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STV8216 数据表(PDF) 14 Page - STMicroelectronics |
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STV8216 数据表(HTML) 14 Page - STMicroelectronics |
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14 / 97 page  Demodulator Block STV82x6 14/97 Sound Carrier Frequency Offset Recovery: Both Mono and Stereo IF Carrier frequencies can be adjusted independently (registers CAROFFSET1 and CAROFFSET2) within a large range (up to 120 kHz for standard mono FM deviations) while the AUTOSTD system remains active. The frequency offset estimation is written in registers FM_DCL and FM_DCR (Mono Left / Channel 1 And Mono Right / Channel 2, respectively) and can be used to implement the Automatic Frequency Control (AFC) via an external I²C control. If required, the AUTOSTD system can be disabled (Manual mode) and the user can control all registers including those only controlled by the AUTOSTD function when active. Manual mode is selected in registers RESET or AUTO_SCKM. 2.1.3 Sound Preprocessing and Selection The demodulated sound signal can be redirected to 4 different output audio channels: 1. Loudspeaker & Subwoofer, 2. Headphone, 3. SCART, 4. I²S Interface. Each output channel can independently select the demodulator source, analog SCART or I²S inputs using register CH_SEL. Figure 8: Sound Preprocessing and Selection Block Diagram DC Prescaler Dematrix FM FM NICAM I²S OUT Peak Detector FM/AM AUDIO IN (From Input Analog Audio Matrix) (From Demodulator) LS IN (To Loudspeaker Processing) HP IN (To Headphone Processing) AUDIO OUT (To Output Analog Audio Matrix) (To I²S Interface) (From Demodulator) PRE_FM(44h) PRE_NICAM(45h) PRE_AUX(46h) PEAK_DET_CTRL(4Bh) PEAK_DET_STATL(4Ch) CH_MX(48h) CH_SEL(49h) CH_LANG(4Ah) FM_DCL(42h) FM_DCR(43h) Removal Prescaler Dematrix NICAM NICAM Prescaler SCART De-emphasis NICAM De-emphasis FM I²S IN PRE_AUX(46h) CH_MX(48h) Prescaler I²S PEAK_DET_STATR(4Dh) |
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