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

7.1.5. Loudness Loudspeaker and Headphone

Channel

Loudness

loudspeaker

Loudness

headphone

+17 dB

+16 dB

+1 dB

0 dB

0004hex

H

0033hex

H

0100 0100

0100 0000

0000 0100

0000 0000

RESET

44hex

40hex

04hex

00hex

Mode Loudness

loudspeaker

Mode Loudness

headphone

Normal (constant

volume at 1 kHz)

Super Bass (constant

volume at 2 kHz)

0004hex

L

0033hex

L

0000 0000

RESET

0000 0100

00hex

04hex

Loudness increases the volume of low and high frequen-

cy signals, while keeping the amplitude of the 1 kHz ref-

erence frequency constant. The intended loudness has

to be set according to the actual volume setting. Be-

cause loudness introduces gain, it is not recommended

to set loudness to a value that ,in conjunction with vol-

ume, would result in an overall positive gain.

By means of ‘Mode Loudness’, the corner frequency for

bass amplification can be set to two different values. In

Super Bass mode, the corner frequency is shifted up.

The point of constant volume is shifted from 1 kHz to

2 kHz.

7.1.6. Spatial Effects Loudspeaker Channel

Spatial effect strength

loudspeaker channel

Enlargement 100%

Enlargement 50%

Enlargement 1.5%

Effect off

Reduction 1.5%

Reduction 50%

Reduction 100%

Spatial Effect Mode

Stereo Basewidth En-

largement (SBE) and

Pseudo Stereo Effect

(PSE). (Mode A)

Stereo Basewidth En-

largement (SBE) only.

(Mode B)

Spatial Effect Cus-

tomize Coefficient

max high pass gain

2/3 high pass gain

1/3 high pass gain

min high pass gain

automatic

0005hex

0111 1111

0011 1111

0000 0001

0000 0000

RESET

1111 1111

1100 0000

1000 0000

0005hex

0000

RESET

0000

0010

0005hex

0000

RESET

0010

0100

0110

1000

H

7Fhex

3Fhex

01hex

00hex

FFhex

C0hex

80hex

[7:4]

0hex

0hex

2hex

[3:0]

0hex

2hex

4hex

6hex

8hex

There are several spatial effect modes available:

Mode A (low byte = 00hex) is compatible to the formerly

used spatial effect. Here, the kind of spatial effect de-

pends on the source mode. If the incoming signal is in

mono mode, Pseudo Stereo Effect is active; for stereo

signals, Pseudo Stereo Effect and Stereo Basewidth

Enlargement is effective. The strength of the effect is

controllable by the upper byte. A negative value reduces

the stereo image. A rather strong spatial effect is recom-

mended for small TV sets where loudspeaker spacing is

rather close. For large screen TV sets, a more moderate

spatial effect is recommended. In mode A, even in case

of stereo input signals, Pseudo Stereo Effect is active,

which reduces the center image.

In Mode B, only Stereo Basewidth Enlargement is effec-

tive. For mono input signals, the Pseudo Stereo Effect

has to be switched on.

34

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