HA12231FP(2001) View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

HA12231FP
(Rev.:2001)

Audio Signal Processor for Car Deck (PB 1 Chip)

Renesas Electronics 

HA12231FP

1. Search mode

GV1 = (23.5dB − 3.5dB) + 20log

1+

90k

REX2

[dB]

f1 =

1

2π ⋅ CEX2 ⋅ REX2

[Hz], f2 = 25k [Hz]

2. Repeat mode

GV2 = (23.5dB − 3.5dB) + 20log

1+

90k

REX1

[dB]

f3 =

1

2π ⋅ CEX1 ⋅ REX1

[Hz], f4 = 25k [Hz]

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

S = 12.7 − GV [dB]

S is 6 dB down in case of one-side channel.

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

REX1, 2

Search mode 24 kΩ

CEX1, 2

0.01 µF

G

V1, 2

33.5 dB

f

1, 3

663 Hz

f

2, 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: This MS presented hysteresis lest MS(OUT) 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 C1, 0.01 µF to 1 µF capacitor C1 can be

applicable.

2. Sensing signal to no signal (Recovery) is determined by C1 and R1, however preceding (1), 100 kΩ to 1

MΩ can be applicable.

Music Sensor Output (MS(OUT))

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 − MS(OUT)LO*

RL

* MS(OUT)LO : Sensing signal (about 1V)

Note: Supply voltage of MS(OUT) pin must be less than VCC voltage.

Rev.1, Jan. 2001, page 12 of 12

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