Panasonic GX740Z Ehelp page 103

HE-AAC is a perceptual coding method used to compress digital audio for
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efficient storage and transmission. (New Zealand only)
Not valid in Analogue TV
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SPDIF Selection
(Auto / PCM / Dolby
Selects the initial setting for digital audio output signal from DIGITAL AUDIO
OUT and HDMI2 (ARC function) terminals.
SPDIF is a standard audio transfer file format.
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Auto:
Dolby Audio (Dolby Digital, Dolby Digital Plus, Dolby AC-4), Dolby
Atmos and HE-AAC multi-channel are output as Dolby Digital
Bitstream. MPEG is output as PCM.
– Dolby Atmos may be output as Dolby Atmos Bitstream, Dolby Digital
Plus and Dolby AC-4 may be output as Dolby Digital Plus Bitstream
from HDMI2 (ARC function) terminal depending on the connected
equipment.
PCM:
Digital output signal is fixed to PCM.
Dolby Audio:
Dolby Audio (Dolby Digital, Dolby Digital Plus, Dolby AC-4), Dolby
Atmos, HE-AAC and AAC are output as Dolby Digital Bitstream or
Dolby Digital Plus Bitstream.
– Dolby Atmos may be output as Dolby Atmos Bitstream from HDMI2
(ARC function) terminal depending on the connected equipment.
ARC (Audio Return Channel) is a function of digital audio output using
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HDMI cable.
For Digital TV, video content
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Media Player > Playback > Audio output settings
Network > Videos > Audio output settings
HDMI Audio Format
(Auto / Bitstream / PCM)
Selects the audio format for the HDMI input signal.
Auto:
Dolby Audio is output as Dolby Audio Bitstream. Other digital audio
output signals are output as PCM. When the sound is delivered from
theatre speakers, Dolby Audio is output with pass-through method.
Audio)
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