Lavry 3000S Manuale utente

Model 3000S 96kHz

Digital Optimizer

Operations Manual

Lavry Engineering, Inc.

P.O. Box 4602

Rolling Bay, Washington U A

98061

http: //www.lavryengineering.com/

E-Mail: [email protected]

Revision 1.4

ovember 10, 2008

Operations Manual LE3000S

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 nited States in the event of a defect in materials or

workmanship.

Lavry Engineering may exchange new or rebuilt parts for defective parts. Please call the factory for an RMA

number prior to shipment. No product will be accepted for warranty service without a pre-issued RMA number.

This warranty is extended only to an original purchaser of the product from Lavry Engineering, or an authorized

reseller of Lavry Engineering. Products that are purchased from unauthorized resellers do not have any warranty

coverage. A valid purchase receipt or other valid proof of purchase will be required before warranty service is

provided. This warranty only covers failures due to defects in materials or workmanship and does not cover

damages which occur in shipment or failures resulting from accident, misuse, line power surges, mishandling,

maintenance, alterations and modifications of the product, or service by an unauthorized service center or

personnel. Lavry Engineering reserves the right to deny warranty service to products that have been used in

rental, service bureau, or similar businesses.

This limited warranty gives you specific legal rights. You may have others which vary from state/jurisdiction to

state/jurisdiction.

LIMITS AND EXCLUSIONS

LAVRY ENGINEERING DOES NOT, BY VIRT E OF THIS AGREEMENT, OR BY ANY CO RSE OF

PERFORMANCE, CO RSE OF DEALING, OR SAGE OF TRADE, MAKE ANY OTHER WARRANTIES,

EXPRESS OR IMPLIED, INCL DING, WITHO T LIMITATION, ANY WARRANTY OF MERCHANTABILITY,

FITNESS FOR A PARTIC LAR P RPOSE, TITLE OR NONINFRINGEMENT, AND ALL S CH WARRANTIES

ARE HEREBY EXPRESSLY DISCLAIMED. LAVRY ENGINEERING EXPRESSLY DISCLAIMS ANY IMPLIED

INDEMNITIES. LAVRY ENGINEERING SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL,

CONSEQ ENTIAL, P NITIVE, SPECIAL OR EXEMPLARY LOSSES OR DAMAGES, INCL DING, WITHO T

LIMITATION, DAMAGES TO RECORDINGS, TAPES OR DISKS, DAMAGES FOR LOSS OF B SINESS

PROFITS, B SINESS INTERR PTION, LOSS OF B SINESS INFORMATION, LOSS OF GOODWILL, COVER,

OR OTHER PEC NIARY LOSS, ARISING O T OF OR RELATING TO THE SE OF THE PROD CT, OR

ARISING FROM BREACH OF WARRANTY OR CONTRACT, NEGLIGENCE, OR ANY OTHER LEGAL THEORY,

EVEN IF LAVRY ENGINEERING HAS BEEN ADVISED OF THE POSSIBILITY OF S CH LOSSES OR

DAMAGES. ANY DAMAGES THAT LAVRY ENGINEERING IS REQ IRED TO PAY FOR ANY P RPOSE

WHATSOEVER SHALL NOT EXCEED THE ORIGINAL COST PAID TO LAVRY ENGINEERING FOR THE

APPLICABLE PROD CT. BECA SE SOME STATES/J RISDICTIONS DO NOT ALLOW THE EXCL SION OR

LIMITATION OF LIABILITY FOR CONSEQ ENTIAL OR INCIDENTAL DAMAGES, THE FOREGOING

LIMITATION MAY NOT APPLY TO YO .

Lavry Engineering ® is a registered trademark of Lavry Engineering, Inc.

Acoustic Bit Correction™ is a registered Trademark of Lavry Engineering, Inc.

email: techsupport@lavryengineering.com

Internet: http://lavryengineering.com/

Operations Manual LE3000S

Table of Contents

Limited Warranty ............................................................................................ 1

PART I

Introduction ............................................................................................... 3

Main Screen ................................................................................................... 4

24 High Frequency Sample Rate Conversion ................................................ 5

24 Bit Encode and Decode............................................................................. 5

2:1 Synchronous Downsampling .................................................................... 5

Input Selection Screen ................................................................................... 6

Word Length / Copy Protection / Generation Screen ..................................... 6

Audio Control Screen ..................................................................................... 7

