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PDF HA12209F Data sheet ( Hoja de datos )
| Número de pieza | HA12209F | |
| Descripción | Audio Signal Processor for Cassette Deck(Dolby B-type NR with Recording System) | |
| Fabricantes | Hitachi Semiconductor | |
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HA12209F
Audio Signal Processor for Cassette Deck
(Dolby B-type NR with Recording System)
ADE-207-221A (Z)
2nd Edition
Jun. 1999
Description
HA12209F is silicon monolithic bipolar IC providing Dolby noise reduction system*, music sensor system,
REC equalizer system and each electronic control switch in one chip.
Functions
• Dolby B-NR × 2 channel
• REC equalizer × 2 channel
• Music sensor × 1 channel
• Each electronic control switch to change REC equalizer, bias, etc.
Features
• REC equalizer is very small number of external parts and have 4 types of frequency characteristics
built-in.
• 2 types of input for PB, 1 type of input for REC.
• 70µ-PB equalizer changing system built-in.
• Dolby NR with dubbing double cassette decks.
Unprocessed signal output available from recording out terminals during PB mode.
• Provide stable music sensor system, available to design music sensing time and level.
• Controllable from direct micro-computer output.
• Bias oscillator control switch built-in.
• NR ON/OFF and REC/PB fully electronic control switching built-in.
• Normal-speed/high-speed, TYPE I/TYPE II and PB equalizer fully electronic control switching built-in.
• Available to reduce substrate-area because of high integration and small external parts.
* Dolby is a trademark of Dolby Laboratories Licensing Corporation.
A license from Dolby Laboratories Licensing Corporation is required for the use of this IC.
1 page  
HA12209F
Pin Description, Equivalent Circuit (VCC=12V, Ta=25°C, No signal, The value in the
table show typical value.) (cont)
Pin No. Pin Name
29 MSDET
Note
I = 0µA
Equivalent Circuit
I
Pin Description
VCC Time constant
pin for MS *1
V
31 MSIN V = V / 2
CC
GND
VCC
MS input
33 MAI
V = VCC / 2
27
MSOUT
I = 0µA
V
100k
MAOUT
100k
VCC/2
VCC
V
45k
VCC/2
VCC
VI
MS amp. output
MS output (to
MPU)
Note: 1. MS : Music Sensor
DGND
Rev.2, Jun. 1999, page 5 of 49
5 Page 
The sensitivity of Music Sensor
Gv
HA12209F
f1 = 1 [Hz]
2π · C26 · 100k
f2 = 25k [Hz]
f1 f2
f
Figure 5 Frequency Characteristic of MSIN
Occasion of the external component of figure 4, f1 is 159Hz. A standard level of MS input pin
25.9mVrms, therefore, the sensitivity of music sensor (S) can request it, by lower formulas.
A = MS Amp Gain
B = PB input Gain × (1/2)*1
C = Sensed voltage
S = 20log C [dB]
25.9 · A · B
20log (A × B) = D [dB]
PB input Gain = 21.3 [dB]
S = 14 – D [dB]
Note: 1. Case of one-sided channel input.
Time Constant of Detection
Figure 6(1) generally shows that detection time is in proportion to value of capacitor C10. But, with
Attack*2 and Recovery*3 the detection time differs exceptionally.
Recovery
Attack
Recovery
Attack
Recovery
Attack
C10
Function Characteristic of MS (1)
R12
Detection level
Input level
Function Characteristic of MS (2) Function Characteristic of MS (3)
Figure 6 Function Characteristics of MS
Like the figure 6(2), Recovery time is variably possible by value of resistor R12. But Attack time gets
about fixed value. Attack time has dependence by input level. When a large signal is inputted, Attack time
is short tendency.
Note: 2. Attack : Non-music → Music
3. Recovery : Music → Non-music
Rev.2, Jun. 1999, page 11 of 49
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HA12209F.PDF ] | |
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