Example #1
0
 def item_type(self):
     if self.is_countable:
         return type(self.items[0])
     else:
         first, items = cytoolz.peek(self.items)
         self.items = items
         return type(first)
Example #2
0
def vdl(signal, times, delay, initial_value=0.0):
    """Variable delay line which delays `signal` at 'times' with 'delay'.

    :param signal: Signal to be delayed.
    :type signal: Iterator
    :param delay: Delay.
    :type delay: Iterator
    :param initial_value: Sample to yield before first actual sample is yielded due to initial delay.

    .. note:: Times and delay should have the same unit, e.g. both in samples or both in seconds.
    """
    dt0, delay = cytoolz.peek(delay)
    times, _times = itertools.tee(times)

    # Yield initial value before interpolation kicks in
    # Note that this method, using tee, buffers all samples that will be discarded.
    # Therefore, room for optimization!
    n = 0
    if initial_value is not None:
        while next(_times) < dt0:
            n += 1
            yield initial_value

    times1, times2 = itertools.tee(times)
    interpolated = interpolate_linear(map(operator.add, times2, delay), signal, times1)
    yield from cytoolz.drop(n, interpolated)  # FIXME: move drop before interpolation, saves memory
Example #3
0
def vdl(signal, times, delay, initial_value=0.0):
    """Variable delay line which delays `signal` at 'times' with 'delay'.

    :param signal: Signal to be delayed.
    :type signal: Iterator
    :param delay: Delay.
    :type delay: Iterator
    :param initial_value: Sample to yield before first actual sample is yielded due to initial delay.

    .. note:: Times and delay should have the same unit, e.g. both in samples or both in seconds.
    """
    dt0, delay = cytoolz.peek(delay)
    times, _times = itertools.tee(times)

    # Yield initial value before interpolation kicks in
    # Note that this method, using tee, buffers all samples that will be discarded.
    # Therefore, room for optimization!
    n = 0
    if initial_value is not None:
        while next(_times) < dt0:
            n += 1
            yield initial_value

    times1, times2 = itertools.tee(times)
    interpolated = interpolate_linear(map(operator.add, times2, delay), signal,
                                      times1)
    yield from cytoolz.drop(
        n, interpolated)  # FIXME: move drop before interpolation, saves memory
Example #4
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 def peek(self):
     """Check the first item in the stream."""
     first, self._iterator = cytoolz.peek(self._iterator)
     return first
Example #5
0
 def peek(self):
     """Check the first item in the stream."""
     first, self._iterator = cytoolz.peek(self._iterator)
     return first
Example #6
0
 def peek(self):
     first, seq = cytoolz.peek(self)
     self = self.__class__(seq)
     return first