KR920002802B1 - A power line telephone extension - Google Patents

Abstract

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Description

Power Line Telephone Expansion System

1 is a diagram showing a general transmission / reception system for transmitting voice or other data signals over a normal AC power line.

2 shows waveforms A through D as examples of coding techniques.

3 is an electrical convex diagram of a typical multi-country full duplex system incorporating the features shown and described in FIGS.

4 is a perspective view of a power line carrier telephone expansion system having at least one extension telephone and a main telephone according to the present invention;

5 is an electrical block diagram showing the principle electrical subsystem for the main telephone of the system.

6 is an electrical block diagram showing the principle electrical subsystem for one of the system's extension telephones.

7 to 11 are tables showing operation states of the main (M) and the extension (E ₁ , E ₂ ) telephone book systems.

12 is an electrical block diagram showing a main telephone power line combining circuit.

13 is an electrical block diagram showing an extension telephone power line coupling circuit.

14a, b, c, d and e are electrical details of the keypad of the main telephone.

15A, B and C are electrical details of the keypad of the extension telephone.

16 and 17 are electrical details of the extension address setting switch.

FIG. 18 is an electrical detail diagram of a double ton multiple frequency (DTMF) main and system generator.

* Explanation of symbols for main parts of the drawings

3: main telephone 12, 17: extension telephone

27: hybrid system 45: DC voltage regulator

46: Expansion sending / receiving computer 50-1, 50-2: Hook switch

54: address setting switch 206: compression circuit

208 transmitter computer 209 RF oscillation and modulation circuit

212, 213: power line combiner 216: RF demodulator

218: first amplifier 219: second amplifier

22C: RF Level Detection Circuit 22: Code Detection Circuit

223 receiver computer 224 band filter

225: expansion circuit 226: device for utilizing the audio signal

227: code byte utilization apparatus 33C: main transmission and reception computer

343: voice utilizing device 346: code utilizing device

The present invention relates to an apparatus for long distance signal signaling over a telephone line via an available AC power line. In particular, the present invention relates to a power line telephone extension system for communicating over an AC power line between a telephone line of a system and a telephone line of an ordinary telephone subscriber.

US Patent No. 3,949,17,2, issued April 6, 1976, entitled “Telephone Expansion System Using Power Line Carrier Signals”, assigned to the same assignee as the present application, is very identical to the system described in this application. A system for performing this is described. This patent covers a main (or master) station that combines a subscriber's telephone line with the subscriber's AC powerline, and a normal receptacle that plugs into the subscriber's AC powerline and sends a switching call in the usual manner. It also describes the special extension phone used to make or receive calls. In this patent, the extension telephone has a handset at one end and a handset at the other end, each having a separate line from each other. The line from the transmitter is fed to a radio frequency (RF) transmitter, and the line to the receiver comes from the RF receiver. The main station is provided with corresponding RF transmitters and RF receivers. This transmitter-receiver combination enables full dual-signal transmission of voice and other signals between the main station and the extension telephone over the AC power line.

The powerline RF carrier extension telephone system of patent 3,949,172 did not prevent interference due to RF signals (in the same RF frequency range) on AC power lines coming from other sources such as powerline carrier extension telephone systems of other telephone subscribers. It is an object of the present invention to provide an improved power line carrier telephone expansion system that protects against interference by RF signals from different sources on the same AC power line.

Further, the system of patent 3,949,172 does not prevent eavesdropping by others calling the same AC power line. It is another object of the present invention to protect against such eavesdropping.

Transmitting signals over AC power lines that are available for other purposes in addition to the normal telephone use between the telephone line of a typical subscriber and various transmitting-receiving devices is referred to as the United States of America, entitled "Power Line Carrier Signals and Long Distance Signals to Used Telephone Lines." Patent 4,058,678, assigned to the same assignee as the present application. It also describes a system that allows electrical appliances or other electrical equipment on an AC power line in the premises to be controlled by telephone calls reaching the premises. This reached telephone call sends a control signal to the premises, which is carried by the RF carrier over the power line to the place where the electrical appliance is located to switch the electrical appliance on or off.

The patent also describes a system for sending alerts from the premises. For example, a fire detector in a premises connected to a power line sends an RF alert signal to the telephone via the power line, where it initiates a telephone operation calling a predetermined number to deliver a pre-recorded message. Obviously, other RF signals from other sources on the same power line may interfere with the intended signal or result in an error response or unintended response in an electrical appliance. These disturbance signals can be generated by chance or by deliberate mischief by others on the same power line. In either case, interference from these disturbances should be avoided and such pranks should be as frustrated as possible. It is another object of the present invention to provide a signal transmission technique via an AC power line which prevents such interference.

It is a further object of the present invention to provide an improved method and means for transmitting voice and data signals over a conventional AC power line in the premises of a telephone subscriber to avoid interference and interference caused by signals from other sources on the same power line. To provide.

The power line RF carrier extension telephone system of Patent No. 3,949,172 describes a single extension telephone connected to an AC power line at a main (or master) station and a power line receptacle.

The system can accommodate more than one extension telephone, and the main station can answer one of the extension telephones if all extension telephones are transmitted on the same extension RF carrier frequency. However, only a single receiver of the main station can simultaneously respond to only one extended carrier. Certain embodiments described herein can all operate simultaneously and have full duplex communication with each other and with telephone lines that make telephone calls received by any telephone in the system and all initiate a telephone line call hold. It provides a power line carrier telephone expansion system that includes several extension telephones.

It is yet another object of the present invention to provide a means for a multiple extension telephone system as described in a particular embodiment to allow all extension telephones to initiate a telephone line call hold.

In connection with the above objects, another object of the present invention is to provide a secure communication system in which the system signal is coded to distinguish this system signal and the analog signal accompanying the signal from the disturbing signal.

It is a further object of the present invention to allow system signals to initiate a telephone line call hold and communicate with each other via the two element internal premises transmission lines between the system telephone and other functional units such as the I, P and S functions. It is to provide an internal multi-telephony expansion system for telephone subscribers.

Two or more such systems are preferably installed in the premises to integrate them into a single main station. It is therefore a further object of the present invention to provide a technique for integrating a system such that the satellite stations of both systems can be operated simultaneously.

It is a further object of the present invention to provide a technique for integrating or combining the control mechanisms or alarm systems with each other and with several instrument reading systems such that a single main station serves all systems by telephone line.

Another object of the present invention is that both can operate simultaneously and can perform full duplex communication (Intercom) with each other without proceeding to the telephone line, but at the same time any of the system telephones not used for such intercom communication are telephone lines. It is to provide a power line carrier expansion system with several extension telephones to accept calls from.

It is a further object of the present invention to provide a means for signaling to a system telephone while it is used in intercom communication to accept an external telephone call so that any or all of the system telephones can answer an external call.

A further object of the present invention is a telephone which can utilize intercommunication between the intercom and system telephones and can also use other functional units such as hold, private and special functions via the two internal internal transmission lines laid between the telephones of the system. It is to provide a subscriber multi-telephone expansion system.

Industrial Applicability The present invention can be applied to simplex or duplex communication between remote transmission and reception (TX-RX) devices via available power lines in a premises or internal premises transmission lines of two elements. Such communication signals are processed before transmission to remove or block reception disturbances and mischief signals from other sources upon reception. The remote TX-RX device may be a utility instrument specifically equipped to respond to a search signal from the telephone line by transmitting a telephone or data link modem or instrument data signal backwards. In a preferred embodiment of the present invention, the system transmits voice or other data over an AC power line by a modulated RF carrier.

The preferred embodiment described in detail herein is for use with a conventional telephone line in a subscriber's premises, which is intended for simultaneous transmission of voice and data signals in both directions between several extension telephones in the system and the subscriber's telephone line. It is a telephone system using available AC power lines.

In this embodiment, the extension telephone of the system is connected to a conventional AC power line receptacle in the premises. Thus, the telephone expansion system is particularly sensitive to RF signals from other sources on the same power line. For example, an AC power main station serves a number of premises, and only the barriers to RF signals on the main station placed between the main station and the power line lines in the premises may be electrical meters in the premises. This barrier is usually no greater than the barrier inside the premises, such as on either side of the premises power line. Thus, RF sent to the AC power line probably flows to the main line and into the power line in the neighboring premises, disrupting the power line communication system in the neighboring premises. The opposite situation also occurs.

It is a particular object of the present invention to provide a telephone extension system which includes several extension telephones which communicate via a power line normally available in the premises of the telephone subscriber and which also enables all ordinary telephone use.

It is a further object of the present invention to provide a conventional telephone line in the premises of a telephone subscriber with a private system that is in communication with the telephone line via available power lines in the premises and which is free of power line interference.

It is a further object of the present invention to provide a subscriber terminal data link, or modem, which is a private system for communicating with a telephone line over an available powerline in the premises for a conventional telephone line.

In connection with the above objects, another object of the present invention is to provide a safety communication system which is coded so that the system signal can be distinguished from the interference signal and this code can be easily set by the user.

Other objects, features, and advantages of the present invention will become more apparent from the following description of specific embodiments to illustrate the most widely known use of the present invention and to be described with reference to the drawings.

1 illustrates a general transmission / reception system for transmitting a voice or other data signal over a typical AC power line in a place such as a general residential area, where the system encodes a signal to receive a received code signal from a received signal and interference. It is combined with means for easy identification of disturbance signals.

2 shows an example of an encoding technique with waveforms A through D.

FIG. 3 is for transmitting voice or other data signals over a typical AC power line, such as in a general residential area. Electrical diagram showing a typical multi-country full duplex system incorporating the features shown and described with reference to FIGS. It is a block diagram.

4 illustrates the features of the present invention and communicates with interline and telephone lines via AC power lines to provide facilities for intercom (I), hold (H), private (P) and special (S) operations in addition to all normal telephone operations. A perspective view of a power line carrier telephone expansion system with one or more extension telephones with water and a main telephone.

5 is an electrical block diagram showing the principle electrical subsystem for the main telephone of the system.

6 is an electrical block diagram showing the principle electrical subsystem for one of the system's extension telephones.

