Sony HT-ST9 User Manual page 23

[Screen Settings]
 [TV Type]
[16:9]: Select this when connecting to a wide-screen TV or a TV with
a wide-mode function.
[4:3]: Select this when connecting to a 4:3 screen TV without a wide-
mode function.
 [Output Video Resolution]
[Auto]: Outputs video signal according to the resolution of the TV or
connected device.
[480i/576i]*, [480p/576p]*, [720p], [1080i], [1080p]: Outputs video
signal according to the selected resolution setting.
* If the color system of the playback content is NTSC, the video signals
resolution can be converted to [480i] and [480p] only.
 [24p Output]
[Network content 24p Output]
This function sets the signals output from the HDMI OUT (ARC) jack
on the system when using the Screen mirroring function.
[Auto]: Outputs 24p video signals only when you connect a 1080/
24p-compatible TV via an HDMI connection and the [Output Video
Resolution] is set to [Auto] or [1080p].
[Off]: Select this when your TV is not compatible with 1080/24p
video signals.
 [4K Output]
[Auto1]: Outputs 2K (1920 × 1080) video signals during video
playback and 4K video signals during photo playback when
connected to a 4K-compatible device manufactured by Sony.
Outputs 4K video signals during playback of 24p video content or
playback of photos when connected to a device other than 4K-
compatible device manufactured by Sony.
This setting does not work for 3D video image playback.
[Auto2]: Automatically outputs 4K/24p video signals when you
connect a 4K/24p-compatible device and make the appropriate
settings for [Network content 24p Output] in [24p Output], and also
outputs 4K/24p photo images when you play 2D photo files.
[Off]: Turns off the function.
Note
If your device manufactured by Sony is not detected when [Auto1] is
selected, the setting will have the same effect as [Auto2] setting.
 [YCbCr/RGB (HDMI)]
[Auto]: Automatically detects the type of external device, and then
switches to the matching color setting.
[YCbCr (4:2:2)]: Outputs YCbCr 4:2:2 video signals.
[YCbCr (4:4:4)]: Outputs YCbCr 4:4:4 video signals.
[RGB]: Select this when connecting to a device with an HDCP
compliant DVI jack.
 [HDMI Deep Colour Output]
[Auto]: Normally select this.
[12bit], [10bit]: Outputs 12bit/10bit video signals when the connected
TV is compatible with Deep Colour.
[Off]: Select this when the picture is unstable or colors appear
unnatural.
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