Telephone hybrid arrangement with frequency separation for use with tdm systems

Claim 2

A telephone hybrid arrangement for use in conjunction with switching equipment of the time division multiplex type comprising: a. means for deriving a signal from the switching equipment including a carrier component based on the time division multiplex frame rate, b. means for feeding said signal including the carrier component onto a two-wire transmission line leading to a substation, c. means at the substation for feeding voice signals onto the transmission line, d. means for directing voice signals from the transmission line into the time division multiplex system, e. means for blocking signals from said deriving means from entering the time division multiplex system, and f. means at said substation connected to said transmission line for deriving voice signals from said signal including the carrier component.

Claim 3

A telephone hybrid arrangement for use in conjunction with a telephone system of the kind wherein a telephone subset is connected by a two-wire line to a time division multiplex switching center comprising: a. a low pass filter at the switching center connected between the two-wire line and inputs to the time division multiplex highway, b. a band pass filter at the switching center connected between the two-wire line and outputs from the time division multiplex highway for transmitting signals including carrier components based upon the time division multiplex switching rate to the two-wire line, the low frequency cutoff of said band pass filter being higher than the cutoff frequency of said low pass filter, and a substation including means for applying signals within the frequency range passed by said low pass filter to said two-wire line, and means for deriving signals from said signals including carrier components.

Claim 4

A telephone hybrid arrangement for use in conjunction with a telephone system of the kind wherein a telephone subset is connected by a two-wire line to a time division multiplex switching center comprising: a. a low pass filter at the switching center connected between the two-wire line and inputs to the time division multiplex highway, b. a band pass filter at the switching center connected between the two-wire line and outputs from the time division multiplex highway for transmitting signals including carrier components based upon the time division multiplex switching rate to the two-wire line, the low frequency cutoff of said band pass filter being higher than the cutoff frequency of said low pass filter, and a substation including means for applying signals within the frequency range passed by said low pass filter to said two-wire line, and means for deriving signals from said signals including carrier components.

Claim 5

A telephone hybrid arrangement for use in conjunction with a telephone system of the kind wherein a telephone subset is connected by a two-wire line to a time division multiplex switching center comprising: a. a low pass filter at the switching center connected between the two-wire line and inputs to the time division multiplex highway, b. a band pass filter at the switching center connected between the two-wire line and outputs from the time division multiplex highway for transmitting signals including carrier components based upon the time division multiplex switching rate, the low frequency cutoff of said band pass filter being higher than the cutoff frequency of said low pass filter, c. a band pass filter at the subset connected between the two-wire line and the subset receiver and having generally similar band pass characteristics as said band pass filter at the center, d. a demodulator connected at the subset between said band pass filter thereat and the receiver, and e. means at said subset connected to apply signals from the subset transmitter to the two-wire line.

Claim 6

A telephone hybrid arrangement for use in conjunction with a telephone system of the kind wherein a telephone subset is connected by a two-wire line to a time division multiplex switching center comprising: a. a low pass filter at the switching center connected between the two-wire line and inputs to the time division multiplex highway, b. a band pass filter at the switching center connected between the two-wire line and outputs from the time division multiplex highway for transmitting signals including carrier components based upon the time division multiplex switching rate, the low frequency cutoff of said band pass filter being higher than the cutoff frequency of said low pass filter, c. a band pass filter at the subset connected between the two-wire line and the subset receiver and having generally similar band pass characteristics as said band pass filter at the center, d. a demodulator connected at the subset between said band pass filter thereat and the receiver, and e. means at said subset connected to apply signals from the subset transmitter to the two-wire line.

Claim 7

A telephone hybrid arrangement according to claim 3, and further including an amplifier connected at the subset between the receiver and said band pass filter thereat.

Claim 8

A telephone hybrid arrangement according to claim 3, wherein said band pass filters are centered at a frequency equal to the time frame rate of the time division multiplex system.

Claim 9

A telephone hybrid arrangement according to claim 3, wherein said band pass filters are centered at a frequency equal to a selected harmonic of the time frame rate of the time division multiplex system.