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FlipTop Computer Center Crestron QM-FTCC
Auto Compensation with a Self-Peaking Receiver
Crestron's innovative self-peaking audio circuit eliminates the need to peak the
audio signal.
Without self-peaking the same peak and boost values are applied equally to the
video and audio signals. When these signals travel the same path, this
arrangement is satisfactory. However, when video and audio travel to a receiver
from different paths, unequal cable lengths are created. The self-peaking feature
eliminates the need to hunt for peak and boost values by allowing the receiver to
read the ID, input compensation and microphone EQ from the audio channel
regardless of the peaking and boost values applied. Then using the transmitter
ID, the receiver recalls the preset containing the proper peak and boost settings
for the video, and implements the correct input compensation and microphone
EQ settings.
NOTE: QM devices that do not have self-peaking include:
● QM-RMCRX
● QM-MD7x2
● QM-MD5x1
● TPMC-15-QM
● TPMC-17-QM
Switchers
The QM-MD7x2 and the QM-MD5x1 terminate and re-initialize the audio path
within the unit, however, they pass on the video untouched. This creates
different path lengths for the video and audio. This difference in path length
creates different peak and boost levels for audio and video. In the initial QM
receivers the video and audio circuits, peak/boost have the same settings for the
audio and video. The initial QM receivers cannot accommodate different
settings, and may experience difficulties resolving the signals.
The QM-MD8x8 and QM-MD4x2 are simply analog switches. When audio-
breakaway is implemented, the audio and video paths are likely to be different.
For receivers without self-peaking audio, a probable conflict exists. For
receivers with self-peaking, auto compensation is still problematic when audio-
breakaway is done since the transmitter ID is that of the audio source and the
video source is from a different device with a different transmitter ID.
The self-peaking audio circuit resolves the problem of unequal cable lengths.
Because no audio setting is required, the video can have an independent
peak/boost as set by the program.
QM-AE Audio Extractor
The QM-AE is an audio-only device. The QM cable loops through the QM-AE
from the input connector to the output connector. The QM-AE taps only the
audio signals of the QM cable. The QM-AE is a self-peaking receiver, so
peaking is not required.
56 • FlipTop Computer Center: QM-FTCC Operations & Installation Guide - DOC. 6313A