DNA1 de-noiser, de-clicker, ambience processor

//DNA1 de-noiser, de-clicker, ambience processor
DNA1 de-noiser, de-clicker, ambience processor 2017-04-22T06:46:15+00:00
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The Weiss DNA1 is an extremely versatile toolbox for restoration work. It handles broadband noise reduction as well as de-clicking and de-crackling. The K-Stereo Ambience Processor brings back life to the music in case it lost some during de-noising, or generates a pseudo stereo signal out of mono. Finally an M/S matrix allows to define the stereo width.

DNA1 – a milestone in the Gambit Series equipment developments at Weiss Engineering. Three state of the art algorithms are packed into the DNA1. The de-noising section has been developed in cooperation with the Pure Notes Company (UK), the de-crackling and de-clicking algorithms are the Weiss R&D lab’s design and finally the K-Stereo Ambience Processor we licensed from Mr. Bob Katz (USA). All functions can be used concurrently. The DNA1 can be switched to M/S mode which can be useful e.g. for de-noising the M channel only while applying less de-noising on the S channel to leave the ambience intact. Several music tracks for listening before/after the DNA1 are available for download at the bottom of this product page.

“Itʼs simply amazing. Itʼs the best de-noiser I ever heard. Itʼs the only one that does not destroy the tails of the reverbs, the only one that fixes the comb-filtering in the high frequencies.”

Chris Hatzistamou, Athens Mastering, Greece

Controls, display
There are a total of 15 knobs in order to almost have a “one knob per parameter” operation. The knobs are touch sensitive to switch the LCD to display the associated parameters. The LCD shows an FFT of the input signal and meters to indicate the amount of de-noising going on. In addition all parameters are shown in numerical format.

Snapshots, MIDI, metering
Other basic features are an A/B compare memory, a 128 position snapshot bank with two additional banks for back-up (can also be dumped/recovered via MIDI), over indicators, MIDI control for each parameter, an overall bypass switch and an overall gain control, a channel ganging switch and an M/S mode switch.

Signal processing, connectivity
The internal processing is done in a 40 Bit floating-point format. Input signals can be between 44.1 and 96 kHz. The output can be POW-R dithered to 16, 20 or 24 Bits. The digital input/output are in AES/EBU format on XLR connectors.

Broadband de-noiser
The broadband de-noiser section works based on an FFT approach with a selectable number of frequency bands. The energy in each band is analyzed and thus determines whether the band is of relevance for the music signal. The de-noiser does not need to take a noise fingerprint, it continually adapts to the noise signature. Three operating modes can be selected, the automatic mode for uncritical de-noising, i.e. for cases where the noise floor is fairly low already and thus the de-noising is not that intrusive. The semi-auto mode where some of the de-noiser’s parameters are estimated first based on the auto-mode and subsequently are refined manually by the user. And finally the fully manual mode where all parameters are accessible, for those cases which require more subtle tuning to get the best result. Like e.g. cases of old recordings with high levels of noise which need a subtle balance between removed noise and noise required to stay such that the “vintage” touch of the recording is kept alive.

De-clicker, de-crackler
The de-clicker section is made up of nine main parameters. There are three groups of three parameters each. Each group, named “quality”, “sensitivity” and “click type”, has a few individually selectable snapshots which allow to zoom in on a particular de-clicking problem at hand. After setting the three snapshots for the three groups, the parameters can be trimmed further individually. With that scheme it is relatively simple to get a result quickly.

K-Stereo
The K-Stereo processor uses one main parameter, the K-level, which defines the level of the effect. In addition there is a three band equalizer with low cut, high cut and a parametric center band in peaking mode. The equalizer shapes the audio going through the K-Stereo process. The “wide” and “deep” on/off switches allow for additional shaping of the effect.

Output M/S Matrix
The output section consists of an additional M/S encoding/decoding matrix for final stereo width shaping. In addition left and right channels can be trimmed individually plus finally the volume of the stereo signal can be changed with a single knob.

Power
Mains voltage: 115 V or 230 V with voltage selector
Fuse rating: 500 mA slow blow
Power consumption: 40 VA max.

Size
Depth: 30 cm
Width: 43,3 cm (19″)
Height: 8,8 cm (2HU)

AES/EBU Input
Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
Maximum input word-length: 24 Bits
Channel Status Data: Input accepts professional or consumer format.
Channel Status Data Bits forwarded to AES/EBU output: see table below
Connector: XLR female

AES/EBU Output
Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz (always the same as the input)
Output word-length: 24 Bits
Connector: XLR male

AES/EBU Channel Status Data
The DNA1 allows to convert the incoming Channel Status Data as follows:
From Consumer to Professional
From Professional to Consumer
Transparent mode, i.e. Channel Status Data is fed forward to the output without any conversion (one exception, see below)

The following tables describe how the output Channel Status Data Bits are generated in the various conversion modes.

