wavread

load .wav sound file

Calling Sequence

y=wavread(wavfile)
y=wavread(wavfile,ext)
[y,Fs,bits]=wavread(wavfile)
[y,Fs,bits]=wavread(wavfile,ext)

Arguments

:wavfile string (The .wav extension is appended if no extension is

given)

: :Fs integer, frequency sampling in Hz (number of samples per

second).

: :ext string ( ‘size’) or string(‘info’) or integer (to read n

samples) or 1 x 2 integer vector [n1,n2] (to read from n1 to n2).

:

Description

Utility function to read .wav sound file. wavread(wavfile) loads a sound file specified by the string wavfile, returning the sampled data in y. Amplitude values are in the range [-1,+1]. Supports multi- channel data in the following formats: 8-bit mu-law, 8-, 16-, and 32-bit linear, and floating point.

[y,Fs,bits]=wavread(wavfile) returns the sample rate (Fs) in Hertz and the number of bits per sample used to encode the data in the file.

wavread(wavfile,n) returns the first n samples from each channel.

wavread(wavfile,[n1,n2]) returns samples n1 to n2.

wavread(wavfile,’size’) returns the size of the audio data contained in the file in place of the actual audio data, returning the vector as [channels samples].

wavread(wavfile,’info’) returns information about the audio data contained in the file in place of the actual audio data, returning the vector as [data format, number of channels, samples per second per channel, estimate of bytes per second needed, byte alignment of a basic sample block, bits per sample, length of sound data in bytes, bytes per sample (per channel)].

Examples

wavread("SCI/modules/sound/demos/chimes.wav","size")
[y,Fs,bits]=wavread("SCI/modules/sound/demos/chimes.wav");Fs,bits
`subplot`_(2,1,1)
`plot2d`_(y(1,:)) // first channel
`subplot`_(2,1,2)
`plot2d`_(y(2,:)) // second channel
y=wavread("SCI/modules/sound/demos/chimes.wav",[1 5]) //the first five samples

See Also

• auread load .au sound file
• savewave save data into a sound wav file.
• analyze frequency plot of a sound signal
• mapsound Plots a sound map