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TDA7374BV Fiches technique(PDF) 10 Page - STMicroelectronics |
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TDA7374BV Fiches technique(HTML) 10 Page - 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 I 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 |
Numéro de pièce similaire - TDA7374BV |
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Description similaire - TDA7374BV |
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