Testing the Tda7439 Remote Controlled Digital Audio Processor from SGS-Thomson

The TDA7439 allows the switching of 4 sources to one output,
Bass/Mid/Treb control, Input gain and volume control (among others). The functions of the chip are controlled via the i2c bus. It's commonly found in car audio applications but is perfectly suited to this use too.
These days most audio systems come with remote controllers. However, no such facility is provided for normal audio amplifiers. Such audio controllers are not available even in kit form. This article presents an infrared (IR) remote controlled digital audio processor. It is based on a microcontroller and can be used with any NEC-compatible full-function IR remote control.

This remote controlled digital audio processor has enhanced features and can be easily customized to meet individual requirements as it is programmable.
IC TDA7439 is a single chip I2C-bus compatible audio controller that is used to control all the functions of the audio amplifier. The output from any (up to four) stereo preamplifier is fed to the audio processor (TDA7439). The microcontroller can control volume, treble, bass, attenuation, gain and other functions of each channel separately. All these parameters are programmed by the microcontroller using SCL and SDA lines, which it shares with the memory IC and the audio processor.