7 to 11 show communication in telephone line (TL) mode, main (M) and extension (E ₁ , E ₂ ) telephones in intercom (I) mode; Placing the TL call on hold H; Assigning a private P between two phones in I mode or between a phone and a TL; Main (M) and expansion (E ₁ , E) for several functions and routines, including the use of special (S) functions for automatic redialing of the last dialed number and automatic dialing from a list of memorized phone numbers. ₂ ) This table shows the operation status of the telephone sub system. Specifically, in this figure, FIG. 7 responds to a call from TL by E ₁ or E ₂ ; Placing the call in TL by E ₁ or E ₂ ; Show the interaction between E ₁ , E _2, and M when calling TL.

9 shows the H mode of TL while M and E ₁ or E ₂ are in I mode; Shows the H mode of TL while E ₁ and E ₂ are in I mode.

10 shows P between M and TL; P between ME ₁ -E ₂ and TL; P between E ₁ -E ₂ and TL and P between M and TL while E ₁ -E ₂ is in I mode.

Figure 11 shows the S-last number redial used by M, the S-dial memory number used by M, the S-last number redial used by E ₁ or E ₂ , and the use of E ₁ or E ₂ Shows the recorded S-dial memory number.

12 shows a main telephone coupling circuit for connecting the main telephone to the power line.

FIG. 13 is an electrical diagram showing the extension telephone power line coupling circuit for connecting the extension telephone to the AC power line.

14A, 14B, 14C, 14D and 14E are electrical details of the keypad of the main telephone.

15A, 15B and 15C are electrical details of the keypad of the extension telephone.

16 and 17 are electrical details of the extension address setting switch in the main telephone and the extension telephone, respectively.

18 is an electrical detail diagram of a dual (dial) ton multi-frequency (DTMF) main and system generator in the main telephone.

The present invention relates to RF on a power line, whether or not a particular interference disturbance signal originates from a neighboring power line carrier extension system or from a mischievous signal deliberately infiltrated (added) to an AC power line to interfere with another source, the user's power line carrier line extension system Although it has been used in power line carrier telephone expansion systems to reduce the effects of interference disturbing signals, the techniques applied in certain embodiments described herein may be usefully applied to any transmission line system, local network system, or other power line carrier systems. Should be understood. For this general application, general embodiments of the present invention are described herein.

Short two stations system

First, Figure 1 illustrates the simplest case of a power line transmission and reception (TX-RX) system that transmits a short signal from one station on an AC power line in the premises to another station on the AC power line (or on any two element internal premises transmission lines). The block diagram is shown. As can be seen from FIG. 1, the first station, i.e., the transmitting station 201, generates an analog signal and a digital signal including, for example, an address byte, a code byte, and a checksum byte, and synthesizes the CODE signal with the analog signal. This synthesized signal is then transmitted as data by the RE carrier via the AC power line 202 in the premises. The other station, i.e., the receiving station 203, first detects the RF carrier and then demodulates the received signal, and then detects and checks the code signal, depending on whether the following conditions (a) to (d) are satisfied: And the analog part of the signal to the utilization device.

(a) The RF power level of the detected carrier is a predetermined minimum value.

(b) In the CODE signal, the address and the code byte coincide with the checksum byte.

(c) The address byte satisfies the stored address at the receiver.

(d) The code byte matches one of the codes stored at the receiver.

Figure 2 shows a series of waveforms A through D illustrating one technique for blocking unwanted crosstalk signals by coding the transmitted data. In FIG. 2, waveform A shows a transmission interval called TX interval indicated at the transmitting station 201. Waveform B shows a complete signal interval called T × DATA interval within the TX interval. T × DATA contains an analog voice signal called VOICE followed by a code message called CODE. T × DATA starts with a special CODE signal for several milliseconds.

TX and T × DATA Normal or “resting” off states are high when the transmitter is off. The transmitters 201 and TX are instructed to send a TxDATA message when the CODE message from the transmitter (TX) computer 208 goes low and stays there for 5 milliseconds (5 ms). This tells the transmitter that a voice message, VOICE, is coming from the signal source 204. After this 5ms interval, the transmitter rises to a high state for about 5ms and then the falling section starts the first bit of CODE called CODE CELL.

For example, suppose that the RF carrier frequency is 120 KHz and the CELL is 156 cycles long. Waveform C shows waveform D with extended time, and waveform D shows CELL with waveform C with extended time. CODE CELL width is 1.3ms. In this case, let us assume that the pulse width of each cell is 33% / 66% demodulated as shown in waveform D, which gives a minimum pulse width of 0.43 ms.

Assuming that the CODE protocol, i.e., the address byte, the code byte, and the checksum byte are each 8 CELL long, the unused CELL of the address will be zero in this protocol. The checksum seed is zero. Thus, all three bytes add up to zero ignoring carry. This gives the CODE message length of (24 x 1.3) + 5 milliseconds = 37 milliseconds at the beginning of the VOICE message.

In the receivers 203 and RX, the filter 214 filters, the RF level detection circuit 220 performs carrier threshold detection, the RF demodulator 216 demodulates, and filters the filter 217. The CODE will be in the same form as it was sent ready for inspection. This means that the polarity of the impulse of the CODE is the same as that sent. Receiver 203 continuously monitors the reception of the RF carrier, generating a high signal similar to the high level shown by waveform B in the absence of a carrier. The receiver program indicates, from its monitor, that there is a system band pass RF carrier at a predetermined minimum power level in response to the low level, which immediately switches to the receiving routine. The receiving routine recognizes all rising edges of the demodulated RF carrier starting at the beginning of the CODE message.

First, it integrates 33% to 66% of each received CODE CELL width and determines if CELL is a binary one factor of zero. If the integration level for CELL is high, CELL is 0, and if it is low, CELL is 1.

The CELL width of 1.3ms and the integration over 0.43ms of this width are suitable for removing any kind of RF noise that may come from outside the premises as well as the user's premises, and are typically It is produced by a dimmer with a silicon controlled rectifier (SCR) as a controllable variable element, since this SCR generates impulses at 8.33 ms intervals for a duration of a few microseconds. The receiver has a high noise margin for noise resulting from this SCR, because the CELL integral action is much slower than the SCR impulse duration, and the integration is done over an interval (0.43 ms) much longer than the impulse interval, This is because the spacing between them is much longer than the CELL width. The received VOICE portion of DATA does not interfere with CODE due to the lower modulation level of VOICE.

Returning to FIG. 1, the transmitting station 201 improves transmission by compressing the amplitude level of the signal source 204, which may be analog voice or other data, and the signal source having advantages in a frequency modulated carrier transmission system. Equipped with 206. In the summation circuit 207 the CODE is added to the output of the compressor 206 so that VOICE and CODE are combined as shown in waveform B of FIG. 2 to form T × DATA. As mentioned above, the CODE may be, for example, the 3-byte code shown in Waveform 2, C, and includes an address byte, a code byte, and a checksum byte, each 8 bits long and occupying a total T × DATA message of 37 ms. . This message is provided to the demodulated carrier that is supplied to the transmitter's RF oscillator and modulator 209 via a switch 210 controlled by the transmitting (TX) computer 208 to the power amplifier 211 of the transmitter.

With this switch 210 the TX computer turns the transmitters 201 and TX on and off in accordance with certain criteria met by the signal from the signal source. The output from the transmitter shown on line 211a from power amplifier 211 is supplied to premises AC power line 202 via transmitter power line combiner 212. This coupler 212 acts as a filter-directional coupler and includes an absorbing load that protects the transmitter from RF from the power line.

At the receiving station 203, the RF from the transmitter is coupled from the power line 202 by a combiner 213 to receive a receiver 230, RX, limiter with an input filter 214 (which may be a band pass filter, for example). 215 and RF demodulator 216 in turn. The output of the demodulator 216, called RxDATA, is fed to an audio amplifier 218, 219 in two stages via an output filter 217 (e.g., may be a low pass filter) and then switched from the second stage. It is supplied to the expander 225 via 224, giving a receiver output to the line 225a. From the output of the second audio amplifying stage 219, the code detection circuit 222 adjusts the pulse level of the R × CODE portion of the R × DATA so that the received R × DATA is suitable to be supplied to the receiver (RX) computer 223. Is compared with the reference signal level. On the other hand, the RF received at the bandpass input filter 214 is processed by the carrier level detection circuit and the switching amplifier 220 to generate an on / off signal of a carrier state suitable for the RX computer 223. A similar signal from the carrier level detection circuit 220, that is, a squelch signal, is supplied to the code detection circuit 222 to squelch its output when the RF carrier state level is off. Thus, the receiver up to this point cuts off the received carrier power level and squelches some detection CODE if the RF level criteria are not met.

The RF computer 223 is programmed to perform a check on the received message RxCODE including the address byte, code byte and checksum byte.

The computer integrates 33% to 66% of each CODE CELL to determine whether the CELL is 0 or 1. It then adds the address, code, and checksum bytes (without rounding), an enable signal if the sum is zero, and a disable signal that switches the switch 224 off if it is nonzero. Serve In addition to this, the receiver computer checks the contents of the address byte and the contents of the code byte and compares it with a preset number of computers. If they are both compared, i. E. Match, the disable-enable signal at switch 224 does not change. However, if they are not compared and the signal to the amplifier is enabled, the signal is switched to disable. In this way, the computer checks the received addresses and codes as they are sent to confirm that they have been received and then correlates them with the stored addresses and code numbers, and if both checks and correlations are satisfied, RxDATA expands through the switch 224. The circuit 225 is then supplied to the voice signal utilization device 226. At the same time (or instead) the correlated code byte may cause the computer to send an initialization signal to the code byte utilization device 227.

All signals from the output of the second audio amplifier stage 219 are supplied to the extension circuit 225 to give a receiver output to the signal utilization device 226. The function of the expander 225 is to return the received VOICE signal to the full dynamic range to compensate for the compression done at the transmitter. The switch 224 and the expander 225 may include a summation circuit (not shown) for adding any other suitable signal or tonal to the VOICE signal, taking into account the overall use and functionality of the system.

