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STV82X7 데이터시트(PDF) 40 Page - STMicroelectronics

부품명 STV82X7
상세설명  Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
PDF  156 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STV82X7 데이터시트(HTML) 40 Page - STMicroelectronics

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Dedicated Digital Signal Processor (DSP)
STV82x7
40/156
The beeper tone level and frequency are programmed in register BEEPER_FREQ_VOL. The level
(or volume) ranges between 0 dB and -93 dB in steps of 3 dB and the tone frequency ranges
between 62.5 Hz and 8 kHz in steps of 1 octave.
A beep generator is shared only by the Loudspeakers or Headphone outputs. Therefore, in the
event of simultaneous beeps when in Pulse mode, only the first beep will define the effective
duration that will be the same for both outputs.
4.16
Internal Audio/Video Delay (Lip Sync)
Since increasing processing on the video signal implies more delay compared to the audio signal,
there is a possibility inside the device of compensating by inserting a delay on the audio path in
order to resynchronize the two signals:
● 60ms with 48 KHz sampling frequency (SCART only input mode)
● 90ms with 32 KHz sampling frequency (demodulator input mode)
The same delay is available for the LS path and/or the HP path.
Figure 22: Pulse Mode
Figure 23: Continuous Mode
62.5 Hz < f < 8 kHz
BEEP_ON = 1
BEEP_ON = 0
T predefined
0.1, 0.25, 0.5 and 1.0 s
62.5 Hz < F < 8 kHz
BEEP_ON = 1
BEEP_ON = 0
T defined by I²C write



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