Sony IPELA PCS-HG90 Operating Instructions Manual page 75

hand, reduction of high frequency components may degrade the resolution and
picture details may blur. These effects depend on picture details.
Use the 2D smoothing filter when the input video signal is noisy or a
videoconference is to be conducted with a lower bit rate.
Frame Rate Control
The encoder of the Communication Terminal automatically and finely adjusts
parameters to control the bit rate. This control normally sets the actual
transmission bit rate to the selected communication bit rate. However, the
transmission bit rate may exceed the selected bit rate when the communication
bit rate is low or with some types of picture details.
If "Frame Rate Control" is set to "Bandwidth Limiting Priority", the
Communication Terminal stops the encoder to maintain a transmission bit rate
lower than the selected communication bit rate. The encoder restores encoding
after a certain period of time has elapsed and data transmission becomes
possible, but the bit rate on the receiver side is apparently reduced due to the
period without video data transmission.
When "Frame Rate Control" is set to "Frame Rate Priority", priority is given
to video transmission at the selected frame rate, allowing the encoder to exceed
the selected communication bit rate. The degree of excess allowance depends
on the communication bit rate setting or the picture details. Note that a frequent
packet loss may occur with the "Frame Rate Priority" setting, especially when
you are using a network with a lower bandwidth, as the Communication
Terminal tries to transmit data at a bit rate much greater than the selected
communication bit rate.
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Setting the Transmitting Image Quality