engineeringhistory:

HP 82950A Modem, introduced in 1982. The modems operated at 300 baud, capable of transferring approximately 25 bytes per second.

engineeringhistory:

HP 82950A Modem, introduced in 1982. The modems operated at 300 baud, capable of transferring approximately 25 bytes per second.

The video shows an experiment recovering sound from a high-speed video footage with muted or no sound. Besides its arguably cool demonstration value, the guys at CIA/NSA/Mossad are probably watching the concept closely, as the video shows picking up human speech from behind a sound-proof door from the image of a bag of chips.

(Source: gdn001)

Excellent animation of the continuous Fourier transform.

Excellent animation of the continuous Fourier transform.

(Source: xyprogramming, via lizabethgregorya)

bluedogeyes:

Cornell Aeronautical Labs Man-Amplifier (1961) (via cyberneticzoo)

Cornell Aeronautical Laboratories of Buffalo, New York  were producing papers on Man Amplifiers as early as 1960. In 1961 they received a grant to explore these ideas. Initial work was on an exoskeleton, and later work on a mock-up.

There are some initial concepts one has to be aware of in understanding Man Amplifiers.

Typically there is a master component, and a slave component. In other teleoperated manipulators, they are physically and spatially separate.  In the exoskeleton man-amplifier, they are together. In the Cornell Man-Amplifier, one of the problems encountered was the close proximity of the control harness (master) with the powered exoskeleton.

You will often see the phrase “bilateral force feedback with force reflection”.

image

Bilateral force feedback meaning that both the master and slave units have common joints and position and force information can be transmitted in both directions (from operator to task and vice versa).  Force feedback is when, for example, an obstacle is met with some resistance, that the resistance is felt back at the master. E.g. if you were to place an object next to a wall, you, as the operator, would feel the wall if the object being held by the slave unit touched it.

Force reflection is force feedback but the power can also be amplified. A force-reflection ratio of 1:1 would be normal force-feedback (compensation for the units weight and inertia). A ratio of 1:10 would mean that, for example, the person operating the master unit would lift an object of 1 kilogram would amplify to 10 kilograms at the powered slave end.  The ratio can also go in the other direction and could apply to manipulators such as those used for surgical procedures.

The first prototype man amplifier wasn’t to be seen until General Electric built their Hardiman I, based on results from the Cornell research.”