What is masking in pure tone audiometry?

What is masking in pure tone audiometry?

Masking means that one puts in some “noise” in the opposite ear while testing an ear. The reason to do this is to prevent sound from the side being tested from going over to the good side This is called the “cross-over problem”.

What is audiometric masking?

Masking is a procedure audiologists use while testing to separate the two ears, acoustically. Instead, noise is introduced to one ear while the other ear is tested with a tone (or speech signal). To indicate that the hearing thresholds were obtained using masking, masked threshold symbols are used on the audiogram.

When Should masking be used in audiology?

Masking. If the unmasked bone-conduction threshold is 10 dB better than the air-conduction threshold at that frequency in either ear, masking must be used.

What is masking in microprocessor?

The masking is basically ANDing two numbers. When we want to mask the upper nibble of an 8-bit number say 2D (0010 1101), then we will AND with 0F (0000 1111), so we will get 0D (0000 1101). By masking with F0 (1111 0000), the result will be 20 (0010 0000). Now by shifting the upper nibble, we will get 02 (0000 0010).

What do you understand by masking?

noun. the act or practice of masking. psychol the process by which a stimulus (usually visual or auditory) is obscured by the presence of another almost simultaneous stimulus.

How do you determine if masking is needed?

A general rule is to compare the air conduction thresholds of the test ear with the bone conduction thresholds of the non-test ear. When using supra-aural earphones, if the difference between the non-test ear BC and test ear AC thresholds is 40 dB or more, then you should mask.

What is effective masking level?

EMLs are determined by presenting the signal and the masker to the same ear; effective masking refers to the lowest level of noise required to mask a signal to 50% probability of detection for a large group of normal-hearing adults (e.g., Hood, 1960 ; Studebaker, 1967).

Why masking is used in microprocessor?

It provides the ability for selectively disabling the interrupts. An interrupt pin which is already masked cannot interrupt, even though the interrupt pin is still in active state and the interrupts which are generally enabled using the EI set of instructions.

What is masking in DTP?

When talking about editing and processing images the term ‘masking’ refers to the practice of using a mask to protect a specific area of an image, just as you would use masking tape when painting your house. Masking an area of an image protects that area from being altered by changes made to the rest of the image.

What does masking mean in microprocessor?

In computer science, a mask or bitmask is data that is used for bitwise operations, particularly in a bit field. Using a mask, multiple bits in a byte, nibble, word etc. can be set either on, off or inverted from on to off (or vice versa) in a single bitwise operation.

When to mask the nontest ear in pure tone audiometry?

Studebaker 1 suggested that the nontest ear should be masked during pure-tone air-conduction testing whenever the presentation level at the test ear exceeds the unmasked bone-conduction threshold of the nontest ear by more than 40 db.

How is air conduction used in pure tone audiometry?

Air conduction pure tone audiometry It is possible for sounds introduced into the test ear via headphones to be carried by bone conduction across the skull and stimulate the cochlea of the non-test ear. The amount of sound energy that is lost as it crosses the skull is known as transcranial attenuation.

How is masking noise introduced into the ear?

The bone conduction vibrator is placed on the mastoid process of the test ear. Masking noise is introduced to the non-test ear through an insert earphone which is placed in the ear canal and held in place by a hook over the pinna. The tone is introduced via headphone into the test ear.

When to use masking during bone conduction testing?

On the other hand, the nontest ear should be masked during bone-conduction testing anytime an unmasked air-bone gap is observed on the test ear. 2 Thus, the problem clinically is not in determining when masking is indicated or even the type of masking noise that is the most efficient. The main problem is in determining how much 1.