 |
АвтоАвтоматизацияАрхитектураАстрономияАудитБиологияБухгалтерияВоенное делоГенетикаГеографияГеологияГосударствоДомДругоеЖурналистика и СМИИзобретательствоИностранные языкиИнформатикаИскусствоИсторияКомпьютерыКулинарияКультураЛексикологияЛитератураЛогикаМаркетингМатематикаМашиностроениеМедицинаМенеджментМеталлы и СваркаМеханикаМузыкаНаселениеОбразованиеОхрана безопасности жизниОхрана ТрудаПедагогикаПолитикаПравоПриборостроениеПрограммированиеПроизводствоПромышленностьПсихологияРадиоРегилияСвязьСоциологияСпортСтандартизацияСтроительствоТехнологииТорговляТуризмФизикаФизиологияФилософияФинансыХимияХозяйствоЦеннообразованиеЧерчениеЭкологияЭконометрикаЭкономикаЭлектроникаЮриспунденкция
Gain Control
|
Читайте также: |
The PA amplifier receives gain signals from the REU. The REU receives inputs from the engine running relays. When engine number 1 or 2 operates, the PA amplifier gain increases by 6 db to compensate for the increase in the ambient noise level.
The oxygen indicator relay sends a signal to the PA amplifier when the cabin loses cabin pressure. This increases the amplifier gain by 3 db to adjust for the increase in cabin noise level.
Chimes
The PA amplifier supplies chimes for these conditions:
· NO SMOKING/FASTEN SEAT BELTS switches - low chime
Attendant call switch from lavatories or passenger service units - high chime
· Attendant call switch from attendant panels or flight compartment - high/low chime.
Audio
The PA amplifier prioritizes and amplifies the audio. The PA amplifier sends the audio to these systems and LRUs:
· Audio entertainment
· REU muting relays and to attendant speakers
· PSU speakers
· Lavatory speakers.
When the flight or cabin crew makes an announcement, or the tape reproducer operates, a PTT goes to the entertainment system. This stops the entertainment system operation, and lets the passengers hear the announcement.
Power
The tape reproducer receives 115v ac from XFER BUS 2 for power.
Audio
The tape reproducer sends music and announcement audio to the PA amplifier.
The PA amplifier receives the audio inputs from the tape reproducer and sets the priority. The PA amplifier will process the audio from the tape reproducer when there are no crew announcements.
Поиск по сайту: