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STV82X6 数据表(PDF) 13 Page - STMicroelectronics |
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STV82X6 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 95 page  13/95 STV82x6 Demodulator Block The level of the demodulated sound may require adjusting in order to compensate for the difference in levels between the multiple source (NICAM, FM or AM) and standard source (FM deviation wide range from 15 to 500 kHz) signals. The correct range for all level variations (+24 to -6 dB) is selected in registers PRE_FM and PRE_NICAM. The internal sound level of the various sources (FM/AM, NICAM and SCART) is read in registers PEAK_DET_CTRL, PEAK_DET_STATL and PEAK_DET_STATR before audio processing and can be used to implement Automatic Pre-scaling via an external I²C interface. In Automatic mode, the STV82x6 selects and performs all appropriate de-emphasis, dematrixing, sound selection and mute functions according to the standard and transmission mode detected. Mono system: Mono audio signals received by an FM or AM carrier are demodulated. Left and right audio outputs are identical. Automatic mute is applied when the mono standard cannot be identified. A2 systems (or Zweiton): Transmission of mono, stereo or bilingual audio signals using 2 separate FM carriers + identification pilot. The pilot, transmitted by the second carrier, can be modulated by two different tones in order to define Stereo or Dual-Mono mode. If not modulated, only the mono signal is broadcast on the first carrier. Zweiton mode is read in register ZWT_STAT and described in Table 4. In the event of poor signal detection, the audio output is switched back to FM Mono mode (backup). In Dual Mono mode, the language (A on Channel 1, B on Channel 2) can be selected separately for each audio output channel (Loudspeaker, Headphone, SCART or I²S) in register CH_LANG. Note: A2 and A2* standards are German Zweiton, while A2+ is Korean Zweiton. NICAM systems: Transmission of mono, stereo, bilingual or trilingual audio signals using a modulated-QPSK carrier and an FM/AM sound carrier backup. The digital QPSK modulation broadcasts either channel stereo, dual mono, mono + data or data only. The selected NICAM mode is read in register NICAM_STAT and described in Table 5. In the event of high bit-error rates, the audio output is automatically switched back to the reserve sound transmission (FM/AM Mono) or muted if there is no backup. In Dual Mono or Stereo mode with no backup, the language can be selected separately for each audio output channel (Loudspeaker, Headphone, SCART or I²S) in register CH_LANG. Table 4: A2 System Transmission Modes System Mode ZWT-STAT [2:0] FM Dematrix FM De-emphasis CH_LANG [1:0] Sound Selection Sound Backup German Zweiton Mono 100 L,R 50 µs XX FM Mono X German Zweiton Stereo 110 (L+R)/2,R 50 µs XX FM Stereo FM Mono German Zweiton Dual Mono (CH1=A, CH2=B) 101 L,R 50 µs 01 FM Mono A X 10 FM Mono B Mute Korean Zweiton Mono 100 L,R 75 µs XX FM Mono X Korean Zweiton Stereo 110 (L+R)/2,(L-R)/2 75 µs XX FM Stereo FM Mono Korean Zweiton Dual Mono (CH1 = A, CH2 = B) 101 L,R 75 µs 01 FM Mono A X 10 FM Mono B Mute Zweiton undefined 0XX or 111 L,R 50 µs XX FM Mono X |
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