def test_codec_signal():
fs = 1000
peak = LowShelf(fs, 30, 1, 10,
count=2).get_transfer_function().get_magnitude()
avg = LowShelf(fs, 30, 1, 10).get_transfer_function().get_magnitude()
median = LowShelf(fs, 30, 1, 10).get_transfer_function().get_magnitude()
filt = CompleteFilter()
filt.save(HighShelf(fs, 60, 1, 5, count=2))
data = SingleChannelSignalData('test',
fs,
xy_data=[avg, peak, median],
filter=filt,
duration_seconds=123456,
start_seconds=123,
offset=4.2)
output = json.dumps(signaldata_to_json(data))
assert output is not None
decoded = signaldata_from_json(json.loads(output), None)
assert decoded is not None
assert isinstance(decoded, SingleChannelSignalData)
assert decoded.name == data.name
assert decoded.fs == data.fs
assert decoded.filter is not None
assert type(decoded.filter) is type(data.filter)
assert decoded.filter.id != -1
assert decoded.filter.description == data.filter.description
assert decoded.filter.filters == data.filter.filters
assert decoded.current_unfiltered is not None
assert len(decoded.current_unfiltered) == 3
assert decoded.current_unfiltered == data.current_unfiltered
assert decoded.duration_hhmmss == data.duration_hhmmss
assert decoded.start_hhmmss == data.start_hhmmss
assert decoded.end_hhmmss == data.end_hhmmss
assert decoded.offset == data.offset
def optimise_filters(filters, fs, to_save):
'''
Attempts to optimise the no of filters required.
:param filters: the filters to optimise.
:param fs: the sigma fs.
:param to_save: how many filters we want to save.
:return: the optimised filters.
'''
unstackable = sorted(
[f for f in filters if isinstance(f, Shelf) and f.count > 1],
key=lambda f: f.count,
reverse=True)
unstackable = sorted(unstackable,
key=lambda f: f.gain * f.count,
reverse=True)
weights = [abs(w.gain * w.count) for w in unstackable]
total_weight = sum(weights)
allocated = []
for idx, weight in enumerate(weights):
weight = float(weight)
p = weight / total_weight
max_amount = unstackable[idx].count - 1
distributed_amount = min(round(p * (to_save - sum(allocated))),
max_amount)
total_weight -= weight
allocated.append(distributed_amount)
new_filts = [f for f in filters if not isinstance(f, Shelf) or f.count < 2]
for idx, s in enumerate(unstackable):
reduce_by = allocated[idx]
if reduce_by > 0:
total_gain = s.gain * s.count
new_count = s.count - reduce_by
if new_count > 0:
new_gain = total_gain / new_count
tmp_shelf = LowShelf(fs,
s.freq,
s.q,
new_gain,
count=new_count)
average_s = (tmp_shelf.q_to_s() + s.q_to_s()) / 2
new_shelf = LowShelf(fs,
s.freq,
s_to_q(average_s, new_gain),
new_gain,
count=new_count)
logger.info(f"Replacing {s} with {new_shelf}")
new_filts.append(new_shelf)
else:
raise ValueError(
f"Attempted to reduce shelf count to 0 from {s.count}")
else:
new_filts.append(s)
return new_filts
def test_codec_StackedLowShelf():
filter = LowShelf(48000, 20, 1.5, 2.5, count=5)
output = json.dumps(filter.to_json())
assert output == '{"_type": "LowShelf", "fs": 48000, "fc": 20.0, "q": 1.5, "gain": 2.5, "count": 5}'
decoded = filter_from_json(json.loads(output))
assert decoded is not None
assert isinstance(decoded, LowShelf)
assert filter.fs == decoded.fs
assert filter.q == decoded.q
assert filter.gain == decoded.gain
assert filter.freq == decoded.freq
assert filter.count == decoded.count
assert decoded.get_transfer_function() is not None
def create_shaping_filter(self):
'''
Creates a filter of the specified type.
:return: the filter.