These tones and signals are selected in accordance with the code bytes of the signal received or stored in the RX computer. Adding signals in this manner is a function of the RX computer, i.e., the powerline carrier telephone expansion system, within certain embodiments of the present invention described in detail herein.

Full duplex multi-country system

The general signal transmission technique described with reference to FIGS. 1 and 2 is particularly applicable in systems in residential areas, such as in residential areas, which signal via an available AC power line, as mentioned above, so that the system is the same power line. It is desirable to block interference signals that may originate from neighboring premises on the floor. The technique described here is applicable to multi-station systems in the premises capable of simultaneous full-duplex signal transmission between all stations of the system, so that countries can transmit transmitters in accordance with the techniques shown and described with reference to the transmitters and receivers and FIGs. And a computer having an initially set program for encoding, decoding and controlling the receiver. Such a full duplex multi-station (two or more) system is shown in FIG. The transmitter and receiver of FIG. 3 may be configured and operated in the same manner as the transmitters 201, TX and receivers 203, RX of FIG. 1, in which case reference is made thereto without further explanation. The station computer of FIG. 3 is referred to as a TX-RX computer, which means that it performs all the functions of the TX computer 208 and RX computer 223 of FIG. 1 for the associated transmitter and receiver. This is the case for all TX-RX computers except the main TX-RX computer for the main station, which will be described later.

Referring to FIG. 3, a typical power main 301 is shown, including three phase leads, the center lead 302, the power lines 303, 304 that are phase 1 (? 1) and phase 2 (? 2). . These phases are 180 ° apart, for example, and the RMS voltage from one phase in the center lead 302 is 120 volts at 60 Hz, so the RMS voltage from phase 1 to phase 2 is 240 volts at 50 Hz.

From the power main 301, three lead lines 305 are connected to the premises and are connected to the premises AC power lines, indicated by the power lines 202 (also like FIG. 1), via the premises power meter 306. For illustrative purposes, the power line 202 is represented by three conductors, namely, a center conductor 202N, a phase 1 conductor 202 ø1 and a phase 2 conductor 202 ø2. Within the premises are six satellite stations, called I, II, III, IV, V and main (M) stations, all of which are coupled to one phase or another phase lead of the premises AC power line. Stations I through V are denoted by 311 and M stations are denoted by 316.

Stations I to V may all be the same except for the carrier frequencies, each transmitting, referred to herein as RF carrier frequencies or channels F ₁ to F ₅ , respectively. Therefore, only the station I indicated by the satellite station 311 will be described in detail. Station I includes a transmitter (same as transmitters 201, TX) and a receiver (same as 203, RX in FIG. 1), so the transmitter and receiver in that station use the same reference numerals as in FIG. The transmitter and receiver perform all the functions of, and are controlled by, the computer controlling and controlling the TX computer 208 and RX computer 223 of FIG. 1, so that the computer of that station is referred to as a TX-RX computer. And marked (208/223). The source signal and utilization device of station I are the same as the signal source 204 and utilization device 226 in FIG. The combiner 307 from station I to AC power line 202 combines RF from the transmitter to the power line, and combines RF from the power line to the receiver, from the line of the station's transmitter, receiver and computer power source (not shown). Draws power. The configuration of this coupler 307 is described with reference to a specific embodiment, in particular the power line telephone expansion system with reference to FIG.

Each of the different I to V stations is substantially identical to the TX-RF combination in station I, except that they each transmit different carrier frequencies. For example, station I transmits carrier frequency F ₁ , station II transmits carrier frequency F ₂ , and the remaining stations transmit each carrier frequency in the same manner.

All of these stations receive the same carrier frequency Fm from the main station at 316. Therefore, only the differences between stations I and V will be what they transmit on the other channel. Otherwise, the stations all send signals from their station sources and all use signals from their station's utilization devices, and transmission and reception between all stations are full duplex. Obviously, for any station, any of these features may be omitted and the transmission and reception at any station may be short-lived or only one station may be transmitted or only transmitted, depending on the purpose of the overall system.

In the main station 316, the transmitters 201 and TX that transmit at the carrier frequency Fm do not transmit a signal generated by the main station, so that the switch 205 controls the signal to the compressor 206. It may be substantially the same as the transmitters in stations I to V and transmitters 201 and TX in FIG. 1, except that they are not switches such as < RTI ID = 0.0 > The function of the main transmitter is also to relay data received from any transmitter of another station in the system to the receiver at all (or some) other stations in the system. Therefore, transmissions from stations I to V are all received at the main station 316 by individual channel receivers 321 to 325, and all received data is synthesized as soon as the main station transmitters 201 and TX are synthesized. From all stations. Therefore, the input of the transmitters 201 and TX adds some signal generated from the main source 326 at the main station to the combined outputs of the receivers 321 to 325. The output of the main transmitter 201, TX is coupled to the power line 202 by a main power line combiner 327. The configuration of this coupler is described with reference to a specific embodiment, namely the power line telephone expansion system shown in FIG.

Each channel receiver in the main station 316 is configured and operates substantially like that of the receivers 203 and RX described above with reference to FIG. Accordingly, each of the receivers 321 to 325 has a band pass input filter 214, a limiter 215, a demodulator 216, a low pass filter 217, a first audio amplifying stage 218, and a second audio amplifying stage ( 219, the CODE detection circuit 222 and the carrier level detection circuit 220 sketching the CODE detection circuit output to the RX computer when the received RF carrier power level drops below a predetermined level and supplying an RF carrier status signal to the RF computer. Equipped) The CODE and RF state control lines from these receivers 321 to 325 to the main TX-RX computer are the same as the control lines from the receivers 203 and RX to the RX computer 223, see FIG. It carries a control signal that does just that.

In either of the receivers 321-325, when the received RF output level is satisfactorily compared with the reference level, the detected R × CODE is supplied to the main TX-RX computer 330 via the circuit. In the main computer this T × CODE is correlated with the stored signal, and if it is correlated with the stored signal, the computer immediately causes the corresponding receiver to be enabled at the receiver output switch 331 by the enabling signal. This switch supplies the receiver output to a summation circuit 340 that sums the switch outputs of all receivers 321 to 325 as the output of the switch is controlled by the computer. The output of the summation circuit 340 is amplified by the audio amplifier 341 and supplied to the decompression circuit 342 having the same function as the decompression circuit 225 of FIG.

The main TX-RX computer 330 performs all the same functions in response to all the same inputs, and also controls as the TX and RX computers 208 and 223 of FIG. It performs this function for the main transmitters 201, TX and all channel receivers in the main station, and stores a predetermined data signal, which may be other tones, numbers, voices or codes, and the main transmitters 201, TX. In the summing circuit 207 to the transmission system for stations I to V, or depending on the signal supplied to the computer starting from the main source 326 at the main station and across the line 326a, or Depending on the code signal received from the other five stations will be supplied to the main station VOICE utilization device 343 through the line 343a or to the main station CODE utilization device 346 through the line 346a. Or at the same time (or instead) the correlated code byte causes the computer to send an initialization signal to the code byte utilization device 346.

In the main station, the channel VOICE signal received from the decompression circuit 342 is supplied to the main transmitters 201 and TX via the summation circuit 344 and the transmitter input amplifier 345. The purpose of the summation circuit 344 is to synthesize this VOICE signal from the main source 326 of the main station with the received signal for transmission to the other five stations.

The powerline carrier systems of FIGS. 1 and 3 are exemplified here as general systems because they teach signal transmission techniques that can be used for any of a variety of other special applications. FIG. 1 describes and describes a unidirectional signal transmission system of a short-term scheme including two stations, namely, a station only transmitting and a station only receiving. On the other hand, Figure 3 describes a system comprising a plurality of stations transmitting and receiving in full duplex, where all stations can communicate with each other and all or selected stations among other stations according to the address of the CODE accompanying the signal. The signal memorized in the main station computer is sent out for transmission. The common technique integrated in both embodiments is that the same power mains 301 are on the same power main transformer 301a side as the interference disturbance signal from the premises where the system is used or outside of the premises, for example the premises in question. It includes technology to block the received signal to remove this interference signal, whether it is from a neighboring premises connected to the This blocking action is described in detail with reference to the operation of the FIG. 1 system and also applies to FIG.

If the main station 301 provides two phases as shown in FIG. 3, any of the electrical outlets (receptacles) in the premises will be powered by one phase since the premises taking power from the mains will take power from both phases. Will be called, and the different electrical outlets will call different phase power. Thus, in the premises, some of the stations are plugged into power lines of one phase and other stations are plugged into power lines of another phase.

Stations plugged in the same phase will have a relatively low attenuation transmission path between them, while other stations plugged in different phases will have a relatively high attenuation path between them. Blocking by the code and address and checksum signals described herein can eliminate interference disturbances in the receiver band from neighboring premises.

Figure 4 illustrates a power line carrier telephone expansion system with three telephones in one telephone line company, often called a 1x3 telephone system. The system provides conventional telephone service, which may be a rotary dial or touch tow, at several locations along the AC power line available at the telephone subscriber's premises. Other uses include sending and receiving voice, data, alarm or control signals by RF carriers over common AC power lines for any purpose, including all the purposes mentioned in this application.

As shown in Fig. 4, the subscriber's premises are usually made up of four wires (not shown), called the fourth line for the tip line, ring (ring) line, ground and special line partial ring circuits (not shown). Has 1) The ring line is usually red, the leading line is green, the ground is black, and the fourth line is yellow. Typically, these thin lines of tip, ring and ground are connected to a conventional "online" telephone in the premises and also to the jack 2 on the wall of the telephone line.

In a typical telephone system in the subscriber's premises, the extension telephone is connected to the telephone line 1 at the wall jack 2 by simply plugging in and any such extension telephone acts on the incoming telephone call to make a telephone call. It can be left on the track. The system described herein provides the same service and other features, referred to as intercom (I), hold (H), private (P) and special (S), which are described in more detail later. This is all because the extension telephones of the system can be used for any available AC power receptacle on the premises, so its use is not limited to where a telephone line wall jack is provided.

