User manual LAVRY 3000S REV 1.4

[. . . ] Model 3000S 96kHz Digital Optimizer Operations Manual Lavry Engineering, Inc. Box 4602 Rolling Bay, Washington USA 98061 http: //www. lavryengineering. com/ E-Mail: techsupport@lavryengineering. com Revision 1. 4 November 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 United States in the event of a defect in materials or workmanship. Lavry Engineering may exchange new or rebuilt parts for defective parts. No product will be accepted for warranty service without a pre-issued RMA number. [. . . ] 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). A peak condition will turn the MAX LED on and start the 0 dB LED blinking (for the corresponding channel). Pressing any button will turn these LEDs off until the next peak is detected. DITHER ON/OFF: Use of Acoustic Bit Correction, the built-in noise shaper plus dither is recommended for truncating from a longer word to a shorter one. READ LEFT/RIGHT CSBITS: When set to LEFT, the Model 3000S reads the digital audio information from the left channel (this is likely to cover most source material). The user may select the right channel. Power-Up Preset The Preset screen starts with "STORE RAM PRESET". You may store the present settings of the Model 3000S into the RAM preset (press GO) or exit the screen. Test Tones To generate a test tone, scroll to the test tone screen and set the frequency, amplitude and destination (left, right or both). To change the frequency or amplitude by large increments, hold down the CURSOR UP or CURSOR DOWN buttons. To stop the tone press EXIT twice (returning to the communications screen). The word length at the output is subject to truncation and dither settings. CNS word length is always 16 bits. 14 Tutorial LE3000S Using the Tone Generator and THD+N Features Model 3000S is an all digital machine, capable of supplying and analyzing AES/EBU and SPDIF digital audio data. While aimed at digital in/digital out applications, the use of external reference A/D and D/A converters can expand usability to include analog domain measurements (accuracy will be limited to the performance of such devices). Example A: evaluating a single digital in/digital out unit. 1. Set Model 3000S for appropriate output parameters: Highest tone accuracy is achieved when unit is set to output 24 bits (Professional format). Select test tone screen, set for desired tone frequency and amplitude, and press the "GO" button. You may now adjust "unit under test" parameters while viewing THD+N. You may go back and forth between tone generation screen and THD+N screen for testing different amplitudes at the set frequency. Selecting a new frequency requires you to press GO to re-tune the notch. Example B: optimizing multiple unit interconnections. Clearly, the microphone preamplifier resides at the front end, and the format converter at the back end. Some units may be placed in various locations in the audio chain (which is better?The old "trial and error" method may work well for two units in series. Evaluating each unit individually (see example A) and then connecting them in descending order of performance yields the best results (i. e. , best unit first, driving second best, with lowest performer last in the chain). 15 Specifications LE3000S PART III: Specifications Sample Rate Conversion Input Signal: Full scale (0 dB), 24 bits, no dither. Equipment used: Audio Precision, System One - Dual Domain D-D THD+N test set to 6 samples, 500 msec delay, tuning = frequency Output word length =24 bits INPUT OUTPUT 48 kHz 48 kHz : 48 kHz 44. 1 kHz : 44. 1 kHz 48 kHz : 44. 1 kHz 44. 1 kHz : Output word length =20 bits INPUT OUTPUT 48 kHz 48 kHz : 48 kHz 44. 1 kHz : 44. 1 kHz 48 kHz : 44. 1 kHz 44. 1 kHz : Output word length =18 bits INPUT OUTPUT 48 kHz 48 kHz : 48 kHz 44. 1 kHz : 44. 1 kHz 48 kHz : 44. 1 kHz 44. 1 kHz : Output word length =16 bits INPUT OUTPUT 48 kHz 48 kHz : 48 kHz 44. 