13. By definition, masking tones make it harder to hear a test tone. Imagine tha

Question

13. By definition, masking tones make it harder to hear a test tone. Imagine that a test tone is 1000 Hz. Which of the following would be true? a. Masking is likely to be greater with a 1500 Hz masker than with a 500 Hz masker. b. Neither 500 Hz nor 1500 Hz tones is likely to impact ability to hear the test tone. c. Masking with a 500 Hz masker is likely to be the same as with a 1500 Hz masker. d. Masking with a 500 Hz masker is likely to be greater than with a 1500 Hz masker e. None of the above is true

Explanation / Answer

A masker makes a louder sound quiter with a nearby frequency.

The masking has following properties :

1. For effective masking, the frequency of masker must lie in the critical bandwidth

2. Lower mask higher frequencies better (given condition 2 holds true)

critical bandwidth is generally taken 15% of the signal frequency

so, in our case, effective masking will occur between frequencies 1000 +/- 150Hz

i.e. in the range 850 to 1150Hz

that means, neither of 500Hz and 1500Hz frequencies will be able to mask tone.

Hence, option b is correct

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