The Digital
Adaptive Telephone Hybrid (DATH) provides a major
advance in telecom to studio interfaces employing the latest digital
signal processing techniques to give an adjustment-free
connection between the audio mixer and telephone lines from the
"on the spot" reporters and contributors to
"phone-in" programmes.
Isolating
studio audio from the received speech during broadcast
"phone-ins" has long presented difficulties for the
studio engineer. Although analogue solutions exist, advances in
silicon technology now permit an economic design using digital
techniques.
Using
industry standard DSP circuits, significant improvements have
been made in side tone rejection and delayed echo cancellation
compared with the performance of conventional analogue devices.
In the
Digital Adaptive Telephone Hybrid (DATH) advanced Digital Signal
Processing is used to implement a 256 tap adaptive Finite Impulse
Response (FIR) Filter. This, together with an electronic hybrid
having an optimised fixed balance impedance, splits the
bi-directional telephone line signals into separate send and
receive paths. Sidetone, the inherent leakage from the send to
receive path, is minimised as the adaptive filter coefficients
converge to values appropriate to the particular telephone
connection.
To meet the
requirements of users the product can be interfaced with straight
digital hybrids where interfaces to the users are handled by
existing or specialised control panels, alternatively Audix
Broadcast can supply modular based panels or sub assemblies where
full remote control of the digital hybrid is possible. The
interfaces show telephone line and hybrid status, interfaces and
interlocks with telephone handsets as well as studio interfaces.
Dath brochure - download 1.8mb
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