MyTek Stereo96 ADC Скачать руководство пользователя страница 16 | Manualshive

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“Optimal Noise Shaping and Dither of Digital Signals”

Preprint Number: 2822 Convention: 87 1989-10
Author: Michael Gerzon
Author: Peter G. Craven

This paper discusses optimizing noise shaping, with or without dither, using
filtered error-feedback round a quantizer.

“Psychoacoustically Optimal Noise Shaping”

Preprint Number: 2965 Convention: 89 1990-09
AES Journal Vol:Issue: 40:7/8 Page: 611 Year: 1992
Author: Robert A. Wannamaker

This paper examines the design of psycho-acoustically optimal noise shaping
filters for requantization in non-oversampling digital audio applications.

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Содержание Stereo96 ADC

Страница 1: ...MASTERING ANALOG TO DIGITAL CONVERTER USER MANUAL VER 7 sep 2010 Use ver 5 manual for earlier units without toslink ...

Страница 2: ...on at http www mytekdigital com For technical support technical tips and support check Http www mytekdigital com or contact Mytek tech support at highend mytekdigital com or at tel 646 613 1822 fax 212 202 5331 Mytek 211 Centre Street New York NY 10013 USA ...

Страница 3: ...setup Balanced Signal Source 6 Operation Analog input alignment 8 Operation Unbalanced Signal Source 9 Sampling frequencies and External synchronization 11 SuperShaper HR Noise shaping and dithering 13 Rack mount shelf 16 Companion Stereo96 DAC 17 Specifications 18 Warranty conditions 19 ...

Страница 4: ... a superior house clock to clock or synchronize other digital equipment Running Stereo96ADC on internal clock and slaving the rest of equipment to Mytek clock is the recommended setting for best sonic performance WCK IO can also be set to 256 superclock format used in older Protools systems Superclock wck is selected using Optical Toslink output can output both SPDIF and ADAT formats SPDIF format ...

Страница 5: ...k converters are closest to a straight wire which is especially evident when used at full 24 96 resolution Sonically they are equal or better than the most expensive mastering converters Even when used in 16 bit mode the Stereo96 converters produce 20dB 10 times less distortion than typical converters found in budget recording equipment On the Mytek website you can find and download various sound ...

Страница 6: ...he l st de ina ion in a chain y e w d u a l a e t F fed b xternal or clock so rce nd the cab e is long bov 6f or o s o u k w ri e a t 7 sh rt cable and w rdclock so rces with un no n d v c pabili y Jp o n t e o sh uld be left unconnected unterminated retai h jumper on ne pin H W DIPSWITC S 4 i sw1 R D D D 2 d p W DCK IVI E BY S 2 ND S 4 ON WCK F 2 FOR 88 96K A F FOR 4 48K A AYS S OFF WCK LW F i sw...

Страница 7: ...y equipment there is no sonic benefit in clocking Mytek ADC externally In case of such operational need refer to Sampling frequencies and external synchronization Setup for typical balanced operation includes following steps 1 Setup all other connections 2 Select desired clock source sync either internal or external If external wordclock or superclock source is required for systemic reasons setup ...

Страница 8: ...duction algorithm see Supershaper HR 5 Synchronize the destination either to digital input sync or to wordclock sync depending on system configuration The quality of recorded signal does not depend on how the digital destination is synchronized with Mytek AD converter 6 Record adjust input level with knob or by adjusting level at the source Unless you are printing final CD master we do not recomme...

Страница 9: ... fixed at 15dB which is a typical optimal level 1 Set the oscillator in your console at 1kHz and 0 VU Send the oscillator to the ADC analog input 0 VU at 4dB corresponds to 1 225 Volts RMS measured between pin 2 and 3 of the output XLRs If you do not have an analog oscillator you can use a calibrated analog out of a DA converter and generate the sinewave inside the DAW 2 Connect a digital PEAK met...

