One of the types of objects in Praat. For tutorial information, see Intro 4. Pitch analysis.
A Pitch object represents periodicity candidates as a function of time. It does not mind whether this periodicity refers to acoustics, perception, or vocalcord vibration. It is sampled into a number of frames centred around equally spaced times.
Pitch commands
Creation:
Drawing:
Viewing and editing:
Synthesis:
Conversion:
Inside a Pitch object
With Inspect, you will see the following attributes:

x_{min}

start time, in seconds.

x_{max}

end time, in seconds.

n_{x}

the number of frames (≥ 1).

dx

time step = frame length = frame duration, in seconds.

x_{1}

the time associated with the first frame, in seconds. This will usually be in the range [xmin, xmax]. The time associated with the last frame (i.e., x_{1} + (n_{x} – 1) dx)) will also usually be in that range.

ceiling

a frequency above which a candidate is considered voiceless.

frame_{i}, i = 1 ... n_{x}

the frames (see below).
Attributes of a pitch frame
Each frame contains the following attributes:

nCandidates

the number of candidates in this frame (at least one: the `unvoiced' candidate).

candidate_{j}, j = 1 ... nCandidates

the information about each candidate (see below).
Attributes of each candidate
Each candidate contains the following attributes:

frequency

the candidate's frequency in Hz (for a voiced candidate), or 0 (for an unvoiced candidate).

strength

the degree of periodicity of this candidate (between 0 and 1).
Interpretation
The current pitch contour is determined by the path through all first candidates. If the first candidate of a certain frame has a frequency of 0, or a frequency above ceiling, this frame is considered voiceless.
Links to this page
© ppgb, December 30, 2010