Bar-Graph, Emphasis, and Display Screen.................................................... 7

Options Screen............................................................................................... 8

Acoustic Bit Correction Screen....................................................................... 8

Store Preset Screen ....................................................................................... 9

Signal Analysis Screen................................................................................... 10

Test Tone Screen........................................................................................... 11

Delay Screen.................................................................................................. 11

PART II

Tutorial ...................................................................................................... 12

Connections ................................................................................................... 12

Starting p ..................................................................................................... 12

Input Selection................................................................................................ 12

Monitoring Input Data ..................................................................................... 12

Bar-Graph....................................................................................................... 13

Output Format and Sample Rate Conversion ................................................ 13

Options Screens............................................................................................. 14

Power- p Preset ............................................................................................ 14

Test Tones ..................................................................................................... 14

sing the Tone Generator and THD+N Features........................................... 15

PART III

Specifications............................................................................................ 16

Appendix I

Acoustic Bit Correction™ .......................................................................... 19

Noise-Shaping Curves .............................................................................. 23

Appendix II

Testing Of Asynchronous Sample Rate Converters.................................. 24

Appendix III

Signal Analysis of THD+N......................................................................... 26

Operations Manual LE3000S

PART I: Introduction

Operation of the Model 3000S Digital Optimizer requires the use of five push button switches located on

the front panel. The two-line liquid crystal display is organized for quick and intuitive operator interface.

The unit features eleven screen displays.

Push Button Switches:

ENTER Introduces and moves the cursor through screen positions that can be edited by the operator.

CURSOR Push buttons allow the user to choose a screen and to select the cursor

UP/DOWN position. The P/DOWN buttons are also utilized when changing digits of a selected entry.

GO Executes an edited screen.

EXIT Removes the cursor and allows selection of other screens with the P/DOWN buttons.

Pressing EXIT again will cause the unit to go to the main screen.

Scroll Through Screens:

If the screen cursor is present, you need to remove it by pressing EXIT. When the screen cursor is not

present, the UP and DOWN buttons serve to move from screen to screen.

Edit Screens

Press ENTER to introduce the screen cursor at the first editable location. Each additional pressing of

ENTER will move the screen cursor to the next editable location. The settings at an editable location may

be changed by the use of the P/DOWN buttons.

Holding the UP or DOWN button will automatically advance the settings. This feature is particularly useful

for increasing or decreasing numbers (such as test tone frequency, preset number, word length and

amplitude).

The GO button is used to execute an action. Seven screens react to a change of settings immediately,

and pressing GO is not necessary. Three screens require the operator to press GO for execution (this

allows the operator to edit more than one setting before execution). Details are found in the following

sections.

The following pages are organized to match the display screens. Some illustration screens may contain

more lines of information than the display itself normally does. They are intended as a quick guide to

possible settings.

Operations Manual LE3000S

Main Screen

IN:PRO 44 44100 50/15uS

OUT:CON 44 BYPASS MODE

The top line consists of:

IN Indicates input signal information

PRO or CON (professional or consumer format)

44 or 48 (input frequency indication embedded in the input format)

44100 input frequency measurement to 1 Hz

CCITT or 50/15uS, NO-EMPH or NOT-INDicated emphasis indication

The bottom line consists of:

OUT Indicates output signal information

PRO or CON (professional or consumer format)

44 or 48 (output frequency indication embedded in the output format)

BYPASS output operating mode. Possible output frequency or sync modes:

