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參數(shù)資料
| 型號： | BD3860K |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Built-in BBE Audio sound controller |
| 中文描述： | 內(nèi)置BBE的Audio聲音控制器 |
| 文件頁數(shù)： | 20/27頁 |
| 文件大?。?/td> | 295K |
| 代理商： | BD3860K |
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BD3860K
Audio ICs
20/26
The resistance R1 is used to set for attenuation of main volume at loudness ON. The resistance R1 should be the same
6.8k
with inside resistance 6.8k
(Typ.) of main volume
30dB tap at loudness OFF. Except this value, the attenuation
of main volume at loudness ON is wrong. In the low frequency fully less than “fcl”, the voltage gain is fixed on 14dB (Typ.)
by inside constant at attenuation
30dB of main volume. The resistance R2 and the capacitor C2 are used to set for the
characteristic in high frequency range. The voltage gain in high frequency range can be changed by the value of R2 like
the upper figure.
10
40
10
20
30
+
0
0dB
20dB
30dB
40dB
10dB
100
50
500 1k
5k 10k
100k
f(Hz)
MAIN VOLUME
A
VCC
=
9V, VIN
=
1Vrms
C1
=
0.1
F, R1
=
6.8k
C2
=
470pF, R2
=
200k
Fig.11 Loudness gain-frequency (reference)
characteristics
BBE
ΙΙ
explanation of operation
BBE
ΙΙ
is a system. This processor treats a loudspeaker and amplifier as an integrated sound system and it exactly
reproduces the “rising edge of sound”, which characterizes the sound, though appropriate signal processing at a front
stage of amplifier input. This mechanism generates the playback sound almost like natural sound.
(1) Problem of sound playback in sound playback system
In the nature world, treble harmonics are produced first usually and then basic low-frequency wave is generated. This is
the same with an attacking part which characterizes various kinds of sounds of musical instruments. The character of
sound is expressed by the frequency upon rising edge of sound and the amplitude which forms an envelope. Therefore, it
is very important to express the rising edge of natural sound exactly upon reproducing the sound through sound playback
system. In the sound playback system of today, however, and unavoidable mismatch is made between a loudspeaker
and amplifier.
A transistor power amplifier operates as a constant voltage source because of negative feedback technology, while a
loudspeaker is a current device. Therefore, an unavoidable mismatch is made in the system. Moreover, the impedance
characteristic of loudspeaker various considerably depending on electric reactance of voice coil or mechanical reactance
of cone assembly. As a result, the rising edge of sound is distorted and a phase of playback sound is deflected.
Furthermore, increased treble impedance reduces the loudspeaker amplitude and harmonics. Therefore, treble
constituent is easy to masked by subsequent high-level middle range constituent and the rising edge of sound becomes
to hard to be reproduced so exactly.
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