HDMI Transmitter Audio Clock Signal Reconstruction
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Solution Overview
Problem
The complexity of circuitry in receiving terminals for HDMI interfaces leads to increased area and potential audio errors, resulting in burst sounds due to incorrect reconstruction of the audio clock signal.
Innovation Solution
An electronic device with a receiving unit, signal processing unit, and audio timing unit generates a pixel clock signal and cycle time stamp, allowing the receiving terminal to accurately reconstruct the audio clock signal, reducing errors and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving terminal uses frequency divider and frequency multiplier to reconstruct audio clock signal, then the audio clock signal can be generated, but the circuit area increases and complexity increases
Solution Approach 1:
The patent extracts the audio clock signal reconstruction function from the receiving terminal and relocates it to the transmitting terminal. The transmitting terminal generates the audio clock signal using its own pixel clock signal and sends it directly to the receiving terminal, eliminating the need for frequency dividers and multipliers at the receiving end. This reduces circuit complexity while maintaining reconstruction accuracy.
Solution Approach 2:
The patent introduces an intermediary approach where the transmitting terminal acts as a mediator that pre-processes the audio clock signal. Instead of requiring the receiving terminal to perform complex frequency division and multiplication operations, the transmitting terminal generates and transmits the ready-to-use audio clock signal, simplifying the receiving terminal's circuitry.
2Reliability
If the receiving terminal uses frequency divider and frequency multiplier to reconstruct audio clock signal, then the audio clock signal can be generated, but the circuit area increases
Solution Approach 1:
The patent removes the frequency divider and frequency multiplier circuits from the receiving terminal by relocating the audio clock signal generation function to the transmitting terminal. This extraction eliminates the need for additional circuit components at the receiving end, directly reducing circuit area while maintaining signal reconstruction accuracy.
3Ease of operation
If the audio clock signal is reconstructed incorrectly at the receiving terminal, then burst sound occurs, but the complexity of ensuring correct reconstruction increases
Solution Approach 1:
The patent applies preliminary action by having the transmitting terminal generate the audio clock signal in advance using its pixel clock signal before transmission. This pre-generation ensures the signal is correctly formed at the source, eliminating the need for complex reconstruction operations at the receiving terminal and preventing burst sounds while simplifying the overall system.
4Adaptability or versatility
If the receiving terminal regenerates audio clock signal from pixel clock signal, then audio data can be played, but errors may accumulate leading to burst sound
Solution Approach 1:
The patent extracts the audio clock signal generation function from the receiving terminal and places it at the transmitting terminal. This eliminates the error-prone regeneration process at the receiving end, as the audio clock signal is now generated directly from the pixel clock signal at the source where errors cannot accumulate, ensuring high reliability while maintaining playback capability.
Data Source
AI summary
An electronic device includes a receiving unit, a signal processing unit, a transmitting unit, and an audio timing unit. The receiving unit receives audio data and first video data. The signal processing unit generates second video data and a pixel clock signal for playing the second video data according to the first video data. The transmitting unit transmits the second video data, the audio data, the pixel clock signal, and a cycle time stamp (CTS) to a receiver. The audio timing unit generates an internal reference signal adjusts a frequency of the internal reference signal according to a receiving speed of the audio data, and generates the CTS according to the internal reference signal and the pixel clock signal so that the receiver can generate an audio clock signal for playing the audio data according to the pixel clock signal and the CTS.