Latest news about our activities and products - Spring 2017 IBC 2018 Convention, Amsterdam Jon Paul will attend the International Broadcast Convention in Amsterdam 13 to 15 September, 2018. Please let us know if you would like to arrange a brief visit. This is an opportunity to discuss Digital Audio transformer applications, Technical Papers and our latest new products. SBE/NAB/Ennes invited paper: The Origins of Our Digital Universe Jon has presented a historical perspective on early voice synthesis and speech scrambling, at the NAB/SBE Ennes Technical session Saturday April 22, 2017. We explored the history of the technology, inventors and advances that led directly to our modern digital media. During 1940 to 1942, Bell Telephone Laboratories developed the top-secret speech scrambler SIGSALY. In six months, Dudley, Shannon, Nyquist and others, made eleven fundamental inventions we all use today, including PCM, flash A/D converters and spread spectrum. SIGSALY is the foundation of all our audio and video codecs. We discussed Claude Shannon and SIGSALY, and connections to Hedy Lamarr and Alan Turing. The presentation included rare photos, exclusive SIGSALY speech clips, vintage music, and WWII poster art. SMPTE 2014 Papers Jon gave two papers at the Society of Motion Picture & Television Engineers 2014 Annual Technical Conference and Exhibition in Hollywood. Please see: https://www.smpte.org/smpte2014. Both papers were very well attended and received, with many questions and comments. AES Standards Revisions and SMPTE technical papers In the past years, Jon Paul has been researching digital audio transmission at sample rates 96 and 192 kHz over relatively long cables. Jon is on the Audio Engineering Society Standards Committee, Working Group 02-02, for digital audio transmission. He is assigned to a review and recommend a revision and update of AES 3-4 and AES 2id, at the next AES Standards meetings at the AES convention in Paris June 2016. The proposed revisions will bring the sample rates, technical details, information document and reference designs up to date and clarify the application of the AES standard to practical engineering designs for Digital Audio Transmission. The SMPTE 2014 landmark paper was presented in Hollywood in 2014, "Digital Audio Transmission Impairment and Link Failure: Test Data, and Recommendations for Improved Industry Standards and Reference Designs" is one result. Conference website is here: https://www.edas.info/p17109#S1569493707 Digital Audio Transmission Impairment and Link Failure: Test Data, and Recommendations for Improved Industry Standards and Reference Designs. http://www.scientificonversion.com/SMPTECables9.pdf The Origins Of Audio and Video Compression: Some Pale Gleams From The Past; A Historical Perspective On Early Speech Synthesis and Scramblers. http://crypto-museum.org/SMPTEOrigins7.pdf SuperShielded™ Transformers Our SuperShielded™ SC947-02LF is receiving wide use in high end Studio, Broadcast and High End HiFi equipment. It is a highly optimized version of our SC937-02. The results of 5 years of R&D, these hand made parts boast substantially lower shielded capacitance, lower aberration, and even wider bandwidth than our standard models. The primary-secondary shielded capacitance is only 0.5 pF. Common mode rejection is 50 dB at 60 MHz. SuperShielded™ digital audio transformers are intended for critical applications in high resolution systems to 24 bits and 192 kHz, and for especially interference-prone environments such as broadcast, professional video and digital audio studio equipment. It provides 22..36 dB better CMRR vs any other digital audio transformers! It is optimized for either 75 or 110 Ohm interfaces AES3, AES/EBU, SP/DIF and AES3id. Dual-Zo™ Transformers Since their introduction in 2003, our Dual-Zo parts have been specified in applications where space is at a premium and both balanced and unbalanced connections are required. These two SMD parts interface to both balanced and unbalanced circuits by use of dual windings of different ratios. The SC939-06LF is a shielded 1.2 : 1.0 : 1.2 ratio dual secondary part for applications interfacing a 110-ohm primary to both 75 and 110-ohm secondaries.; SC939-06 is rated for sample rates from 32 kHz up to 192 kHz. Our SC939-07LF transformer is shielded and has a turn ratio of 1.0 : 1.0 : 1.2. It is designed to couple a 75-ohm primary to both 75-ohm and 110-ohm secondaries. The SC939-07LF is for use with all popular AES/EBU transmitters, receivers and transceivers, at sample rates from 32 kHz up to 192 kHz. SuperSplitter™ SC945-01LF for 2-port applications This part interfaces a 110 Ohm input to a pair of 110 Ohm outputs for interfacing one source to 2 loads. It provides the best performance in an AES/EBU splitter, with optimal bandwidth and low pulse aberration for sample rates 32 kHz to 192 kHz. SC945-01LF has 1.4:1:1 ratio. Extremely wide bandwidth, low aberration, and high cross-port rejection characterize this unique device. New Laboratory Capabilities Since 2007, we have upgraded the network analyzer and jitter measurement capabilities in our test laboratory. Recently, we acquired many Tektronix and HP/Agilent instruments, including spectrum analyzers, bridges, generators and scopes. We can now measure and generate up to 1 GHz. We added special HP 75 Ohm Transmission/Reflection (directional coupler) sets and test fixtures for measuring the frequency response and return loss parameters of transformers with our HP 4195a Network/Spectrum analyzer. We now have an HP5372a Frequency and Time Interval Analyzer with 15 pS jitter capability, for use with our Induced Interference Jitter Histogram technique outlined in the AES 2001 paper. In 2008 we acquired a fine Yokogawa DL7440 500 MHz, 4 channel digital scope with high resolution jitter measurement capability. These instruments provide further improvements in our test data and our future transformer optimization. SC Transformers Rated to 192 kHz Our SMD transformers SC979-03LF, SC982-04LF, SC961-04LF, SC939-06LF, SC939-07LF, SC945-01LF and SC947-02LF are all rated for sample rates up to 192 kHz. The remaining SMD parts, SC937-02LF and; SC983-05LF are useable at 192 kHz but are optimized up to 96 kHz. Copyright © 2016 Scientific Conversion, Inc. All rights reserved. Information subject to change without notice. THE BEST TRANSFORMERS IN THE INDUSTRY! February 8 2017