Audiolock II upgrade for Viewlock II allows up to two audio channels to be encrypted together with the video. With no size increase over the standard video only unit, Audiolock II is highly compact and offers complete protection for video and audio surveillance links.
AudioLock Application Diagram
With the Audiolock II upgrade, the video is connected in the normal way to the Viewlock II, however, audio is presented to the encoder rather than the transmitter. The Audiolock encoder then combines the audio within the scrambled video feed ready for secure transmission. At the receive site, the decoder extracts the audio to provide a clear output. Audiolock is configurable for one channel of 14 kHz bandwidth or two channels of 7 kHz bandwidth.
Connection to AudioLock
|Scrambling method||Digital audio data sent over video|
|Audio input /output level (nominal)||0 dBU i.e. 2.2 V peak to peak (unbalanced)|
|Max audio input / output level||+5 dBU (approximately 4 V peak to peak)|
|Audio input impedance||> 10kR|
|Audio output impedance||< 100R|
|Number of audio channels||1 or 2 (DIP switch select)|
|Audio bandwidth (mono)||30 Hz to 14 kHz (+1, -3 dB)|
|Audio bandwidth (stereo)||30 Hz to 7 kHz (+1, -3 dB)|
|Signal to noise (wrt 0 dBU input)||>60 dB (weighted)|
|Distortion @ 0 dBU , 1 kHz||< 1%|
|Video data lines used||Lines 5-16 / 318-329|
|Audio Compression||Equivalent to 16 bit audio via adaptive differential pulse code modulation (ADPCM) giving 4 to 1 compression.|
Due to continual product development Ovation Systems reserve the right to change specifications without notice. E&OE.