Device for switching on and off and adjusting the volume of communications equipment, such as transceivers
AssigneeKrone Aktiengesellschaft
InventorKlaus Hornburg
Life of this patent
Estimating the term…
Abstract
Improved apparatus for switching on and off and adjusting the volume of communications equipment employs a non-latching button, a delay element for producing a time delay determined by the pressure time on the button, a volume adjusting device for adjusting the amplification of an amplifier and a relay control for turning the amplifier off and on. The button is coupled to both the volume adjusting device and the relay control via the delay element in such a fashion that, depending on the delay time, either a switching or a volume adjustment results. An automatic shutoff can also be provided for shutting off the power supply to the amplifier after the loop current is interrupted.
Claims12
Apparatus for switching on, switching off and adjusting the volume of communications equipment such as transceivers, said apparatus comprising:
- a non-latching button for selectively completing an electrical circuit within said apparatus;
- amplifier means;
- volume control means selectively connected to said amplifier means and adapted to provide continuous substantially linear control of said amplifier means;
- a power supply internal to said apparatus, said non-latching button being coupled to said power supply, said power supply having a source lead and a return terminal;
- means adapted to connect said power supply to an external source of electrical power;
- relay means for connecting said power supply to and disconnect said power supply from said volume control means;
- means for controlling said relay means;
- time delay means connected between said non-latching button and both said relay control means and said volume control means, said time delay having a predetermined timing period;
- and
- automatic switching-off means actuating said relay control means to disconnect said power supply and said amplifier means when loop current in said apparatus is interrupted;
- whereby short duration, less than said predetermined timing period, depression of said non-latching button turns said amplifier on and off by connecting and disconnecting said power supply and said amplifier, and depression of said non-latching button for greater than said predetermined timing period adjusts the volume of said amplifier through said volume control means.
Apparatus according to claim 4 wherein said time delay means comprises:
- a second inverter means having an input and an output, said output being a second logic state;
- a third capacitor means connected to said second inverter means input and to said power supply return;
- a third resistor means connected to said first inverter means output which provides a first logic state delayed from said second logic state, said third resistor also being connected to said second inverter input;
- and
- a fourth resistor means connected to said second inverter means output and to said counter enable input.
Dependencies are inferred from the claim text.