Comb filter with feedforward and feedback delay control The teeth~ object implements a comb filter, in which a slightly delayed version of a signal is added to itself, causing phase cancellations and a spectrum that looks like a comb. Cycling '74 MSP MSP Filters (signal) Input TEXT_HERE (signal/float) Feedforward Delay in ms TEXT_HERE (signal/float) Feedback Delay in ms TEXT_HERE (signal/float) Gain Coefficient TEXT_HERE (signal/float) Feedforward Coefficient TEXT_HERE (signal/float) Feedback Coefficient TEXT_HERE (signal) Filter Output TEXT_HERE Set the feedforward delay amount Sets the initial value for the feedforward delay, in milliseconds. If a signal is connected to this inlet, the coefficient supplied as an argument for that inlet is ignored. If no argument is present, the delay time defaults to 10 milliseconds. Set the feedback delay amount Sets the initial value for the feedback delay, in milliseconds. If a signal is connected to this inlet, the coefficient supplied as an argument for that inlet is ignored. If no argument is present, the delay time defaults to 10 milliseconds. Set the gain Sets the initial value for the gain. If a signal is connected to this inlet, the coefficient supplied as an argument for that inlet is ignored. If no argument is present, the value defaults to 0. Set the feedforward gain Sets the initial value for the feedforward gain. If a signal is connected to this inlet, the coefficient supplied as an argument for that inlet is ignored. If no argument is present, the value defaults to 0. Set the feedback gain Sets the initial value for the feedback gain. If a signal is connected to this inlet, the coefficient supplied as an argument for that inlet is ignored. If no argument is present, the value defaults to 0. Function depends on inlet The filter parameters in inlets 2 to 6 may be specified by a float instead of a signal. If a signal is also connected to the inlet, the float is ignored. Function depends on inlet The filter parameters in inlets 2 to 6 may be specified by a float instead of a signal. If a signal is also connected to the inlet, the float is ignored. Clear the teeth~ object's memory Clears the teeth~ object's memory of previous outputs, resetting them to 0. Function depends on inlet In left inlet: Signal to be filtered. The teeth~ object is a variant of comb~-- a comb filter that mixes the current input sample with earlier input and/or output samples to accentuate and attenuate the input signal at regularly spaced frequency intervals. Unlike the comb~ object, teeth~ adds feedforward and feedback, which adds to the extremity of the effect.

In 2nd inlet: Feedforward - the delay, in milliseconds, before past samples of the input are added to the current input.

In 3rd inlet: Feedback - the delay, in milliseconds, before past samples of the output are added to the current input.

In 4th inlet: Gain coefficient - for scaling the amount of the input sample to be sent to the output.

In 5th inlet: Gain coefficient - for scaling the amount of feedforward to be sent to the output.

In right inlet: Gain coefficient - for scaling the amount of feedback to be sent to the output. Set parameters as a list to the left inlet The five parameters can be provided as a list in the left inlet. The first number in the list is the feedforward delay, the next number is the feedback delay, the third number is the Gain coefficient for the input sample, the fourth number is the feedforward gain coefficient, and the fifth number is the feedback gain coefficient. If a signal is connected to a given inlet, the coefficient supplied in the list for that inlet is ignored. The teeth~ object is a variation of the comb~ object and implements a similar filter formula:

y[n] = a * x[n] + b * x[n - FFdelay] + c * y[n - FBdelay] The filtered signal.