Core question 1: What is the voice control card?

This thing is not an ordinary remote control! Simply put​ ​Black technology module that allows LED screens to understand human words​ ​. It has to do three things at the same time:

• ​​Turn the sound into control commands​ ​(For example, if you say "brighten a little", it must analyze the voiceprint characteristics to prevent accidentally touching)
• ​​Cooperate with the main control card​ ​(Transfer commands via RS485 or network port)
• ​​Ambient noise filtering​ ​(The noise coming and going in the mall cannot interfere with the command)

​​Important parameters​ ​: Must be sure to support it​ ​6 microphone array​ ​The model has a sound pickup radius of up to 8 meters. Last year, a bargain packed in a hot pot restaurant, but the customer called "add soup" to turn the screen volume to the maximum, and the scene was out of control for a while...

Core question 2: Installation location competition

Where is the most reliable to pretend? Let's use actual data to speak:

Real-person test case: A gym installed a control card on the roof of a dynamic bicycle, and as a result, each bicycle became a radio. The coach shouted a command and made the screen cut the song wildly——​ ​Later, it was changed to distributed installation, and each area was equipped with a separate card to stop.​​。

Core question 3: These scenarios must be installed

​​I regret not pretending to be accurate in three situations​​：

1. ​​Shopping mall atrium with huge traffic​ ​: When the background noise exceeds 65 decibels, ordinary infrared remote control is not easy to use
2. ​​Large command screen installed at high altitude​ ​: Above 10 meters, it must be used​ ​Wind noise-resistant model​ ​, the regular version will be disturbed by the wind
3. ​​Multi-room exhibition hall​ ​: Each partition must be independently voice-controlled, and the main cartridge cannot move so many commands

The smartest design I have ever seen: a certain car 4S store installed a voice card on the screen in the test drive area. When the customer said "accelerated", the roar of the engine was played, and the transaction rate increased by 20% directly!

Core Issue 4: Installation Pit Avoidance Guide

Remember these three things can save 10,000 yuan in maintenance costs:

1. ​​Power supply must be independent​ ​: Never share circuits with audio, current sound will make you doubt your life
2. ​​Avoid metal frames​ ​: The aluminum alloy frame will cut the sound pickup distance by half, leaving at least 30cm of space
3. ​​Moisture-proof and high temperature protection​ ​: Silicone sealing ring must be installed if the humidity exceeds 70%, and heat sink must be added if the temperature exceeds 50℃.

​​Lessons of blood and tears​ ​: There is a swimming pool that has installed the control card by the pool. Three months later, the circuit board is covered with green hair. The maintenance master said it looks like he has entered the aquarium!

Core question 5: Debugging skills are revealed

Don't rush to use it after installing it! These three steps must be done:

1. ​​Sound field calibration​ ​: Use a professional decibel instrument to test in 8 directions to ensure that the blind spots do not exceed 10%
2. ​​Command library update​ ​: Import local dialect packages (for example, Cantonese recognition rate is 15% lower than that of Mandarin)
3. ​​Emergency blocking words​ ​: Set voice lock for dangerous commands such as "shutdown", "formatting"

There is a kindergarten case that makes people laugh: the child shouts "turns red" every day, but the red lamp beads are scrapped six months in advance——​ ​Later, the number of instructions was restricted to resolve​​。

Now I understand why some screens are "back of the ears"? Choosing the right location is more important than buying expensive cards. remember​ ​The sound pickup angle should cover the main activity area, and the installation height should be 30cm up and down at the human mouth position.​ ​. Next time I see someone who is calling to the air to adjust the screen, I must have not read this article!

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