In FIG. 4, the passage to the subscriber telephone line 1 is in the jack of the telephone wall. The main (M) telephone 3 of the system is connected to the jack 2 by a conventional (modular) telephone plug 4 at the end of the line 4a and at the same time an AC power adapter plug at the end of the power cord 6a. (6) to the neighboring AC power line outlet (5). Through this connection, the subscriber switching line 1 is connected to the subscriber's AC power line, generally indicated by the sign 10. Any of the other AC power outlets (receptacles) on the subscriber AC power line 10 may be extended telephones in the system. For example, at 11, extension E ₁ telephone 12 is connected to power line 10 by AC power adapter plug 15 via power cord 15a. Similarly at another power outlet 16, system extension E ₂ transition 17 is connected to power line 10 by an AC power adapter plug 20. The system extension telephones E ₁ and E ₂ (12) and (17) are configurable and operational, with the exception of the specific RF carrier frequency F ₁ or F ₂ and address signals respectively set in relation to the setting of a similar main telephone 3. Is the same in.

In operation, the incoming telephone call ring signal of the telephone line 1 is processed through the main M telephone 3 to transmit an understanding ring signal through the power line 10 to the main RF carrier frequency Fm (channel m). , It is received and ringed by the system E ₁ and E ₂ phones 12, 17. These incoming calls can be answered by any of the system phones or they all interact with the incoming calls at the same time and communicate with each other. Thus, the incoming calling device and all system telephones can communicate with each other. In addition, the incoming call does not end at the subscriber's location until all system calls are hooked on. In addition, the telephone can be placed on the system track by a telephone that goes off hook using the telephone keypad (button) and signals the calling number, just as any conventional telephone makes a call. And before, during, or after this signal transmission, other phones in the system can go off-hook to join the call. Thus, the normal operation of the system illustrated in FIG. 4 is the same as a conventional extension telephone operation, while also having the additional features and advantages that a system extension telephone can be installed in the premises at any conventional AC power outlet.

Main (M) telephone circuit

5 shows a complete electrical block diagram of the main telephone circuit system. Some blocks of the subsystem shown in FIG. 5 are shown in more detail in the drawings of FIG. 1, which are also represented by blocks. Some parts of this subsystem are shown in more than one detailed drawing. This will make the drawings more systematic. The same parts are denoted by the same reference numerals in any of the figures.

All signals transmitted between the system main (M) telephone and the extension (E ₁ , E ₂ ) telephones are transmitted by RF carriers Fm, F ₁ or F ₂ to call the system signals. Transmission of the system signal indicates transmission TxDATA and RxDATA.

The main telephone 3 circuit comprises a telephone line interface subsystem 21 which is directly connected to the subscriber telephone line 1 via a plug 4 and a jack 2.

Interface 21 includes telephone line circuitry 22, which is a multi-port directional coupler similar to the circuitry used in conventional telephones. The interface 21 also provides occupancy impedance across the telephone line and directs or outflows of voice signals between the system and the telephone line directly.

It also switches the signal between the main M and the expansions E ₁ , E ₂ depending on the position of the main telephone hook switch. In particular, the interface 21 connects the main telephone signal driver driving circuit 24 directly from the telephone line, and also connects the subsystem 25 of the main transmitter from the telephone line, a multi-port system network 27 referred to here as a hybrid system. (Or directional coupler) to connect the main receiver (MRX, 26).

The MTX 25 in turn supplies the beep, voice and data (voice) and code system signals to the AC power line 10 via the main power line combiner circuit 28.

The ports of the telephone line network 22 are the input ports M Mic / Dl and the output ports MEp connected to the telephone lines via the diode bridge 21a and the SS relay switch 33.

The hybrid 27 part is an input / output port TL connected to a telephone line via an input port MRXN (line 26), an output port NTX and a C relay switch 34 connected to an input of a transmitter.

As mentioned above, the signal driver circuit 24 responds to the ringing signal on the telephone line and obtains all the power of the circuit for responding to this signal from the telephone line. In response to the ring signal, the signal circuit 24 drives the main telephone transmitter (ring speaker) 30 via the speaker transformer 30a. The main speaker 30 is also absent by the intercom signal from the main transmit / receive (TX-RX) computer 31 when the computer decodes the intercom signal from one of the extension telephones in the system. This intercom signal from the voltage regulator 32 and the power supply voltage bias the speaker to generate an audible sound, such as a bus, through the drive circuit 24.

The main power line combiner circuit 28 is a reactive circuit, which in reality is a transformer. However, this coupler circuit 28 between the AC power line and the telephone line should be able to be soluble as well as inductive. The MTX unit system 26 receives the RF carrier signal from the power line coupler 28 originating from the extension (E ₁ , E ₂ ) phone of the system, which received signal passes the test for the RF power level and The cord is fed by the line 26a past the directional coupler 27 and into the charge line 1 of the interface 21. If a signal that can be received in the system originates from one of the system's extension telephones, this signal is a command or status signal. These signals include code bytes and are precise code signals similar to the extended hook signal and keypad signal. These signals are supplied from the receiver 26 to the main transmit / receive (TX-RX) computer subsystem 31 to initiate specific operations in the main phone, which will be described in more detail below.

The main TX-RX computer 31 processes all system signals between the main and extension telephones. In particular, the main TX-RX computer 31 processes all start and end signals from the telephone line including the ringing signal, processes all signals from the extension telephones of the system, and the main telephone generated from the hook switch 23. Process the hook switch signal, process all signals from the main keypad 32, control the subsidiary (SS) relay switch 35 (all switches in the telephone line interface), turn on the main transmitter 25 and It turns off, adds the code to the analog voice sent by the main transmitter and controls the dual voice multi-frequency (DTMF) generator 36 of the system by the coded keypad signal received from the main phone to the extension phone.

In this process, the main computer performs a logic function as all code signals received from the extension telephone as described above with reference to Figs. And this main computer also adds a code to every signal transmitted by the main transmitter, if the code accompanying the received signal does not meet the predetermined criteria programmed in the main computer, even if it is the RF carrier frequency F ₁ or F _{Even at 2} or even if the received RF power level is met, the received signal will not be detectable.

Expansion telephone circuit

The extension telephones E ₁ and E ₂ circuits are shown in FIG. This circuit includes an extension having the same function as the main power line coupler 28. All signals (called system signals) transmitted by the main transmitter 25 are supplied via the combiner 28 via the AC power line 10 and supplied to the enlarged receiver 42 via the enlarged power line combiner 41. . The first signal portion transmitted by the main transmitter is a code comprising an address byte and a code byte. For example, when the hook switch of the extension telephone is turned on, the first signal may be a telephone line ringing signal. These ringing signals are simple address bytes, code bytes, and bytes to be checked by the code detection circuit 222 at the extension receiver 42, and the code detection circuit 222 is detected by the extension TX-RX computer 46. The old code. If this code is logically tested on a computer, the computer drives the transmitter (ring speaker) 48 via transformer 48a to turn on signal drive circuit 47, which causes the extension phone to ring.

Therefore, the signal received first at the expansion receiver 42, i.e., a ringing signal received while the hook switches of all the system telephones are turned on is processed by the expansion computer, which turns on the expansion signal circuit 47, and the expansion signal The circuit 47 drives the speaker 48 which generates an audible sound. When the extension telephone is answered by lifting its handset 49, the extension hook switch 50 generates an off hook signal supplied to the computer 46. In response to this signal, the computer turns on the extension transmitter which transmits the extension off hook code signal generated by the computer to the power line 10 and the main telephone receiver via the combiner 41. Accordingly, the extension off hook code in the main telephone is detected and processed, and both the SS and the carrier C relays 33 and 34 (as shown in FIG. 5) operate a telephone line loop for the extension. By closing, the main transmitter is turned on again to generate another main telephone line T × DATA phase consisting of a code carried by the signal on the telephone line. The telephone line signal is transmitted to the main transmitter 25 via the relays 33 and 34 and the hybrid 27. All these signals are received at the extension receiver 42 and processed by the extension computer 46 and this telephone line signal is supplied to the extension receiver 51. On the other hand, the audible signal from the extension telephone handset 52 is supplied to the extension transmitter to which the code from the extension computer 46 is added to generate another extension handset T × DATA phase.

All of the signals described above may occur during the main phone on-hook or as described after the main and other extension phones are off hook after the extension of the conversation. Thus, all audible signals from the handset for all telephones in the off hook-in system are fed to the telephone line so that all telephone line signals are sent to the handset for all telephones in the off-hook system.

The main and extension telephone circuits shown in FIGS. 5 and 6 are for the most symmetrical with respect to each other. For example, notice the following:

As shown from the detailed description of these circuits, some of these main subsystem circuits should also be interchangeable.

For example, power line couplers 28 and 41 must be identical.

With normal telephone function

The main and extension telephones in the system perform all of the functions of a conventional single line telephone even in the current used by the subscriber as one or more extension telephones. In other words,

(1) An external call is made by a telephone.

(2) Received a false call by a telephone.

(3) Intercommunication by external call between any and all telephones.

(4) An external call is held while either telephone receiver is off hook (in the telephone line (TL) mode).

In addition, while an external call is held, either or both of the extension telephones are moved unplugged from the power line and plugged again without ending the next external call. An external call can only be terminated by one system phone while plugged in on hook, and not plugged in while another phone in the system is already on hook. This feature is unique to the system indicating whether the system includes intercom (I), hold (H), private (P) or specific (S) functions.

