Digital Interface Receiver Audio Noise Control
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Solution Overview
Problem
High-speed digital interface standards like HDMI experience audio noise due to cable disconnection, power-supply issues, or transmission errors, causing user discomfort and potential damage to audio output devices.
Innovation Solution
A digital interface receiver with a mute circuit controlled by detection devices that assess the interface state, including voltage, clock, and error detection, to mute or unmute the audio signal based on detected conditions, reducing noise and providing on-screen error messages for user awareness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the audio signal is transmitted during video blanking interval in high-speed digital interface, then the audio transmission capability is improved, but audio noise is generated due to cable disconnection, power-supply issues, or transmission errors
Solution Approach 1:
The system performs preliminary detection of interface state (voltage level, clock signal presence, error rate) before audio signal transmission. The detection device checks these parameters in advance to determine whether the transmission environment is stable, preventing audio noise generation by anticipating potential transmission issues before they occur.
Solution Approach 2:
The system continuously monitors the interface state through detection devices that measure voltage levels, clock signal presence, and error rates. This feedback mechanism allows the mute control device to dynamically adjust the audio signal transmission based on real-time interface conditions, muting the audio when transmission quality deteriorates and restoring it when conditions improve.
2Object-affected harmful factors
If the audio signal is muted to eliminate noise, then audio noise is reduced, but the audio output is interrupted during transient interface issues
Solution Approach 1:
The mute control device dynamically adjusts the audio signal based on real-time detection of interface state. Rather than a static mute/unmute decision, the system continuously adapts the audio output according to changing interface conditions, maintaining audio continuity when possible and applying mute only when necessary to eliminate noise.
Solution Approach 2:
The system monitors multiple interface parameters (voltage level, clock signal presence, error rate) and changes the audio output state based on combinations of these parameters. By considering multiple parameters rather than a single threshold, the system can distinguish between transient issues that should not trigger mute and persistent problems that warrant audio interruption.
3Object-affected harmful factors
If detection devices are added to monitor interface state, then audio noise control is improved, but device complexity increases
Solution Approach 1:
The detection device performs multiple detection functions using a unified structure. It simultaneously monitors voltage level, clock signal presence, and transmission error rate, and uses this information for both audio noise control and video signal management. This multi-functionality reduces the need for separate detection circuits for each parameter.
Solution Approach 2:
The mute control device is integrated with the existing video signal processing path in the digital interface receiver. The detection and control functions are merged into the existing architecture rather than adding completely separate systems, reducing overall device complexity while maintaining effective audio noise control.
Data Source
AI summary
An audio controlling device generates an audio mute signal based on the level of a power-supply voltage supplied from the source equipment, whether a clock signal has been input or not, whether a digital signal has been input or not, whether a multiplier circuit is being locked or not, an error rate, whether an audio clock detection circuit is being locked or not, the presence or absence of a change in a control signal, and whether a synchronization detection circuit is stable or not. The audio controlling device applies the audio mute signal to an audio mute circuit, while applying an OSD control signal to an OSD processing circuit. The audio mute circuit is placed in a mute state or unmute state based on the audio mute signal. The OSD processing circuit provides the on-screen display of a message based on the OSD control signal.