Thomas Edison's long playing disc was known as the Diamond Disc, and they had 450 grooves to the inch on each side of a 12 inch record which could play for 20 minutes, but they had lacked good tone and loudness. Then came the depression in1929 when Thomas Edison decided to closed down his phonograph business, this action left the Emil Berliner's shellac 78rpm to field the commerce market alone. During the 1930's various electric gramophones with pick-ups arms and could also be connected to a wireless that were manufactured, of all the gramophones that were manufactured, the portable acoustic gramophones became a popular choice that took over and sold quite well, even into the 1950's. Mid-1960's brought about the Compact Cassette (CC), originally developed in 1962 by the Philips Electronic Company presented as a transcript machine.
The Compact Cassette (CC) became the dominant force by taking over the market from the magnetic recording for the next two decades. Continual development of high fidelity technology and stereophonic records maintained interest in the LP vinyl discs but only for them and the Compact Cassettes (CC) to be put into near extinction by the Compact Discs (CD) digital recordings in the 1980's. While the Compact Disc (CD) does not have scratches or antistatic it is much more convenient to use, but vinyl's reproduces high frequency harmonics which the CD cannot reproduce. With the making of the Compact Discs (CDs), frequencies have to be above 20kHz (Kilohertz). On the CD surface noise disappeared in the digital era with digital "0" and "1" codes independent of any surface material. Sound quality on the Compact Disc is determined by sampling and bandwidth. |
