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. Resonance for filter Sets the initial resonance 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 resonance 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 resonance 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 for svf~ are typically between 0.01 and 1. The filtered input signal.