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chew [2019/01/18 01:45] – yair | chew [2019/01/18 22:02] – yair | ||
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+ | "Bone conduction is not a new discovery. \\ | ||
+ | Ludwig Van Beethoven overcame deafness by biting a metal rod attached to his piano to hear his work." [[https:// | ||
+ | </ | ||
+ | can we use bone conduction to pick up chewing sounds and can we process and categorize them into something | ||
- | < | + | === recording technique === |
- | Ludwig Van Beethoven overcame deafness by biting a metal rod attached to his piano to hear his work." [[https:// | + | |
+ | < | ||
+ | conducted through the bone. A specially designed 0.0005 in. thick stainless steel needle | ||
+ | mounted on a phonograph cartridge (Figure 1) was found to be most reliable for | ||
+ | picking up vibrations from bony surfaces while a subject chewed a standard portion | ||
+ | of a test food for 10 strokes. The signal was fed through an amplifier and recorded | ||
+ | on a in. magnetic tape in a tape recorder* run at a speed of 3¾ inch per sec. The sounds | ||
+ | were also monitored with earphones by the investigator. \\ | ||
+ | [...]\\ | ||
+ | Three bony areas (center of the forehead, mastoid process and lower border of the mandible towards its angle) were | ||
+ | chosen to establish, if possible, a single satisfactory and reliable landmark for picking | ||
+ | up chewing sounds. The pick-up needle was gently pushed through the skin to rest | ||
+ | on the bony surface at a point that was free of muscle attachment and had a relatively | ||
+ | thin tissue cover. This point was established by palpating the area while the subject | ||
+ | was asked to clench his teeth and relax. The pick-up device was held in place with a | ||
+ | rubber cuff. The sounds were recorded separately from each of the three sites while | ||
+ | the subject chewed a 3 g portion of peanuts. | ||
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+ | The experiments were conducted in a sound-proofed recording studio. Bone Conduction was recorded with a microphone Shadow 4001 (frequency band: | ||
+ | 80-15000 Hz) pressed firmly against the cheek of the subject, near the maxillar angle, on the eating side. Air-conduction was recorded with a microphone | ||
+ | AKG C414EB (frequency band: 20-20,000 Hz) held on the other side of the subject’s head. The diaphragm of the microphone was in front of the ear canal | ||
+ | opening at 8 cm. | ||
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+ | Participants were seated comfortably in a small sound-attenuated booth [...] A microphone (Sennheiser ME66/K6 supercardioid, | ||
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+ | {{: | ||
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+ | </ | ||
- | can we use bone conduction to pick up chewing sounds and can we process and categorize them into something | ||
===articles=== | ===articles=== | ||
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- | [[https:// | ||
- | {{ :pasted:20190117-161122.png?300}} | + | *{{ ::kapur1971.pdf |" |
+ | *{{ :: | ||
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+ | [[https:// | ||
===hardware=== | ===hardware=== | ||
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currently a homebrew pickup\piezo pickup microphone seems the best bet. | currently a homebrew pickup\piezo pickup microphone seems the best bet. |