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The solar system The most special feature of this spacecraft that pursues the mission of the universe is that it carries a copper disk record with a 12-inch thick, gold-plated surface and a diamond phonograph needle. The content includes 55 human languages ​​and 115 images including four Chinese dialects such as Chinese Cantonese. Diamond has high Young's modulus and elastic modulus, which is convenient for high-frequency acoustic wave high-fidelity transmission. It is the ideal material for making high-frequency diaphragms for loudspeakers. 
The vast galaxy is known to have the highest sound transmission speed (C = 18.5km / s) and moderate internal damping factors, the diaphragm prepared with its film has excellent high-frequency response characteristics, and the material's HRF value is transmitted The speed of sound increases and increases to 63 kHz. The signal-to-noise ratio also increases with increasing sound velocity, while a high signal-to-noise ratio produces a clearer sound. Due to the large HRF of DF and DLC, it is the most ideal medium and high sound diaphragm material, which can be used to manufacture high-grade high-fidelity (Hi-Fi) acoustic devices. 
Space Detector - Voyager 1 Polycrystalline diamond coated ceramic diaphragm has also been used as a high frequency diaphragm for high-end stereo speakers. Polycrystalline diamond and SiC multilayer coated Al flakes are also being used as high frequency diaphragms for high-grade, high-fidelity stereo speakers with HRF values ​​varying from 35 kHz to 50 kHz depending on the DF/SiC multilayer structure. Japan Pioneer Electronics Co., Ltd. and Electric Works Co., Ltd. cooperated with 1989 to develop a high-frequency speaker diaphragm composed of diamond crystals to produce full-crystal DF diaphragms and speakers with diameters of 25mm and 68mm. The HRF value of the all-crystalline DF diaphragm is 63kHz. The SX1000 speaker system produced by Japan Victory in 1987 is very different from the SX1000LABO that was launched in 1990. In the diaphragm, the woofer is changed from a mixture of carbon fiber-reinforced plastic (CFRP) and paper to a foam layer. Or the CFRP mixture diaphragm of polypropylene, the middle sound unit is changed from a fine ceramic diaphragm into a three-layer pure fine ceramic diaphragm, and the tweeter unit is changed from a pure ceramic diaphragm to a pure diamond diaphragm. In short, the international DLC coating diaphragm is close to commercialization, and the DF diaphragm is still far from commercialization. The "letter" written to the extraterrestrial civilization was extended to a billion years later because of its unique diamond phonograph needle device. Away from the solar system, Voyager 1 will also carry the greetings of the Earth to the center of the Milky Way at a speed of 17 kilometers per second.
Recently, the NASA Jet Propulsion Laboratory issued a statement: The data sent back by the Voyager 1 Detector launched in 1977 showed that it had reached the edge of the solar system. If the transmission time is removed, the time for Voyager 1 to reach the edge of the solar system is May of this year.