'''
filt = None
if self.filterType.currentText() == 'Low Shelf':
filt = LowShelf(self.__signal.fs, self.freq.value(),
self.filterQ.value(), self.filterGain.value(),
self.filterCount.value())
elif self.filterType.currentText() == 'High Shelf':
filt = HighShelf(self.__signal.fs, self.freq.value(),
self.filterQ.value(), self.filterGain.value(),
self.filterCount.value())
elif self.filterType.currentText() == 'PEQ':
filt = PeakingEQ(self.__signal.fs, self.freq.value(),
self.filterQ.value(), self.filterGain.value())
elif self.filterType.currentText() == 'Gain':
filt = Gain(self.__signal.fs, self.filterGain.value())
elif self.filterType.currentText() == 'Variable Q LPF':
filt = SecondOrder_LowPass(self.__signal.fs, self.freq.value(),
self.filterQ.value())
elif self.filterType.currentText() == 'Variable Q HPF':
filt = SecondOrder_HighPass(self.__signal.fs, self.freq.value(),
self.filterQ.value())
if filt is None:
raise ValueError(
f"Unknown filter type {self.filterType.currentText()}")
else:
filt.id = self.__selected_id
return filt
def xml_to_filt(file, fs=1000, unroll=False):
''' Extracts a set of filters from the provided minidsp file '''
from model.iir import PeakingEQ, LowShelf, HighShelf
filts = __extract_filters(file)
output = []
for filt_tup, count in filts.items():
filt_dict = dict(filt_tup)
if filt_dict['type'] == 'SL':
for i in range(0, count if unroll is True else 1):
filt = LowShelf(fs, float(filt_dict['freq']), float(filt_dict['q']), float(filt_dict['boost']),
count=1 if unroll is True else count)
output.append(filt)
elif filt_dict['type'] == 'SH':
for i in range(0, count if unroll is True else 1):
filt = HighShelf(fs, float(filt_dict['freq']), float(filt_dict['q']), float(filt_dict['boost']),
count=1 if unroll is True else count)
output.append(filt)
elif filt_dict['type'] == 'PK':
for i in range(0, count):
filt = PeakingEQ(fs, float(filt_dict['freq']), float(filt_dict['q']), float(filt_dict['boost']))
output.append(filt)
else:
logger.info(f"Ignoring unknown filter type {filt_dict}")
return output
def __make_default_filter(self):
''' Creates a new filter using the default preferences. '''
return LowShelf(self.__signal.fs,
self.__preferences.get(FILTERS_DEFAULT_FREQ),
self.__preferences.get(FILTERS_DEFAULT_Q),
0.0,
f_id=uuid4())
def test_codec_CompleteFilter():
filter = CompleteFilter(filters=[PeakingEQ(1000, 50, 3.2, -5),
LowShelf(1000, 25, 1, 3.2, count=3),
ComplexHighPass(FilterType.BUTTERWORTH, 6, 1000, 12)],
description='Hello from me')
output = json.dumps(filter.to_json())
expected = '{"_type": "CompleteFilter", "description": "Hello from me", "fs": 1000, "filters": [' \
'{"_type": "ComplexHighPass", "filter_type": "BW", "order": 6, "fs": 1000, "fc": 12.0}, ' \
'{"_type": "LowShelf", "fs": 1000, "fc": 25.0, "q": 1.0, "gain": 3.2, "count": 3}, ' \
'{"_type": "PeakingEQ", "fs": 1000, "fc": 50.0, "q": 3.2, "gain": -5.0}' \
']}'
assert output == expected
decoded = filter_from_json(json.loads(output))
assert decoded is not None
assert isinstance(decoded, CompleteFilter)
assert decoded.description == 'Hello from me'
assert decoded.filters is not None
assert len(decoded.filters) == len(filter.filters)
assert decoded.getTransferFunction() is not None
assert isinstance(decoded.filters[0], filter.filters[0].__class__)
assert filter.filters[0].fs == decoded.filters[0].fs