With addition telephone function

The main and extension telephone computer circuits 31 and 46 shown in the electrical block diagrams of FIGS. 5 and 6 have already been shown in response to the signal input of the computer to retrieve the conventional telephone functions described above. Perform all logic processing, checks and controls described with reference. Hold (H), intercom (I), private (P), and specific (S) addition telephone functions, which will be described below, can be added to this implementation. In performing this addition function, the computer stores many values and coefficients preset to it and generates code, control and alarm paths as described in more detail below. In particular, such a computer is as described above in connection with both the general embodiment of the invention shown in FIGS. 1 through 3 and the particular embodiment shown by FIGS. Perform logic processing, inspection and storage of all signals. With reference to this general embodiment, here are the functions and stored values and coefficients performed by both the full multi-station and the TX computer and the RX computer 223 as described with respect to FIGS. Referring to the specific embodiments described and illustrated so far with respect to FIGS. 4 through 6, the code includes both multi-telephony execution (1 × 3 telephone systems), address bytes, code bytes, checksum bytes. In the coding scheme of all transmitted signals, and the shielding technique of the RF carrier detected by the first receiver for the RF power level, all the checked codes are actually the same as the general embodiment. Accordingly, the criteria in the following detailed description of the operation of a particular embodiment incorporating the addition functions of H, I, P, and S are sometimes made in the general embodiment, and everything described and illustrated herein is specific to the specific embodiment. Merged

Certain embodiments include addition functions already mentioned and identified. This addition function is actually achieved and provided for a particular embodiment both through the programming of the main computer 31 in the main telephone circuit and the programming of the extension computer 46 in each of the extension telephone circuits with very few exceptions, In particular, there are no addition electronic elements and sub-systems in the main and extension telephone circuits provided to supply this addition function. In order to perform this addition function (in addition to the normal function), the H, I, P and S functions are described below in order to understand its use and gain prior to describing the structure and operation of the main and extension systems. It is briefly explained.

Hold-H

Each phone in the system has a hold key, or button H, which operates in telephone line (TL) mode (not in I mode) if a particular phone is off hook when the hold button is pressed to hold an external call. Only one is provided in the system where the phone is off hook. Hold H is hawked off by the same phone making the external call and then off hooked, and then switches from I mode to TL mode by any phone in the system that is off hook. Hold H can also be reserved by any extension phone and is not plugged into the power line while an external call is scheduled. This non-plugging causes the hold button to be pressed immediately, leaving it on hook.

Intercom-I

Each phone in the system has an intercom button labeled I or I / TL that flips the phone between I and TL modes. In a typical system, the I button is always in TL or I mode. This exception in the extension phone does not go into TL mode and makes an external call while the main phone is in I mode.

If one of the system phones is in I mode performed by off hooking this phone, pressing the I button may cause another phone in the system to be signaled and called for I communication. This is done by a telephone that is off hook and in I mode its key presses ＂1＂, ＂2＂ or ＂0＂ on the pad.

Where "1" is to call the extension telephone E _1, "2" is to call the extension telephone ₂ E, "0" is to call a main phone (M). And pressing each button results in some Buzz on the phone called for I mode communication.

Also in this way some phones can intercom buzz itself.

Editorial-P

Each phone in the system has a private button on the keypad labeled P. Pressing this private button closes any other phone in the system that is on hook. In other words, it prevents the system's secondary phone from being the same mode (I or TL) phone initiated by P. If the closed phone is an extension phone, the system does not enable the handset (Mic) and the handset (Ep) of the closed phone, and if the closed phone is the main phone, the network 22 is connected to the hybrid 27. Do not combine

In this state, the main computer may add an error beep or voice if any phone in the system is notified of being closed by an off hook private operation. This beep causes the communication to enter a phone, i.e. a phone reserved for private communication (either I or TL mode), alerting the closed phone that it wishes to join. The beep starts with the phone closed by the telephone operator pressing '1', '2' or '0' on the keypad, and therefore the buzzed sound may be removed by simply pressing the P button.

Specific-S

Each phone for the system has a specific function button on the keypad labeled S. Among the features of S in this system are: That is, either of the extension telephones can prevent ringing signals in the extension telephones caused by incoming telephone calls and can prevent any and all intercom buzz. This is done in the extension telephone by putting it off hook and then pressing the S and buttons on the keypad during TL mode.

Another special feature is that each computer remembers the telephone of the next number dialed by the telephone. For example, a typical use of this feature is when a phone call is made by a phone, which gets a busy signal and then the phone rings. Thus, the telephone operator to be off hooked can redial the next number dialed by simply pressing the " S " button, and can be likewise by pressing the next " 0 " button. Redialing is a speed dialed at about 7 digits per second.

The main phone can also remember the repertory of many other phone numbers. These multiple telephone numbers can be stored by the power of the main computer.

For example, it may dial the next number dialed from the main phone contained among these digits, that is, 12 addition numbers with a maximum of 160 digits. In a special case, the number stored in the main telephone computer is stored in the main computer by the operator of the main telephone computer as follows. That is, first off-hook, then press the S button, then press the ＂#＂ button, then press one of the 12 buttons at the top of the three rows of the next keypad (see Figure 14), By pressing a number in the keypad to enter a specific phone number, the memorized number of entries can be stopped by pressing the main phone on hook or pressing any of buttons I, H, P or S.

Automatic dialing, ie speed dialing, from this repertoire of the next memorized number can be done by one telephone in the system, where the S button is pressed by the telephone hooked off and then the keypad (Figs. 14a and 1). One button at the top of the three button rows on FIG. 15A) is pressed. It should be noted that these buttons which start dialing of the stored telephone number include the I, H and P buttons.

If the storage capacity for storing the telephone number no longer remains in the main computer, the computer will either ignore the additional number attempted to memorize or generate an error beep in the receiver of the main telephone.

Obviously in the case of an AC power failure, the main phone will lose phone numbers if the battery is not equipped. Also in this case, if the main telephone is unplugged from the AC power line, the stored telephone numbers will be lost.

In the extension telephone, if the telephone is not plugged from the power line or the extension telephone is not equipped with a battery, in the case of a power failure, the dialed serial number stored in the extension telephone is lost.

With this general understanding of the I, H, P, and S features, let us now consider the following sequence of operations performed by the main (M) and extension (E ₁ , E ₂ ) telephone systems, subsystems, and computers.

System behavior-normal and additional behavior

The normal telephone operation in the system is defined here, which is an external call made or received by the main telephone and also by either or both of the extension telephones and by two or all of the three telephones as external calls. It involves doing.

These functions are described as the ruoutines and subroutines performed by subsystems in M, E ₁ and E ₂ phones. These common telephone execution routines and subroutines are listed in the function table of FIG. 7 and the signals stored and inputted and transmitted by the computer program of the computer included in the system for each of these routines understand the operation of the system. It is listed as a function table.

nomenclature

The system, subsystem and functions are omitted from the description and table below.

The same notation can be applied to the system, subsystem and routine in each phone except for extension phones E ₁ and E ₂ , where M is done again by E ₁ or E ₂ , and the RX input into the transmitter There is none at all, but instead there is an enabled handset (Mic), called MicEn, and when the called EpEn is enabled, the receiver's output enables the handset (Ep) of the handset, and then tone It should be noted that is sometimes added to the output of the receiver and represented as Tn. Intercom signal transmission in both main and extension telephones is referred to as buzz (BUZ) and is referred to as function BUZ. These symbols are used to describe the system, subsystem and routine as columns along the top of the table and also to define the routines, routines and responses along the left side of the table in rows.

Prior to describing these routines for performing ordinary and additional functions (defined herein), the interface subsystem 21 of the telephone line shown in FIG. 5 and M reserved for I and TL modes, Consideration should be given to the operation of interface 21 resulting in I and TL modes and H for various combinations of E ₁ and E ₂ .

The table below shows the subsetting (SS) relay 33, carrier relay 34, hold (H) relay 35, main hook switch (MHK) 33, and network (Ntwk) for the rutin described as columns. Rows showing the states of the 22 and the hybrid 27 are shown.

Each of these circuit states is marked as + or-. Therefore, for relays it is indicated by a + when the relay is active, by a-when it is not active, by a + when it is off-hook for the main hook switch, by a-when it is on-hook, and in I-mode or TL mode for circuits and hybrids. If it is operated to energize the signal between the telephone lines of the system, it is indicated by +. If not, it is indicated by-.

When both or one of M and E ₁ , E ₂ together are in I mode as shown by the table above, Ntwk and Hybd are both + and show that they are in series with 12V from a series crossing power supply. This table also shows that Ntwk and Hybd are mode operated and cross the telephone line when both or one of M and E ₁ , E ₂ are in TL mode. When any of the routines listed in the table are required, the main TX-RX computer 31 is programmed as a received CODE to supply other inputs to the computer to control the C, SS and H relays as shown in the table. For this purpose, as shown in FIG. 5, the computer 31 output controls the relays 33b, 34b and 35b of the relays 33, 34 and 35, respectively. The signals of the lines marked SS, C and H in amplifiers 33a, 34a and 35a are included.

Normal function operation

7 will now be described according to FIGS. 5 and 6 and the interface operation table.

The table in FIG. 7 shows the routines, subroutines and responses of M, E ₁ and E ₂ for performing normal functions by the three phones of the system. The function shown by the table of FIG. 7 is as follows. In other words

Answering a call by E ₁ .

Called by E ₁ .

(E ₁ + E ₂ + M)-TL communication.

For these routines, if the subsystem or its function is marked with a +, the subsystem or its function is enabled, and if it is blank, it is disabled. (Same as minus). Making a call by E ₁ , the first subroutine is an E ₁ -off hook and the common input in this system and E ₁ is answered by TX and CD. In response to this, M, RX ₁ will thereby receive the RF and CD, and the computer 31 is turned ON × T CD to E ₁ operation, and the C SS, and the transmitter 25 via the hybrid.

Where, C and SS when both the + and hybrid is connected across the TL, to be recognized that the CD that sent the E ₁ is received at the E ₁ (as indicated by the R and E _1), where E ₁ is Receives the RF and CD, as a result, the computer 46 at E ₁ sends an EpEn signal to its receiver 42 and also a MicEn signal and TX signal to the transmitter 44. All of these results are provide for storing the off-hook of E ₁ to the main computer 31, connected to a hybrid 27 which intersects the telephone line 1, and the water supply in the turns on the transmitter E ₁ in the E ₁ garden tub Enable handset and handset at.

The following sub-Lou tin is E ₁ - dialog and this there is supplied to the E ₁ a computer 46 as an input command in the E ₁ starts whereby an operator puncturing key on the keypad 53, the keypad 53 is as M It converts as CODE (C) transmitted by the transmitter 44.

