STV8206 STMicroelectronics, STV8206 Datasheet - Page 15

• Manufacturer Part Number: STV8206
• Description: IC TV AUDIO PROC/DEMOD 80-TQFP
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of STV8206

• Applications: Radio
• Mounting Type: Surface Mount
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

STV82x6
Note:
Korean Zweiton Dual Mono
German Zweiton Stereo
Mono (CH1=A, CH2=B)
German Zweiton Mono
Korean Zweiton Stereo
German Zweiton Dual
Korean Zweiton Mono
(CH1 = A, CH2 = B)
Zweiton undefined
System Mode
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.
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
(FM/AM, NICAM and SCART) is read in registers PEAK_DET_CTRL,
PEAK_DET_STATR
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.
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
Table
(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.
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
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.
4. In the event of poor signal detection, the audio output is switched back to FM Mono mode
ZWT-STAT
0XX or 111
NICAM_STAT
[2:0]
100
110
101
100
110
101
before audio processing and can be used to implement Automatic Pre-scaling
PRE_FM
Table 4: A2 System Transmission Modes
(L+R)/2,(L-R)/2
FM Dematrix
and PRE_NICAM. The internal sound level of the various sources
(L+R)/2,R
and described in
L,R
L,R
L,R
L,R
L,R
De-emphasis
50 µs
50 µs
50 µs
75 µs
75 µs
75 µs
50 µs
FM
Table
5. In the event of high bit-error rates, the
CH_LANG
[1:0]
XX
XX
XX
XX
XX
01
10
01
10
ZWT_STAT
PEAK_DET_STATL
FM Mono A
FM Mono B
FM Mono A
FM Mono B
Selection
FM Stereo
FM Stereo
FM Mono
FM Mono
FM Mono
Sound
Demodulator Block
and described in
FM Mono
FM Mono
Backup
Sound
Mute
Mute
and
X
X
X
X
X
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