• BYPA MODE

STRAIGHT-THRO GH MODE, O TP T FQ = INP T FQ 40-100K

• 44.1k BYPA

JITTER ATTEN ATION MODE, O TP T FQ = INP T FQ 44.1K +-100 PPM

• 48.0k BYPA

JITTER ATTEN ATION MODE, O TP T FQ = INP T FQ 48.0K +-100 PPM

• 44.1 kHz XTAL

INTERNAL CRYSTAL CONTROLS O TP T FREQ., SAMPLE-RATE-CONVERSION

• 48.0 kHz XTAL

INTERNAL CRYSTAL CONTROLS O TP T FREQ., SAMPLE-RATE-CONVERSION

• AE LOCK 44.1

44.1K +-100 PPM LOCKS O TP T FREQ ENCY TO SYNC INP T

• AE LOCK 48.0

48.0K +-100 PPM LOCKS O TP T FREQ ENCY TO SYNC INP T

• AE WIDE LOCK

40K-50K WIDE LOCKS O TP T FREQ ENCY TO SYNC INP T

• WC LOCK 44.1

44.1K +-100 PPM LOCKS O TP T FREQ ENCY TO SYNC WORD CLOCK INP T

• WC LOCK 48.0

48.0K +-100 PPM LOCKS O TP T FREQ ENCY TO SYNC WORD CLOCK INP T

• WC WIDE LOCK

40K-50K WIDE LOCKS O TP T FREQ ENCY TO SYNC WORD CLOCK INP T

• 88.2 kHz XTAL

INTERNAL CRYSTAL CONTROLS O TP T FREQ., SAMPLE-RATE-CONVERSION

• 96.0 kHz XTAL

INTERNAL CRYSTAL CONTROLS O TP T FREQ., SAMPLE-RATE-CONVERSION

• 24 Bit ENCODE

ENCODES 24 BIT DATA INTO TWO HIGH-SPEED 16 BIT WORDS

• 24 Bit DECODE

Operations Manual LE3000S

DECODES 24 BIT DATA FROM TWO HIGH-SPEED 16 BIT WORDS

• 2:1 DOWN AMPL

SYNCHRONO S DOWNSAMPLING FROM 88-96K TO 44-48K

24 High Frequency Sample Rate Conversion

IN:PRO 44 44100 50/15uS

OUT:CON 44 96.0 kHz XTAL

p/Down Sample Rate Conversion between high-speed modes (88.2 kHz and 96 kHz sample rates) and

low speed modes (44.1 kHz and 48 kHz sample rates) is accomplished by the Model 3000S. The input is

automatically sensed by the 3000S, and is displayed on the top line. The output frequency is selected by

the mode select procedure above.

DC Removal, Boost/Cut, and Delay functions are disabled in high-speed output modes. Conversion

between 96 kHz and 88.2 kHz is not possible.

24 Bit Encode and Decode

IN:PRO 44 44100 50/15uS

OUT:CON 44 4 BIT ENCODE

The 24 BIT ENCODE mode is used for encoding a 48 kHz or 44.1 kHz 24 bit stereo signal into a 96 kHz

or 88.2 kHz 16 bit stereo signal. The 24 BIT DECODE mode is used to reconstruct the original 24 bit

stereo signal. Both modes operate at a synchronous 2:1 or 1:2 data rate; the original bits are not modified

in any way.

This mode allows high-sample rate 16 bit recorders, such as those made by Pioneer, to be used for wide-

word recording at conventional sample rates.

2:1 Synchronous Downsampling

IN:PRO 44 44100 50/15uS

OUT:CON 44 :1 DOWNSAMPL

A 2:1 synchronous downsampling mode has been provided. This mode has superior THD and dynamic

range for down sampling from the AD122-96. (-125 dB THD+N).

The mode is invoked by selecting 2 1 DOWNSAMPL on the main screen for the output mode.

If the input signal is switched from high sampling (88-96kHz) to low sampling (44.1-48kHz) the 3000S will,

in this mode, pass the signal through 1:1 (similar to BYPASS). This allows quick selection of sample-rate

for listening comparisons.

All dither modes and delay are active in this mode; DC Removal and Boost-Cut are not available.

Operations Manual LE3000S

Input Selection Screen

SELECT INPUT:

AES/EBU INPUT SELECTED

SELECT INPUT:

SPDIF INPUT SELECTED

This screen is used for selecting one of the two available inputs located at the rear panel: the XLR

connector (for AES/EB ) or the RCA connector (for S/PDIF). Input Rate switching is automatic for low

range of 40-50 kHz or high range of 88-96 kHz input sample rates.

Word Length / Copy Protection / Generation Screen

In professional mode, this screen shows the indicated input word length, and allows the user to change

the output coding word length indication, and for truncation (Truncation can be done with or without dither

as will be shown later):

INPUT WORD LENGTH = 4

OUTPUT WORD LENGTH = 16

NOTE: reduced word length can be used for rounding. For example, 20 bits input can be rounded to 16 bits

by setting the output to 16 bits.

IN:CATEGORY=CD C=1 L=0

OUT:CATEGORY=DAT C=1 L=0

In consumer mode, this screen contains information regarding category, C bit and L bit settings (pertaining

to copy protection) and generation information.