Страница 10: ...d when the wordclock source is capable handling such termination Do not terminate if the source is not capable of high current drive or cable is short 4 Select sampling frequency If wordclock superclock is used the sampling frequency has to correspond to external clock frequency can be multiple see Internal jumpers 5 Select output wordlength 24 bit full output is recommended 16 and 20 bit output a...

Страница 11: ...nput level by adjusting level at the source Unless you are printing final CD master we do not recommend recording too hot There is no sonic benefit of pushing the level up to 0dBFS A healthy 1 2 3 dBs headroom allows more freedom in later processing and mixing of recorded tracks The red peak light is triggered digitally when 1 or more samples are overload It s not recommended to peak frequently al...

Страница 12: ...k jitter before it reaches the actual AD circuit Stereo96ADC can be operated with any of 4 standard sampling frequencies or at any frequency between 30k 100k when supplied with external clock source The measurable audio band performance Dynamic Range stays virtually the same within all these frequencies 44 1k will be typically used for printing final master 48k is recommended for digital video pro...

Страница 13: ... results for 88 2 44 1 but don t work for 96k 88 2k is also easier to upsample to DSD 96k sample rate has in our opinion a marginally better perceived sound quality than 88 2k but the difference is very small and difficult to perceive for most people If the record is going to be mixed in analog domain 96k might be a desirable choice for tracking 12 ...

Страница 14: ... most of 24 bit performance in 16 bit data output Noise shaper performance graphs at 16 bit output When noise shaping processing is on the quantization noise is removed from the audio band where the noise floor is kept as close as possible to the 24 bit level and moved to the 20 22 kHz range The noise shaping filters are automatically engaged at appropriate levels when 16 bit output marked Supersh...

Страница 15: ...ce of sampling rate and word size at various points in the recording mastering transmission and replay chain is discussed Dynamic Range Enhancement Using Noise Shaped Dither at 44 1 48 and 96 kHz Preprint Number 4236 Convention 100 1996 05 Author J R Stuart Author R J Wilson This paper presents an overview of the work done on noise shaping summarizing how noise shapers are designed implemented and...

Страница 16: ...ng with or without dither using filtered error feedback round a quantizer Psychoacoustically Optimal Noise Shaping Preprint Number 2965 Convention 89 1990 09 AES Journal Vol Issue 40 7 8 Page 611 Year 1992 Author Robert A Wannamaker This paper examines the design of psycho acoustically optimal noise shaping filters for requantization in non oversampling digital audio applications 15 ...

Страница 17: ... you do not cause any damage to your unit 1 Remove the rubber feet If the feet are left on then you run the risk of bending the chassis and or the circuit board 2 Use the supplied 1 4 440 threaded screw only Any longer and you can cause permanent damage to the circuit board If you want to leave the rubber feet on then you have to be extra careful to not overtighten the screw past the point of bend...

Страница 18: ... hi end Digital to Analog converter for recording and mastering applications The main feature of this converter is its outstanding sound quality which makes it suitable for the most demanding projects when preserving the original signal quality is required ...

Страница 19: ...oseconds Analog Inputs 4dBm balanced or unbalanced 10kOhm Digital outputs Hi speed 25 100kHz AES EBU and SPDIF Optical TOSLINK SPDIF ADAT External Sync Wordclock in and out or 256x Superclock Wordlock Out as house clock 15 LS TTL loads max Can be terminated Input Gain Fixed 15dBFS or format potentiometer or 10 turn precision trimpots adjustable Mains 100 115V 220 240V 50 60Hz switchable Dimensions...

Страница 20: ...se unauthorized modifications or accidents are not covered by this warranty No other warranty is expressed or implied Any faulty unit should be sent shipping prepaid to the manufacturer service center Prior to shipping the client should obtain from Mytek an RMA for warranty services Units sent without RMA will not be accepted Mytek extends affordable repair service for all units manufactured to da...

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