Polycom SoundStructure C16 Design Manual page 404

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
A - 62
hpf_en Enable High-Pass Filter
Argument Argument value
Channel Type Virtual Channel
Value Type Boolean
Read/Write Mode Read/Write
Phys Chans Conferencing Mic/Line Input, Conferencing Line Output,
Sound Reinforcement Mic/Line Input, Sound Reinforcement
Line Output, Analog Telephony Input, Analog Telephony
Output, Submix, ConferenceLink Aux Input, ConferenceLink
Aux Output
Virt Chans Mono, Stereo
Default 0
Description
This parameter enables (1) or disables (0) the high-pass filter for the specified
virtual channel.
hpf_frequency Frequency Of High-Pass Filter
Argument Argument value
Channel Type Virtual Channel
Value Type Floating-Point
Read/Write Mode Read/Write
Phys Chans Conferencing Mic/Line Input, Conferencing Line Output,
Sound Reinforcement Mic/Line Input, Sound Reinforcement
Line Output, Analog Telephony Input, Analog Telephony
Output, Submix, ConferenceLink Aux Input, ConferenceLink
Aux Output
Virt Chans Mono, Stereo
System Limits Minimum: 20.0, Maximum: 20000.0, Resolution: 0.1
Default 160.0
User Limits No
Supported
Description
This parameter sets the frequency (in Hz) of the high-pass filter. For
Butterworth filters this is the 3 dB frequency, but for Linkwitz-Riley filters, this
is the 6 dB frequency.