What is the control level of crosstalk, noise and other parameters of HDMI matrix 8 in 8 out?
Publish Time: 2024-11-28
HDMI matrix 8 in 8 out plays a key role in audio and video systems, responsible for switching multiple audio and video signal sources to multiple displays or speakers. Its performance indicators, especially parameters such as crosstalk and noise, directly affect the transmission quality of audio and video signals and the overall performance of the system.1. CrosstalkDefinition: Crosstalk refers to the unwanted interference signal generated by the signal transmitted in one signal channel in other signal channels. In HDMI matrix 8 in 8 out, crosstalk is mainly manifested as a signal leaking from one output channel to another output channel.Control method:Electromagnetic shielding: Use high electromagnetic shielding materials and designs to reduce electromagnetic interference between different signal channels.Independent channel design: Optimize circuit layout and design to ensure the independence of each signal channel and reduce signal leakage.Isolation transformer: Use isolation transformers in key circuit parts to effectively isolate different signal channels and reduce crosstalk.High impedance input and output: Use high impedance input and output design to reduce mutual influence between signals.Performance indicators: usually expressed in dBc (decibels relative to the carrier), the larger the value, the better the crosstalk control. The crosstalk of high-performance HDMI matrix 8 in 8 out is usually controlled below -60dBc.2. NoiseDefinition: Noise refers to the unwanted random interference signal introduced during signal transmission, including thermal noise, stray noise and power supply noise.Control method:Low noise design: Use low noise amplifier and low noise power supply design to reduce system internal noise.Filter: Use high-quality filters in key circuit parts to effectively filter out high-frequency noise and power supply noise.Shielding and grounding: Use good shielding and grounding design to reduce external electromagnetic interference and internal noise.High-quality components: Use high-quality components such as resistors, capacitors and transistors to reduce noise sources.Performance indicators: usually expressed in signal-to-noise ratio (SNR), the larger the value, the better the noise control. The signal-to-noise ratio of high-performance HDMI matrix 8 in 8 out is usually above 70dB.3. Signal IntegrityDefinition: Signal integrity refers to the fact that the amplitude, phase, frequency and other characteristics of the signal remain unchanged during transmission without distortion, attenuation or interference.Control method:High-speed transmission technology: Use high-speed transmission technology and high-bandwidth design to ensure that the signal remains intact during high-speed transmission and switching.Impedance matching: Ensure impedance matching of input and output ports to reduce signal reflection and distortion.Equalization and compensation: Use equalization and compensation technology in signal processing circuits to effectively compensate for signal attenuation and distortion during transmission.High-precision clock: Use high-precision clock source to ensure synchronization and stable transmission of signals.Performance indicators: Usually expressed in terms of eye diagram and bit error rate (BER). The larger the eye diagram opening and the lower the bit error rate, the better the signal integrity.4. IsolationDefinition: Isolation refers to the degree of isolation between signals in different signal channels, usually including power isolation and signal isolation.Control method:Photoelectric isolation: Use photoelectric isolation technology between key signal channels to effectively isolate different signal channels.Isolation amplifier: Use isolation amplifier in signal processing circuit to improve the isolation between signal channels.Power isolation: Use power isolation design to reduce power interference between different signal channels.Performance index: Usually expressed in dB, the larger the value, the better the isolation. The isolation of high-performance HDMI matrix 8 in 8 out is usually above 60dB.In summary, HDMI matrix 8 in 8 out can achieve high-performance signal transmission and switching at the control level of parameters such as crosstalk and noise through high electromagnetic shielding, independent channel design, low noise design, filter, shielding and grounding, high-speed transmission technology, impedance matching, equalization and compensation, photoelectric isolation and other methods.
