🧏 NOTES - HEARING ---------------------- Philips HearLink 9050 = Oticon Intent Hearing / Sound Speech-first processing: Noise reduction, aggressive compression, and directionality are great for conversation in noise. On music, they can flatten dynamics, smear transients (like drum hits), or dull reverberation. Dynamic range squeeze: Music swings from whisper-quiet to thunder-loud. If compression is too strong (or attack/release too fast), instruments pump and vocals lose nuance. Feedback cancellation artifacts: Feedback managers that continuously adapt can misinterpret sustained notes (violin, organ) as feedback and warble or detune the sound. About 15.5% of American adults 18 years and over, or 40 million people, have trouble hearing. 28 million Americans suffer from some level of hearing loss, accounting for about 10 percent of the U.S. population. https://pmc.ncbi.nlm.nih.gov/articles/PMC3665209/ https://hearingacademy.org/articles/music-with-hearing-aids/ Speech: The range of frequencies important for speech understanding is approximately 250-8,000 Hz, with most of the information for word intelligibility falling between 1,000-4,000 Hz. Music: Music's frequency spectrum can range from 50 Hz (a deep bass feeling) to 16,000 Hz (the "overtones" and resonances which contribute to the distinct sound of a cymbal or bell). Hertz (Hz) is the unit of frequency that measures the number of cycles or events per second. It is commonly used to describe sound waves, electromagnetic waves, and the clock speeds of electronic devices Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Sounds = pressure v time https://iowaprotocols.medicine.uiowa.edu/protocols/hearing-aid-ha-and-music-limitations-and-problem-solving-strategies ASL Meredith https://courses.aslmeredith.com/courses/enrolled/167279? Gallaudet University - Center for Continuing Studies http://www.gallaudet.edu/ccs.html DC Public Library http://dclibrary.org/services/lbph Deaf Again (book) - culture ASL, classifiers, fingerspelling, and gestures https://www.gallaudet.edu/asl-connect/ https://www.nytimes.com/interactive/2021/07/16/arts/kamala-harris-name-sign-language.html How to learn sign language: 9 apps and resources to teach yourself ASL https://mashable.com/article/how-to-sign/ Gallaudet U ASL Connect - Sign by Topics https://gallaudet.edu/asl-connect/topics/ First 100 Signs: American Sign Language (ASL) http://www.lifeprint.com/asl101/pages-layout/concepts.htm Washington D.C .Metropolitan Area ASLClasses http://www3.gallaudet.edu/Documents/Clerc/SignClasses-DCMetroArea.pdf facial expressions are a critical part of sign language Emergent ASL https://www.instagram.com/thefamilyvocab/ Most Annoying Questions for Deaf People https://www.youtube.com/watch?v=DuCx5N5VAZk https://en.wikipedia.org/wiki/Profanity_in_American_Sign_Language According to expert Trudy Suggs, the third most used language in the United States is now very likely American Sign Language.