L-ACOUSTICS LA8 Руководство по эксплуатации онлайн [41/56] 776313
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L-ACOUSTICS LA8 Руководство по эксплуатации онлайн [41/56] 776313

L-ACOUSTICS LA8 Руководство по эксплуатации онлайн [41/56] 776313
LA8_UM_EN_4-0
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7.9.3 FALLBACK MODE control
This control page is for enabling or disabling the automatic fallback option. When enabled, and when the AES/EBU
INPUT MODE is selected, this option prevents sound cut in case of digital signal failure (no clock, loss of lock, invalid
audio [validity bit], CRC error, bipolar encoding error, data slip), by allowing the controller to automatically switch from
AES/EBU to ANALOG inputs.
After the digital signal has returned to normal state, reverting to the AES/EBU input mode is not automatic and must be
done manually by the user (by using LA NETWORK MANAGER software, one click is sufficient for all concerned
amplified controllers).
Before enabling the automatic fallback option, some precautions have to be taken in order to avoid sound
cut or level differences in case of switch from AES/EBU to ANALOG inputs:
•
(Compulsory) The analog input(s) of the amplified controller [6.4.2] must be connected to an
analog audio source playing the same program as the digital audio source (generally using the
analog outputs of the same mixing desk).
•
(Compulsory) The levels between the digital and analog sources must be aligned using the
AES/EBU IN GAIN control [7.9.4].
•
(Recommended)
The EVEN DELAY setting (see Table 6) should be selected when enabling the
fallback option so as to ensure seamless switchover
.
Three FALLBACK MODE settings are available, as described in Table 6:
Table 6: FALLBACK MODE settings description
OFF
Automatic fallback option disabled.
The sound will be cut off in case of digital signal failure but will automatically be recovered
when the signal has returned to normal state.
The propagation delay will be 3.4 ms. This value is optimal.
ON w. BEST DELAY
Automatic fallback option enabled with best delay.
The ANALOG inputs will automatically be selected in case of digital signal failure. Revert to
AES/EBU input is not automatic and must be done manually by the user.
The propagation delay will be 3.4 ms. This value is optimal.
ON w. EVEN DELAY
Automatic fallback option enabled with even delay.
The ANALOG inputs will automatically be selected in case of digital signal failure. Revert to
AES/EBU input is not automatic and must be done manually by the user.
The propagation delay will be 3.9 ms. This value is equal to the analog delay value so as to
ensure seamless fallback switch from AES/EBU to ANALOG inputs.
The FALLBACK MODE setting procedure is the following:
1. Select the FALLBACK MODE control page by rotating the encoder wheel and press the OK key or the encoder
wheel (or press the ESC key to cancel and return to the last menu).
2. Select the chosen setting by turning the encoder wheel. Press the OK key or the encoder wheel to validate (or
press the ESC key to cancel and return to the last menu).
Figure 35: FALLBACK MODE setting
FA
LLBACK MODE
OFF
FALLBACK MODE
> ON w. EVEN DELAY <
FALLBACK
MODE
ON w. EVEN DELAY
OK
ESC
OK
ESC
IMPORTANT

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