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TDA7407D

14/34

Figure 9. Softmute Timing

of demuting.

6.2

BASS

There are four parameters programmable in the bass stage: (see figs 10, 11, 12, 13):

6.2.1 Attenuation

Figure 10 shows the attenuation as a function of frequency at a center frequency at a center frequency of 80Hz.

6.2.2 Center Frequency

Figure 11 shows the four possible center frequencies 60,70,80 and 100Hz.

6.2.3 Quality Factors

Figure 12 shows the four possible quality factors 1, 1.25, 1.5 and 2.

6.2.4 DC Mode

In this mode the DC gain is increased by 5.1dB. In addition the programmed center frequency and quality

factor is decreased by 25% which can be used to reach alternative center frequencies or quality factors.

6.3

MID

There are 3 parameters programmable in the mid stage (see figs. 14, 15 & 16)

6.3.1 Attenuation

Figure 14 shows the attenuation as a function of frequency at a center frequency of 1kHz.

6.3.2 Center Frequency

Figure 15 shows the four possible center frequencies 500Hz, 1kHz, 1.5kHz and 2kHz.

6.3.3 Quality Factor

Figure 16 shows the two possible quality factors 1 and 2 at a center frequency of 1kHz.

1

EXT.

MUTE

+SIGNAL

REF

-SIGNAL

1

I

OUT

Time

D97AU634

Note: Please notice that a started Mute action is always terminated and could not be interrupted by a change of the mute signal.

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Product(s)

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