TDA7412 datasheet(20/56 Pages) STMICROELECTRONICS

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TDA7412

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1.12 Subwoofer

Several different applications are possible with the Subwoofer-circuit:

1. Subwoofer-Filter OFF

a. Main-source stereo (AC-coupled)

b. Second-source stereo (DC-coupled)

c. Main-source mono-differential (DC-coupled)

d. Second-source mono-differential (DC-coupled)

2. Subwoofer-Filter ON

a. Main-source mono-differential (DC-coupled)

b. Second-source mono-differential (DC-coupled)

c. Center-Speaker-Mode (filtered mono signal at SWL, unfiltered mono signal at SWR)

In all applications the phase of the output-signal can be configured to be 0° or 180° . In the Center-Speaker-

Mode only at the filtered output the phase is changed.

Figure 16. Application1 using internal Highpass- and mono Low-pass-Filter

VOICE BAND

BANDPASS

BASS-FILTER

LOWPASS

220nF

MS MONO

MAIN SOURCE

RIGHT CHANNEL

MAIN SOURCE

SPEAKER FRONT

SWIN

ACINR

ACINF

OFF/ON

ACOUT

SPEAKER REAR

SPEAKER SUBWOOFER

D00AU1156

LEFT CHANNEL

SECOND SOURCE

25K

50K

25K

SEC.S MONO

PROGRAMMING

5/1xxxxxxx

7/xxxxx1xx

10/xxxx10xx

12/1010xxxx

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