Question on critical-band and critical-band rate usage?



Asked by: Emily Smith

How many critical bands a person can have?





twenty four critical bands

There are twenty four critical bands in the human hearing range. Each band is referred to as a ‘bark’. Together the 24 bands are called the ‘bark scale’ as shown in Table 1. The bandwidths of the critical bands are approximately constant (around 100 Hz) for frequencies below 500 Hz.

What happens when two sounds share a critical bandwidth?

Another feature of critical bandwidth is that when two pure tones of similar intensity and with a frequency difference falling within the critical bandwidth are sounded the resulting perception of the loudness will be less than if the difference between them exceeded the critical bandwidth.

How is critical bandwidth measured?

It may also be measured by taking a SINE TONE barely MASKed by a band of WHITE NOISE around it; when the noise band is narrowed until the point where the sine tone becomes audible, its width at that point is the critical bandwidth.

What is the use of critical band filters in audio compression?





The auditory filter can reduce the effects of a masker when listening to a signal in background noise using off-frequency listening. This is possible when the centre frequency of the masker is different from that of the signal.

What is masking in psychoacoustics?

We have masking sounds meaning other sounds present and this comes and brings us to the masking experiment. Now in the simplest case. We just take a white noise. And we play a tone in that noise.

How wide is a critical band?

The critical band (bandwidth) varies with frequency: it is about 90 Hz wide for a sound frequency of 200 Hz, increasing to a width of about 900 Hz for a 5000 Hz sound. this corresponds to a region on the BM of essentially 1.2 mm (covering a range of about 1300 receptor cells).

What is upward spread of masking?

The upward spread of masking refers to the higher growth rate of masking for maskers lower in frequency than the signal, compared to maskers at the signal frequency (Wegel RL, Lane CE. The auditory masking of one pure tone by another and its possible relation to the dynamics of the inner ear.

What is forward masking?

Forward masking occurs when a sound (the signal) cannot be perceived due to the presence of a preceding sound (the masker). In a typical adult experiment, three intervals are presented to the listener, two of which contain only the masker sound and one of which contains the masker followed by the signal.



What is central masking?

Central masking occurs when the test sound is presented to one ear and the masking sound to the other. The arising threshold shift is very small and rarely exceeds 10 dB. It is maximum when the masking sound is presented in bursts and the threshold is determined at the onset of the bursts.

How can we avoid frequency masking?

Making a good panning strategy: With panning, we can avoid frequency masking. If you have two or more elements living in the same frequency range, you can distribute them on the stereo field, at different locations.

What is Masker and Maskee?

1) Narrow band noise masking tone Masker = Narrow band Noise Maskee = Tone • Narrow band means signal bandwidth is less than or equal to bandwidth of critical band(CB).



What causes frequency masking?

Dad: The frequency masking is caused when a low-tone sound makes the high-tone be heard difficult if there is a certain difference in tones between the two occurred at the same time. The masking occurs also when there is a certain time-delay between the two sounds.

What is frequency slotting?

Some people know of it as frequency slotting. It’s essentially the act of giving each instrument or vocal, or at least the most important parts, their own space within the frequency spectrum, their own corner of the mix, as to say.

What is backwards masking?

Backward masking occurs when a visual stimulus is shown and quickly followed by another visual stimulus that MASKS the first stimulus. Typically, the masked image is similar to the feared stimulus in color and texture, but the mask does not contain an image or object.