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Browse Prior Art Database

DISPLAY BAR WITH DOUBLE FUNCTION

IP.com Disclosure Number: IPCOM000005456D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2001-Oct-10
Document File: 1 page(s) / 52K

Publishing Venue

Motorola

Related People

Larry Blair: AUTHOR

Abstract

Presently on mobile radio control heads, volume and squelch levels are controlled by a knob on the control head. The knobs physlcal positlon indicates the volume or squelch setting. There is a separate knob for volume and squelch.

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Re O&A Technical Developments Volume 2

January 1982

DISPLAY BAR WITH DOUBLE FUNCTION

By Larry Blair

   Presently on mobile radio control heads, volume and squelch levels are controlled by a knob on the control head. The knobs physlcal positlon indicates the volume or squelch setting. There is a separate knob for volume and squelch.

   In the proposed control head, volume and squelch are controlled by keys (see Figure 1). Since the keys do not indicate the level setting, some visual indicator is needed. A LED or LDC display bar can be used. The volume bar and the squelch bar can be combined into one bar. Volume level is normally in- dicated. The squelch level is displayed by momentarily pressing a squelch key. The squelch display for- mat is different from the volume display format. A few seconds after the squelch key is released, the display reverts back to the volume mode. Figure 2 shows two possible formats for volume and squelch.

   The proposed control head is best suited for radios that are controlled by a microprocessor. The keys and the display bar are interfaced to a microprocessor. The microprocessor reads the keys and updates the volume or squelch level to the display bar. When one of the volume keys is pressed, the microprocessor sends a volume up or down command to the volume control circuitry and updates the display bar with volume information.

   When one of the squelch keys is pressed, the microprocessor sends a squelch up or down command to the squelch contro...