Solid state security system

• US 3,990,075 A
• Filed: 05/29/1975
• Issued: 11/02/1976
• Est. Priority Date: 05/29/1975
• Status: Expired due to Term

• Current Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Schmitz, Lawrence S., Drumheller, Warren D.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US05/581,619
• Time in Patent Office: 523 Days
• Field of Search: 340/420, 340/416, 340/410, 340/414, 340/226, 340/213 R, 340/253 C, 340/384 E, 340/409, 340/312, 340/279, 340/276
• US Class Current: 340/502
• CPC Class Codes: G08B 25/014 Alarm signalling to a central station with two-way communication, e.g. with signalling back
• CPC Class Codes: G08B 29/04 Monitoring of the detection circuits

Abstract

A solid state security system employing a single "chip" integrated circuit as the primary electronics located within a compact security console to provide electronic interface with one or more remote monitoring channels including a telephone dialer channel, an annunciator display, a multiplex channel suitable for processing alarm signals from a plurality of security consoles, and an intercom system suitable for providing two-way verbal communication between one or more security consoles and a central control access location.

Claims

1. A solid state security system comprising,

at least one remote intrusion sensor circuit for producing intrusion alarm output signals in response to intrusion alarm conditions,

at least one remote fire sensor circuit for producing fire alarm output signals in response to fire alarm conditions,

a remote monitoring center,

a local security console operatively coupling said remote fire sensor circuit and said remote intrusion sensor circuit to said remote monitoring center, said local security console including:

microphone means for providing verbal communication between said local security console and said remote monitoring center,

input circuit means operatively connected to said remote fire sensor circuit and said remote intrusion sensor circuit and responding to a fire alarm output signal by developing a first digitally modulated, frequency modulated digital audio waveform indicative of a fire alarm condition and responding to an intrusion alarm output signal by developing a second digitally modulated, frequency modulated digital audio output waveform indicative of an intrusion alarm condition, and control circuit means operatively connected between said input circuit means and said microphone means for enabling said microphone means in the absence of alarm conditions, disabling said microphone means during a fire alarm condition and enabling said microphone means after the expiration of a predetermined time period following the occurrence of an intrusion alarm condition.

2. A solid state security system as claimed in claim 1 further including a telephone communications channel connected between said primary electronics and said remote monitoring center, wherein a digital output signal of said primary electronics indicative of a particular alarm condition initiates a telephone transmission of predetermined information representative of said alarm condition to said remote monitoring center.

3. A solid state security system as claimed in claim 1 wherein said local security console further includes, a digital noise generator circuit means driven by a digital pulse wave excitation circuit operatively connected to said input circuit means and said control circuit means to produce a first digitally modulated frequency modulated digital audio output waveform in response to a first digital output signal and a second digitally modulated frequency modulated digital audio output waveform in response to a second digital output signal and speaker means for manifesting said digital audio output waveforms.

4. A solid state security system as claimed in claim 3 wherein said control circuit means functions to transmit the digitally modulated, frequency modulated digital audio output waveform indicative of an intrusion alarm condition to said speaker means and terminate the digital audio output waveform indicative of an intrusion alarm condition during a predetermined time interval to permit verbal communication between said local security console and said remote monitoring center.

5. A solid state security system as claimed in claim 1 wherein said local security console further includes an emergency actuator means operatively connected to said input circuit means and said control circuit means, said input circuit means responding to an actuation of said emergency actuator means by developing a digital output signal indicative thereof, said control circuit means enabling said microphone means in response to an actuation of said emergency actuator means.

6. A solid state security system as claimed in claim 1 wherein said local security console includes an alarm acknowledge light, and circuit means operatively connected between said local security console and said remote monitoring center to activate said alarm acknowledge light in response to a signal transmitted from said remote monitoring center.