Table of Contents
Summary of Contents for Lavry 3000S
- Page 1 Model 3000S 96kHz Digital Optimizer Operations Manual Lavry Engineering, Inc. P.O. Box 4602 Rolling Bay, Washington USA 98061 http: //www.lavryengineering.com/ E-Mail: techsupport@lavryengineering.com Revision 1.4 November 10, 2008...
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Page 3: Limited Warranty
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. -
Page 4: Table Of Contents
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 ........ -
Page 5: Part I Introduction
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. -
Page 6: Main Screen
Operations Manual LE3000S Main Screen IN:PRO 44 44100 50/15uS OUT:CON 44 BYPASS MODE The top line consists of: Indicates input signal information or CON (professional or consumer format) 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:... -
Page 7: 24 High Frequency Sample Rate Conversion
Up/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. -
Page 8: Input Selection Screen
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/EBU) 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. -
Page 9: Audio Control Screen
Operations Manual LE3000S Audio Control Screen CUT/BOOST: ON -20 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. -
Page 10: Options Screen
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. -
Page 11: Store Preset Screen
The word DONE appears after pressing GO, when the storage into non-volatile RAM is completed. The factory default preset may be recalled by holding down the EXIT button while powering up the 3000S. The preset may then be modified and saved by following the procedure above. -
Page 12: Signal Analysis Screen
The third measurement is THD+N. The unit will update THD+N results about every 1.5 seconds, depending on input sample rate. AUTO mode enables the Model 3000S to lock to the incoming tone frequency. MANUAL mode sets the analysis frequency to the frequency programmed by the TEST TONE SCREEN. This allows the notch filter to be manually tuned by the user. -
Page 13: Test Tone Screen
In test tone mode, the Model 3000S checks the output frequency setting under the main screen. The test tone data rate will be locked to the input data frequency when output sample rate is set to BYPASS. The Model 3000S becomes a “stand alone”... -
Page 14: Part Ii Tutorial
PART II: Tutorial This tutorial is designed for the first time user of the Model 3000S. It requires that the default settings conform with the "factory default settings". To reset the unit to the factory default settings press and hold the push button labeled EXIT while powering up the unit. -
Page 15: Bar-Graph
Tutorial LE3000S the actual data rate measured by the internal counter of the Model 3000S. The last indication (on the right side of the top line) indicates the emphasis type coding. Bar-Graph View the BAR-GRAPH LEDs while your source is playing audio data. Observing the peak-hold action of the far right LED will help avoid clipping of the audio. -
Page 16: Options Screens
Control of the two OPTIONS screens is done in the same manner as previously stated (find the screen with the CURSOR buttons, ENTER to introduce and move a cursor, CURSOR UP/DOWN for setting selection and EXIT for removing a cursor). These screens allow the user to configure the Model 3000S operation as described below: CLIP AUTO-MAX ON/OFF: When set to ON, the BAR-GRAPH display serves to warn the user when the audio has reached a peak (maximum or minimum code value). -
Page 17: Using The Tone Generator And Thd+N Features
Example A: evaluating a single digital in/digital out unit. 1. Connect model 3000S output to unit under test. Select output sample rate on main screen. Connect unit's output to Model 3000S input. 2. Set Model 3000S for appropriate output parameters: Highest tone accuracy is achieved when unit is set to output 24 bits (Professional format). -
Page 18: Part Iii Specifications
-112 dB (.00025%) -112 dB (.00025%) Note: 96 kHz to 44.1 kHz sample-rate-conversion can be accomplished in one step by the 3000S. However, it is strongly recommended that, for best quality, a 2:1 conversion be combined with a low- frequency conversion in two passes. -
Page 19: Dynamic Range
Specifications LE3000S AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 01 NOV 93 13:59:53 AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 01 NOV 93 12:42:09 -12.50 -12.50 -25.00 -25.00 -37.50 -37.50 -50.00 -50.00 -62.50 -62.50 -75.00 -75.00 -87.50 -87.50 -100.0 -100.0 -112.5 -112.5 -125.0 -125.0 -137.5 -137.5 -150.0... -
Page 20: General Specifications
Specifications LE3000S Test Tone Generator Output Signal: Full scale (0 dB), no dither. Equipment used: Audio Precision, System One - Dual Domain D-D THD+N test set to 6 samples, 500 msec delay, tuning = frequency Word length/Freq. 1 Hz tone 10 Hz tone 18 Hz tone 24 bits / 44.1 Hz... -
Page 21: Acoustic Bit Correction
The Model 3000S offers High Pass or Flat Dither type and four noise-shaping curves. Model 3000S allows the user to use dither with or without noise shaping. Operating noise shapers without dither is undesirable so the unit automatically shuts the noise shaper off when dither is off. - Page 22 The practice of truncating to short word length (8-12 bits) should be avoided, although the Model 3000S performs this admirably. The ideal noise-shaping curve may be irritating at loud levels. (Model 3000S's 8 bit noise shaping curves are based on a different curve).
