TDA7407 datasheet(23/46 Pages) STMICROELECTRONICS

23 / 46 page

TDA7407

Multipath detector

23/46

5.1.8

Attenuation (80Hz)

Figure 9 shows the attenuation as a function of frequency at a center frequency of 80Hz.

5.1.9

Center frequency (60, 70, 80, 100Hz)

Figure 10 shows the four possible center frequencies 60,70,80 and 100Hz.

5.1.10

Quality factors (1, 1.25, 1.5, 2)

Figure 11 shows the four possible quality factors 1, 1.25, 1.5 and 2.

5.1.11

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. (see Figure 12)

5.1.12

MID

There are 3 parameters programmable in the mid stage (see figures13, 14 and 15)

5.1.13

Attenuation (1kHz)

Figure 13 shows the attenuation as a function of frequency at a center frequency of 1kHz.

5.1.14

Center frequency (500, 1k, 1.5k, 2k Hz)

Figure 14 shows the four possible center frequencies 500Hz, 1kHz, 1.5kHz and 2kHz.

5.1.15

Quality factor (2 at 1kHz)

Figure 15 shows the two possible quality factors 1 and 2 at a center frequency of 1kHz.

5.1.16

Treble

There are two parameters programmable in the treble stage (see figures 16, and17):

5.1.17

Attenuation (17.5kHz)

Figure 16 shows the attenuation as a function of frequency at a center frequency of

17.5KHz.

5.1.18

Center frequency (10, 12.5, 15, 17.5kHz)

Figure 17 shows the four possible Center Frequency (10, 12.5, 15 and 17.5kHz).

5.1.19

AC coupling

In some applications additional signal manipulations are desired, for example surround

sound or more band equalizing. For this purpose AC Coupling is placed before the speaker

attenuators, which can be activated or internally shorted by Bit7 in the Bass/Treble

configuration byte. In short condition the input signal of the speaker attenuator is available at

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