Kenwood Corporation is a Japanese manufacturer of amateur radio as well as Hi-Fidelity and portable audio equipment. The company first started in 1946 as the Kasuga Radio Co. Ltd. In Komagane City, Nagano Prefecture, Japan. Kenwood introduced Japan's first FM tuner and solid state amplifier. The company introduced an amplifier with integrated audio and video signal switching in 1981. This product is seen as a precursor to today's home cinema systems. In 1984, Kenwood designed and manufactured the first anti-theft car stereo receiver.