comparison Syncopation models/synpy/TOB.py @ 45:6e9154fc58df

moving the code files to the synpy package directory

+'''
+Author: Chunyang Song
+Institution: Centre for Digital Music, Queen Mary University of London
+
+'''
+
+from basic_functions import ceiling, find_divisor, is_prime, velocity_sequence_to_min_timespan
+
+def get_syncopation(bar, parameters = None):
+	binarySequence = velocity_sequence_to_min_timespan(bar.get_binary_sequence())
+	sequenceLength = len(binarySequence)
+
+	syncopation = 0
+
+	# if the length of b_sequence is 1 or a prime number, syncopation is 0;
+	# otherwise the syncopation is calculated by adding up the number of off-beat notes
+	if not ( (sequenceLength == 1) or (is_prime(sequenceLength)) ):
+		# find all the divisors other than 1 and the length of this sequence
+		divisors = find_divisor(sequenceLength)		
+		del divisors[0]
+		del divisors[-1]
+
+		# the on-beat/off-beat positions are the ones that can/cannot be subdivided by the sequenceLength;
+		# the on-beat positions are set to be 0, off-beat positions are set to be 1
+		offbeatness = [1]*sequenceLength			
+		for index in range(sequenceLength):
+			for d in divisors:
+				if index % d == 0:
+					offbeatness[index] = 0
+					break
+			#print 'offbeatness', offbeatness
+			# syncopation is the sum of the hadamard-product of the rhythm binary-sequence and the off-beatness 
+			syncopation += binarySequence[index]*offbeatness[index]
+	
+	return syncopation