The response at M is for receiving a CODE containing a code byte for the number dialed at E ₁ , detecting the CODE and supplying the detected CODE to the main computer 31.

The R, M, and R × 1 outputs displayed in this way are disabled so that the system DTMF 36 converts the received code into a dial tone and sends it to the output of the receiver 26 on the line 36a to the hybrid 26 on the telephone line. Supply the output of). The same sound is also supplied to the input of the main transmitter 25 from the operator of the as received sound from the receiver is sent back to the E ₁ E ₁ E ₁ can hear the sound. This is shown in the table as R, E ₁ . Therefore, the routine that is called by E ₁ is completed when there is a dialed call.

The next ruout shown in FIG. 7 is a response call by E ₁ . This rutin starts with an input command at M sending a ringing code to E ₁ and E ₂ .

R and E ₁ receive the ringing code and process the ringing code in the computer 46 which generates a signal to the line 47 to turn on the drive circuit 47 for driving the speaker 48. These signals of signal 47a from the computer cause the speaker to generate individual audible sounds that indicate external ringing.

Lou then tin is E _1, starting with the hook-off command input from the E ₁ and E ₂ for transmitting the CD to indicate such a condition - the off-hook. These R and M receive CODE and operate C and SS which enable Rx1 and perform Hybd across TL. In addition, the main transmits the code to E ₁ and R ◎ E ₁ when receiving the CODE to enable Mic and Ep at E ₁ .

When the CODE is issued, the E ₁ -TL state is obtained so that E ₁ receives the incoming incoming call.

Continue in the state of the ruout E ₁ -TL by Conf between E ₁ , E ₂ and M and the telephone line (Conf). The first stage of this rutin is the E ₂ -off hook followed by the M-off hook. The subroutines and responses involved in this operation can be accomplished in the table below.

I mode operation

The table of FIG. 8 shows the routines, subroutines, and responses to achieve each of the following.

(M + E ₁ + E ₂ ) -I

(E ₁ + E ₂ ) -I

(E ₁ + E ₂ ) -I, M-TL

Operate HK and Ntwk at M-off HK M.

MI: M is connected to Ntwk and Hybd in series when the I button is pressed, as shown by the operation table on page 34 so that both ends of the Hybd and relays can be operated at 12V to operate all of MHk, Ntwk, Hybd and SS. Activate the SS.

MD ₁ E ₁ : When M presses the I button, this turns on T × m transmitting CD ₁ (for BUZ) addressed to E ₁ .

R ◎ E ₁ : The response at E ₁ receives R × m, detects CD ₁ (for BUZ) and operates the signal driver drive circuit 47 of E _{1 with} the BUZ signal, whereby E ₁ is intercom communication. Be buzz about.

E ₁ -off Hk: When E ₁ is off hooked, E ₁ turns on T × 1 which transmits a CD (for an E ₁ -off hook).

R ◎ M

Detects - the answer to M is a CD (for off-HK E ₁₎ that results in a T × M gekkeum send (which addresses the E ₁₎ receives the R × 1 and the CD ₁ about MicEn and EpEn in E ₁ .

R ◎ E _1: is a RXm the answer to E _1, as detecting a CD1 and MicEn and EpEn, is achieved the M + EI-I Lou tin state.

MD1E2: when M is pressed, the two buttons, M is a T × m turns on to transmit the CD2 (for BUZ) addressed to E _2.

R ◎ E ₂ : The response at E ₂ receives R × m, detects CD2 (for BUZ) and activates the signal driver drive circuit 47 of E ₂ with the BUZ signal, whereby E ₂ buzzes for intercom communication. do.

E ₂ -Off Hk: E ₂ turns on T × 2 which transmits a CD (for an E ₂ -off hook) when E ₂ is off hooked.

(- for the off-hook E ₂₎ response from the M is the CD that allows at E ₂ for receiving an R × 2 for MicEn and EpEn sent to CD2 (the address search for E ₂₎ resulting in a T × m: R ◎ M Detect.

The response at R? E ₂ : E ₂ is R × m, and upon detecting CD2 and MicEn and EpEn, the M + E ₁ + E ₂ -I rutin state is achieved.

The second series of ruoutines starts at the rutin state M + E ₁ + E ₂ -I and this aim is to achieve E ₁ + E ₂ -I. This is accomplished as follows.

M on hook: When M is on hook, MHK, Ntwk and Hybd are deactivated and output the outputs of MRX1 and MRX2 coupled to 340 via Hybd 27 as RX to MTXM and E ₁ , E ₂ in the intercom. The relay SS is deactivated to feed directly to the input of the. Thus E ₁ + E ₂ -I rutin status is achieved.

A series of third Lou Tin begins from E ₁ + E ₂ -I This is to achieve the _{E 1 + E 2 -I, M} -T1. This is done as follows.

M off hook: When M is off hooked, Ntwk works while E ₁ and E ₂ are in I, but Hybd does not. This is because relay C does not work (when Hybrid is activated, relay C couples one side of Hybd to the telephone line).

E at M receives a dial tone from TL via Ntwk.

MD ₁ T1: When M receives a dial tone, the external number and call of the M dial D1 is answered. This achieves an E ₁ + E ₂ -I, M-TL rutin state.

For this series of first rutin the ruout state begins with all on hook states of M1, E ₁ and E ₂ .

In this final routine, when the ringing signal coming from the telephone line is generated, the starting points are E ₁ and E ₂ in I mode where M is off hooked to answer the incoming call.

All steps shown in detail in FIG. 8 to understand the operation of the interface 21 as shown in the table according to the routines, subroutines and responses described in detail with reference to the ordinary functions of the table in FIG. There should be no problem in doing this.

H function operation

The table in FIG. 9 describes the routines, subroutines, and responses for performing the following functions.

H-TL by M and (M + E ₁ ) -I

H-TL by E ₁ and (E ₁ + E ₂ ) -I

H-TL by M and (E ₁ + E ₂ ) -I

Whenever the telephone line is in hold, Ntwk and Hybd are both active, whether initiated by mains or expansion, and in series with 12V from the power source across the series while the hole drill impedance (35C) is across the telephone line. In this state, the combination of intercom calls can be made between M, E ₁ and E ₂ . During the H-TL state, any intercom state is enabled but only M that is not reserved for I can be off-hook to TL mode and remove H. These means are that if E ₂ is off-hook while H-TL, M and E ₁ are in I mode, then I is removed so all three calls are made in TL mode.

P function operation

The various P function routines are shown in the table of FIG. Such rutins include:

P between M and TL

P between M, E ₁ and TL

P between E ₁ and TL

P between E ₁ , E ₂ and TL

P between M and TL during (E ₁ and E ₂ ) -I

In any of the above states, the closed system phone may be off hooked. Such rutin is shown at the end described above. When M and E ₁ are in I mode and when either of M and E ₁ initiates P, E ₂ is closed and thus E ₂ is off-hook, it indicates the closed state of its I mode and accesses TL It doesn't work. On the other hand, if E ₁ and E ₂ are in the I mode or one of them press P, then the main M indicates I is closed but if M is off hooked it is automatically in TL mode and then M is It can be switched to the I mode by the operator. This continuation is also shown in FIG.

S function behavior

The S function is initiated by the operator pressing the S button by some telephone that is off hooked in TL mode. This is used to redial the last number dialed by the telephone or to dial out one of the stored telephone numbers from the list of telephone numbers memorized in the main computer.

Several rutins involving the S function are described in the table of FIG. It includes the following:

Re-dial of S-last number by M

S-dial list number by M

Re-dial of S-last number by E ₁

S-dial list number by E ₁

M and E computers and codes

The CODE portion of the transmitted data (TX DATA), including the address byte, code byte, and checksum byte shown by the waveform of FIG. 2, is described herein as a specific embodiment and is shown on the electrical block diagrams of FIGS. It is suitable for the power line carrier telephone expansion system shown specially. When such a CODE is used in an embodiment of an extension telephone system, the address byte is an 8-bit binary number that the user manually sets 4 bits for and the other 4 bits are fixed (or preset in production). However, certain N bits can be advantageously used in the present invention. The user sets four bits of the E ₁ address and the E ₂ address by the address setting switch 38 in the main telephone. Next, the user sets the same 4-bit address of E ₁ to E ₁ in the address setting switch, and setting the same bit of the address from the E ₂ E ₂ as the address setting switch 54. By setting the address setting switch in this way, the address byte sent from the phone and the address byte that can be recognized as the CODE received at the phone to which the transmission is directed are matched and if the received CODE does not contain the address byte, The computer of the received telephone does not allow its receiver to respond to the DATA accompanying the CODE.

This setting method of address bytes provides flexibility and the setting of the address byte at M is matched at E ₁ and E ₂ , and even if the user does not set anything, the setting bits of the production can be matched because they provide enough addresses. will be. For example, during a given system of M, E ₁ and E ₂ , the four bits of the E ₁ and E ₂ address settings in production would be bits 1000 and 0100 bits, respectively, and the manual switch in all phones would be set to £ 0000. Start with Even if the user executes the switch setting, these systems will do everything described here. This is because the E ₁ address setting in both E ₁ and M will be 1000000, and the E ₂ address setting in both E ₂ and M will be 01000000. Obviously, however, it is necessary to choose to set four bits of the address of E ₁ and E ₂ . That is, it is necessary to equally and also set equal to the address is also set in the address setting of the M and E ₂ E ₂ at the address set in the address setting of the M and E ₁ and E _1. In addition, it is necessary to set the 4-bit setting manually for E ₁ and E ₂ by the user. In addition, it is clear that the 4 bit setting can be manually set equally for E ₁ and E ₂ by the user and that the system is performed in all relations as described herein (because the coefficient setting bit is Different). Thus, the bits that can be set manually from the M (4 bits for the 4-bit and E ₂ to E ₁₎ will be completed by the four single set of switches for setting the same four bits of the E ₁ and E ₂ manually And likewise the same four bits can be set manually at E ₁ and E ₂ .

