https://www.signalessence.com/blog daily 0.75 2022-10-07 https://www.signalessence.com/blog/stm-32h743-fir-filter-performance-y06Lf monthly 0.5 2022-09-26 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824718657-KC5NCNME5QIRMKB7D6YC/cycles.png Blog - STM 32H743 FIR Filter performance - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.signalessence.com/blog/disable-pulse-audio-please monthly 0.5 2022-09-26 https://www.signalessence.com/blog/comb-filtering monthly 0.5 2022-09-26 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824718560-WF17L0071578A67S1RG1/comb.png Blog - Comb Filtering https://www.signalessence.com/blog/can-you-use-an-iphones-internal-microphone-for-acoustic-testing-and-accurate-recordings monthly 0.5 2022-09-26 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/99eee184-9601-458c-8e23-177f00107747/iPhone-6S-compression.png Blog - Can You Use an iPhone's Internal Microphone for Acoustic Testing and Accurate Recordings? - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/66c969b3-d13b-4f74-827b-3345b62c3c2f/iphone-frequency-response.png Blog - Can You Use an iPhone's Internal Microphone for Acoustic Testing and Accurate Recordings? - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1f701140-20ee-48ad-ae47-35309bc6db28/audiotools.png Blog - Can You Use an iPhone's Internal Microphone for Acoustic Testing and Accurate Recordings? - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.signalessence.com/blog/how-to-quickly-reliably-and-easily-compare-altium-symbol-pinout-with-a-parts-datasheet-pinout monthly 0.5 2022-09-26 https://www.signalessence.com/blog/how-to-run-audio-through-linux-with-about-3-milliseconds-latency-end-to-end-using-real-time-linux monthly 0.5 2022-09-26 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1682c5c5-c595-4bfe-9cc7-a7e86b0026b7/realtime-610x370.png Blog - How to run audio through linux with about 3 milliseconds latency end-to-end using real time linux - Make it stand out htop https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/6ae8c656-59e5-41b3-a594-0090c03f8d33/setlog-610x508.png Blog - How to run audio through linux with about 3 milliseconds latency end-to-end using real time linux - Make it stand out Log_File https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1fc63df0-c58b-4003-9dc7-efa61bb93f82/qsetings-610x504.png Blog - How to run audio through linux with about 3 milliseconds latency end-to-end using real time linux - Make it stand out Setup https://www.signalessence.com/blog/recompiling-a-minimal-kernel-that-works monthly 0.5 2022-09-26 https://www.signalessence.com/blog/lets-learn-a-bit-about-measurement-microphones monthly 0.5 2022-09-26 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824714495-0HQAMFKS2YA4YSG6XL51/measurement-microphones.png Blog - Let's learn a bit about measurement microphones! - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.signalessence.com/blog/whats-inside-the-jbl-305p-mkii-lame-teardown-quick-repair monthly 0.5 2022-09-26 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141720760-09SA6AOFW50VEI8MMM7O/IMG_5760.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141720610-579UV9RDGEEOM2WEJGN4/IMG_5766.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141755508-OAGALQO5F43FZBWSVLTW/IMG_5775.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141721377-VGAXDDKTNYKNQ7BH3OJ4/lack.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141755572-M54PTV3YDZJYZEA42RA7/IMG_5776.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824710698-FZDC9H50DJT54M8LHG5T/IMG_5773.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141241204-I65N4OA3PD92TUWFJ11U/IMG_5769.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141282322-KEJHOKDXDIDLG8TMYGQO/IMG_5768.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141308865-581ZGV7BMZ31G2DJP5WJ/IMG_5771.jpg Blog - What's inside the JBL 305P MkII / 'teardown' / Quick Repair https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1664141336409-9WI0E5YMFP2YQM53JY3E/IMG_5772.jpg Blog - 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Use Jack Audio Connection Kit to monitor your microphones - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824717294-KL1P8JM2OZGQNG6Y0Y79/qjackctl.png Blog - Use Jack Audio Connection Kit to monitor your microphones - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824714859-1003ZQL9FJ8WSM18L3Z5/qjack.jpg Blog - Use Jack Audio Connection Kit to monitor your microphones - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/95ae257c-3d35-427c-ad39-dd9fb742d9f7/qjackctl-setup-610x510.png Blog - Use Jack Audio Connection Kit to monitor your microphones - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1661824716895-Y8LI6D07UAJSAFYT1KZA/qjackctl-started.png Blog - Use Jack Audio Connection Kit to monitor your microphones - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://www.signalessence.com/blog/mems-microphone-teardown monthly 0.5 2022-09-19 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1663623292902-L6QIXTLBV9MBH1GLW3XD/20181204_0003-300x225.png Blog - MEMS Microphone Teardown - Make it stand out Here you can see the diaphragm and back plate. The back plate is a mesh material that is conducting and forms one side of the capacitor (condensor) microphone. The diaphragm is *just* below the grid and is the vibrating piece. Also, Look very closely at the dead center of each diaphragm. The actual diaphragm has a tiny hole drilled dead center, which serves as a low-frequency rolloff (high-pass filter). This helps with low frequency hvac noise and also with wind bluster. Not to mention atmospheric changes. