But it was in that loudspeakers really became practical -- due in part to electronic amplification by a vacuum tube. By the s, they were used in radios, phonographs , public address systems and theater sound systems for talking motion pictures.
By definition, a loudspeaker is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. The most common type of loudspeaker today is the dynamic speaker. It was invented in by Edward W. Kellogg and Chester W. The dynamic speaker operates on the same basic principle as a dynamic microphone, except in reverse to produce sound from an electrical signal. Smaller loudspeakers are found in everything from radios and televisions to portable audio players, computers and electronic musical instruments.
Larger loudspeaker systems are used for music, sound reinforcement in theaters and concerts and in public address systems. Alexander Graham Bell patented his first electric loudspeaker capable of reproducing intelligible speech in as part of his telephone.
Ernst Siemens improved upon it the following year. In , Horace Short earned a patent for a loudspeaker driven by compressed air. A few companies produced record players using compressed-air loudspeakers, but these designs had poor sound quality and could not reproduce sound at a low volume. The first practical moving-coil dynamic loudspeakers were made by Peter L. Jensen and Edwin Pridham in in Napa, California.
Like previous loudspeakers, theirs used horns to amplify the sound produced by a small diaphragm. The problem, however, was that Jensen could not get a patent. So they changed their target market to radios and public address systems and named their product Magnavox.
The moving-coil technology commonly used today in speakers was patented in by Chester W. The Samsung i has a speakerphone that is quite loud. It's one of the best features, so make sure you consider it while comparing all the different products. Yes, in the calling menu, select speaker.
When you are on a speaker phone, you cannot control who hears the conversation, so essentailly no, you cannot object to anyone hearing the conversation. The only way to make the conversation private is to take the phone off of speakerphone. If you use speakerphone as a hands free option, consider a headset or bluetooth. A bluetooth speakerphone is used to enhance the experience of a bluetooth compatible phone. It allows the user to talk easily through the phone with an earpiece without having to hold the phone to their ear.
To the right of the 'call' key. Speakerphone can only be used if there is nobody else in the room except for the doctor or patient. Otherwise the risk of violating patient confidentiality is at risk. During a call you have to press then middle circle button. It's there; it's just not loud enough to hear it. One of them is a microphone the other is the speakerphone. Log in. See Answer. Best Answer. Oxford, Michael L. Kenoyer and Simon Dudley. Study guides. More answers. Q: Who invented speakerphone?
Write your answer Related questions. When was the first speakerphone invented? Do blackberry phones have a speakerphone function? How do you use the speakerphone on a Samsung m on Sprint? What models of Blackberries have speakerphones?
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But it was a seminar moment.
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