The first purpose of the address byte is to identify the data transmitted from M as an RF carrier. Another purpose is to identify system data on Fm and also signals from other systems on Fm. For example, if the probability of neighboring premises with such an extension telephone system with the same FM is 1:10, then the probability of having 4 set bits of the same Fm and the same coefficient for the next E ₁ or E ₂ is 1: 10 ×. If 2: 2 ⁴ or 1: 80 and if both probabilities have the same Fm, then the same coefficient set 4 bits and the same manual set 4 bits for E ₁ or E ₂ equal to 1: 80 × 2: 2 ⁴ or 1 : 640.

The code byte portion of the CODE is generated by the computer in each telephone in accordance with an instruction by each telephone and a command received at each telephone from another telephone and stored in the computer. As already described with reference to FIG. 2, the checksum byte establishes to be received only by sending an address and a code byte. With this format in mind, the M, E ₁ and E ₂ code bytes for the various instructions can be set as shown in Table 2 below.

Testing of the routine table to perform various functions of the telephone system shown in FIGS. 7 to 11 is initiated when the transmitter in a telephone transmits the CODE, so that the input of the transmitter (either at the main receiver or at the enlarged handset) It is disabled to immediately transmit the CODE, and if the transmission continues, the input of the transmitter is enabled again. This is also shown in Figure 2 and no VOICE is transmitted for 31.68 milliseconds when the CODE is transmitted. Obviously this 31.68 milliseconds is so short that it cannot be seen as a disturbance by the user.

M and E power line coupler (adapter plug)

The main telephone power line combiner circuit 28 is shown in electrical detail in FIG. 12, and the extension telephone power line combiner circuit 41 is shown in detail in FIG. This figure shows a detailed circuit of the coupling circuit portion and the adapter plug portion in the telephone. In both cases, for example, the power line 110 VAC is interrupted at the adapter plug, so that even when the cord (see FIG. 4) is plugged in, it can be of considerable length to allow freedom of movement of the phone from the telephone to the adapter plug. It carries all the power and RF signals between the phone and the power line, and all 110 VAC power lines are relatively low voltage and low power, so if the cord moves 110 VAC into the phone enclosure, it can create an inherently safer tool than any conventional one. have.

In FIG. 12, the power line coupling circuit 12 of FIG. 5 for the main telephone constitutes an Rx-Tx transformer 61M located inside the main telephone enclosure, which includes a conventional AC power line receptor claw plug. There is an adapter plug 6 to be fitted and a cord 6a from the main telephone. The adapter plug 6 contains the small circuit of the main supply, ie the coupler, and it is necessary to isolate the 110 VAC from the telephone in the plug.

The output of the power amplifier 211 to the main transmitter (MTX) is supplied to the Rx-Tx transformer 61M, and also the receiver of each channel 1 and channel 2 (MRX-1 and MRX 2 in the main receiver 26) The input is obtained from this transformer. In particular, the main RX-MX transformer comprises a primary coil 62M and a secondary coil 63M, the output of which is in series with one end of its primary coil via variable inductance 64M and capacitance 65M. And the other end of the primary coil is grounded. The thermistor 66M cross-connected to the primary coil keeps the primary impedance low when the main transmitter MTX is Off. When the main transmitter MTX is on, the thermistor 66M is heated to increase its resistance. On the contrary, when the main transmitter MTX is turned off, the thermistor 66M is heated to increase its resistance. In contrast, when the main transmitter MTX is off, the resistance of the thermistor 66M is reduced. Each input and terminal 2 of receiver M 26 is coupled in series as shown, and the secondary winding 63M of the Rx-Tx transformer is coupled to the bandpass filter of the two receivers and is coupled by the coupling coil of the filter. Combined. Accordingly, the secondary winding 63 is connected in series with the inputs of the second receivers at both ends of the main telephone terminals 2 and 4, which are connected to the terminals 2 and 4 of the cord 6a. Is coupled to The other end of this cord is coupled across the secondary winding 67M of the transformer 68M in the plug at the adapter plug 6 corresponding to terminals 2 and 4, and the primary winding 69 of the transformer 68M. Is connected to the power line 10, and one end of the cord is connected to the power line via a capacitor 71M. By this configuration, the RF signal transmitted from the main is sent out to the power line, and the RF signal moved by this power line is coupled from the power line in the main telephone to the second receiver.

The regulator 32 of the main telephone power source operates all operations on the main telephone except for the power generated from the telephone line for operating the telephone line interface system 21 and for operating the main DTMF 37 as described above. Provide power. The power supply 32 generates a DC voltage of 12 volts and 5 volts for operating the system subsystem in the main telephone. The power of regulator 32 comes from transformer 72M in the adapter plug. The primary winding 73M of the transformer is directly connected across the power line, and the secondary winding has a center tap carried by the cord 6a to the terminal 3 of the main telephone which provides the main telephone grounding. On the other hand, the two ends of the secondary winding are connected together via a biode 75M as shown to provide a rectified positive voltage carried by the cord 6a to the terminal 1 in the main telephone. 1) supplies an input to the voltage regulator 32. Thus, the adapter plug is plugged into power 10 and terminal 1 obtains a positive voltage that is full-wave rectified with respect to the main voltage regulator.

The power line coupling circuit 41 in the extension telephone (FIG. 6) is shown in detail in FIG. This circuit also includes an extension telephone enclosure, an adapter plug 15 and a cord 15a from the telephone to the plug. This basic circuit portion is the Rx-Tx transformer 61E, cord 15a and two transformers 68E and 72E in the extension plug of the extension telephone. The part contained here may be the same and has the same function as the equivalent part described above with reference to the main power line coupling circuit 28. As shown in FIG. Similar parts bear the same reference numbers accompanying M or E. The essential difference between this coupling to the main and extension phones is that the extension phone has only a single receiver ERXn (channel m receiver) instead of two receivers. Then, since the cord and plug are interchangeable, it is obviously the same as the adapter plug 15 and its cord 15a for the main telephone.

M and E keypad

The main telephone keypad (29 in FIG. 5) carries the operation buttons as shown.

These operation buttons include conventional contact sound 1-9 and 0 * and # buttons, in addition, these buttons carry the intercom (I), hold (H), private (P) and specific (S) buttons. . An illustration of the keypad 29 is shown as FIG. 14A. Electrical diagrams 14b and 14c and their associated tables 14d and 14e respectively illustrate the system and telephone line operation functions of the main keypad. When the main telephone is operated outside of the system, in particular, the telephone line operation described by FIGS. 14C and 14E occurs while it is plugged only in the switching line when it is operated without AC power. For this operation, all power from the phone comes from the phone's power line. And this operation is inherently common.

During normal operation, only ordinary keys 1 through 9, 0, *, and # operate pins 1 through 8 of the output terminal board 29 of the key pad. The interconnection of these pins achieved by pressing the various keys of the pad is listed in the table of FIG. 14e and schematically illustrated by FIG. 14c. For example, when the key 1 is pressed, pins 2 and 3 are also connected because one row and one column are connected. When the key 2 is pressed, one row and two columns are connected, and the pins 2 and 5 are also connected.

Thus, other combinations of rows and columns are also connected when each key in the contact pad is pressed. These rows and columns are represented here as R1, R2, R3, R4 and C1, C2, C3.

When R3 is connected to C2, it is obviously only indicated when the key 8 is pressed. This telephone line operation of the main keypad works only with the main DTMF 37 (see Figure 5), so the connection from the keypad to the main DTMF is connected in common with R1, R2, R3, R4, C1, C2, and C3. do.

14d and 14e illustrate the operation of the main keypad in system mode, where the main system and subsystems are biased by the main regulator 32 when the mains are plugged into the power line. In this case, all the keys, including the I, H, P and S keys, are active so that the operation of these keys is defined by R1, R2, R3, R4, C1, C2, C3, C4 and common.

In this case, the pins 9 to 17 of the output pad 29a are also activated, and all the output pins 17 of the pad 29a are also activated. For example, when the key 1 is pressed, the pins 2 and 3 are connected, and the pins 16 and 13 are also connected. When I is pressed, none of pins 1 to 8 is connected, but pins 9 to 16 are connected.

The connection between the pins 1 to 17 of the main keypad 29 and the main DTMF 37 and the connection between the system DTMF 36 and the main computer 31 will be described later with reference to FIG. The operation of the address code setting switch 38 in the telephone is explained.

The enlarged keypad 53 is shown in FIG. 6, and the electrical connection between the key and the output pins of the keypad output terminal board 53a is shown in FIGS. 15A, 15B and 15C. If the extension telephone is not plugged into the power line, the extension telephone cannot operate, so that only the system operation is performed on the extension telephone, and all 16 keys can be operated simultaneously on the keypad. Here, the output pins are indicated by (1) to (3) as listed in the table of FIG. 15C, which is connected to the rows R1 to R4 and the columns C1 to C4. Thus, the pins 9, 3 and 8 are shortened when the key 1 is pressed and the pins 9, 4 and 7 are shorted when the key S is pressed.

Here, as far as the main telephone keypad is concerned, the output of the keypad is designated by the rows and columns of the pins rather than the pins, and the pin names are described only with reference to these drawings. This pin name is not changed by the operation of the keypad system. The electrical connection between the expansion keypad 53, the expansion computer 44, and the expansion address setting position 54 will be described more fully below with reference to FIG.

M and E address code setting switches

In the main telephone, four bits of the address bytes of E1 and E2 are set by the switch 38, and the same four bits are set by the address switches 54 in each of the extension telephones. The purpose of this setting is mentioned above. In short, this purpose is to give the user the opportunity to change the address. This opportunity arises to change the address in the case of communication from such other sources, such as a telephone system of a neighboring powerline that the user has designed identically.

This is convenient for setting a 4-bit address to a computer using the same line in both the main and extension telephones, which supplies the key signal from a keypad in the computer, which is done in both the main and extension telephones. All.

16 shows a main keypad 29, a main DTMF 37, a system DFMF 36, and an expansion address setting switch 38. As shown in FIG. Of the two banks of these switches 38a and 38b, 38a is for setting the 4-bit address of E1, and 38b is for setting the 4-bit address of E2. When all the switches are in contact, current flows through the diode. When transistor 40 is enabled by a signal in line 40a from the main computer, current flows through diode 39, generally denoted 39. Flow.

