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040 7448 329657 (04.97) PC-SW 4.5
C H A P T E R 1 : S Y S T E M D E S C R I P T I O N
Audio codec
The TITAN videocodec’s audio codec encodes and decodes the audio data st-
ream in accordance with the following standards:
Audio interfaces
The following audio interfaces are provided by the TITAN videocodec:
– 2 microphone inputs with digital mixer
– Line input and output
– Recorder interface for recording and playback
– Interface for an external telephone hybrid – Aux
– Connection for an active loudspeaker
– integrated echo cancellation
The transmitted and received sound is mixed and provided at the recorder in-
terface as one signal for recording. For playback, the signal from the recorder
is mixed into both the receive and the transmit circuits of the TITAN videoco-
dec.
The same procedure is used for the external telephone hybrid. Here, however,
an echo canceller has been integrated which cancels echo occurring in the
telephone line.
Echo cancellation
After all audio detectors (microphones) and loudspeakers have been installed
and the levels set, the TITAN videocodec can be used to measure the feed-
back and then calibrate the echo cancellation of the system set up. This
should be done before every video transmission.
Video inputs
The sockets for the video inputs of the TITAN videocodec can be assigned to
various signal types. There are four video input modes available for this pur-
pose. These are shown in TABLE 1.3.
TABLE 1.2
BANDWIDTHS AND DATA RATES OF THE AUDIO CODING STANDARDS
Standard
Bandwidth
Data rate
ITU-T G.711 a-Law
300 Hz to 3400 Hz
64 kbit/s
ITU-T G.711
µ
-Law
300 Hz to 3400 Hz
64 kbit/s
ITU-T G.722 mode 2
50 Hz to 7000 Hz
56 kbit/s
ITU-T G.722 mode 3
50 Hz to 7000 Hz
48 kbit/s
ITU-T G.728
a
a
For the new interface unit (ID no. 229503) and from SW version 4.0 onwards
300 Hz to 3400 Hz
16 kbit/s
Philips “GSM”
b
b
Not for the new interface unit (ID no. 229503) with SW version 4.0.
300 Hz to 3400 Hz
16 kbit/s
TABLE 1.3
POSSIBLE INPUT SIGNALS FOR THE VIDEO INPUT MODE
CVBS 1
CVBS 2
CVBS 3
CVBS 4
CVBS 5
CVBS 6
Y/C
RGB+S
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Summary of Contents for Titan
Page 1: ...TITAN Videocodec ISDN Videocodec Operator Manual ...
Page 2: ...T I T A N V I D E O C O D E C I S D N V I D E O C O D E C O P E R A T O R M A N U A L ...
Page 7: ...040 7448 329657 04 97 PC SW 4 5 ...
Page 147: ...8 153 040 7448 329657 04 97 PC SW 4 5 C H A P T E R 8 F A C T O R Y S E T T I N G S ...
