CCTV News:How does the space station in the vast space collect and transmit audio and video? Huang Jianqing, an expert from the Eighth Academy of China Aerospace Science and Technology Corporation, said: "The voice processor of the space station combines low-speed voice codec and high-speed audio codec, which is equivalent to a lower channel to transmit clearer voice. The delay of voice transmission can be controlled within one second, which is similar to making a phone call. Voice call can make real-time intercourse and intercommunication.