Solution background introduction:
With the development of recording and broadcasting, more and more customers have a clear demand for high-definition video. The new Intel CPU has been able to better support high-definition video, and high-definition cameras are gradually gaining more applications and prices are getting lower and lower. Signal transmission has become the biggest problem in the development of high-definition recording and broadcasting. In the past, component signals could be transmitted through 3 coaxial cables. However, because component signals are analog signals, long-distance transmission can cause blurred screens and even water ripples and ghosting. HDMI is also a commonly used interface for high-definition. HDMI can transmit high-definition pictures without loss, but generally can only transmit 20-30 meters, and the cable is more expensive. Using an HDMI extender will increase costs and reduce system reliability. The SDI interface in HD signal transmission can solve the above problems well. The SDI interface has been widely used in the field of broadcasting and television, digital transmission, and supports embedded audio. SDI is a digital signal transmitted through a 75 Ohms coaxial cable. This cable is widely used in the cable TV industry and is easy to buy. 1080p60 can transmit 100m, and 1080i60 can transmit more than 200m. At present, PTZ conference cameras commonly used in the recording and broadcasting industry generally have SDI interfaces. Mid-range cameras from SONY / Panasonic / Canon also generally have an SDI interface.
Scheme system architecture diagram:
In response to the needs of high-definition recording and playback, Miffy launched the M1500 integrated HD audio and video capture card, which can simultaneously capture 2 SDI and 1 universal HD video signals. The SDI signals fully support the SD / HD / 3G standard, and SDI can embed audio 1 channel DVI-I universal HD video signal supports VGA, DVI, HDMI, component, CVBS signal input, VGA capture has the best automatic resolution judgment and picture automatic adjustment engine and rich video processing functions in the industry, and the captured picture Clear, automatic detection of dynamic switching of various resolutions. The host interface adopts PCI Express x4, and the actual transmission rate can reach 600-800MB / s. Miffy M1500 integrated high-definition audio and video acquisition card completes 2 SDI HD signals and 1 VGA signal acquisition on one card. Compared with multi-card sharing, it effectively reduces user costs, greatly improves system reliability, and simultaneously collects 3 The high-definition signal power consumption is only 8W, which effectively reduces system power consumption and consumes low CPU rate. Image processing such as scaling and de-interlacing that consumes CPU time is completed in the FPGA, which greatly reduces the burden on the CPU and enables efficient DMA transfer. This approach further frees the CPU's capabilities, allowing the CPU to focus on the work specified by the user.