State-variable filter with simultaneous outputs The svf~ object is an implementation of a state-variable filter algorithm described in Hal Chamberlin's book, "Musical Applications of Microprocessors." A unique feature of this filter object is that it produces lowpass, highpass, bandpass, and bandreject (notch) output simultaneously - all four are available as outlets. Cycling '74 MSP MSP Filters (signal) Input TEXT_HERE (signal/float) Cutoff Frequency (Hz) TEXT_HERE (signal/float) Resonance (0-1) TEXT_HERE (signal) Low-pass Output TEXT_HERE (signal) High-pass Output TEXT_HERE (signal) Band-pass Output TEXT_HERE (signal) Notch Output TEXT_HERE 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 Hz frequency input mode Sets the frequency input mode to Hz (the default mode - hence this is the same as providing no mode argument). Set linear frequency input mode Sets the frequency input mode to linear (0 -1). Set frequency input mode in radians Sets the frequency input mode to radians (0 -1). Function depends on inlet In middle and right inlets: Integer values are converted to floats and can be sent in the two right inlets to change the center frequency and Q of the filter. By default, the center frequency is expressed in Hz, where the allowable range is from 0 to one quarter of the current sampling rate. If a signal is connected to one of the inlets, a number received in that inlet is ignored. The values are sampled once every signal vector. Function depends on inlet In middle and right inlets: A float can be sent in the two right inlets to change the center frequency and Q of the filter. By default, the center frequency is expressed in Hz, where the allowable range is from 0 to one quarter of the current sampling rate. For convenience, svf~ has two additional input modes that use the more conventional input range, 0 - 1. (see the linear and radians messages). If a signal is connected to one of the inlets, a number received in that inlet is ignored. The values are sampled once every signal vector. Set the frequency input mode to Hz In either inlet: Sets the frequency input mode to Hz (the default). Clear the sample memory Clears the object's sample-memory in case of a blow-up. Set the frequency input mode to linear In any inlet: Sets the frequency input mode to linear (0 - 1). Linear mode is simply a scaled version of the standard Hz mode, except that values in the 0-1 range traverse the full frequency range. Set the frequency input mode to radians In any inlet: Sets the frequency input mode to radians (0 - 1). Radians mode lets you set the center frequency directly -- while the input has the same range (0-1), the output has a curved frequency response that is closer to the exponential pitch scale of the human ear. Function depends on inlet In left inlet: Signal to be filtered.

In middle inlet: Sets the filter center frequency in Hz.

In right inlet: Sets the bandpass filter "Q" - roughly, the sharpness of the filter - where Q is defined as the filter bandwidth divided by the center frequency. Useful Q values are typically between 0.01 and 500. The filtered input signal.