Browse Prior Art Database

RADIO DUAL PTT/BUTTON PRESS OPTION ENABLE

IP.com Disclosure Number: IPCOM000006329D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-25
Document File: 2 page(s) / 115K

Publishing Venue

Motorola

Related People

Allen L. Christenson: AUTHOR [+3]

Abstract

Portable radio products' control push button switches can be functionally expanded by allowing a radio fea- ture to be controlled by a dual switch closure. A single press of a control button would activate the ~switch's normal function, but a quick double closure of that same switch would control a different feature. This article pri- marily addresses two different switches: the radio's or remote microphone's PIT switch and the LED display back lighting switch. The concept could be applied to any of the radio's pushbutton control switches.

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MOTOROLA INC. Technical Developments Volume14 December 1991

RADIO DUAL PTT/BUTTON PRESS OPTION ENABLE

by Allen L. Christenson, Henry A. Bogut and Joseph Patino

  Portable radio products' control push button switches can be functionally expanded by allowing a radio fea- ture to be controlled by a dual switch closure. A single press of a control button would activate the ~switch's normal function, but a quick double closure of that same switch would control a different feature. This article pri- marily addresses two different switches: the radio's or remote microphone's PIT switch and the LED display back lighting switch. The concept could be applied to any of the radio's pushbutton control switches.

  The implementation includes a software algorithm or hardware circuit to detect a quick double switch closure, generate a control signal, then activate the double switch control feature. The switch appears to operate normally but includes a short delay period, Tl, of approximately 0.25 seconds, so that the fast of two closures does not activate the switch's normal function immediately Once the switch is held down for longer than this delay time, Tl, the single push function ofthe switch is activated as normal.

  The operation of the detect scheme is similar for both hardware or software. The first falling edge of the moni- tored switch line is counted; if another falling edge is not counted within time, Tw, approximately 1 second, the counter resets and is ready to count the next falling edge of the line as the fust closure of the switch. If another falling edge is counted before time, Tw, expires, then a signal is sent out that a double switch closure has occurred. This output signal is then utilized by the radio's microcontroller to activate the double closure function associated with that switch. The counter is reset by the next (third) falling edge of the switch line or by a so&are command signal aller the microcontroller has completed its double switch function.

  Radio Service Software (RSS) is utilized to assign the double closure function to a radio control switch. In the RSS programming mode, the switch is selected. Then, the double closure function is selected to be assigned to that switch.

This concept finds a variety of applications. The radio's PTT switch utilizes it to put the radio in a special

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mode, or to enable/disabla other radio features in a tog- gle style manner. The special modes of the radio include but are not limited to: live mic, unit ID transmit, or emergency signal transmit. See attached Ilgure for RSS assignment example: Assigning "Live Mic" to double activation of the PTT switch. For the assignment exam- ple shown, a quick double PM' click could cause the radio to go into a "live mic" mode until the next press...