Resonant bandpass filter Use the reson~ object when you need a resonant bandpass filter. Cycling '74 MSP MSP Filters (signal) Input to Filter TEXT_HERE (signal/float) Input Gain TEXT_HERE (signal/float) Center Frequency TEXT_HERE (signal/float) Q (Resonance) TEXT_HERE (signal) Filtered Output TEXT_HERE Initial gain for filter Sets the initial gain. The default value is 0. Center frequency for filter Sets the initial center frequency for the filter. The default value is 0. Q for filter Sets the initial Q value for the filter. The default value is 0.01. Set filter parameters An int can be sent in the three right inlets to change the filter-gain, center-frequency, and Q. If a signal is connected to one of the inlets, a number received in that inlet is ignored. An int or float can be sent in the three right inlets to change the filter-gain, center-frequency, and Q float can be sent in the three right inlets to change the filter-gain, center-frequency, and Q. If a signal is connected to one of the inlets, a number received in that inlet is ignored. Use a list to set filter parameters In left inlet: The first number sets the filter-gain. The second number sets the filter center-frequency. The third number sets the filter-Q. If any of the inlets corresponding to these parameters have signals connected, the corresponding value in the list is ignored. Clear filter memory Clears the filter's memory. Since reson~ is a recursive filter, this message may be necessary to recover from blowups. Function depends on inlet In left inlet: Any signal to be filtered.

In left-middle inlet: Sets the bandpass filter gain. This value should generally be less than 1.

In right-middle inlet: Sets the bandpass filter center frequency in hertz.

In right inlet: Sets the bandpass filter "Q"-roughly, the sharpness of the filter - where Q is defined by the center-frequency divided by the filter-bandwidth. Useful Q values are typically between 0.01 and 500. reson~ implements the following filter equation:

y[n] = a0 * (x[n] - r * x[n-2]) + b1 * y[n-1] + b2 * y[n-2]
where r, b1, and b2 are parameters calculated from the input center frequency fc and Q.

Q = fc/bandwidth.

Inputs can be floats or signals. The filtered input signal.