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BA1701 Fiches technique(PDF) 5 Page - Rohm |
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BA1701 Fiches technique(HTML) 5 Page - Rohm |
5 / 9 page 865 Audio ICs BA1701 FCircuit operation (1) System construction The BA1701 is a monolithic audio-compression system controller IC that uses VSC.When used in combination with an analog delay circuit, low-pass filter, and tape speed controller, it can replay recorded audio at 1 to 2.5 times the recording speed, without altering the pitch (see Fig. 3). The BA1701 has a built-in motor driver control circuit that is synchronized with the pitch control that allows the sys- tem to be built with just one pitch control potentiometer (see Fig. 4). (2) Principles of audio compression (see Fig. 5) When recorded audio (A) is replayed at high speed, the pitch of the audio increases in proportion to the playback speed (B). By expanding this using an analog delay cir- cuit, a compressed audio signal with the same pitch as the original recorded signal is obtained (C). Partial audio dropout occurs when the audio is expanded, but due to the diffuse nature of speech, the expanded audio does not sound unnatural to the human ear. |
Numéro de pièce similaire - BA1701 |
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Description similaire - BA1701 |
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