Audio Delay Line
Designed by Chapman Associates and manufactured in the U.K. by K-Tech Limited.
General
Chapman Associates are now able to offer an Audio Delay Line capable of continuously delaying speech signals fed into it by a period of 44 seconds.
Applications
For the monitoring of radio, telephone or other speech signals where activity may occur unexpectedly. If an operator listens to the signals coming from the original source and going into the delay line, when sudden activity is noticed the delay will provide sufficient time to alert other people or start a tape recorder to record the signal which will emerge from the Audio Delay Line 44 seconds later, without missing any of the message.
Since audio signals pass through the Delay Unit continuously, any other signals that immediately preceded the message of interest will also be heard providing that monitoring has commenced within the 44 second delay period.
Technical Specifications
| Input impedance: | 600 ohm unbalanced (phono socket) |
| Output impedance: | 600 ohm unbalanced (phono socket) |
| Input signal levels: | 0dBm nominal (0.775v rms from a 600 ohm source) |
| Through gain: | 0dB +/-1dB |
| Auxiliary output (1): | Up to 250mW into a 8 - 32 ohm loudspeaker |
| Supply voltage: | 8 - 12 volts dc |
| Current drain: | 20mA constant with no loudspeaker connected, otherwise up to 250mA depending on audio output level |
| Audio delay: | 44 seconds |
| Frequency response: | Approx. 200Hz - 3.5kHz |
| Housing: | White, high-impact polystyrene case |
| Size: | 155mm x 105mm x 40mm |
