HA12229F データシートの表示（PDF） - Renesas Electronics

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HA12229F

Audio Signal Processor for Car Deck (Decode only Dolby B-type NR* with PB Amp.)

Renesas Electronics 

HA12228F/HA12229F

1. Search mode

GV1 = 20dB + 20 log

1+

90k

REX2

[dB]

f1 =

1

2π ⋅ CEX2 ⋅ REX2

[Hz], f2 = 25k [Hz]

2. Repeat mode

GV2 = 20dB + 20 log

1+

90k

REX1

[dB]

f3 =

1

2π ⋅ CEX1 ⋅ REX1

[Hz], f4 = 25k [Hz]

GVIA: L·R signal addition circuit gain.

The sensitivity of music sensor (S) is computed by the formula mentioned below.

S=−

GV*1

−

20

log

130*3

30*2

= 12.7 − GV

[dB]

Notes: 1. Search mode: GV1, Repeat mode: G V2

2. Standard level of TAI pin (Dolby level correspondence) = 30 mVrms

3. Standard sensing level of music sensor = 130 mVrms

Item

Search mode

REX1, 2

24 kΩ

CEX1, 2

0.01 µF

GV1, 2

33.5 dB

f1, 3

663 Hz

f2, 4

25 kHz

S (one side

channel)

–14.8 dB

S (both

channel)

–20.8 dB

Repeat mode 2.4 kΩ

1 µF

51.7 dB

66.3 Hz

25 kHz

–33.0 dB

–39.0 dB

Note: S is 6 dB down in case of one-side channel. And this MS presented hysteresis lest MSOUT terminal should turn

over again High level or Low level, in case of thresh S level constantly.

Music Sensor Time Constant

1. Sensing no signal to signal (Attack) is determined by C6, 0.01 µF to 1 µF capacitor C6 can be applicable.

2. Sensing signal to no signal (Recovery) is determined by C6 and R11, however preceding (1), 100 kΩ to 1 MΩ can

be applicable.

Music Sensor Output (MSOUT)

As for the internal circuit of music sensor block, music sensor output pin is connected to the collector of NPN type

directly, therefore, output level will be “high” when sensing no signal. And output level will be “low” when sensing

signal.

IL =

DVCC − MSOUTLO*

RL

* MSOUTLO : Sensing signal (about 1V)

Note: 1. Supply voltage of MSOUT pin must be less than VCC voltage.

Rev.2.00 Jun 15, 2005 page 12 of 48

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