Equalisation Flashcards

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1
Q

What was equalisation originally invented for?

A

Compensating for tonal inadequacies in audio equipment

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2
Q

What is equalisation?

A

The process by which different frequency ranges are increased or decreased in volume

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3
Q

What are hardware EQs limited by?

A

The components used in the manufacture and design of the unit, including the space on the front panel for the necessary controls

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4
Q

What can plug-in EQs offer?

A

Almost limitless features and combinations of filter types

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5
Q

What does a filter do?

A

lets some of the audio signal through without changing it, but will cut or boost the signal level of a specific frequency range

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6
Q

On a filter, what does the cutoff frequency do?

A

Determines which frequencies will be passed unaffected and which frequencies will be removed

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7
Q

On a filter, what does the Centre frequency do?

A

Determines the frequency around which a band pass filter allows frequencies to pass through

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8
Q

On a filter, what does the gain control do?

A

Determine show much cut or boost is applied to the affected frequencies

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9
Q

On a filter, what is resonance?

A

Characteristic narrow boost of the frequencies around the cutoff

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10
Q

On a filter, what is the Q?

A

The width of a band pass filter or parametric EQ

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11
Q

On a filter, what does a high Q value mean?

A

The filter is very narrow

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12
Q

On a filter, what does the slope do?

A

Determines how sharply the filter will act at its cutoff frequency

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13
Q

What does a low pass filter do?

A

Reduces the level of all frequencies above the cutoff

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14
Q

True or False, low pass filters can be used to reduce hiss on a recording?

A

True

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15
Q

What happens to the pitch if you double the frequency?

A

It becomes an octave higher

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16
Q

What does a high pass filter do?

A

Removes frequencies below the cut-off frequency

17
Q

What is a common use of a high pass filter?

A

As a rumble filter - eliminates unwanted low frequency sounds

18
Q

What can a high pass filter be used to reduce the effects of?

A

Plosive sounds and the proximity effect

19
Q

How does resonance sound?

A

Whistly

20
Q

What does a band pass filter do?

A

Remove frequencies on either side of a centre frequency range

21
Q

In what guitar pedal is a band pass filter used and how?

A

Wah Wah pedals - the centre frequency is swept to give the characteristic effect

22
Q

What does a parametric EQ do?

A

Boosts or cuts around a variable centre frequency

23
Q

What is a parametric EQ useful fo?

A

Adjusting the amplitude of a specific frequency range, but without altering all the frequencies above and below

24
Q

What is a semi-parametric EQ?

A

A parametric EQ with a fixed Q/bandwidth

25
Q

What could a parametric EQ cut be used to reduce?

A

A resonance or node

26
Q

What does a shelving filter do?

A

Allows the user to cut or boost the signal beyond a specific frequency

27
Q

What are shelving filters most commonly used on?

A

Consumer audio equipment and the treble/bass controls on guitar amplifiers

28
Q

What can a low shelf boost be used for?

A

Increasing the low frequencies on a kick drum or bass guitar part

29
Q

What is a high shelf boost often used for?

A

Bringing something forward in the mix or to add clarity to drum overheads

30
Q

What do graphic EQs use to individually boost or cut specific parts of the frequency spectrum?

A

A bank of filters

31
Q

What are graphic EQs common used in?

A

Live sound to correct the frequency response of a room/speaker system, and sometimes to reduce feedback