| ReturnTo Theme-Group-Choice | Onelevelup |
| 5K038 | INTERCONNECTED COMMUNICATION SYSTEMS, INTERCOMS, AND INTERPHONES | |
| H04M9/00 -9/10 | ||
| H04M9/00-9/10 | AA | AA00 PURPOSE AND EFFECTS |
AA01 | AA02 | AA03 | AA05 | AA06 | AA07 | AA08 | AA09 | ||
| . Improved economics | . . Simplification of the circuit configuration | . . Reduction of the number of communication line | . Functional improvements | . . Provision of additional functions | . . Improved call quality or characteristics | . Improved reliability | . Ease of construction | |||||
| BB | BB00 APPLICATIONS |
BB01 | BB02 | BB03 | ||||||||
| . Hospitals | . Assisted living (e.g., for the elderly, children, or the physically handicapped) | . Hotels | ||||||||||
| CC | CC00 BASIC STRUCTURE OF THE SYSTEM |
CC01 | CC02 | CC03 | CC04 | CC05 | CC06 | CC08 | CC09 | CC10 | ||
| . One-to-one structures (drawing) | . . One subordinate station for one main station (drawing) | . Multiple subordinate stations for one main station | . . Radial configurations (drawing) | . . Serial configurations | . Multiple subordinate stations for multiple main stations (drawing) | . Multiple main stations (drawing) | . . Multiple main stations on a common line | . . Multiple main stations with controllers (drawing) | ||||
| CC11 | CC12 | CC13 | ||||||||||
| . Collective dwellings or for home buses | . . Hallway intercoms | . . . Office intercoms | ||||||||||
| DD | DD00 DEVICES AND CIRCUITS |
DD01 | DD02 | DD03 | DD04 | DD05 | DD06 | DD07 | DD08 | DD09 | DD10 | |
| . Provision of a hand set | . Automatic volume control | . Hybrid circuits | . Provision of multiple microphones for a single station | . Voice mixing | . Voice switches | . Time-control circuits | . Control of selection or switching | . Power sources or power-supply circuits | . Expanders | |||
| DD11 | DD12 | DD13 | DD14 | DD15 | DD16 | DD18 | ||||||
| . Indication devices and circuits | . . Visible indication | . . . Lamps or light-emitting diodes | . . . Alpha or numeric characters | . . . Images | . . Audible indication | . Sensors | ||||||
| DD21 | DD22 | DD23 | DD24 | DD25 | ||||||||
| . Devices or circuits for coupling with other devices | . . Telephone lines | . . Televisions | . . Radios or receivers | . . Transceivers | ||||||||
| EE | EE00 TRANSMISSION SYSTEMS |
EE01 | EE02 | EE03 | EE05 | EE07 | EE08 | EE09 | ||||
| . Transmission paths | . . Wired paths | . . . Use of call lines for transmission of other information | . . Wireless paths | . Transmission media | . . Carrier waves or radio waves | . . Light | ||||||
| EE11 | EE12 | EE13 | EE15 | EE16 | EE17 | |||||||
| . Forms of signals | . . Analog signals | . . Digital signals | . Multiplex systems | . . Time-division multiplex systems | . . Frequency-division or wavelength-division systems | |||||||
| FF | FF00 BASIC FUNCTIONS RELATED TO CALLING |
FF01 | FF02 | FF03 | FF04 | FF05 | FF06 | FF07 | FF08 | FF09 | FF10 | |
| . Calling | . Station selection | . Prioritization | . Monitoring | . Private calling | . Measures for noise | . Expansion | . Conference or group calls | . Interruptions | . Loudspeakers | |||
| FF11 | FF12 | FF13 | FF14 | |||||||||
| . Remote calls | . Transfer | . Prevention of howling | . Prevention of crosstalk | |||||||||
| GG | GG00 ADDITIONAL FUNCTIONS OTHER THAN CALLING |
GG01 | GG02 | GG03 | GG04 | GG05 | GG06 | GG07 | ||||
| . Batch calling, broadcasting, or paging | . Alarms | . Recording, reproduction, or automatic answering | . Voice recognition | . Remote control or data collection | . . Home automation or electric locks | . Maintenance and detection of faults |