H04Q1/45- Signalling arrangements Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling.H04Q1/444- Signalling arrangements Manipulation of signalling currents using alternate current with voice-band signalling frequencies.H04Q1/44- Signalling arrangements Manipulation of signalling currents using alternate current.H04Q1/30- Signalling arrangements Manipulation of signalling currents.H04Q1/00- Details of selecting apparatus or arrangements.H03K3/00- Circuits for generating electric pulses Monostable, bistable or multistable circuits.Assignors: PARK, JAE-MIN Application granted granted Critical Publication of US5978388A publication Critical patent/US5978388A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). reassignment SAMSUNG ELECTRONICS CO., LTD., A KOREAN CORP. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from KR95-67864 external-priority Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd Assigned to SAMSUNG ELECTRONICS CO., LTD., A KOREAN CORP. Original Assignee Samsung Electronics Co Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US08/777,141 Inventor Jae-Min Park Current Assignee (The listed assignees may be inaccurate. Provides a door bell and/or alarm sounds over an existing paging system, for such applications as door entry, fire, severe weather, etc.- Google Patents US5978388A - Tone generatorÄownload PDF Info Publication number US5978388A US5978388A US08/777,141 US77714196A US5978388A US 5978388 A US5978388 A US 5978388A US 77714196 A US77714196 A US 77714196A US 5978388 A US5978388 A US 5978388A Authority US United States Prior art keywords tone control signal outputting signal tone period Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.Signal the beginning and end of shifts, breaks, and lunch periods for factories and other businesses.Signal the beginning and end of class periods, breaks, and lunch periods for schools.for factories, schools, or any business requiring an audible indication of specified times.Ä®ach day of the week can be programmed to either on or off, allowing you to turn off the alert tones during specific days of the week (weekends, etc.)The CTG-1 has three contact closure inputs for triggering an emergency siren, evacuation signal or a door bell sound. These tone/buzzer sounds are ideal for indicating the start and end of shifts, break times, lunch periods, etc. The CTG-1 can be programmed to output single, double or triple alert tones or buzzer sounds with up to 128 events in a 24 hour period. Viking's model CTG-1 is a clock controlled tone generator designed to provide accurately timed alert tones or buzzer sounds over an existing paging system. Add Time Controlled Alert Tones and Emergency Tones to Your Paging System
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