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BA1701 Fiches technique(PDF) 5 Page - Rohm

No de pièce BA1701
Description  VSC system processor IC
Download  9 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BA1701 Fiches technique(HTML) 5 Page - Rohm

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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.


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