Cisco Headend Digital Broadband Delivery System Betriebsanweisung
4002178 Rev C
Audio Options
2-11
Adjust the Volume from Either the Set-Top or the TV
Introduction
The Audio Volume Control option allows subscribers to adjust the volume from
either the set-top or the TV. If you do not enable this option, then you must select
where the volume is controlled for all of your subscribers.
Recommended Setting
We recommend that you always make Audio: Volume Control available to
subscribers on the General Settings menu and that you select Fixed as the default.
Fixed versus Variable Method
Subscriber can use two methods for controlling volume within their home. The two
methods are:
•
Fixed. The subscriber controls the volume using the TV. The remote must be
programmed to support audio control on the TV and all other functions on the set-
top.
The fixed method is the
recommended way to configure the set-top to
operate. This configuration provides for the best stereo signal for customers using
the audio left/right pair or the RF output on set-tops that provide BTSC stereo
encoding capability. There are, however, two areas where issues may be
encountered:
−
If a subscriber’s universal remote does not work with his or her TV, then the
subscriber cannot control the volume level with that remote. The subscriber
must use one remote to change channels and a second remote to control the
volume.
−
If the TV does not work with any remote control (very old TVs), the subscriber
cannot control the volume with a remote control.
If either of these issues are encountered, the subscriber may find it more appealing
to simply control the volume level and mute functions with the set-top instead of
the TV.
•
Variable. The subscriber can control all audio functions using the set-top. The TV
should be set to a comfortable listening level with the set-top set to a level of 25 or
higher (this avoids audio degradation issues). This configuration is not
recommended because the analog audio output can be degraded if the set-top
output level is set to less than 10. There is an advantage that a single remote can
be used that works around the issues described for the Fixed method.
Note: If you are using the HDMI output on the set-top and the volume control on
the set-top is set to Variable, the set-top will behave as if it is changing the volume
when you press Volume + or Volume -, but the volume is not changing. The audio
level for HDMI is always Fixed. If you use the HDMI output, set the volume control
to Fixed to avoid confusion.