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公开(公告)号：CA2371097C
公开(公告)日：2008-06-17
申请号：CA2371097
申请日：2000-05-05
Applicant: QUALCOMM INC
Inventor： KERR RICHARD , VIJ GAJINDER , CLAXTON DANIEL D
Abstract: A detection circuit that detects the open and close state of a flip cover of a communications device. The detection circuit includes a resistive network and an analog-to-digital converter (ADC). When the flip cover is in the closed position, the circuit detects a unique resistive value through a set of contacts. This voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. When the flip cover is in the open position, the contacts are broken, thus, disabling the detection of the unique resistive value. The resulting voltage level is converted from an analog signal to a digital signal via the AD for input into a microprocessor. Software, programmed within the microprocessor, enables the communications device to operate in the appropriate mode according to the detection of the open/close state of the flip cover.
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公开(公告)号：DE3856045D1
公开(公告)日：1997-11-20
申请号：DE3856045
申请日：1988-12-21
Applicant: QUALCOMM INC
Inventor： WEAVER LINDSAY , KERR RICHARD
Abstract: A method and apparatus for converting phase data into amplitude data. Input phase data is divided into upper and lower phase increments using an input splitter which can also fold in quadrant data. One or more storage elements, such as sine and cosine ROMs, are connected to the input splitter and generate an amplitude, which forms one of a plurality of series terms, and first and second derivatives of the amplitude in response to the upper phase increment. The first derivative and lower phase increment are multiplied together in a digital multiplier to produce a second series term. A third series term comprising a product of the amplitude and lower phase increment squared, is generated by a term generator connected to the splitter and to the storage element. The term generator can comprise elements such as a ROM addressable by the lower phase increment and the amplitude. The first, second and third series terms are subsequently added together by one or more digital adders connected to the multiplier, term generator, storage element and in series with each other to form an output amplitude. An output controller is used for transferring the output amplitude to other apparatus and for incorporating quadrant unfolding elements.
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公开(公告)号：DE3854744D1
公开(公告)日：1996-01-11
申请号：DE3854744
申请日：1988-12-08
Applicant: QUALCOMM INC
Inventor： KERR RICHARD , WEAVER LINDSAY
IPC: H03M1/04 , G06F1/03 , G06F3/05 , G06J1/00 , H03B28/00 , H03M1/08 , H03M1/10 , H03M1/66 , G06F7/38
Abstract: A method and apparatus for reducing spurious output noise in digital frequency synthesizers employing sine amplitude converters connected to Digital-to-Analog converters to generate analog waveforms from sine amplitude data. Random or pseudorandom numbers having a value equal to or less than plus or minus one-half of a minimum quantization step or value change for the sine amplitude data are generated and added to the sine amplitude data with the resulting sum being transferred to the Digital-to-Analog converter. In one embodiment, a summation circuit is connected between an output of the sine function converter and an input of the Digital-to-Analog converter and also has a second input connected to a pseudorandom number generator which provides Pseudorandom numbers varying in value over a range of +/-1/2n+1 times a least significant step value, or bit for base 2, of a corresponding Digital-to-Analog input data value where n is greater than or equal to 1.
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公开(公告)号：AU767415B2
公开(公告)日：2003-11-06
申请号：AU4700800
申请日：2000-05-05
Applicant: QUALCOMM INC
Inventor： CLAXTON DANIEL D , KERR RICHARD , VIJ GAJINDER
Abstract: A detection circuit that detects the open and close state of a flip cover of a communications device. The detection circuit includes a resistive network and an analog-to-digital converter (ADC). When the flip cover is in the closed position, the circuit detects a unique resistive value through a set of contacts. This voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. When the flip cover is in the open position, the contacts are broken, thus, disabling the detection of the unique resistive value. The resulting voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. Software, programmed within the microprocessor, enables the communications device to operate in the appropriate mode according to the detection of the open/close state of the flip cover.
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公开(公告)号：CA2371097A1
公开(公告)日：2000-11-16
申请号：CA2371097
申请日：2000-05-05
Applicant: QUALCOMM INC
Inventor： CLAXTON DANIEL D , KERR RICHARD , VIJ GAJINDER
Abstract: A detection circuit that detects the open and close state of a flip cover of a communications device. The detection circuit includes a resistive network an d an analog-to-digital converter (ADC). When the flip cover is in the closed position, the circuit detects a unique resistive value through a set of contacts. This voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. When the flip cover is i n the open position, the contacts are broken, thus, disabling the detection of the unique resistive value. The resulting voltage level is converted from an analog signal to a digital signal via the AD for input into a microprocessor . Software, programmed within the microprocessor, enables the communications device to operate in the appropriate mode according to the detection of the open/close state of the flip cover.
