The TDA9874A is a single-chip Digital TV SoundDemodulator/Decoder (DTVSD) for analog and digitalmulti-channel sound systems in TV/VCR sets and satellitereceivers.The multi-standard/multi-stereo capability of theTDA9874A is of interest in Europe, Hong Kong/PR Chinaand South East Asia. This includes B/G, D/K, I, M andL standard. In other application areas subsets of thestandard combinations are available or, only singlestandards are transmitted.All A2 (analog 2-carrier) and NICAM systems aresupported. M standard (with mono or BTSC stereo sound)can be received and processed in mono sound mode.The AM sound of L/L’ standard is normally demodulated inthe 1st sound IF. The resulting AF signal has to be enteredinto the mono audio input of the TDA9874A. A secondpossibility is to use the internal AM demodulator stage(with 6.5 MHz intercarrier), which gives limitedperformance.Korea has a stereo sound system similar to Europe and issupported by the TDA9874A. The differences includedeviation, modulation contents and identification. It isbased on M standard.For all FM standards a high deviation mode for a singlecarrier monaural sound demodulation is selectable.An overview of the supported standards and soundsystems and their key parameters is given inTables 1 to 3.The analog multi-channel systems are sometimes alsocalled 2CS (2-carrier systems).