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The BBC-Marconi Type A was a ribbon microphone that was produced by the BBC and Marconi between 1934 and 1959. The microphone has been described as "iconic" and a symbol of the BBC, and has become an interface metaphor for sound recording.〔 == History == In the early 1930s, the BBC became aware of RCA's model 44 ribbon microphone that was used in Hollywood.〔 Each pair of microphone and amplifier would have cost the BBC £130 (approximately £6,500 in 2009〔Based on a retail price index calculation ()〕).〔 As this was not within the BBC's budget, they designed their own microphone, the Type A, alongside Marconi. There were initial concerns that the new design infringed the patent of the RCA microphone, but these were overcome.〔 The Type A was produced at a cost of £9 each (approximately £475 in 2009〔).〔 The original Type A microphone was designed by engineer F W Alexander under the guidance of H L Kirke's Research Department at the BBC. In 1940, the Type A was used in the broadcast of Charles de Gaulle's 1940 appeals.〔 In the early 1950s, the BBC began to design the Type A's successor. The first model was the pressure gradient PGD design.〔 In 1953, production began on the PGS (pressure gradient single) ribbon microphone in agreement with Standard Telephones and Cables (STC). In the mid-1970s, STC's manufacturing was transferred to Coles Electroacoustics, who continue to manufacture the PGS under the model number 4038.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BBC-Marconi Type A microphone」の詳細全文を読む スポンサード リンク
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