prepare 1

What is complete masking?

• The sound in one ear can be

  influenced by the perception of sound in

  another ear

• A sound (masker) can

  influence (reduce) the loudness of another

  sound (signal of interest);

• The presence of a sound

  (masker) completely mask/ cause the signal of

  interest inaudible;

Partial masking:

• The presence of a sound

  (masker) completely mask/ cause the signal of

  interest inaudible;

• The sound in one ear can be

  influenced by the perception of sound in

  another ear

• A sound (masker) can

  influence (reduce) the loudness of another

  sound (signal of interest)

Central masking

• A sound (masker) can

  influence (reduce) the loudness of another

  sound (signal of interest)

• The presence of a sound

  (masker) completely mask/ cause the signal of

  interest inaudible;

• The sound in one ear can be

  influenced by the perception of sound in

  another ear

the process where one signal is made ------- because of another signal that is present either at

the same time or very close in time-------

Two terminologies

• signal

• masker

• time

The amount of masking :

the difference

(in dB) between the ----- (without the masker) and in the

--- of the masker.

The ----- the amount of ----- in different masking

situations, the ---- the influence the

masker has on the -----.

• lower,lower

• greater, greater

• masking

  demonstrated,

  audibility of the signal

• stimulus, masking presence

The experiment: Hawkins & Stevens (1950)

Masking effect of __ intensity levels (20-90 dB SL) of a wideband noise masker on __ pure tones, ranging from 100 – 9000 Hz.

Wideband noise masker (white noise): a ___ with equal energy throughout a very broad ___ range

Both masker and signal were delivered ___, under headphones, to __ listeners.