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puts may be configured for FM, or for full-range digital
broadcast requirements or Internet streaming.
Optional “Diversity Delay” of the composite multiplex
and FM-mode line outputs synchronize the analog FM
signal with the digital program broadcast in the HD Ra-
dio™ System.
Internal RDS subcarrier combining includes built-in me-
tering to obviate the need for specialized monitoring
equipment.
Intuitive front-panel setup and full remote operation are
afforded over any IP network. Provided software runs
under Windows XP or later with easy PC backup of all
DAVID IV settings.
A built-in test-tone generator simplifies setup.
Low latency allows off-air monitoring.
The DAVID IV boots or resets
in less than one second
and
draws only 8 watts from the AC mains.
DAVID IV TECHNICAL SPECIFICATIONS
Some specifications of the DAVID IV are difficult to quantify in
tabular form. Page numbers in parentheses here and elsewhere
in the manual point to more-in-depth discussions.
GENERAL PERFORMANCE
PLEASE NOTE
:
1) The gain structure of an audio processing
system is determined in large part by how
the user sees fit to set numerous ‘subjective’
adjustments. In addition, various processing
functions intentionally upset the tonal bal-
ance (static and dynamic frequency response)
and the waveshape (‘native distortion’ inher-
ent in all program material). Thus it has be-
come customary to establish and publish
performance specifications with audio pro-
cessing features disabled or bypassed. Un-
less otherwise expressed or implied herein,
this is the case with figures shown here, as
indeed seems also the practice of our worthy
competitors.
2) Measurements taken from the Composite/
MPX outputs, or analog/digital line outputs
in the FM mode, presume use of an appropri-
ate de-emphasis network.
Frequency Response:
Composite/MPX Output:
±0.25dB, 20Hz–15kHz
L/R Analog Line Outputs:
±0.25dB, 20Hz–15kHz, FM mode;
±0.25dB, 20Hz–20kHz, Flat mode.
AES Digital Output (Digital Input):
±0.25dB, 20Hz–15kHz, FM mode;
±0.1dB, 20Hz–20kHz, Flat mode.
Noise
(unweighted r.m.s.)
:
Composite/MPX Output:
SNR >85dB referred to full carrier
modulation.
L/R Analog Line Outputs:
Residual noise better than 100dB below
the output clipping point.
AES Digital Output (Digital Input):
Residual noise better than 130dB below
0dBFS.
Distortion:
Composite/MPX Output:
<0.01% THD
Line Outputs (Digital or Analog):
<0.006% THD
Stereo Separation:
Composite/MPX Output:
>65dB, 20Hz–15kHz assuming the use
of a lab-quality FM-multiplex decoder.
>78dB Linear Crosstalk (main/sub or
sub/main).
L/R Analog Line Outputs:
>100dB at 1dB below the output clip-
ping level.
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