assert filter.filters[0].type == decoded.filters[0].type
assert filter.filters[0].order == decoded.filters[0].order
assert filter.filters[0].freq == decoded.filters[0].freq
assert isinstance(decoded.filters[1], filter.filters[1].__class__)
assert filter.filters[1].fs == decoded.filters[1].fs
assert filter.filters[1].q == decoded.filters[1].q
assert filter.filters[1].gain == decoded.filters[1].gain
assert filter.filters[1].freq == decoded.filters[1].freq
assert filter.filters[1].count == decoded.filters[1].count
assert isinstance(decoded.filters[2], filter.filters[2].__class__)
assert filter.filters[2].fs == decoded.filters[2].fs
assert filter.filters[2].q == decoded.filters[2].q
assert filter.filters[2].gain == decoded.filters[2].gain
assert filter.filters[2].freq == decoded.filters[2].freq
def __convert_to_filter(filter_params, id):
ft = int(filter_params['FilterType']) if SyncHTP1Dialog.__has_filter_type(filter_params) else 0
if ft == 0:
return PeakingEQ(HTP1_FS, filter_params['Fc'], filter_params['Q'], filter_params['gaindB'], f_id=id)
elif ft == 1:
return LowShelf(HTP1_FS, filter_params['Fc'], filter_params['Q'], filter_params['gaindB'], f_id=id)
elif ft == 2:
return HighShelf(HTP1_FS, filter_params['Fc'], filter_params['Q'], filter_params['gaindB'], f_id=id)
def filter_from_json(o):
'''
Converts a dict (parsed from json) to a filter.
:param o: the dict.
:return: the filter.
'''
from model.iir import Passthrough, PeakingEQ, LowShelf, HighShelf, FirstOrder_LowPass, \
FirstOrder_HighPass, SecondOrder_LowPass, SecondOrder_HighPass, AllPass, CompleteFilter, ComplexLowPass, \
FilterType, ComplexHighPass
filt = None
if '_type' not in o:
raise ValueError(f"{o} is not a filter")
if o['_type'] == Passthrough.__name__:
if 'fs' in o:
filt = Passthrough(fs=int(o['fs']))
else:
filt = Passthrough()
elif o['_type'] == Gain.__name__:
filt = Gain(o['fs'], o['gain'])
elif o['_type'] == PeakingEQ.__name__:
filt = PeakingEQ(o['fs'], o['fc'], o['q'], o['gain'])
elif o['_type'] == LowShelf.__name__:
filt = LowShelf(o['fs'], o['fc'], o['q'], o['gain'], o['count'])
elif o['_type'] == HighShelf.__name__:
filt = HighShelf(o['fs'], o['fc'], o['q'], o['gain'], o['count'])
elif o['_type'] == FirstOrder_LowPass.__name__:
filt = FirstOrder_LowPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == FirstOrder_HighPass.__name__:
filt = FirstOrder_HighPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == SecondOrder_LowPass.__name__:
filt = SecondOrder_LowPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == SecondOrder_HighPass.__name__:
filt = SecondOrder_HighPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == AllPass.__name__:
filt = AllPass(o['fs'], o['fc'], o['q'])
elif o['_type'] == CompleteFilter.__name__:
kwargs = {}
if 'fs' in o:
kwargs['fs'] = o['fs']
filt = CompleteFilter(
filters=[filter_from_json(x) for x in o['filters']],
description=o['description'],
**kwargs)
elif o['_type'] == ComplexLowPass.__name__:
filt = ComplexLowPass(FilterType(o['filter_type']), o['order'],
o['fs'], o['fc'])
elif o['_type'] == ComplexHighPass.__name__:
filt = ComplexHighPass(FilterType(o['filter_type']), o['order'],
o['fs'], o['fc'])
if filt is None:
raise ValueError(f"{o._type} is an unknown filter type")
else:
if filt.id == -1:
filt.id = uuid4()
return filt