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Patent Agency Ranking
公开(公告)号：HK1047509A1
公开(公告)日：2003-02-21
申请号：HK02109058
申请日：2002-12-13
Applicant: QUALCOMM INC
Inventor： CLAXTON DANIEL D , KERR RICHARD , VIJ GAJINDER
Abstract: A detection circuit that detects the open and close state of a flip cover of a communications device. The detection circuit includes a resistive network and an analog-to-digital converter (ADC). When the flip cover is in the closed position, the circuit detects a unique resistive value through a set of contacts. This voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. When the flip cover is in the open position, the contacts are broken, thus, disabling the detection of the unique resistive value. The resulting voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. Software, programmed within the microprocessor, enables the communications device to operate in the appropriate mode according to the detection of the open/close state of the flip cover.
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公开(公告)号：BR0011307A
公开(公告)日：2002-04-30
申请号：BR0011307
申请日：2000-05-05
Applicant: QUALCOMM INC
Inventor： CLAXTON DANIEL D , KERR RICHARD , VIJ GAJINDER
Abstract: A detection circuit that detects the open and close state of a flip cover of a communications device. The detection circuit includes a resistive network and an analog-to-digital converter (ADC). When the flip cover is in the closed position, the circuit detects a unique resistive value through a set of contacts. This voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. When the flip cover is in the open position, the contacts are broken, thus, disabling the detection of the unique resistive value. The resulting voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. Software, programmed within the microprocessor, enables the communications device to operate in the appropriate mode according to the detection of the open/close state of the flip cover.
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公开(公告)号：DE3854744T2
公开(公告)日：1996-08-08
申请号：DE3854744
申请日：1988-12-08
Applicant: QUALCOMM INC
Inventor： KERR RICHARD , WEAVER LINDSAY
IPC: H03M1/04 , G06F1/03 , G06F3/05 , G06J1/00 , H03B28/00 , H03M1/08 , H03M1/10 , H03M1/66 , G06F7/38
Abstract: A method and apparatus for reducing spurious output noise in digital frequency synthesizers employing sine amplitude converters connected to Digital-to-Analog converters to generate analog waveforms from sine amplitude data. Random or pseudorandom numbers having a value equal to or less than plus or minus one-half of a minimum quantization step or value change for the sine amplitude data are generated and added to the sine amplitude data with the resulting sum being transferred to the Digital-to-Analog converter. In one embodiment, a summation circuit is connected between an output of the sine function converter and an input of the Digital-to-Analog converter and also has a second input connected to a pseudorandom number generator which provides Pseudorandom numbers varying in value over a range of +/-1/2n+1 times a least significant step value, or bit for base 2, of a corresponding Digital-to-Analog input data value where n is greater than or equal to 1.
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公开(公告)号：AU4700800A
公开(公告)日：2000-11-21
申请号：AU4700800
申请日：2000-05-05
Applicant: QUALCOMM INC
Inventor： CLAXTON DANIEL D , KERR RICHARD , VIJ GAJINDER
Abstract: A detection circuit that detects the open and close state of a flip cover of a communications device. The detection circuit includes a resistive network and an analog-to-digital converter (ADC). When the flip cover is in the closed position, the circuit detects a unique resistive value through a set of contacts. This voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. When the flip cover is in the open position, the contacts are broken, thus, disabling the detection of the unique resistive value. The resulting voltage level is converted from an analog signal to a digital signal via the ADC for input into a microprocessor. Software, programmed within the microprocessor, enables the communications device to operate in the appropriate mode according to the detection of the open/close state of the flip cover.
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公开(公告)号：AU1403699A
公开(公告)日：1999-06-07
申请号：AU1403699
申请日：1998-11-12
Applicant: QUALCOMM INC
Inventor： WANG DAVID E , AZARTASH MAHMOUD , BRADLEY LARRY D , KERR RICHARD
Abstract: A system for providing a first signal to a flip circuit and receiving a second signal from the flip circuit over an electrical path adapted for use with a keypad having a keypad lighting circuit. The system includes a first circuit for providing the first signal to the flip circuit via a first electrical path, the first signal having alternating first and second states. A second circuit generates a second signal. A third circuit receives the second signal via the first electrical path. The second signal is received during the second state of the first signal. In a more specific embodiment, the first and second states are continuously alternating states. The first signal provides power to the flip circuit when the first signal is in the first state. The first circuit further includes a signal generator for adjusting a duty cycle of the first signal. The signal generator includes a voltage source, a switching circuit connected to the voltage source, and a control circuit connected to the switching circuit. The control circuit causes the switching circuit to output the first signal having first and second states at the duty cycle. The switching circuit includes a transistor having a control terminal connected to the control circuit. One terminal is connected to the voltage source and another terminal is connected to the electrical path. The second circuit includes a keypad. The flip circuit includes at least one light source to illuminate the keypad. The light source is powered by the first signal during the first state thereof. The second signal is generated by the keypad during the second state of the first signal. The keypad includes a plurality of resistive elements connected in a resistive ladder network. Each resistive element corresponds to a respective key of the keypad. A computer processes the second signal to ascertain which key is depressed.
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