TDA7370 datasheet(13/17 Pages) STMICROELECTRONICS

13 / 17 page

CLIPPING DETECTOR

Figures 25 and 26 show an application using the

TDA7370 in combination with the SGS-THOM-

SON audioprocessor TDA7302.

The output clipping is recognized by the micro-

processor (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.24

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 steps of 2 dB (with a programmable

waiting 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 + TDA7370 board

- a connector from audioprocessor board to PC

parallel port

GENERAL INFORMATION

In the application shown in figures 25 and 26 the

TDA7302 audioprocessor works on PC XT or AT

IBM compatible.

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 24: Clipping Detector Control Routine

TDA7370

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