Chapter 1 How to choose the signal line
First, what signal lines will be needed in ordinary home audio and video systems?
Since it has been positioned as "home", things like the balance line and the Canon equipment are not covered here.
In today's mainstream audio and video systems, we often use these signal lines:
Audio/video signal: HDMI cable
Audio signal: digital fiber line, digital coaxial line, analog audio line
Video signal: Component Video color difference / component line, S-Video S terminal line, Composite Video composite video line
Second, in different use occasions, how to choose these wires?
1. Transmit audio signal: HDMI > Fiber / Coaxial > Analog audio signal line
HDMI has a larger bandwidth and can transmit HD audio signals; fiber/coaxial can only transmit ordinary digital audio signals; and ordinary analog audio signals are susceptible to interference and poor transmission.
(Is enthusiasts please do not question me on this issue, this article is for ordinary users, for home audio and video systems, not HiFi system; the text refers to the "ordinary analog audio signal line" also refers to the red and white lines. Thank you!)
2. Transmission video signal: HDMI > Component color difference / component signal line > S-Video signal line > Composite composite video signal line
HDMI: Support 1080P full HD format;
Component Video color difference signal line: up to 720P HD format;
S-Video: only supports 480i
Composite Video composite signal line: only supports 240 lines of sharpness
Third, transmit video signals, connect different devices, what wire is preferred
1, Blu-ray player / PS3 / HD player / HTPC - Amplifier / TV / projector: HDMI
2, DVD player - amplifier / TV / projector: HDMI or color difference
3, HD TV set-top box - full HD TV (1080P): HDMI
4, ordinary TV set-top box - HDTV (720P): color difference (if there is no color difference interface, you can also choose S-Video)
Fourth, transmit audio signals, connect different devices, what wire is preferred
1, Blu-ray player / PS3 / HD player / HTPC - Amplifier: HDMI
2, DVD player - amplifier: HDMI / fiber / coaxial
3, HD TV set-top box - full HD TV: HDMI
4, ordinary TV set-top box - TV: two analog audio signal lines
Chapter 2 Common Home Theater Signal Line Classification and Connection Usage
First, HDMI signal line
Nature: digital signal line
Uses: Simultaneous transmission of video signals and audio signals
At present, the most standard and the most convenient connection method for mainstream equipment: source device (Blu-ray player, DVD player, HTPC, HD player) - HDMI cable - Amplifier - HDMI cable - TV / projector
1. Why choose HDMI signal cable?
a, HDMI signal line can transmit video and audio signals simultaneously
b, HDMI version 1.3 signal line can transmit 1080P full HD signal
2, recognize the HDMI signal line
The HDMI signal line on the market generally has two shapes: a flat wire body and a round wire body. The shape does not represent the quality of the signal line itself.
3. Improved form of HDMI connector
Because there are 19 signal lines inside HDMI, the HDMI signal line with better quality is also relatively thick, and it is not easy to turn when plugging in the power amplifier and TV.
The manufacturer naturally noticed this small problem, so it launched a timely product - the HDMI connector with a corner
Some manufacturers simply launched an HDMI signal cable with an active connector.
4. How to see the quality of the HDMI connector?
Looking at the connector below, can you see what is different?
Obviously, the joint on the left side is deep, the true copper contact end; and the joint on the right side is shallow, apparently iron-plated. The joint on the right side takes a little longer and will show significant oxidation, and the coating will soon be worn away.
But also pay attention: some cottage lines are more than enough in appearance, but the interior is still relatively garbage, the shielding layer is seriously shrunk.
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