Cordless transmitting and receiving apparatus
First Claim
1. A cordless transmitting and receiving apparatus which is capable of providing transmitting and receiving between a key transmitting and receiving apparatus as a fixed station and a portable remote transmitting and receiving apparatus and in which a transmission signal from the key transmitting and receiving apparatus is received in the remote transmitting and receiving apparatus by electromagnetic induction through a commercial AC power line,said remote transmitting and receiving apparatus comprising a transmitting station including an aural signal transmitting circuit and a first antenna for transmitting an output signal of said circuit and a receiving station including a second antenna electromagnetically coupled to an AC line and a receiving circuit for converting the output signal of said second antenna into an aural signal to put out the latter,said key transmitting and receiving apparatus comprising a receiving circuit electrically connected to the AC line, a signal shunt for transmitting an output signal of said receiving circuit to an external telephone line and a transmitting circuit for putting out the transmission signal from said external telephone line to the AC line through the signal shunt circuit,said cordless transmitting and receiving apparatus further comprising a relay transmitter including a third antenna for receiving an output signal of the first antenna of the remote transmitting and receiving apparatus, a frequency converter for frequency-converting the output signal of said third antenna and connection means for applying the output signal of said frequency converter to the AC line.
1 Assignment
0 Petitions
Accused Products
Abstract
A cordless transmitting and receiving apparatus which is capable of providing transmitting and receiving between a key transmitting and receiving apparatus such as a telephone and a portable remote transmitting and receiving apparatus and in which a transmission signal from the key transmitting and receiving apparatus is received in the remote transmitting and receiving apparatus by electromagnetic induction through a commercial AC power line. The cordless transmitting and receiving apparatus has a relay transmitter, which transmits a transmission signal from said remote transmitting and receiving apparatus to said key transmitting and receiving apparatus through said AC line. The receiving circuit of said key transmitting and receiving apparatus is electrically connected to said AC line whereby the transmission signal from said transmitting and receiving apparatus is transmitted to said relay transmitter in a wireless fashion and transmitted between said relay transmitter and said key transmitting and receiving apparatus by said AC line.
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Citations
5 Claims
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1. A cordless transmitting and receiving apparatus which is capable of providing transmitting and receiving between a key transmitting and receiving apparatus as a fixed station and a portable remote transmitting and receiving apparatus and in which a transmission signal from the key transmitting and receiving apparatus is received in the remote transmitting and receiving apparatus by electromagnetic induction through a commercial AC power line,
said remote transmitting and receiving apparatus comprising a transmitting station including an aural signal transmitting circuit and a first antenna for transmitting an output signal of said circuit and a receiving station including a second antenna electromagnetically coupled to an AC line and a receiving circuit for converting the output signal of said second antenna into an aural signal to put out the latter, said key transmitting and receiving apparatus comprising a receiving circuit electrically connected to the AC line, a signal shunt for transmitting an output signal of said receiving circuit to an external telephone line and a transmitting circuit for putting out the transmission signal from said external telephone line to the AC line through the signal shunt circuit, said cordless transmitting and receiving apparatus further comprising a relay transmitter including a third antenna for receiving an output signal of the first antenna of the remote transmitting and receiving apparatus, a frequency converter for frequency-converting the output signal of said third antenna and connection means for applying the output signal of said frequency converter to the AC line.
Specification