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System Specifications

Module by: Ryan Pei. E-mail the author

Summary: Here are some design specifications that we kept in mind while building the actual hardware for the tin-can telephone.

  • Used sewing thread string, considered the lightest material and therefore the most sensitive to vibrations; also tried using copper wire and fishing line
  • Instead of tin cans we used paper cups, since the paper diaphragm on the cup’s bottom is more mobile than that of the tin can, meaning it can better drive the string’s vibrations; also considered plastic cups
  • Each cup is raised off the ground on a wooden stand several feet tall, to make sure the audio that leaks from the system does not bounce off the floor and hit the system directly again, causing multipath
  • The stands also allow us to gauge the length at which we keep the cups separated, as the distance determines the tension in the string in between them, and any change in the string’s tension has a tremendous effect on the impulse response, which we cannot afford to change since we are modulating the sub-carriers over very specific frequencies
  • Styrofoam is used to separate the cups from the wooden stands, so that the cups do not vibrate the whole stand as much
  • The receiver cup with the microphone placed in it is padded with foam as well to keep multipath effects at a minimum
  • Speaker used for the transmitter had an output diameter that matched the diameter of the mouth of the cup to minimize leakage of audio from the transmitter
Figure 1
Figure 1 (graphics1.jpg)

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Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks