Beat channel node
Manually tap the beat of a piece of music, and automatically genera…
This realtime chop is used to manually tap the beat of a piece of music, and automatically generate a repeating ramp or pulse that continues to keep time with the music after the taps stop.
The chop computes the length of time (the period) of a beat. It can output five channels: a ramp from 0 to 1, a beat pulse, a beat count, and a constant channel containing the period.
The input must contain two channels, a Listen channel followed by a Tap channel. Often these channels are just two on/off keys on the computer keyboard (from the Keyboard chop), or two keys on a MIDI keyboard (from the Midi In chop). “On” must be greater than zero, and “off” must be zero or less.
When the “Listen” channel goes on, it means that you desire to change the tempo, and the CHOP is ready to record the user’s taps. After Listen goes on, the first tap on the Tap channel changes the output. A time slice or frame is output at the current frame, containing the beat information.
The next taps change the period of the beat, which is the length of the chop. The beat period is computed by taking the average time between taps. While the Listen channel is off, the output of the chop does not change.
If the Beat channel pulses are longer than one frame, only the time of the first sample matters.
To produce multiples of the tempo (double, half, quarter, etc), use the Tempo Scale menus to select a range of tempos. Tempos from 1/8th to 8x the tapped tempo can be produced.
Hit the Tap channel at any time to synch the ramp to start at the current frame.
Parameters
Beat
Lower/Upper Tempo Scale | Allows a range of beat channels from 1/8th of the input tempo to 8x the tempo. |
Output | Beat outputs either a time slice or one frame. |
Synch Beat | Resets the ramp on all taps, the first tap, or none. |
Grace Period | If a tap occurs close to a beat, do not reset the ramp if within the grace period. The units are based on ramp values; 0.1 means a grace period of ramp values above 0.9 and less than 0.1. |
Channel
Timer Ramp Name | This channel is a ramp from 0 to 1. The position within the beat cycle is represented as a value from 0 (start of beat) to 1 (end of beat). |
Timer Pulse Name | This channel outputs a 1-sample pulse at the start of the ramp cycle. |
Cycle Count Name | This channel counts the number of beats since the first tap. Re-synching the beat will reset this count to zero. |
Period Name | The name of the channel which contains the value of the period. Depending on the “Units” parameter in the Common page, it will be in Seconds, Frames or Samples. |
Period Start Name | The name of the channel which contains the start sample/frame/time of the current ramp. |
Sample Rate | The sample rate of the output channels. |