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Lavry AD122-96 Mark III Operation Manual

Manual is about: 96kHz Mastering Quality Analog to Digital Converter

Summary of AD122-96 Mark III

  • Page 1

    Model ad122-96 mark iii 96khz mastering quality analog to digital converter operations manual lavry engineering, inc. 945 hildebrand lane ne suite 110 bainbridge island, wa 98110 (206) 842-3552 http://www.Lavryengineering.Com/ email: techsupport@lavryengineering.Com revision 1.2 march 2005.

  • Page 2

    Operations manual ad122-96 mkiii mkiii preface the mkiii is our 4 th generation gold series analog to digital converter. The first gold ad, model ad122 (developed under our old company name – db technologies) was the first converter to reach 122db dynamic range which is 20 bits of true performance. ...

  • Page 3

    Ad122-96 mkiii operations manual limited warranty subject to the conditions set forth below, for one year after the original purchase date of the product, lavry engineering will repair the product free of charge in the united states in the event of a defect in materials or workmanship. Lavry enginee...

  • Page 4

    Operations manual ad122-96 mkiii table of contents limited warranty ................................................................................. ..2 part i introduction...........................................................................................4 operating instructions ..............

  • Page 5

    Ad122-96 mkiii operations manual 4 part i: introduction the model ad122-96 mkiii mastering quality analog to digital converter receives analog input signals at the left and right analog input channels. The converter can receive balanced or unbalanced analog input signals. Individual left and right a...

  • Page 6

    Operations manual ad122-96 mkiii 5 operating instructions operation of the model ad122-96 mkiii mastering quality analog to digital converter requires the use of five push button switches located on the front panel. The liquid crystal display is organized for a quick and intuitive operator interface...

  • Page 7

    Ad122-96 mkiii operations manual 6 main screen the main screen is used for selecting the a to d clock source and output word length parameters. The top line controls the a to d clock source: 44.1khz internal crystal 20 bits wl abc: flat nsoff when setting for internal clock operation, choose sample ...

  • Page 8

    Operations manual ad122-96 mkiii 7 word length and acoustic bit correction the bottom line controls word length and acoustic bit correction™ parameters: 44.1khz internal crystal 20 bit wl abc: hpdf ns2 setting word length: the selection of word length (16 to 24 bits) sets the digital output word len...

  • Page 9

    Ad122-96 mkiii operations manual 8 audio control screen high resolution mode dc removal: off +polarity the user may activate the soft saturation feature by altering the top line to soft saturation mode. When activated, the audio signal is amplified by two (6db boost), and signal peaks are compressed...

  • Page 10

    Operations manual ad122-96 mkiii 9 bar-graph & display screen fine: off 20 meter: -00 0 peak/hold off display:4 bar-graph settings: fine: off sets the bar graph display (led's) for normal audio monitoring. Setting to fine: on 20 activates the reference meter bridge function, for fine-tuning of signa...

  • Page 11

    Ad122-96 mkiii operations manual 10 any of the front panel switches. When peak/hold is off , the max lamp will flicker when a single full-scale sample is encountered. Display contrast: the lcd display may be adjusted from 0 to 7. Warm-up and calibration the recommended warm up time is 15 minutes. Th...

  • Page 12

    Operations manual ad122-96 mkiii 11 hardware interconnections analog inputs are applied to the xlr connectors marked as left analog input and right analog input. The input signals can be balanced or unbalanced. The converter power line signal rejection is very high (120db common mode rejection) but ...

  • Page 13

    Ad122-96 mkiii operations manual 12 part ii: specifications analog inputs: the analog signal can be amplified by 0-12db utilizing the front panel screw adjust trim pots. Full- scale signal with 0db gain is 24dbu, (full-scale signal with 12db gain is 12dbu). Input impedance over 0-100 khz: greater th...

  • Page 14

    Operations manual ad122-96 mkiii appendix i: acoustic bit correction™ high quality digital audio sound often incorporates long words (many bits). Both high-resolution a/d converters (22 bits or more) and signal processing equipment (digital mixers, equalizers, reverb and more) generate longer words ...

  • Page 15

    Ad122-96 mkiii operations manual additional publications by m. Gerzon, p. G. Craven, j. R. Stuart and j. R. Wilson (all from the united kingdom) and j. Goodwin (from the u.S.A.) shed light on this complex subject. Dithered noise shaping technology has been incorporated into a handful of hardware dev...

  • Page 16

    Operations manual ad122-96 mkiii figure 6 shows the effect of high-pass triangular dither only. The more coherent data in the dithered bits, the better the dithering process works. Note that dithering from 24 bits to 22 bits has a lower noise floor but more visible distortion components than ditheri...

  • Page 17

    Ad122-96 mkiii operations manual noise-shaping curves 20.00 2.02k 4.02k 6.01k 8.01k 10.0k 12.0k 14.0k 16.0k 18.0k 20.0k freq(hz) -160.0 -155.0 -150.0 -145.0 -140.0 -135.0 -130.0 -125.0 -120.0 -115.0 -110.0 -105.0 -100.0 -95.00 -90.00 -85.00 -80.00 amp1(dbfs) audio precision fft vs 26 jun 94 14:42:15...

  • Page 18

    Operations manual ad122-96 mkiii 17 appendix ii: ad122-96 mkiii input considerations achieving 20 or more bits of resolution places a heavy demand on the linearity and noise of analog signals prior to the a/d conversion. Linearity: linearity problems (typically associated with larger signals) should...

  • Page 19

    Ad122-96 mkiii operations manual 18 note: much information is available regarding proper shielding. The well known book "grounding and shielding in instrumentation" by ralph morrison provides an excellent explanation of the subject and points out clearly that the floating shield connection is the co...

  • Page 20

    Operations manual ad122-96 mkiii appendix iii: ad122-96 mkiii soft saturation the soft saturation feature provides a digital emulation of an ideal magnetic tape saturation characteristic. The three available settings are: 1. Soft saturation off: yields normal converter operation (see lower curve vof...

  • Page 21

    Ad122-96 mkiii operations manual below are time domain plots for the +3db setting (left plot) and +6db setting (right plot). Each plot shows the transformation of two input signals (dotted lines) to two output signals (solid lines). The settings provide different tradeoffs between gain and "peak sig...

  • Page 22

    Operations manual ad122-96 mkiii appendix iv: viewing noise floor on ad122-96 mkiii display the simplest form of random noise is "white noise". White noise is bounded between two limits. The probability of occurrence for any amplitude value between the two limits (boundaries) is equal; thus, it is a...

  • Page 23

    Ad122-96 mkiii operations manual such measurement and calculation may aid in evaluating the noise of a driver device, or a series of devices. The distribution due to addition of gaussian signals is still gaussian. While the 8db "translation factor" is true for gaussian noise, it does not hold true f...