Output selected: Consumer format, Input: Consumer format:
All Bits fed forward (transparent), except for Byte 1:
Bits 0…6: 0000000 (category code general)
Bit 7: 1 (original)

Output selected: Consumer format, Input: Professional format:
Byte 0:
Bit 0: 0 (consumer)
Bit 1: 0 (audio)
Bit 2: 1 (copy allowed)
Bits 3, 4: Pre-emphasis according to input
Bit 5: 0 (two channel mode)
Bits 6, 7: 00 (Mode 0)

Byte 1:
Bits 0…6: 0000000 (category code general)
Bit 7: 1 (original)

Byte 2:
Bits 0, 1, 2, 3: Sampling frequency according to input
Bits 4, 5: 00 (accuracy grade II)
Bits 6, 7: 00

Bytes 3…23: Reserved bytes

Output selected: Professional format, Input: Professional format:
All Bits fed forward (transparent), except for Byte 2:
Bits 0, 1, 2: 001 (max. sample length = 24 Bit)
Bits 3, 4, 5: 101 (24 Bit word-length)
Bits 6, 7: 00

Output selected: Professional format, Input: Consumer format:
Byte 0:
Bit 0: 1 (professional)
Bit 1: 0 (audio)
Bits 2, 3, 4: Pre-emphasis according to input
Bit 5: 0 (source fs locked)
Bits 6, 7: Sampling frequency according to input

Byte 1:
Bits 0, 1, 2, 3: 0001 (two channel mode)
Bits 4, 5, 6, 7: 0000 (no user Bit encoding)

Byte 2:
Bits 0, 1, 2: 001 (max. sample length = 24 Bit)
Bits 3, 4, 5: 101 (24 Bit word-length)
Bits 6, 7: 00

Bytes 3…12: All Bits 0
Byte 23: CRCC byte

Output selected: Transparent, Input: Any format:
All Bits fed forward (transparent), except if EQ not bypassed for Byte 2:
Bits 0, 1, 2: 001 (max. sample length = 24 Bit)
Bits 3, 4, 5: 101 (24 Bit word-length)
Bits 6, 7: 00

Overload
Number of consecutive over-samples to cause “over” display: 1…16 selectable

Parameter Tables
Denoiser SNR improvement (dB):
0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, 20.0, 20.5, 21.0, 21.5, 22.0, 22.5, 23.0, 23.5, 24.0, 24.5, 25.0, 25.5, 26.0, 26.5, 27.0, 27.5, 28.0, 28.5, 29.0, 29.5, 30.0, 30.5, 31.0, 31.5, 32.0, 32.5, 33.0, 33.5, 34.0, 34.5, 35.0, 35.5, 36.0, 36.5, 37.0, 37.5, 38.0, 38.5, 39.0, 39.5, 40.0, 40.5, 41.0, 41.5, 42.0, 42.5, 43.0, 43.5, 44.0, 44.5, 45.0, 45.5, 46.0, 46.5, 47.0, 47.5, 48.0, 48.5, 49.0, 49.5, 50.0, 50.5, 51.0, 51.5, 52.0, 52.5, 53.0, 53.5, 54.0, 54.5, 55.0, 55.5, 56.0, 56.5, 57.0, 57.5, 58.0, 58.5, 59.0, 59.5, 60.0, 60.5, 61.0, 61.5, 62.0, 62.5, 63.0

Denoiser Intensity (%):
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100

Denoiser ambiance level (dB):
0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, 20.0, 20.5, 21.0, 21.5, 22.0, 22.5, 23.0, 23.5, 24.0, 24.5, 25.0, 25.5, 26.0, 26.5, 27.0, 27.5, 28.0, 28.5, 29.0, 29.5, 30.0, 30.5, 31.0, 31.5, 32.0, 32.5, 33.0, 33.5, 34.0, 34.5, 35.0, 35.5, 36.0, 36.5, 37.0, 37.5, 38.0, 38.5, 39.0, 39.5, 40.0, 40.5, 41.0, 41.5, 42.0, 42.5, 43.0, 43.5, 44.0, 44.5, 45.0, 45.5, 46.0, 46.5, 47.0, 47.5, 48.0, 48.5, 49.0, 49.5, 50.0, 50.5, 51.0, 51.5, 52.0, 52.5, 53.0, 53.5, 54.0, 54.5, 55.0, 55.5, 56.0, 56.5, 57.0, 57.5, 58.0, 58.5, 59.0, 59.5, 60.0, 60.5, 61.0, 61.5, 62.0, 62.5, 63.0

Denoiser frequency resolution (number of frequency points):
128, 256, 512, 1024, 2048

Denoiser crossover frequencies (Hz):
100, 257, 413, 570, 727, 883, 1040, 1197, 1354, 1510, 1667, 1824, 1980, 2137, 2294, 2450, 2607, 2764, 2920, 3077, 3234, 3391, 3547, 3704, 3861, 4017, 4174, 4331, 4487, 4644, 4801, 4957, 5114, 5271, 5428, 5584, 5741, 5898, 6054, 6211, 6368, 6524, 6681, 6838, 6994, 7151, 7308, 7465, 7621, 7778, 7935, 8091, 8248, 8405, 8561, 8718, 8875, 9031, 9188, 9345, 9502, 9658, 9815, 9972, 10128, 10285, 10442, 10598, 10755, 10912, 11069, 11225, 11382, 11539, 11695, 11852, 12009, 12165, 12322, 12479, 12635, 12792, 12949, 13106, 13262, 13419, 13576, 13732, 13889, 14046, 14202, 14359, 14516, 14672, 14829, 14986, 15143, 15299, 15456, 15613, 15769, 15926, 16083, 16239, 16396, 16553, 16709, 16866, 17023, 17180, 17336, 17493, 17650, 17806, 17963, 18120, 18276, 18433, 18590, 18746, 18903, 19060, 19217, 19373, 19530, 19687, 19843, 20000

