VEL Video Mixer for the BBC Micro Beeb-Lock

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VIDEO MIXER FOR THE BBC MicroCOMPUTER. An amazing piece of BBC kit. It is called a VEL BEEB-LOCK, and essentially it is a video mixer specially designed to take BBC computer video output and mix it with another video source.

You can then choose to show either the BBC output or the video source output (eg a VCR tape) on screen, or you can mix the two so that the BBC output overlays the other signal. In this way you can produce video titling on the humble Beeb.

More than that, you can fade the BBC output or the video output manually to create special on-screen effects. The way that it works is by having a special extra circuit inside the BBC Micro producing an extra video signal suitable for video mixing.

The unit that you can see has inputs on the back for both the normal RGB signal and the special extra signal, and there is an RGB output to a normal BBC monitor. In this way you can always see the normal BBC picture.

The back of the unit also has an input for a video source such as a VCR, plus a mixed output in the form of a composite video signal that goes to another monitor capable of handling it. By using two monitors you can then see the normal BBC output and the mixed signal output at the same time.

The mixed signal can be recorded of course in the normal way. The BEEB-LOCK can even be used to mix two video signals independently of a BBC Micro (eg two VCR outputs) increasing its versatility, and the instructions say that it produces broadcast quality output.

Date : 1985

Manufacturer : VEL

This exhibit has a reference ID of CH31237. Please quote this reference ID in any communication with the Centre for Computing History.

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