Telephone repeater and portable telephone communication systems utilizing power line carrier currents

Claim 1

AN ASSEMBLY FOR USE WITH A LOCAL TELEPHONE AND WITH A REMOTE CARRIER RECEIVER TUNED TO A FIRST FREQUENCY AND OBTAINING ITS CURRENT FROM A POWER NETWORK ALSO USED FOR OTHER PURPOSES AND WITH A REMOTE CARRIER TRANSMITTER OPERATING AT A SECOND FREQUENCY AND OBTAINING ITS CURRENT FROM SAID NETWORK, SAID ASSEMBLY INCLUDING A STRUCTURE EXTRANEOUS TO SAID LOCAL TELEPHONE FOR SUPPORTING AND POSITIONING THE HANDSET THEREOF; A PICKUP DEVICE SO CONSTRUCTED AND POSITIONED WITH RESPECT TO SAID STRUCTURE THAT IT WILL PICK UP THE MODULATIONS BEING RECEIVED BY THE EAR UNIT OF SAID HANDSET; A FIRST MICROPHONE RESPONSIVE TO THE SOUND OF THE BELL ASSOCIATED WITH SAID TELEPHONE; A FIRST CARRIER TRANSMITTER TUNED FOR TRANSMITTING ON SAID FIRST FREQUENCY AND INCORPORATING A TRANSMISSION CONTROL ELEMENT THAT WHEN BIASED AT A FIRST POTENTIAL WILL PREVENT TRANSMISSION UNLESS THE SOUND ENTERING SAID FIRST MICROPHONE IS ABOVE A PREDETERMINED LEVEL AND WHEN BIASED AT A SECOND POTENTIAL WILL PERMIT NORMAL TRANSMISSION; A FIRST CARRIER RECEIVER TUNED TO SAID SECOND FREQUENCY AND COMPRISING A FIRST SPEAKER SO POSITIONED WITH RESPECT TO SAID STRUCTURE THAT SOUND FROM SAID FIRST SPEAKER WILL BE DIRECTED INTO THE MOUTH UNIT OF SAID HANDSET; A FIRST POWER-SUPPLY UNIT FOR SAID FIRST CARRIER TRANSMITTER AND SAID FIRST CARRIER RECEIVER, SAID FIRST POWER SUPPLY UNIT HAVING A FIRST PAIR OF ELECTRIC CONDUCTORS FOR CONNECTING IT TO SAID POWER NETWORK; MEANS FOR ELECTRICALLY CONNECT-