Quantcast CHARACTERISTICS OF SOUND

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
1-19 The material through which sound waves travel is called the medium. The density of the medium determines the ease, distance, and speed of sound transmission. The higher the density of the medium, the slower sound travels through it. The detector acts as the receiver of the sound wave. Because it does not surround the source of the sound wave, the detector absorbs only part of the energy from the wave and sometimes requires an amplifier to boost the weak signal. As an illustration of what happens if one of these three elements is not present, let’s refer to our experiment in which a bell was placed in a jar containing a vacuum. You could see the bell being struck, but you could hear no sound because there was no medium to transmit sound from the bell to you. Now let’s look at another example in which the third element, the detector, is missing. You see a source (such as an explosion) apparently producing a sound, and you know the medium (air) is present, but you are too far away to hear the noise. Thus, as far as you are concerned, there is no detector and, therefore, no sound. We must assume, then, that sound can exist only when a source transmits sound through a medium, which passes it to a detector. Therefore, in the absence of any one of the basic elements (source, medium, detector) there can be NO sound. Q18.   Sound waves transmitted from a source are sometimes weak when they reach the detector. What instrument is needed to boost the weak signal? TERMS USED IN SOUND WAVES Sound waves vary in length according to their frequency. A sound having a long wavelength is heard at a low pitch (low frequency); one with a short wavelength is heard at a high pitch (high frequency). A complete wavelength is called a cycle. The distance from one point on a wave to the corresponding point on the next wave is a wavelength. The number of cycles per second (hertz) is the frequency of the sound. The frequency of a sound wave is also the number of vibrations per second produced by the sound source. Q19.   What are the three basic requirements for sound? CHARACTERISTICS OF SOUND Sound waves travel at great distances in a very short time, but as the distance increases the waves tend to spread out. As the sound waves spread out, their energy simultaneously spreads through an increasingly larger area. Thus, the wave energy becomes weaker as the distance from the source is increased. Sounds may be broadly classified into two general groups. One group is NOISE, which includes sounds such as the pounding of a hammer or the slamming of a door. The other group is musical sounds, or TONES. The distinction between noise and tone is based on the regularity of the vibrations, the degree of damping, and the ability of the ear to recognize components having a musical sequence. You can best understand the physical difference between these kinds of sound by comparing the waveshape of a musical note, depicted in view A of figure 1-13, with the waveshape of noise, shown in view B. You can see by the comparison of the two waveshapes, that noise makes a very irregular and haphazard curve and a musical note makes a uniform and regular curve.


Electrical News
Your Part in the Recovery
Engineers and innovators are central to the slow but ongoing...
eetimes.com
Motor Controllers Offer Improved Noise Immunity
Operating at 5V gives these digital signal controllers enhanced noise...
eetimes.com
NXP to Pick Up Its Missing IoT Link - Bluetooth Low Energy
In pursuit of the Internet of Things market, NXP Semiconductors...
eetimes.com
USB Oscilloscopes Get Beta Drivers for Open-Source Hardware
Pico Technology has released beta versions of drivers for BeagleBoneBlack...
eetimes.com
It's Alive! The 3D Printing of Living Tissues
Within a generation, we likely will not just hear of...
eetimes.com
Curiosity Killed the Cat (Just Call Me Mr. Curiosity)
Max desperately needs a cat deterrent, but how should this...
eetimes.com
Memory Design Articles: Diagnostics, Datacenters & Failures
Here's a roundup of recent design articles that are relevant...
eetimes.com
Megachips to Launch DSP-Based Sensor Fusion IC
The growing sensor-fusion controller market for smartphones and wearable devices...
eetimes.com
MediaTek Plans $49 Million Investment in China's Chip Fund
Taiwan's largest chip designer has announced it will invest $48.9...
eetimes.com
Reduce Noise When Making M-PHY Measurements
To make useful measurements on M-PHY Gear 3, you need...
eetimes.com
EEVblog #686 – Mailbag
A monster sized high definition 50fps Mailbag, with two special...
eevblog.com
Startup to Open Source Parallel CPU
Rex Computing plans a parallel processor that could deliver a...
eetimes.com
OCZ Cuts Into Read-Intensive SSD Segment
The SATA-based Saber 1000 Series is yet another option in...
eetimes.com
Infotainment Systems Drive Automotive SSD Adoption
In-vehicle entertainment and navigation systems are becoming more mainstream and...
eetimes.com
Scaling Up Text Rendering on Scaled-Down Devices
The need to support a widening range of languages and...
eetimes.com
What Is Design-to-Cost & Why Does It Matter?
Design-to-Cost should be part of your design process. With a...
eetimes.com
Can Japan Get Her Groove Back With IoT?
Japan once looked like a world leader in smart home...
eetimes.com
The 10 Commandments of Electronics
Although these 'commandments' are presented in a humorous manner, they...
eetimes.com
Broadband Demand Hits the High Seas
Cruise ship operators Royal Caribbean and Carnival are exploring new...
eetimes.com
Anritsu ShockLine VNAs Receive Frost & Sullivan Award
Its line of "faceless" VNA used for production RF T&M...
eetimes.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +