# US 5,708,701 A · Power line telephone communications system having on hook digital voiceband messaging

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- Number: US 5,708,701 A
- Document ID: US5708701A
- Status: Granted
- Kind: A
- Application number: 08/503,190
- Filed: 1995-07-17
- Granted: 1998-01-13
- Earliest claimed: 1995-07-17
- Assignees: Elcom Technologies Corporation
- Inventors: Felix Houvig; Chandrakant Bhailalbhai Patel
- Web page: https://patentgrep.com/patent/US5708701A

## CPC

- H04B 3/542: {the information being in digital form}
- H04M 1/71: Substation extension arrangements
- H04B 2203/5416: by adding signals to the wave form of the power source
- H04B 2203/5437: Wired telephone
- H04B 2203/5445: Local network
- H04B 2203/545: Audio/video application, e.g. interphone
- H04B 2203/5458: Monitor sensor; Alarm systems
- H04B 2203/5483: using coupling circuits
- H04M 1/57: Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set (at the operator set in a manual exchange H04M5/20)
- H04B: TRANSMISSION
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)

## Abstract

A power line telephone communications system having an ON HOOK digital voiceband messaging feature by which selected information contained in an incoming call to a telephone is received prior tc the telephone being lifted off its hook. The incoming ring signals, ON HOOK digital voiceband messaging and information signals are conducted by a base unit to the power line for transmission to an extension unit to which a telephone is connected.

## Claims

### Claim 1

A power line telephone communications system having ON HOOK digital voiceband messaging comprising:
means for supplying:
(a) first telephone signals transmitted from a telephone line and including:
(1) ring signals indicating an incoming call to the telephone,
(2) ON HOOK digital voiceband signals representative of selected information, and
(3) first information signals representative of OFF HOOK communications from the telephone line, and
(b) second telephone signals transmitted from the telephone and including:
(1) ON HOOK/OFF HOOK status signals indicating the status of the telephone, and
(2) second information signals representative of OFF HOOK communications from the telephone;
a base unit for receiving said first telephone signals from the telephone line and including:
(a) means responsive to said ring signals for generating a gated ring tone signal having a frequency at the upper end of the voiceband frequency range for each of said ring signals,
(b) first detecting means responsive to said ON HOOK/OFF HOOK status signals for determining when the telephone is ON HOOK and when the telephone is OFF HOOK, and
(c) a first information path responsive to said first detecting means for passing said gated ring tone signals, said ON HOOK digital voiceband signals, and said first information signals;
a power line to which said base unit is connected and along which said gated ring tone signals, said ON HOOK digital voiceband signals, and said first information signals are transmitted for reception by the telephone and along which said second telephone signals are transmitted to said base unit for reception at the telephone line; and
an extension unit connected between said power line and the telephone for receiving from said power line said gated ring tone signals, said ON HOOK digital voiceband signals, and said first information signals and for conducting to said power line said second telephone signals, said extension unit adapted for connection to an indicator which indicates said selected information of said ON HOOK digital voiceband signals and including:
(a) second detecting means responsive to said ON HOOK/OFF HOOK status signals for determining when the telephone is ON HOOK and when the telephone is OFF HOOK, and
(b) a second information path responsive to said second detecting means for passing said ON HOOK digital voiceband signals to the indicator when the telephone is ON HOOK.

### Claim 2 (depends on 1)

A power line telephone communications system according to claim 1 wherein said first information path includes a telephone interface at which said first telephone signals are received and said first information path extends from said telephone interface to said power line.

### Claim 3 (depends on 1)

A power line telephone communications system according to claims 1 wherein said first information path includes a telephone interface at which said first telephone signals are received and through which said ON HOOK digital voiceband signals, said first information signals, and said gated ring tone signals pass and said first information path extends from said telephone interface to said power line.

### Claim 4 (depends on 1)

A power line telephone communications system according to claim 1 wherein said first information path includes:
(a) a telephone interface at which said first telephone signals are received and through which said ON HOOK digital voiceband signals and said first information signals pass,
(b) a modulator connected to said telephone interface and at which a carrier signal is modulated by said ON HOOK digital voiceband signals, said first information signals, and said gated ring tone signals, and
(c) an auxiliary path for conducting said gated ring tone signals directly to said modulator from said gated ring tone signal generating means, and
said first information path extends from said telephone interface to said power line.

### Claim 5

A power line telephone communications system having ON HOOK digital voiceband messaging comprising:
means for supplying:
(a) first telephone signals transmitted from a telephone line for reception by a telephone, said first telephone signals including:
(1) ring signals indicating an incoming call to the telephone,
(2) ON HOOK digital voiceband signals occurring between the first and the second ring signals representative of selected information, and
(3) first information signals representative of OFF HOOK communications from the telephone line, and
(b) second telephone signals transmitted from the telephone for reception at the telephone line, said second telephone signals including:
(1) ON HOOK/OFF HOOK status signals indicating the status of the telephone, and
(2) second information signals representative of OFF HOOK communications from the telephone;
a power line along which said first telephone signals are transmitted for reception by the telephone and said second telephone signals are transmitted for reception at the telephone line;
a base unit connected between the telephone line and said power line for conducting to said power line said first telephone signals and for receiving from said power line said second telephone signals, said base unit including:
(a) first detecting means responsive to said ON HOOK/OFF HOOK status signals for determining when the telephone is ON HOOK and when the telephone is OFF HOOK, and
(b) a first information path responsive to said first detecting means for passing:
(1) said ring signals to said power line when the telephone is ON HOOK,
(2) said ON HOOK digital voiceband signals to said power line when the telephone is ON HOOK, and
(3) said first information signals to said power line when the telephone is OFF HOOK,
(c) a second information path responsive to said first detecting means for passing:
(1) said ON HOOK/OFF HOOK status signals to the telephone line when the telephone is ON HOOK,
(2) said ON HOOK/OFF HOOK status signals to the telephone line when the telephone is OFF HOOK, and
(3) said second information signals to the telephone line when the telephone is OFF HOOK; and
an extension unit connected between said power line and the telephone for receiving from said power line said first telephone signals and for conducting to said power line said second telephone signals, said extension unit adapted for connection to an indicator which indicates said selected information of said ON HOOK digital voiceband signals and including:
(a) second detecting means responsive to said ON HOOK/OFF HOOK status signals for determining when the telephone is ON HOOK and when the telephone is OFF HOOK,
(b) a third information path responsive to said second detecting means for passing:
(1) said ON HOOK digital voiceband signals to the indicator when the telephone is ON HOOK,
(2) said ring signals to the telephone when the telephone is ON HOOK, and
(3) said first information signals to the telephone when the telephone is OFF HOOK,
(c) a fourth information path responsive to said second detecting means for passing:
(1) said ON HOOK/OFF HOOK status signals to said power line when the telephone is ON HOOK,
(2) said ON HOOK/OFF HOOK status signals to said power line when the telephone is OFF HOOK, and
(3) said second information signals to said power line when the telephone is OFF HOOK.

### Claim 6

A power line telephone communications system having ON HOOK digital voiceband messaging comprising:
means for supplying:
(a) first telephone signals transmitted from a telephone line and including:
(1) ring signals indicating an incoming call,
(2) ON HOOK digital voiceband signals representative of selected information, and
(3) first information signals representative of OFF HOOK communications from the telephone line, and
(b) second telephone signals transmitted from the telephone and including:
(1) ON HOOK/OFF HOOK status signals indicating the status of the telephone, and
(2) second information signals representative of OFF HOOK communications from the telephone;
a power line;
a base unit connected between the telephone line and said power line for conducting to said power line gated ring tone signals each having a frequency at the upper end of the voiceband frequency range, said ON HOOK digital voiceband signals and said first information signals and for receiving from said power line said second telephone signals, said base unit including:
(a) first detecting means responsive to said ON HOOK/OFF HOOK status signals for determining when the telephone is ON HOOK and when the telephone is OFF HOOK,
(b) a first information path responsive to said first detecting means for passing said ON HOOK digital voiceband signals to said power line when the telephone is ON HOOK, and
(c) means for generating a gated ring tone signal having a frequency at the upper end of the voiceband frequency range for each of said ring signals; and
an extension unit connected between said power line and the telephone for receiving from said power line said gated ring tone signals, said ON HOOK digital voiceband signals and said first information signals and for conducting to said power line said second telephone signals, said extension unit adapted for connection to an indicator which indicates said selected information of said ON HOOK digital voiceband signals and including:
(a) second detecting means responsive to said ON HOOK/OFF HOOK status signals for determining when the telephone is ON HOOK and when the telephone is OFF HOOK, and
(b) a second information path responsive to said second detecting means for passing said ON HOOK digital voiceband signals to the indicator when the telephone is ON HOOK.

### Claim 7 (depends on 6)

A power line telephone communications system according to claim 6 wherein:
(a) said gated ring tone signals and said first information signals pass to said power line through said first information path,
(b) said first detecting means activate said first information path when:
(1) the telephone is ON HOOK to pass said gated ring tone signals to said power line, and
(2) the telephone is OFF HOOK to pass said first information signals to said power line, and
(c) said second detecting means activate said second information path when:
(1) the telephone is ON HOOK to pass said gated ring tone signals to the telephone, and
(2) the telephone is OFF HOOK to pass said first information signals to the telephone.

### Claim 8 (depends on 7)

A power line telephone communications system according to claim 7 wherein:
(a) said extension unit further includes a third information path responsive to said second detecting means through which said second telephone signals pass to said power line,
(b) said second detecting means activate said third information path when:
(1) the telephone is ON HOOK to pass said ON HOOK/OFF HOOK status signals to said power line,
(2) the telephone is OFF HOOK to pass said ON HOOK/OFF HOOK status signals to said power line, and
(3) the telephone is OFF HOOK to pass said second information signals to said power line,
(c) said base unit further includes a fourth information path responsive to said first detecting means through which said second telephone signals pass to the telephone line, and
(d) said first detecting means activate said fourth information path when:
(1) the telephone is ON HOOK to pass said ON HOOK/OFF HOOK status signals to the telephone line,
(2) the telephone is OFF HOOK to pass said ON HOOK/OFF HOOK status signals to the telephone line, and
(3) the telephone is OFF HOOK to pass said second information signals to the telephone line.

### Claim 9 (depends on 6)

A power line telephone communications system according to claim 6 wherein said ON HOOK digital voiceband signals occur between the first and the second ring signals.

### Claim 10 (depends on 9)

A power line telephone communications system according to claim 9 wherein the frequency of said gated ring tone signal is 3.5 KHz.