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Aeta Scoopy plus S Manual

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SCOOPY+ S - User Manual
111
7.1.4. Audio performance
The audio performance in this part applies to the system without coding/decoding. The additional effect
of the audio encoding and decoding on audio performance depends on the coding algorithm used and
its parameters.
Except when differently stated, the following measurements are done at a +6 dBu input level and on the
AD/DA path, with maximum input and output level set at +16 dBu.
Amplitude-frequency response
All measurements are done with a +6 dBu input signal, and a reference frequency of 1020 Hz. The
measurements are done with a loopback before coding/decoding, so the possible effect of compression
has no influence.
For a 48 kHz sampling rate:
Frequency range
Tolerance
0 Hz
20 Hz
-
0 dB
20 Hz
40 Hz
-0.2 dB
0.1 dB
40 Hz
20 000 Hz
-0.1 dB
0.1 dB
Group delay distortion
Taking the minimum group delay as reference, the group delay distortion on the AD/DA path is always
less than 1 ms.
Idle channel noise
Background noise is measured with no audio modulation (idle channel), with maximum input and
output level set at +16 dBu, through the whole encoder-decoder chain (wide band coding, with 48 or
32 kHz coding frequency).
Maximum noise level1: - 56 dBm (quasi-peak detection, CCIR weighting)
(or - 62 dBq0ps)
This result in a signal to noise ratio (SNR) of more than 72 dB.
When the maximum input and output level is set at another level, both the signal and noise levels are
shifted but the SNR remains in the same range.
Total distortion vs frequency and level
Total distortion relative to maximum level (or THD + N) is less than –78 dB over the whole audio
bandwidth (20 – 20 000 Hz). This performance holds for audio signals from –80 dB to –1 dB relative to
the maximum level (+16 dBu).
Crosstalk
Crosstalk is less than -80 dB over the whole bandwidth.
Gain and phase difference between channels
The gain difference between channels is less than 0.3 dB over the whole bandwidth, for any sampling
frequency.
The phase difference between channels is less than 3 degrees over the whole bandwidth, for any
sampling frequency.
1 Worst case for all types of algorithms; MPEG algorithms performs better than the others
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