Shift

class auglib.transform.Shift(duration=None, *, unit='seconds', preserve_level=False, bypass_prob=None)

Shift signal without changing its duration.

The signal will be read from the position given by duration, and the skipped samples from the beginng will be added at the end.

Parameters:

• duration (int | float | auglib.core.observe.Base | auglib.core.time.Time) – duration of shift

• unit (str) – literal specifying the format of duration (see auglib.utils.to_samples())

• preserve_level (bool | auglib.core.observe.Base) – if True the root mean square value of the augmented signal will be the same as before augmentation

• bypass_prob (float | auglib.core.observe.Base) – probability to bypass the transformation

Examples

Shift a speech signal by 1 s.

>>> import audb
>>> import audiofile
>>> import audplot
>>> import auglib
>>> transform = auglib.transform.Shift(1)
>>> files = audb.load_media("emodb", "wav/03a01Fa.wav", version="1.4.1")
>>> signal, sampling_rate = audiofile.read(files[0])
>>> augmented_signal = transform(signal, sampling_rate)
>>> audplot.waveform(augmented_signal)

__call__()

Shift.__call__(signal, sampling_rate=None)

Apply transform to signal.

Parameters:

• signal (numpy.ndarray) – signal to be transformed

• sampling_rate (int) – sampling rate in Hz

Return type:

numpy.ndarray

Returns:

augmented signal

Raises:

• ValueError – if the signal shape is not support by chosen transform parameters

• ValueError – if sampling_rate is None, but the transform requires a sampling rate

• RuntimeError – if the given sampling rate is incompatible with the transform

arguments

Shift.arguments

Returns arguments that are serialized.

Returns:

Dictionary of arguments and their values.

Raises:

RuntimeError – if arguments are found that are not assigned to attributes of the same name

Examples

>>> import audobject.testing
>>> o = audobject.testing.TestObject("test", point=(1, 1))
>>> o.arguments
{'name': 'test', 'point': (1, 1)}

borrowed_arguments

Shift.borrowed_arguments

Returns borrowed arguments.

Returns:

Dictionary with borrowed arguments.

from_dict()

static Shift.from_dict(d, root=None, **kwargs)

Return type:

audobject.core.object.Object

from_yaml()

static Shift.from_yaml(path_or_stream, **kwargs)

Return type:

audobject.core.object.Object

from_yaml_s()

static Shift.from_yaml_s(yaml_string, **kwargs)

Return type:

audobject.core.object.Object

hidden_arguments

Shift.hidden_arguments

Returns hidden arguments.

Returns:

List with names of hidden arguments.

id

Shift.id

Object identifier.

The ID of an object ID is created from its non-hidden arguments.

Returns:

object identifier

Examples

>>> class Foo(Object):
...     def __init__(self, bar: str):
...         self.bar = bar
>>> foo1 = Foo("I am unique!")
>>> foo1.id
'893df240-babe-d796-cdf1-c436171b7a96'
>>> foo2 = Foo("I am different!")
>>> foo2.id
'9303f2a5-bfc9-e5ff-0ffa-a9846e2d2190'
>>> foo3 = Foo("I am unique!")
>>> foo1.id == foo3.id
True

is_loaded_from_dict

Shift.is_loaded_from_dict

Check if object was loaded from a dictionary.

Returns True if object was initialized from a dictionary, e.g. after loading it from a YAML file.

Returns:

True if object was loaded from a dictionary,

otherwise False

resolvers

Shift.resolvers

Return resolvers.

Returns:

Dictionary with resolvers.

short_id

Shift.short_id

Short object identifier.

The short ID consists of eight characters and is created from its non-hidden arguments.

Returns:

short object identifier

Examples

>>> class Foo(Object):
...     def __init__(self, bar: str):
...         self.bar = bar
>>> foo1 = Foo("I am unique!")
>>> foo1.id
'893df240-babe-d796-cdf1-c436171b7a96'
>>> foo1.short_id
'171b7a96'
>>> foo2 = Foo("I am different!")
>>> foo2.short_id
'6e2d2190'
>>> foo3 = Foo("I am unique!")
>>> foo1.short_id == foo3.short_id
True

to_dict()

Shift.to_dict(*, include_version=True, flatten=False, root=None)

Converts object to a dictionary.

Includes items from audobject.Object.arguments. If an argument has a resolver, its value is encoded. Usually, the object can be re-instantiated using audobject.Object.from_dict(). However, if flatten=True, this is not possible.

Parameters:

• include_version (bool) – add version to class name

• flatten (bool) – flatten the dictionary

• root (str) – if file is written to disk, set to target directory

Return type:

collections.abc.Mapping[str, typing.Union[bool, datetime.datetime, dict, float, int, list, None, str]]

Returns:

dictionary that represent the object

Examples

>>> import audobject.testing
>>> o = audobject.testing.TestObject("test", point=(1, 1))
>>> o.to_dict(include_version=False)
{'$audobject.core.testing.TestObject': {'name': 'test', 'point': [1, 1]}}
>>> o.to_dict(flatten=True)
{'name': 'test', 'point.0': 1, 'point.1': 1}

to_samples()

Shift.to_samples(value, sampling_rate=None, *, length=None, allow_negative=True)

Convert duration value to samples.

Return type:

int

to_yaml()

Shift.to_yaml(path_or_stream, *, include_version=True)

Save object to YAML file.

Parameters:

• path_or_stream (str | io.IOBase) – file path or stream

• include_version (bool) – add version to class name

to_yaml_s()

Shift.to_yaml_s(*, include_version=True)

Convert object to YAML string.

Parameters:

include_version (bool) – add version to class name

Return type:

str

Returns:

YAML string

Examples

>>> import audobject.testing
>>> o = audobject.testing.TestObject("test", point=(1, 1))
>>> print(o.to_yaml_s(include_version=False))
$audobject.core.testing.TestObject:
  name: test
  point:
  - 1
  - 1