Answer: D, 4
Answer analysis:
First, we need to clarify several key information points mentioned in the question:
1. Box specifications: P16 outdoor box, the size is 1024mm*768mm*140mm, which is the physical size of the box.
2. Pixel pitch: Since the question directly mentions P16, the "P" here refers to the pixel pitch, that is, the center distance between each pixel. P16 means that the distance between each pixel is 16mm.
3. Resolution: Since the box size and pixel pitch are known, we can calculate the resolution of the box. The width of the box is 1024mm and the height is 768mm. Divided by the pixel pitch of 16mm, the resolution of the box is 64 pixels (1024/16) in width and 48 pixels (768/16) in height.
4. The role of the receiving card: The receiving card is mainly used to receive and process the signal from the control card, and then distribute it to each pixel on the LED display. The number of pixels and resolution it supports determines the number of receiving cards that need to be used.
Next, we analyze the options based on this information:
A, 2: In some cases, if the performance of the receiving card is strong enough, it can support the resolution of multiple cabinets, but usually factors such as signal attenuation and synchronization need to be considered. Without specific receiving card performance parameters, it cannot be directly determined.
B, 1: Considering that the resolution of each cabinet is 64*48 pixels, if the receiving card can support at least this resolution (or higher), then one receiving card can drive one cabinet. But whether four cabinets can be driven by one receiving card depends on the output capacity of the receiving card and whether additional distributors or cascade devices are required. However, under normal circumstances, one receiving card usually corresponds to only one cabinet, unless there is a special cascade or distribution technology.
C, 3: This option means that three receiving cards drive four cabinets, which is uncommon in conventional configurations, unless there are special configuration requirements or the receiving card has special cascade capabilities.
D, 4: This is the most intuitive and common configuration, that is, one receiving card corresponds to one cabinet. This ensures that the signal of each cabinet is independent and stable, and is easy to manage and maintain.
In summary, although options A and B may be true in some special cases, according to the general configuration and the information given in the question, the most reasonable answer is D, that is, four P16 outdoor cabinets each require a receiving card, and a total of 4 receiving cards are required.
Therefore, the correct answer is D, 4.