- Page 23 Appendix I LE3000S AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 14 NOV 93 12:54:19 AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 14 NOV 93 12:45:07 AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 14 NOV 93 12:47:26 -100.0 -100.0 -100.0 -105.0 -105.0 -105.0 -110.0 -110.0 -110.0 -115.0 -115.0 -115.0 -120.0...
- Page 24 Appendix I LE3000S AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 14 NOV 93 13:59:14 AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 14 NOV 93 14:00:12 -80.00 -80.00 -85.00 -85.00 -90.00 -90.00 -95.00 -95.00 -100.0 -100.0 -105.0 -105.0 -110.0 -110.0 -115.0 -115.0 -120.0 -120.0 -125.0 -125.0 -130.0 -130.0...
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Page 25: Noise-Shaping Curves
Appendix I LE3000S Noise-Shaping Curves Figure 11 compares Flat dither with AUDIO PRECISION FFT AMP1(dBFS) FREQ(Hz) 26 JUN 94 14:42:15 -80.00 NS2, NS3, and NS4 noise-shaping -85.00 curves. Note the increasing -90.00 aggressiveness of the curves, with the -95.00 -100.0 pronounced dip at 4kHz and in the -105.0 12kHz region. -
Page 26: Appendix
Appendix II LE3000S Appendix II: Testing Of Asynchronous Sample Rate Converters The theoretically ideal sample rate converter is a device that converts the data transfer rate without changing the content of the material. Listening tests: Many devices are judged by their particular sonic quality. A recording engineer may prefer, for example, a small amount of distortion to add some "color"... - Page 27 Real world limitations of reference DAC performance set limits to such measurements (DAC performance is typically lower at high amplitudes and frequencies). Model 3000S utilizes a high Q (steep resonance) LC circuit for de-jittering incoming data. Further jitter reduction may be achieved with a 1:1 sample rate conversion, using a low jitter crystal clock oscillator for the output data clock.
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Page 28: Appendix Iii Signal Analysis Of Thd+N
122 dB provide sufficient margin for the next generation of digital audio equipment. The Model 3000S’s test tone generation and Signal analysis are independent of each other. This flexibility allows performing either function separately or both simultaneously. - Page 29 Model 3000S provides the user with a reference test tone. The processed tone (or any other source) may be fed back to Model 3000S input. The input signal is filtered by a very sharp notch to separate the desired signal component from the undesirable energy (THD+N). The undesirable energy (THD+N) is then...
- Page 30 Additional 20 Hz high pass filtering ensures that very low frequency components (such as DC and other low frequency inaudible energy) does not alter the outcome. Model 3000S begins its measurement by locking to the test tone frequency. There are 2 modes (user selectable) for achieving lock: •...
- Page 31 AES/EBU or SPDIF device. Use of a quality reference D/A converter allows for listening for various effects (distortions, channel separation, room and speaker cabinet vibrations and more). The output of device(s) or setup under test may be applied back to Model 3000S inputs for the following reasons: •...
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