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/219c2ab3-4209-4601-9d9f-1e8c163abd63/20181204_0006-300x225.png Blog - MEMS Microphone Teardown - Make it stand out This microphone was misplaced at the board house. They should have caught this and fixed it themselves. But.. it provides us an opportunity for teardown. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1663623293044-ZO6RQAQQZMR3EQ1PK3ZO/20181204_0005-300x225.png Blog - MEMS Microphone Teardown - Make it stand out I popped off the diaphragm holder here, but they went flying and were not anywhere to be seen. But, here you see the bottom port itself. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/b14810e0-a54b-4885-9d6b-09ca72bbc8b5/20181204_0009-300x225.png Blog - MEMS Microphone Teardown - Make it stand out Here’s a closeup of the Infineon diaphragm. Again, it’s 2 layers, but the grid on the back plate isn’t immediately obvious. Perhaps it’s an extraordinarily fine mesh. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1663623292327-CYQ6DQJYWM4A0FLXHLH4/20181204_0002-300x225.png Blog - MEMS Microphone Teardown - Make it stand out Close up, it’s clearly visible that there are 2 major parts to this microphone: the microphone ‘capsule’ itself on the right, and the PDM modulation chip on the left. The microphone capsule is actually two capsules in parallel. My suspicion is that this does a couple things: first, it might fit a little better than one larger diaphragm, and also, it keeps the self-resonance of the each diaphragm high, while improving the sensitivity of the system. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/1663623292201-5388TSFA6K0YM42UYH2A/20181204_0001-300x225.png Blog - MEMS Microphone Teardown - Make it stand out This microphone itself is pretty small, 3.5 x 2.65 x 1.0mm https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/d09488f3-5b13-49b7-9ea4-18be2a69fe3e/20181204_0007-300x225.png Blog - MEMS Microphone Teardown - Make it stand out Well, the microphone came off the board more easily than the metal cap comes off the microphone. I wonder if I can disassemble this… https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/00428f9c-2e02-491b-8de8-82e11e35b278/20181204_0008-300x225.png Blog - MEMS Microphone Teardown - Make it stand out This one was much tougher to get into than the Knowles. Clearly, it has a very different design. A couple things are notable: First, there is only 1 large diaphragm as opposed to two. The other thing is that there are 4 wires going to the sensor, as opposed to only 2 in the Knowles. I’m not entirely sure why this is. Could be for bias. Could be for balanced signaling. 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Caleb Crome Tobias Keene, D.D.S. Hailing from Richmond, Virginia, Dr. Tobias Keene brings a bit of unabashed Southern hospitality to all his patients. He moved to Washington, D.C. over thirty years ago as a freshman at Ivy College. Right after graduation, he attended World University’s School of Dentistry. Before opening Keene Dental in 1994, he worked for free clinics and some of the finest practices in the District. He is part of the 123 Dental Association and stays up-to-date on the latest dental discoveries. When not striving to keep his patients happy and healthy, he’s enjoys hiking with his family in Rock Creek Park. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/d829df14-6554-4f51-913e-af122709dbfa/Hugh_profile_500.jpg Team - Hugh McLaughlin CEO / Founder Hugh earned his MSEE at Santa Clara University. He subsequently founded SignalWorks, a software firm that designed and developed full-duplex speakerphone (FDS) software modules. SignalWorks was sold to Cisco in 2003. Hugh is a leading authority on acoustic echo cancellation with over 30 years experience with DSP algorithms. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/c7723311-baec-4ca7-b392-309fde96e074/Paul_profile_500.jpg Team - Paul McLaughlin Manager of Operations Paul has extensive experience and a broad range of skills in IT, technical support, administration, and operations, including work experience at Micron Technology, Ogilvy & Mather, and Sony Music Entertainment. https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/041af360-740b-452b-902d-012b200a1335/Rob_profile_500.jpg Team - Rob Yu Rob Yu Rob earned his MSEE at Cornell University. He has extensive work experience in defense signal processing and is an expert in Audio DSP algorithms. https://www.signalessence.com/about-signal-essence daily 0.75 2022-07-01 https://images.squarespace-cdn.com/content/v1/628eb874276b4f2d3dc7bf49/70799465-5d90-4c8a-a289-c66342ecfd44/beam+pro+in+office.jpg About Signal Essence - Signal Essence — Your Audio Team with Expertise in Microphone Arrays, Acoustics, and Noise Reduction. Working with Signal Essence is like instantly acquiring a team of audio experts. We analyze our clients’ audio requirements and work with them to integrate microphone arrays and loudspeakers into their products. We provide a complete software audio solution including direction-finding, beamforming, acoustic echo cancellation and noise reduction. We view each design as a total system and not just a software delivery, preferring to get started early in the development process and work with your industrial design and mechanical engineers to ensure success. 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