There was no interference when both normal speech frequency and the carrier frequency operated over the same pair of copper wires.
2.
Bush has a mild high-frequency hearing loss likely due to flying jets, the doctor said, and his hearing tests excellent in the speech frequencies.
3.
Clark s research demonstrated that an electrode bundle with'graded stiffness'would pass without injury around the tightening spiral of the cochlea to the speech frequency region.
4.
This technology uses an advanced microchip within the device that captures audio signals, while amplifying the human speech frequency above that of the background noise on the television.
5.
The audiogram associated with sensory presbycusis is thought to show a sharply sloping high-frequency loss extending beyond the speech frequency range, and clinical evaluation reveals a slow, symmetric, and bilateral progression of hearing loss.
6.
However, most of the published results of success fall within the speech frequency of 500 Hz, 1000 Hz and 2000 Hz; poorer results are typically obtained in the high frequencies, but these are normally less hampered by otosclerosis in the first place.
7.
One application is spectral inversion, typically of speech; a carrier frequency is chosen to be above the highest speech frequencies ( which are low-pass filtered at, say, 3 kHz, for a carrier of perhaps 3.3 kHz ), and the sum frequencies from the modulator are removed by more low-pass filtering.
8.
Additionally, different speech sounds make use of different parts of the speech frequency spectrum, so a continuous background noise such as white or pink noise will have a different effect on intelligibility than a variable or modulated background noise such as competing speech, multi-talker or " cocktail party " babble, or industrial machinery.
9.
After successfully completing the surgery in 1978, with his post-doctoral colleague, Yit Chow Tong, Clark discovered how multi-channel Hz is required for speech understanding, so Clark emphasised early in the development of the cochlear implant that " place coding through multi-channel stimulation " would have to be used for the important mid-to-high speech frequencies.
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