Step 4: On the back of the computer tower are a number of small, round, coloured-coded sockets. The one to plug your speakers into is usually green. Before plugging this in, find out if your sound card can support multiple speakers. If it does, follow the colour coding on the back of the tower as you connect the jacks — plug the green jack into the green socket, the black jack into the black socket and so on.
Step 6: Turn on your computer and speakers and adjust the volume control. Step 7: The computer should recognise the addition of speakers to your system and will respond accordingly.
Step 8: To test that your speakers are working, play something you know has a soundtrack. You may also notice that sounds now occur when simple functions are carried out — for example, a noise when you click a button or open a window or when an email arrives.
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Activate your free 60 day trial. The industry continued to rely on more advanced horns to create amplification. The first modern loudspeaker. Above: The first prototype loudspeaker , finished in May The speaker cone is damaged.
Inside the cabinet is a groundbreaking power amplification system. Photos copyright Edison Tech Center, permission required for use. Rice of General Electric and E. They created a working prototype in Rice and Kellogg solved the final problems which led to a nice crisp sound. Previous attempts to make the loudspeaker created an unacceptable muffled sounding audio. This muffled sound was not good enough to compete with the horn which was well established in the market.
Rice and Kellogg were able to fully understand the reproduction of all the frequencies necessary to create an accurate audio sound. Their prototype had enough of a dynamic range in frequencies to be better than the horn, while possessing the ability to greatly increase loudness dB. In they filed for patents and made a speech in St. Louis to the AIEE. After several years of work they perfected it as the first commercial product of it's kind called the Radiola Loudspeaker The speaker was produced under the company name of RCA.
Above: The first speaker. The coil was stationary unlike modern speakers, the moving magnet was inside. Copper wires were insulated with cloth. This prototype was built by C. Kellogg in The speaker worked, but needed improvement to make it smaller so it could fit into radio sets.
Within a few years they improved the speaker so it could fit into a radio 20 x 12 x 16" high. An early speaker in a household radio, it uses a simple cardboard cone and small amplifier the transformer. RCA was created under pressure from the US government to have major electric technology companies work together with their various patents in order to more easily create finished products which could compete with state-sponsored European companies.
European companies like Philips and Siemens had a leadership which could easily mobilize patents for creation of products. Under the more true 'capitalist' systems in the US at the time, companies fought over patent royalties and kept secrets from each other. RCA was able to collectivize research in order to create better technology.
In addition to having a strong US company to compete internationally in the radio market, having better technology was important for the US during escalating war tensions prior to WW2. World War 1 taught the important lesson not to be left behind, and that radio technology could mean the difference between winning or losing. GE's Ernst Alexanderson was at the epicenter of wartime communication technology. He also assisted C. Rice and Kellogg during the creation of the loudspeaker.
Watch the video below to see the first prototype of the first loudspeaker:. The electrodynamic loudspeaker today comes in several types in order to produce a quality sound for a given frequency range:.
Tweeter - 2kHz - 20kHz. There are many ways to construct a tweeter today. Most are electrodynamic magnetic speakers however there are piezo-electric, electrostatic and plasma tweeters. Mid-range Speaker - - 5kHz. This speaker covers most human voice along with most instruments. Woofer - 40 - 1 kHz. The woofer goes back to work done in the s at Bell Labs.
Subwoofer - 20 - Hz. The human ear can only hear down to 20Hz. This means that it can be placed anywhere in a room and be heard from any point with the same sound quality.
Subwoofers also produce sound waves that penetrate walls easily. Needless to say it is easy to get in trouble with local noise ordinances. Subwoofers were developed in the s. RCA connectors are sometimes use, and a USB port may supply both signal and power requiring additional circuitry and only suitable for use with a computer.
When the speaker receives electrical input from a device, it sends the current through the causing it to move back and forth. Abinawan got ideas from repairing electronics for small businesses in his community, then later received a patent for his invention. The design was to separate successive keystrokes on the old flip-up style manual typewriters to keep the letters from binding up.
And, it turn out to be relatively efficient.
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