MSP3400CPP 查看數據表（PDF） - Micronas

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产品描述 (功能)

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MSP3400CPP

Multistandard Sound Processor

Micronas 

MSP 3400C

PRELIMINARY DATA SHEET

7.1.23. Subwoofer on Headphone Output

The subwoofer channel is created by combining the left

and right loudspeaker channels ( (L+R)/2 ) directly be-

hind the tone control filter block. A third order lowpass fil-

ter with programmable corner frequency and volume ad-

justment respectively to the loudspeaker channel output

is performed to the bass-signal. Additionally, at the loud-

speaker channels, a complementary high pass filter can

be switched on. The subwoofer channel output can be

switched to the headphone D/A converter alternatively

with the headphone output.

7.2. Exclusions

In general, all functions can be switched independently

of the others. One exception exists:

1. If the adaptive deemphasis is activated (Reg. 000fhex

L), the FM fixed deemphasis (Reg. 000fhex H) must be

set to 75 µs.

Subwoofer Channel

Volume Adjust

0 dB

–1 dB

–29 dB

–30 dB

Mute

002Chex

0000 0000

RESET

1111 1111

1110 0011

1110 0010

1000 0000

H

00hex

FFhex

E3hex

E2hex

80hex

Subwoofer Channel

Corner Frequency

50 Hz .... 400 Hz

e.g. 50 Hz = 5 int

400 Hz = 40int

Headphone Output

Headphone

Subwoofer

Subwoofer: Comple-

mentary Highpass

HP off

HP on

002Dhex

0000 0101

0010 1000

002Dhex

0000

1000

002Dhex

0000

0001

H

05hex

28hex

[7:4]

0hex

8hex

[3:0]

0hex

1hex

Note: If subwoofer is chosen for headphone output, the

corner frequency must be set to the desired value, be-

fore the loudspeaker volume is set. This is to avoid plop

noise.

40

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