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STV82X6D Datasheet(PDF) 10 Page - STMicroelectronics |
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STV82X6D Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 95 page  Demodulator Block STV82x6 10/95 2 Demodulator Block Note: Zweiton is the Dual (Two Tone) FM stereo or A2 system. 2.1 Digital Demodulator 2.1.1 Sound IF Signal The Analog Sound Carrier IF is connected to STV82x6 via the SIF pin. Before Analog-to-Digital Conversion (ADC), an Automatic Gain Control (AGC) is performed to adjust the incoming IF signal to the full scale of the ADC. A preliminary video rejection is recommended to optimize conversion and demodulation performances. The AGC system provides a wide range of SIF input levels and is activated for all standards, except L/L’. In this particular case, the sound carrier is AM-modulated and an automatic level adjustment would only damage transmitted audio signal. A preset I²C parameter is required to define the gain of the AGC used in Manual mode (Registers AGCC and AGCS). 2.1.2 Demodulation The demodulation system operates by default in Automatic mode. In this mode, the STV82x6 is able to identify and demodulate any TV sound standard including NICAM and A2 systems (see Table 2) without any external control via the I²C interface. It consists of the two demodulation channels (Channel 1 = Mono Left and Channel 2 = Mono Right/Stereo) to simultaneously process two sound carriers in order to handle all transmission modes (stereo and up to three mono languages). The built-in Automatic Standard Recognition System (AUTOSTD) automatically programs the appropriate bits in the I²C registers which are forced to Read-only mode for users (see Section 9.1). The programming is optimized for each standard to be identified and demodulated. Figure 6: Demodulator Block Diagram Mixer Mixer DCO2 + Channel Filter FIR1 Channel Filter FIR2 AM Demodulator FM Demodulator FM Demodulator DQPSK Demodulator AUTOSTD AGC Control SIF NICAM Decoder DCO1+ Zweiton A/D NICAML NICAMR AM/FM Mono AM FML FM Stereo AUTO_CTRL(50h) AUTO_SCKM(51h) AUTO_SCKST(52h) AUTO_STAT(54h) DEMOD_STAT(0Dh) ZWT_STAT(41h) NICAM_STAT(3Fh) CAROFFSET1(22h) CAROFFSET2(3Ah) Channel 1 = Mono Left Channel 2 = Stereo/Mono Right AGCC(0Eh) AGCS(0Fh) (To Sound Preprocessing) (To Sound Preprocessing) (To Sound Preprocessing) Decoder AGC Amp |
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