RCA invented the 45 rpm ‘single’ in 1949 which arrived in UK in the early 1950s Acoustic, pre-electric, recordings achieved a frequency range of up to 2,500Hz With the advent of electrical recordings in 1925, the frequency range increased to about 8,500Hz During the Second World War the Decca record company develop the FFRR (Full Frequency Record Response) which increased the frequency range to a remarkable 15,000 Hz from 1945. This was as a result of improving recording frequency range in records used to train SONAR operators during the war - underwater Radar used to spot German U Boats. All record companies began to adopt this standard after 1945. In the late 1950s Decca developed their system further for their new stereo records calling it FFSS - Full Frequency Stereo Sound With advent of the Long Playing record and 45 rpm ‘single’, the frequency range was extended to about 20,000Hz - the top of the range of human hearing This top hit for Dick Jordan in 1960 is played on
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