quickthresh

Fast chord detection

Description

quickthresh is a faster, low-latency, thresh-like object - optimized for chord detection.

Arguments

Name Type Opt Description
base-thresh 'fudge' and thresh-extension times (milliseconds) int or float opt Three numerical arguments can be given to "fine tune" the timing thresholds to suit your musical needs. The first argument is the base thresh time in milliseconds; all notes received within this time period are collected into a list. The second argument is the "fudge" time in milliseconds - if any notes are played within this amount of time at the end of the base thresh time, the threshold is extended. The third argument is the thresh extension time in milliseconds. This is an additional time frame added to the first argument, if necessary, in order to capture additional notes (due to sloppy playing) into the list. By default the three arguments are set to 40, 10 and 20, respectively.

Messages

bang A bang will reset quickthresh and output the notes in its buffer.
int input [int]
In left inlet: The incoming values which appear within a certain time threshold are stored and output as a list. See the arguments' descriptions to learn how the time thresholding works.
  (inlet1) base-thresh-time (milliseconds) [int]
In second inlet: Sets the millisecond value for the base thresh time. All values received in the left inlet within this time period are collected into a list.
  (inlet2) 'fudge'-time (milliseconds) [int]
In third inlet: Sets the "fudge" time in milliseconds. If there are any incoming values within this amount of time at the end of the base thresh time, the threshold is extended to allow more values to be added to the list.
  (inlet3) threshold-extension-time (milliseconds) [int]
In fourth inlet: Sets the threshold extension in milliseconds. This is an extension of the base thresh time, which is used if values arrive in the object's inlet in the "fudge" time zone.
float input [float]
In left inlet: The incoming values which appear within a certain time threshold are stored and output as a list. See the arguments' descriptions to learn how the time thresholding works.
  (inlet1) base-thresh-time (milliseconds) [float]
In second inlet: Sets the millisecond value for the base thresh time. All values received in the left inlet within this time period are collected into a list.
  (inlet2) 'fudge'-time (milliseconds) [float]
In third inlet: Sets the "fudge" time in milliseconds. If there are any incoming values within this amount of time at the end of the base thresh time, the threshold is extended to allow more values to be added to the list.
  (inlet3) threshold-extension-time (milliseconds) [float]
In fourth inlet: Sets the threshold extension in milliseconds. This is an extension of the base thresh time, which is used if values arrive in the object's inlet in the "fudge" time zone.
set base-thresh 'fudge' and thresh-extension times (milliseconds) [list]
The word set, followed by three millisecond values, can be used to set the three threshold parameter values (base thresh time, "fudge" time and thresh extension).

Information for box attributes common to all objects

Output

float: When quickthresh has used up its threshold time, any incoming values that were played within the time threshold are output as a list.

Examples

A comparison of quickthresh and thresh shows that quickthresh detects chords with lower more constant latency

See Also

Name Description
bondo Synchronize a group of messages
buddy Synchronize arriving data, output them together
iter Break a list up into a series of numbers
pack Combine numbers and symbols into a list
thresh Combine numbers into a list when received close together