annotate Syncopation models/TOB.py @ 14:6b6f8e3d7262

updating lhl and prs

'''
Author: Chunyang Song
Institution: Centre for Digital Music, Queen Mary University of London

'''

from BasicFuncs import ceiling, find_divisor, get_min_timeSpan

# This function calculates the syncopation value for TOB model.
def get_syncopation(seq):
	syncopation = 0
	bseq_ts = get_min_timeSpan(ceiling(seq))	# converting to binary and mininum time-span sequence
	divisors = find_divisor(len(bseq_ts))		# find all the divisors other than 1 and the length of this sequence
	del divisors[0]
	del divisors[-1]

	offbeatness = [1]*len(bseq_ts)			
	for index in range(len(bseq_ts)):
		for d in divisors:
			if index % d == 0:
				offbeatness[index] = 0
				break
		syncopation += bseq_ts[index]*offbeatness[index]
	return syncopation