TDA7374 datasheet(10/13 Pages) STMICROELECTRONICS

10 / 13 page

CLIPPING DETECTOR

Fig 19 shows an application using the TDA7374B

in combination with the SGS-THOMSON audio-

processor TDA7302.

The output clipping is recognized by the microproc-

essor (in this application it is simulated by a PC).

The detailed way to operate of the system is rep-

resented by the flow-chart of fig.18.

The controller detects when the clipping is active

(minimun detection width fixed by a C29 = 12 nF

external capacitor), and reduces the volume (or

bass ) by step of 2 dB (with a programmable wait-

ing time), until no more clipping is detected.

Then the controller waits for a programmable time

before increasing the volume again by step of 2

dB until clipping is again detected or the panel se-

lected volume is reached.

Practical advantages of this application is a better

sound quality deriving from operation under no

clipping conditions, which also means the avail-

ability of higher undistorted power.

WHAT IS NEEDED FOR A DEMONSTRATION

- a XT or AT IBM compatible PC, supplied with

EGA card

- a SGS-THOMSON audioprocessor application disk

- a TDA 7302 + TDA7374B board

- a connector from audioprocessor board to PC

parallel port

GENERAL INFORMATION

In the application shown in fig 18 the TDA7302

audioprocessor works on PC XT or AT IBM com-

patible.

Control is accomplished by serial bus ( S-bus or

2C-bus or SPI bus) sent to the test board through

the PC parallel port.

The PC simulates the behaviour of the microproc-

essor in a real application (for example in a car

radio) and the buffer is necessary only in this ap-

plication for protecting the PC.

Figure: 18: Clipping Detector Control Routine

TDA7374B

10/13

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