Denoiser attack time (frames):
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57

Denoiser release time constants and AVERAGE (frames):
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127

Declicker SMOOTH:
on/off

Declicker LATENCY (s):
0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.20, 1.40, 1.60, 1.80, 2.00, 2.20, 2.40, 2.60, 2.80, 3.00

Declicker DETECTION THRESHOLD:
3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.2, 4.4, 4.6, 4.8, 5.0, 5.2, 5.4, 5.6, 5.8, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0, 30.0, 32.0, 34.0, 36.0, 38.0, 40.0, 45.0, 50.0, 55.0, 60.0, 70.0, 80.0, 90.0, 100.0, inf

Declicker EXTENSION THRESHOLD:
0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0

Declicker DISCARD THRESHOLD:
0.00, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00

Declicker CLICK LENGTH (samples):
50, 100, 200, 300

Declicker ADAPTIVITY:
0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0

Declicker ASYMMETRY:
0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0

K-level (dB):
−17.0, −16.5, −16.0, −15.5, −15.0, −14.5, −14.0, −13.5, −13.0, −12.5, −12.0, −11.5, −11.0, −10.5, −10.0, −9.5, −9.0, −8.5, −8.0, −7.5, −7.0, −6.5, −6.0, −5.5, −5.0, −4.5, −4.0, −3.5, −3.0, −2.5, −2.0, −1.5, −1.0, −0.5, 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0

K-Stereo Ambiance Filters Frequencies (Hz):
20 , 25, 31.5, 40, 50, 63, 80, 100, 126, 159, 200, 250, 315, 400, 500, 630, 800, 1000, 1260, 1590, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12600, 15900, 20000

K-Stereo Ambiance Filters Boost (dB):
−12.0, −11.5, −11.0, −10.5, −10.0, −9.5, −9.0, −8.5, −8.0, −7.5, −7.0, −6.5, −6.0, −5.5, −5.0, −4.5, −4.0, −3.5, −3.0, − 2.5, −2.0, −1.5, −1.0, −0.5, 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0

K-Stereo Ambiance Q:
0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0

Gains M-level, S-level, ch1 trim, ch2 trim, output gain (dB):
−∞, −92.0, −89.0, −86.0, −83.0, −80.0, −77.0, −74.0, −71.0, −68.0, −65.0, −62.0, −59.0, −56.0, −53.0, −50.0, −48.0, − 46.0, −44.0, −42.0, −40.0, −39.0, −38.0, −37.0, −36.0, −35.0, −34.0, −33.0, −32.0, −30.0, −29.5, −29.0, −28.5, − 28.0, −27.5, −27.0, −26.5, −26.0, −25.5, −25.0, −24.5, −24.0, −23.5, −23.0, −22.5, −22.0, −21.5, −21.0, −20.5, − 20.0, −19.5, −19.0, −18.5, −18.0, −17.5, −17.0, −16.5, −16.0, −15.5, −15.0, −14.5, −14.0, −13.5, −13.0, −12.5, − 12.0, −11.5, −11.0, −10.5, −10.0, −9.5, −9.0, −8.5, −8.0, −7.5, −7.0, −6.5, −6.0, −5.8, −5.6, −5.4, −5.2, −5.0, −4.8, − 4.6, −4.4, −4.2, −4.0, −3.8, −3.6, −3.4, −3.2, −3.0, −2.8, −2.6, −2.4, −2.2, −2.0, −1.8, −1.6, −1.4, −1.2, −1.0, −0.8, −0.6, −0.4, −0.2, 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0

Declicker Presets Preset 1 Preset 2 Preset 3 Preset 4
Small Clicks Medium Clicks Large Clicks Scratches
DETECTION THRESHOLD 16 20 24 40
EXTENSION THRESHOLD 3.2 3 2.4 1.5
ASYMMETRY 0.2 0.4 0.6 0.9
ADAPTIVITY 0.7 0.5 0.4 0.1
DISCARD THRESHOLD 0.05 0.05 0.1 0.3
MAXIMUM CLICK LENGTH 50 100 100 300

The DNA1 is useful for all kinds of restoration work. Like broadband de-noising, including subtle de-noising for almost perfect tracks as well as more severe de-noising for old recordings or for speech intelligibility enhancement. Or for de-clicking and de-crackling of old records or of recordings with “digital” clicks on them.

The K-Stereo section is useful to re-gain some ambience in de-noised music and also for converting mono signals to pseudo stereo.

The M/S mode can be useful e.g. for de-noising the mid signal only and leaving the side signal alone in order not to touch the reverberation too much.