A Wireless Device works without using cables to communicate.

Transmitter: A transmitter is basically converting an audio signal to a radio signal and broadcasting it through the antenna. The antenna is one the most important parts in the transmitter. It is used as either a transmitter or a receiver. In this transmitter box the antenna works as a transmitter to send audio signals to the receiver. The transmitter must handle expected ranges of input levels and present the correct impedance to the source. In some cases the power of the transmitter is based on the input devices but in general it requires a 9volt battery to operate. The first process of the transmitter is to minimize the distortion that was added during transferring the audio signal from the input. The second process is to compress the audio signal with in a limited dynamic range of a radio transmission. Finally, the transmitter then sends an audio signal to the receiver through the frequency multiplier. Moreover, wireless transmitters come in three different forms: body pack, handheld, and plug-on.

Receiver: Receivers are available in two kinds known as fixed and portable. The basic idea of a receiver is to pick up the radio signal that was transmitted from a transmitter and convert it to an audio signal. The receiver comes with a built in antenna that can detect signals coming as a radio signal. The first step of the receiver is to reject unwanted radio signals from the transmitter. The second step of the receiver is to generate a constant radio signal using the Local Oscillator. Finally, the receiver will detect the audio signal from the transmitter and send the audio signal to the mixer.

Mixer: A mixer is simply where we can connect all the audio systems to it. It is some type of system that can eliminate distortion and feedback. It has the ability to mix sound to improve the quality and be able to send an audio signal to the speaker. In other words, we can say a mixer is some kind of sound editor. Basically, the receiver will be connected to the mixer to send audio signals that were coming from a transmitter. The mixer will then send the final sound improvements to the speaker.

Speaker: Basically, the speaker is a final stage where we can hear an audio sound from input devices. It consists of a cone, suspension, basket, coil and magnet. The cone is made out of paper and usually attached to the suspension where the suspension allows the cone to move up and down. It is then attached to the driver metal called the basket. The magnet is connected to the coil with negative and positive wires to produce an electric field. With enough electric field the coil will start to move up and down in the air and create sound waves.

Basic Operation

As shown in figure 1, a guitar as an input device connects to the transmitter to send an audio signal. A transmitter that requires a 9volt battery will then transmit the audio signal to the receiver as a radio signal. The antenna is the part of the transmitter that sends the audio signal to the receiver. The receiver will receive the radio signal from the transmitter and then convert it back to an audio signal. Finally, the receiver will now send an audio signal to the mixer where the mixer sends the final audio signal to the speaker. The speaker then produces sound where we can understand.

Sound Output

Figure 1 Flow Chart for Wireless Device Operation

Conclusion

This wireless device will eliminate the use of cables to connect to the sound system. It means musicians have more freedom to move around on the stage.

Work Cited

Harris, Tom. "How Speakers Work." How Stuff Works. http://electronics.howstuffworks.com/speaker2.htm. Nov 17, 2003.

"How the Guitar Works." Flash Guitar.

http://www.reggieband.com/flash_guitar/noflash/tutorial/how_guitar_works/. Nov 17, 2003.

"Introduction to Wireless Systems." Shure.

http://www.shure.com/booklets/intro/intro_to_wireless.html. Oct 5, 2003.

Lemme, Helmuth E. W. "The Secrets of Electric Guitar Pickups." BuildYourGuitar.com. July 2003.

http://www.buildyourguitar.com/resources/lemme/. Oct 5, 2003.