embedding the microphone audio signal. This dynamic adaptation resolves the allocation complexity by making the system flexible rather than fixed.
Solution Approach 2:
The system performs self-allocation of audio channels by automatically detecting the HDMI signal's current audio channel usage and selecting appropriate channels for embedding. The apparatus serves itself by autonomously managing channel allocation without requiring manual configuration or external intervention, thereby simplifying the overall system operation despite the underlying complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A sound recording apparatus is provided which is HDMI-connected to a camera and another device, which outputs a video image signal from the camera to the other device without processing, and which outputs to the other device, without degradation, an audio signal recorded separately from the camera. A sound recording apparatus is HDMI-connected to a camera and a backup image recording apparatus. The sound recording apparatus includes an HDMI receiver that receives an HDMI signal transmitted from the HDMI-connected camera, a controller that embeds an audio signal which is input from a microphone which is connected to the apparatus in an audio channel portion of the HDMI single, and an HDMI transmitter that outputs to the backup image recording apparatus the video image signal included in the HDMI signal and the audio signal embedded by the controller.