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decibel audio

measurement examples

Audio Measurement Examples

measured in decibels in Carlsbad Ca., USA

Audio Measurement Technique

The data was taken on 6/20/02-7/8/02 by a degreed Electronics Engineer using a Radio Shack Digital Sound Level Meter #33-2055, with meter specs: +- 2 db at 126 decibels. Time averaging was used for sound tests: approx. 10 seconds where possible. Note that blanks in the below chart means no data was taken.

ITEM	APPROX DISTANCE	MIN	AVG	MAX

PALOMAR AIRPORT NOISE		note:higher=louder
Private Jet, Taking Off	In Airport, at closest public point		100	> 100
Jet Plane, on runway	In Airport, at closest public point	79	83	90
Prop Plane near runway	In Airport, at closest public point	74	83	90
Prop Plane taxi	In Airport, at closest public point	73	78	80
Prop Bi-plane taking off	In Airport, at closest public point	72	77	89
Prop Plane flying overhead	In Airport, at closest public point	75	77	81
Helicopter in air, measurement #2	In Airport, at closest public point	63	76	72
Jet Engine, low Idle in Hangar	300 yds away	62	73	80
Jet Engine, low Idle in Hangar	300 yds away	64	72	80
Helicopter in air	In Airport, at closest public point	66	72	77
Ambient Noise, no takeoffs	closest parking lot	63	67	71

TRAFFIC NOISE
Palomar & Melrose, Truck #2	during traffic, from corner sidewalk	85	98	> 100
Mustang accelerating	next lane to our vehicle		96
Left Turns, Palomar onto Melrose	during traffic, from corner sidewalk		95
Car Moving in Traffic 55mph	inside car, a foot from open window		94	99
Palomar & Melrose, Truck #3	during traffic, from corner sidewalk	90	94	98
Palomar & Melrose, Truck #1	during traffic, from corner sidewalk	85	90	94
Palomar & Melrose, UPS Truck	during traffic, from corner sidewalk	81	88	> 90
Car Moving in Traffic 30mph	inside car, a foot from open window		87	97
Melrose Traffic #1	from sidewalk		87	91
Melrose single Motorcycle	from sidewalk		84	88
Palomar & Melrose, 5:30 pm #1	during traffic, from corner sidewalk	< 80	82	93
Palomar & Melrose, 5:30 pm #2	during traffic, from corner sidewalk	< 80	82	85
Quiet Traffic, Source not moving	traffic corner in Encinitas		80
Rancho Carillo, Melrose direction	6 houses from Melrose Drive	60	68	80
Car shut off, windows down	Inside, no accessories on		50

HOUSEHOLD NOISE
AVIS AC at airport	15 feet away		85
Rancho Carrillo Outside Ambient	lot #6 Estates, front	< 50	58	65
Neighbors Air Conditioning Unit	25 feet away	51	57	65
Quiet tv in Rancho Carrillo House	inside, windows closed	<50	54	67
Quiet Rancho Carillo House	inside, windows closed		50

note: Rancho Carrillo is a neighborhood residential area, normally considered a quiet place

note: Palomar and Melrose are large streets within Carlsbad California

note: Palomar airport is a local Carlsbad airport actually having the most take offs and landings in San Diego County. However, the planes there are mostly single engine or dual engine prop plans plus some "for-hire" small jets. No large jet airplanes are at this airport.

Some conclusions

1. The jet taking off nearby and the trucks were tied for "most annoying"; the Mustang next

2. Except for the jet taking off, many traffic sounds were louder (more decibels) than the airport sounds

3. In Palomar Airport parking lot, most noise was heard coming from Palomar Airport Road

4. After a while, our ears were trained and told the same story as the sound meter - which was - it was often hard to listen for the planes, even on Palomar Airport Road and Melrose Dr. over the traffic

5. The airport being quieter is expected likely due to the smaller planes in use there, which are of course, mostly further away than traffic. If larger jets were in use , a different result is likely.

6. Some noises can be more disturbing that others. Seemingly random noise, called Gaussian or white noise, such as wind or ocean surf is often ignored by us. For example, noise outside our house was up to 15 db higher - enormously higher than inside -. But it was mostly wind, which the ears ignore. Trucks, jets, motorcycles, prop planes, people voices, and many cars, are of course noticeable.

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