1 kHz : 44. 1 kHz 48 kHz : 44. 1 kHz 44. 1 kHz : 1 kHz tone -110 dB (. 00032%) -105 dB (. 00056%) -104 dB (. 00063%) -111 dB (. 00028%) 10 kHz tone -121 dB (. 00009%) -112 dB (. 00025%) -109 dB (. 00035%) -121 dB (. 00009%) 18 kHz tone -123 dB (. 00007%) -106 dB (. 00050%) -103 dB (. 00071%) -121 dB (. 00009%) 1 kHz tone -110 dB (. 00032%) -105 dB (. 00056%) -104 dB (. 00063%) -111 dB (. 00028%) 10 kHz tone -118 dB (. 00013%) -112 dB (. 00025%) -109 dB (. 00035%) -118 dB (. 00013%) 18 kHz tone -119 dB (. 00011%) -106 dB (. 00050%) -103 dB (. 00071%) -118 dB (. 00013%) 1 kHz tone -107 dB (. 00045%) -104 dB (. 00063%) -102 dB (. 00079%) -106 dB (. 00050%) 10 kHz tone -110 dB (. 00032%) -108 dB (. 00040%) -107 dB (. 00045%) -110 dB (. 00032%) 18 kHz tone -110 dB (. 00032%) -105 dB (. 00056%) -102 dB (. 00079%) -119 dB (. 00035%) 1 kHz tone -98. 0 dB (. 00126%) -97. 5 dB (. 00133%) -97. 2 dB (. 00138%) -98. 1 dB (. 00124%) 10 kHz tone -98. 7 dB (. 00100%) -98. 6 dB (. 00117%) -98. 4 dB (. 00120%) -98. 8 dB (. 00115%) 18 kHz tone -99. 0 dB (. 00112%) -98. 1 dB (. 00124%) -96. 7 dB (. 00146%) -97. 8 dB (. 00129%) High Frequency Conversion Output word length =20 bits INPUT OUTPUT 1 kHz tone 10 kHz tone 48 kHz 96 kHz : -110 dB (. 00032%) -118 dB (. 00013%) 96 kHz 48 kHz : -111 dB (. 00028%) -112 dB (. 00025%) 44. 1 kHz 88. 2 kHz : -110 dB (. 00032%) -118 dB (. 00013%) 88. 2 kHz 44. 1 kHz : -111 dB (. 00028%) -112 dB (. 00025%) 18 kHz tone -119 dB (. 00011%) -112 dB (. 00025%) -119 dB (. 00011%) -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 lowfrequency conversion in two passes. 16 Specifications AUDIO PRECISION FFT AMP1(dBFS) vs FREQ(Hz) 0. 0 -12. 50 -25. 00 -37. 50 -50. 00 -62. 50 -75. 00 -87. 50 -100. 0 -112. 5 -125. 0 -137. 5 -150. 0 10. 00 01 NOV 93 12:42:09 AUDIO PRECISION FFT AMP1(dBFS) vs FREQ(Hz) 0. 0 -12. 50 -25. 00 -37. 50 -50. 00 -62. 50 -75. 00 -87. 50 -100. 0 -112. 5 -125. 0 -137. 5 -150. 0 10. 00 LE3000S 01 NOV 93 13:59:53 2. 01k 4. 01k 6. 01k 8. 01k 10. 0k 12. 0k 14. 0k 16. 0k 18. 0k 20. 0k 22. 0k 2. 01k 4. 01k 6. 01k 8. 01k 10. 0k 12. 0k 14. 0k 16. 0k 18. 0k 20. 0k 22. 0k 1 kHz tone 44. 1k to 44. 1k Conversion 0 dB, 16 bit word length AUDIO PRECISION FFT AMP1(dBFS) vs FREQ(Hz) -60. 00 -70. 00 -80. 00 -90. 00 -100. 0 -110. 0 -120. 0 -130. 0 -140. 0 -150. 0 -160. 0 -170. 0 -180. 0 -190. 0 -200. 0 20 100 1k 10k 20k 13 NOV 93 19:41:24 1 kHz tone, 44. 1k to 44. 1k Conversion 0 dB, 20 bit word length AUDIO PRECISION FFT AMP1(dBFS) vs FREQ(Hz) 0. 0 -10. 00 -20. 00 -30. 00 -40. 00 -50. 00 -60. 00 -70. 00 -80. 00 -90. 00 -100. 0 -110. 0 -120. 0 -130. 0 -140. 0 -150. 0 -160. 0 20 100 1k 10k 20k 13 NOV 93 18:00:38 Dynamic Range 1 kHz tone, 48k to 44. 1k Conversion -60 dB, 24 bit word length AUDIO PRECISION -90. 00 -95. 00 -100. 0 -105. 0 -110. 0 -115. 0 -120. 0 -125. 0 -130. 0 -135. 0 -140. 0 -120 F_LVL2(dBFS) vs GENAMP(dBFS) 14 NOV 93 17:00:45 High Frequency Full Scale Performance 18 kHz tone, 48k to 44. 1k Conversion 0 dB, 24 bit word length AUDIO PRECISION -90. 00 -95. 00 -100. 0 -105. 0 -110. 0 -115. 0 -120. 0 -125. 0 -130. 0 -135. 0 -140. 0 -120 F_LVL2(dBFS) vs GENAMP(dBFS) 14 NOV 93 16:53:40 -100 -80. 0 -60. 0 -40. 0 -20. 0 0. 0 -100 -80. 0 -60. 0 -40. 0 -20. 0 0. 0 THD+N vs. level- 44. 1k to 44. 1k Conversion 1 kHz and 19 kHz tones THD+N vs. level- 48k to 44. 1k Conversion 1 kHz and 19 kHz tones 17 Specifications LE3000S Test Tone Generator Output Signal: Full scale (0 dB), no dither. [. . . ] Reversing the order allows the first process to retain its high accuracy, leaving a compounded outcome of one 16 bit device. Measuring THD+N The common method for measuring THD+N is based on feeding a "device under test" with a quality reference test tone and measuring the undesirable energy (THD+N) at its output. Lavry Engineering's 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). [. . . ]