Communications: electrical – Tactual indication
Patent
1996-09-04
1998-10-27
Swarthout, Brent A.
Communications: electrical
Tactual indication
3403111, 34082546, 310316, H04B 336, H04Q 130
Patent
active
058282955
ABSTRACT:
A mode tracking transducer driver (100) for a non-linear electromagnetic transducer (102) includes a voltage controlled oscillator (104) coupled within a phase lock loop to a transducer driver (106) and a mode detector (112, 108). The voltage controlled oscillator (104) generates a variable frequency output signal, and is responsive to a frequency control signal for controlling the frequency of the output signal. The transducer driver (106) generates a transducer drive signal (502) which is coupled to the non-linear electromagnetic transducer (102) to generate a tactile alert. The mode detector (112, 108) detects a mode change between at least the first operating mode and the second operating mode of the non-linear electromagnetic transducer (102), and in response thereto generates the frequency control signal (118) which establishes a quasi-resonant frequency (204) at which the tactile energy delivered by the non-linear electromagnetic transducer (102) is maximized.
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McKee John M.
Mittel James Gregory
Weber Darrell Curtis
Macnak Philip P.
Motorola Inc.
Swarthout Brent A.
Trieu Van T.
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