Television door intercom apparatus
US7015946B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 2002 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Aug 18, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/186
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television door intercom apparatus improves recognition performance for a resident inside a house to recognize a visitor conducting a call operation at the entrance and security in responding to the call. A call detection circuit 31 of a residential master station 2 detects a call when a visitor pushes a call button 11 of a door intercom substation 1, activates a signal generator circuit 32 and causes a master station speaker 39 to output a call sound so that a communication can be exchanged between a substation microphone 16 and a substation speaker 17 of the door intercom substation and a master station microphone 38 and the master station speaker of the residential master station. When a picture monitor 36 of the residential master station displays a picture taken by a camera 13 of the door intercom substation, the residential master station further includes a message transmission circuit 34 activated when the call detection circuit detects the call, for causing the substation speaker to output a message content of a message storage circuit 33 storing in advance a predetermined message.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.