Possible choices (X can be 0 or 1)

COPY PROHIBIT BIT C bit (C2)

Valid for all categories 0 = Copy prohibit

1 = Copy permitted

GENERATION BIT L bit (C15)

CD category only 0 = Original / commercially recorded data

1 = No indication / first generation or higher

DAT or PCM category 0 = No indication / first generation or higher

1 = Original / commercially recorded data

GEN category only 0 = No indication

1 = No indication

Mixed screens result from different modes for input and output:

IN:CATEGORY= CD C=1 L=0

OUTPUT WORD LENGTH = 16

Operations Manual LE3000S

Audio Control Screen

CUT/BOOST: ON - 0 DB

DC REMOVAL ON +POLARITY

Cut/Boost The signal level can be adjusted over a range of +60 dB to -60 dB in 1 dB steps. The function

can be turned on and off without changing the amplitude change value.

DC offset removal Removes any DC offset in the signal. DC removal should be activated prior to

processing of audio, to allow for some settling time (less then 3 seconds) and to avoid a "click" sound. The

algorithm continues to monitor and correct for slow varying offset variations.

Polarity +POLARITY corresponds to analog input signal connection with "pin 2 hot". -POLARITY

corresponds to analog input signal connection with "pin 3 hot"; -POLARITY inverts the phase of the signal

by 180˚.

Bar-Graph, Emphasis, and Display Screen

FINE:OFF 0 METER: -00 H

OUT: NO-EMPH DISPLAY:3

FINE: OFF 20 / BIT

This screen is used to select the BIT display mode and the FINE mode with its corresponding reference

point from -10 dB to -20 dB. In FINE mode, the reference LED will be lit, and the channel level will be

displayed in increments of 0.2 dB around that reference point. This is useful for setting precise levels.

Indications are OFF, ON, and BIT. The BIT mode displays the active bits in the output stream, with the

most significant bit displayed to the right (0 dB LED). This display shows active bits in the data.

METER: -00

(Meter Range)

Normal display showing peak and peak-hold indicates levels ranging from 0 to -55dB. While such a setting

is useful in normal day to day operation, extending the display to indicate lower level activity allows

monitoring low levels.

Meter Setting Display range Read Bar-Graph

METER: -00 0 dB to -55 dB

Read Bar-Graph panel indicator

METER: -30 -30 dB to -85 dB

Add -30 dB to panel indicator

METER: -60 -60 dB to -115 dB

Add -60 dB to panel indicator

METER: -90 -90 dB to -145 dB

Add -90 dB to panel indicator

H (or L)

LED bar-graph brightness may be adjusted.

DISPLAY: 3

Display contrast may be adjusted from 0 to 7.

Operations Manual LE3000S

Options Screen

CLIP= 1 OFF

CHAN STATUS LEFT

This screen allows the user to set or remove the following automatic features:

CHAN STAT S LEFT/RIGHT:

This selects whether the Channel Status bits are read from the left channel data (channel A default), or

from the right channel data (channel B). Normal operation is to read from left channel data (channel A).

CLIP:

When set to ON, the MAXIM M LED will turn on and stay on when output data hits full-scale value for 1 to

6 successive samples (user-settable). The appropriate 0 dB bar-graph lamp (left channel, right) will start

blinking. The MAXIM M and corresponding lamps may be reset by pressing any of the push button

switches. When CLIP is off, the MAXIM M light will flicker when a single full-scale sample is encountered.

Acoustic Bit Correction Screen

DITHER: OFF

NOISE-SHAPING: OFF

This screen allows the user to set or remove Dither and Noise Shaping. Based upon customer feedback

and further studies, V1.4 software offers High Pass or Flat Dither type and four noise-shaping curves. Our

research taught us two interesting facts:

a. Certain data compression schemes require the dither to have flat frequency response

characteristics.

b. Recording engineers’ preference of dither type (high pass or flat) and noise shaping curves often

depends on characteristics of the music involved.

Acoustic Bit Correction Mode Selection is as follows:

DITHER:

When set to DITHER ON, Model 3000S inserts truncation dither prior to the truncation operation. This

feature is recommended when reducing word length.

Options: OFF, HPDF (High Pass Distribution Function) or FLAT

NOISE-SHAPING:

Adds noise-shaping to optimize the noise-floor and the psychoacoustic effect of the dither. Four noise-

shaping curves are available.

Options: NS1-NS4

88.2 kHz and 96 kHz output modes allow only HPDF dither and NS1 special noise-shaping curve

optimized for wide bandwidth.

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