The Following is the Media Format Information Sheet for Media Distribution of slide ad audio on CD.

Three types of CD playback automation current exist

1. Scott Christopher Version 2
2. Scott Christopher Version 1 legacy. (Mono Audio)
3. Atlab

Each system uses a domestic DVD/CD player to playback the Slide Audio.

The DVD/CD player is modified to take a contact closure PLAY signal from the Automation.

A monitoring device is then used to detect PULSE signals in the audio. This sends a signal back to automation to change slide. Automation is programmed to know the number of slides expected.

Scott Christopher Version 2

This is full stereo playback with an inaudible PULSE/tone hidden on the left Audio Channel.

Following are the specifications for this system.

• No First Pulse
• 400ms Lead in before Audio starts on CD (First Track.)
• Pulse 1 second before next Audio Track starts.
• Pulse is 200ms long with 50ms fade in/out. Total 300ms.
• 18KHz, Left Channel at -15db

The CD layout is.

1. A pulse preceding each audio track.
2. The initial audio track is usually a location based pre-slide show. Welcome, etc.
   This is usually made of multiple slides. Pulses must be placed in appropriate locations to follow the audio.
3. A Pulse must be placed after the final audio track, followed by another pulse 5 seconds later as a backup to clear the projector is a problem occurred.

Scott Christopher Version 1

This is a legacy version and is being phased out.

The right channel is the Audio in MONO.
The left channel is the PULSE data. 0.5 seconds long at 1kH. -6db

The format layout of the CD is as follows.

1. 400ms silence before any audio.
2. A pulse preceding each audio track.
3. The initial audio track is usually a location based pre-slide show. Welcome, etc.
   This is usually made of multiple slides. Pulses must be placed in appropriate locations to follow the audio.
4. A Pulse must be placed after the final audio track, followed by another pulse 5 seconds later as a backup to clear the projector is a problem occurred.

Atlab CD Specification

To be documented

42HZ low frequency saw tooth?

db? Length? Channel?

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