公开(公告)号：AU1101999A

公开(公告)日：1999-05-10

申请号：AU1101999

申请日：1998-10-19

Applicant: QUALCOMM INC

Inventor： AZARTASH MAHMOUD ,  MCCAUGHAN CAROLYN ,  SPENCER REGINALD N ,  HUBBARD WILLIAM A

IPC: H04M1/02

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

IPC: G09G5/00 ,  H04M1/02 ,  H04M1/22

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.

公开(公告)号：WO9925171A3

公开(公告)日：1999-09-10

申请号：PCT/US9824156

申请日：1998-11-12

Applicant: QUALCOMM INC

Inventor： WANG DAVID E ,  AZARTASH MAHMOUD ,  BRADLEY LARRY D ,  KERR RICHARD

IPC: G09G5/00 ,  H04M1/02 ,  H04M1/22

CPC classification number: H04M1/22 ,  H04M1/0214 ,  H04M1/23

Abstract: A system for providing a first signal to a flip circuit (20) and receiving a second signal from the flip circuit (20) over an electrical path (24, 30) adapted for use with a keypad (42) having a keypad lighting circuit (52). The system includes a first circuit (64, 66, R1, R2, R3, R4) for providing the first signal to the flip circuit (20) via a first electrical path (24, 30), the first signal having alternating first and second states (94, 96). A second circuit (42) generates a second signal. A third circuit (R4, 68, C1, C2) receives the second signal via the first electrical path. The second signal is received during the second state (96) of the first signal. In a more specific embodiment, the first and second states (94, 96) are continuously alternating states. The first signal provides power to the flip circuit (20) when the first signal is in the first state (94). The first circuit further includes a signal generator (64) for adjusting a duty cycle of the first signal. The signal generator (64) 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 (66) having a control terminal connected to the control circuit. One terminal is connected to the voltage source (62) and another terminal is connected to the electrical path. The second circuit includes a keypad. The flip circuit (20) includes at least one light source (72) to illuminate the keypad (42). The light source is powered by the first signal during the first state (94) thereof. The second signal is generated by the keypad (42) during the second state (96) of the first signal. The keypad (42) includes a plurality of resistive elements (82) connected in a resistive ladder network. Each resistive element corresponds to a respective key of the keypad (42). A computer (42) processes the second signal to ascertain which key is depressed.

Abstract translation: 一种用于通过适用于具有小键盘照明电路的小键盘（42）的电路径（24,30）提供第一信号到翻转电路（20）和从翻转电路（20）接收第二信号的系统 52）。 该系统包括用于经由第一电气路径（24,30）向翻转电路（20）提供第一信号的第一电路（64,66，R1，R2，R3，R4），第一信号具有交替的第一和第二 （94,96）。 第二电路（42）产生第二信号。 第三电路（R4,68，C1，C2）经由第一电气路径接收第二信号。 第二信号在第一信号的第二状态（96）期间被接收。 在更具体的实施例中，第一和第二状态（94,96）是连续交替的状态。 当第一信号处于第一状态（94）时，第一信号向翻转电路（20）提供功率。 第一电路还包括用于调整第一信号的占空比的信号发生器（64）。 信号发生器（64）包括电压源，连接到电压源的开关电路以及连接到开关电路的控制电路。 控制电路使开关电路在占空比处输出具有第一和第二状态的第一信号。 开关电路包括具有连接到控制电路的控制端子的晶体管（66）。 一个端子连接到电压源（62），另一个端子连接到电气路径。 第二个电路包括一个键盘。 翻转电路（20）包括至少一个光源（72）以照亮键盘（42）。 光源在其第一状态（94）期间由第一信号供电。 第二信号在第一信号的第二状态（96）期间由小键盘（42）产生。 键盘（42）包括连接在电阻梯形网络中的多个电阻元件（82）。 每个电阻元件对应于小键盘（42）的相应键。 计算机（42）处理第二信号以确定哪个键被按下。