Cisco Cisco D9887B HDTV Modular Receiver Installation Guide
Appendix E
D9887B Receiver Audio Explanation
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General Audio Setup for Measurements
The D9887B receiver has three primary operation modes that affect the quantity of
compression with decoded Dolby Digital signals. All tests are made with the "user"
mode of operation. This eliminates any signal compression on Dolby Digital signals
downmixed in the D9887B receiver. This mode has no effect on PCM encoded audio
(AES). The analog output gain is set to "7" for all tests. This results in a level of
approximately -0.7 dBu for a digital input level of -20 dBFS. This would be the
operating level of the D9887B receiver's analog outputs for a standard digital signal.
compression with decoded Dolby Digital signals. All tests are made with the "user"
mode of operation. This eliminates any signal compression on Dolby Digital signals
downmixed in the D9887B receiver. This mode has no effect on PCM encoded audio
(AES). The analog output gain is set to "7" for all tests. This results in a level of
approximately -0.7 dBu for a digital input level of -20 dBFS. This would be the
operating level of the D9887B receiver's analog outputs for a standard digital signal.