This enable signal is generated very simply every hour and the main computer is reset, which is reset every hour during which power is interrupted from the power line to the telephone line and reset again by continuation of power. Thus, whenever the switch is set, this setting is stored in the computer just before the telephone is plugged into the power line. The switch is convenient to feed settings into the computer from the keypad via the lines labeled R1 to R4 and C1 to C4.

As shown in FIG. 16, in the main telephone, eight lines of R1 to R4 and C1 to C4 are used. Immediately starting the power from the power to the telephone, the transistor 40 is not enabled for too long, the switches are not played separately, the main keypad 29, the system DTFM 36, the main DTFM 37 And computer 25 does not result in signal flow.

The operation of the address setting switches 54 in the extension telephone is the same as the address setting in the main except that a single bank of four switches is required.

As shown in FIG. 17, when the transistor is enabled by a signal in the line 56a from the computer, the banks of the four switches 54a are supplied through the diode 55 and the transistor 56. As shown in FIG.

In this case, it is convenient to supply the impulse from the expansion keypad 53 to the computer 46 from the switch via the lines R1 to R4.

Main and system DTMF

As shown in FIG. 5, the main telephone includes a system DTMF 36, which generates a conventional double tone (contact tone) for dialing a telephone line and generates a main (or sub). The same is true for the DTMF 37. One skilled in the art is that any suitable telephone signal transmission device can be replaced here, in particular a rotary dialing device or the like, while being described using DTMF in the system shown here. It will be appreciated that a negative combination device or dial signaling device may be used in this system.

The main DTMF supplies the telephone line interface 21 and is output by the telephone line. It works in conjunction with the main key pad 32, the network 22 and the hookswitch 23, which supplies sound, and one of the primary windings 22C of the network dials in the key pad as a sound. The details and connections of these circuits and the coupling between them are shown in FIG. This figure shows the details of the network 22 and hybrid 27, the main hookswitch 23 and the C, 22 and H relay switches. The parts of the network 22 and the hybrid 27 are the same.

The leading end line 1A in FIG. 18 passes through the subset (SS) relay 33 and the switches 23-1 to 23-3 of the hook switch set 23 to the parallel diode bridge circuit 21a. Connect. The signal 1b is connected directly to the diode bridge via the SS relay 33.

Either line (leading line or beacon line) is at the positive voltage level on the other side, and this positive voltage is fed via the bridge to the Vbb terminal of the main DTMF 37, and likewise, negative voltage level on either side for the other line. The negative voltage is supplied to the ground terminal, which is the Vss terminal of the main DTMF 37, via the bridge. In this way, the DTMF 37 is output from the telephone line.

When the DTMF 37 receives the control input signals on the lines R1 to R4 and C1 to C3 from the main keypad 32, the DTMF 37 causes both ends of the capacitor 22d of the network 22 and the secondary windings. A combination of occupied sounds is generated in the output line 37a at 22C.

This dial is coupled to the secondary winding 22e by the action of a transformer and stays on both the front end line and the signal line via the SS relay 33, so that it is transmitted to the dial negative telephone line from the main subset. The center tap 22g on the primary winding 22e is connected to the handset 29 Ep of the main handset 29. The main talker 29 Mic is also connected across the primary winding 22C when the handset 29 is off hook, except when a dial tone is generated at the output of the DTMF 37.

The dial squelches the transmitter Mic via line 22f by turning on a transistor (not shown) in the Mic. Therefore, the main handset can generate an audible dial tone, and when the operator dials, the main handset is cut off.

conclusion

The general embodiments of the invention described herein with reference to FIGS. 1 to 3 have useful applications for certain power line carrier communication systems, and in particular, such systems as they can operate in residential premises where interference may occur. Has a very useful application. Moreover, the above-described technique for performing intercom, hold, private, etc. is a conventional telephone system having an extension telephone using two wire telephone lines between jacks in the premises without using a power line for communication between the telephones of the system. It has a useful application in. Certain embodiments of the present invention incorporate encoding and decoding techniques because certain instructions are performed using codewords.

The power line telephone extension system for a particular embodiment of the present invention has been described to show all the advantages of the general embodiment in power line telephone extension systems.

In addition, this particular embodiment describes all the implementation and use of hold, intercom, editorial, and additional or novel features referred to specifically.

This additional feature is shown according to the advantages obtained by the present invention as shown by the appended claims and the performance of the operation and function of the circuit of the present invention, which makes it seem to solve all the drawbacks.

Other specific embodiments and certain modifications to the general embodiment will be apparent to those skilled in the art without departing from the spirit and scope of the invention.

Claims (34)

Telephone subscribers of a conventional telephone system in which a telephone line separate from the central switching system is provided at one location of each subscriber in the subscriber's premises, each telephone line comprising at least two conductors, ie, ring lead and lead lead. One or more expansion switches E ₁ and E ₂ for signal transmission by RF carrier via the telephone line 1, the transmission line 10 in the subscriber's premises, and in the subscriber's equipment, the telephone line (1) and a telephone for transmitting a signal between the subscriber station main station M coupled to the transmission line 10 and the subscriber extension station En up to ＂n 결합 coupled to the transmission line 10, respectively. A system comprising: (a) at station M: (a1) generating coupling means 22 coupled to the telephone line for detecting information signals on the telephone line, referred to as TL signals, and (a2) the main carrier frequency Fm; This main carrier frequency And the master M transmitter 25 for modulation as the information signal, (a3) the transmitted RF carrier frequency of En station _{(F 1, F 2, ...} Fn) of one is provided for each En stations to receive the other Means for generating a synthesized receiver output signal called MRXN by combining the N receivers 26 with an Fn demodulator for generating a modulated wave of Fm at its output and (a4) the outputs of the N receivers. (27) and (a5) means 28 for combining the detected TL and MRXN signals to couple the synthesized signal to an input of an M transmitter 25 called MTX, and (a6) an M transmitter output. A means 31 for coupling to the furnace conveys the Fm modulated via the transmission line to the En stations, and (b) at each En station: (B1) En telephones (12, 17) and (b2) En (B3) a Fm demodulator 216 that is modulated with an En telephone power source 10 that enables the telephone to generate an information signal. Means 41 for receiving the Fm and generating a modulated signal of Fm called EnRX at the output and (b4) means 41 for coupling the modulated Fm to the input of the receiver on the transmission line, and (b5) Means 46 for coupling the EnRX to an En phone, so that the En phone receives TL and MRXN signals, and (b5) means 47 for enabling the En phone to regenerate the information signal; b7) an En receiver 44 having means 48 for generating an En telephone carrier frequency Fn, and means for modulation for generating an Fn modulated by modulating Fn by an En telephone information signal; (b8) a modulated By providing means 46 for coupling Fn to the transmission line, the transmission line returns the modulated Fn to the main station so that a telephone call from the diverting line can be answered by any of the En telephones. Any or all of the phones can communicate Power line telephone expansion system characterized in that. In the system of claim 1, which comprises means 201 for addressing a signal transmitted on a transmission line, the system of claim 1 comprising: (a) a digital address word consisting of several binary bits representing the address of one of the En stations; Means 207 installed in each country for generating and adding an add to the signal to be transmitted, and (b) means for modulating the digital address word and the signal by an RF carrier frequency and infiltrating the transmission line at the station. (210), and (c) storing the local digital address word, detecting the infiltrating digital address word from the received RF carrier, and storing the detected digital address word with the stored local digital address word. Means 208 installed in other En stations for comparing and controlling detection of the received signal according to the comparison result, and (d) stored local digital address. A power line telephone extension system that only the signal with the War Admiral is provided with a means 223 to be detected by the En station according to claim. 3. The apparatus of claim 2, further comprising: (a) means 207 provided to each En station for generating an address word consisting of several binary bits representing information about a constant signal and adding it to a digital code word; Means 210 for modulating an address word and a code word and a signal to be transmitted by an RF carrier frequency to infiltrate the power line of the station; and (c) storing a plurality of such digital code words and storing the code word. Means 208 provided in each En station for generating a signal indicative of a comparison of the codes and comparing the detected codeword with the stored codeword, and (d) comparing the detected signal with the codeword. And a utilization means (227) for responding to said signal indicative of. 4. The apparatus according to claim 3, wherein (a) means provided for each En station for generating a checkword and adding it to an address word and a code word composed of several binary bits representing a combination of an address word and a code word. (207), (b) means 210 for modulating the address word, code word and test word by carrier frequency to infiltrate into the power line at the transmitting station, and (c) detected address word Means (223) provided in other En stations for combining the codeword with the detected testword to compare the detected testword with the detected testword and controlling the detection of the received signal according to the comparison result; Means 220 for detecting only a signal having an address, a code and an inspection word for synthesizing the detected address and the codeword so as to compare the detected inspection word in a predetermined manner. Expansion system. 3. The power line telephone expansion system according to claim 2, wherein a modulation rate of binary bits is larger than a modulation rate of a signal. 6. The apparatus of claim 5, comprising (a) means 223 for integrating the received RF carrier over a time interval of each bit, and (b) means 224 responding to it to determine the value of the bit. Power line telephone expansion system, characterized in that. 2. The system of claim 1, wherein the transmission line is the subscriber's power line (202). 5. The system of claim 4, wherein the address word, the code word and the check word are temporally ahead of the signal. 2. The system of claim 1, wherein the information signal comprises an audio, dial, or hold signal. The power line telephone extension system according to claim 1, wherein the information signal includes a HOLD signal and detects the hold signal and connects a HOLD impedance (23) across the telephone line so as to hold the telephone call. 11. The method according to claim 10, wherein the HOLD signal generated at the En station is a digital codeword called a hold codeword composed of several binary bits meaning a hold command by the En station, and the hold codeword is an En station carrier frequency ( Modulated by Fm) and immersed on the power line in the station, storing hold codes, comparing the detected hold codewords with the stored hold modes, and connecting hold impedances across the telephone line according to the comparison result. And a means (31) for controlling the means (21), wherein only a hold code word that satisfies the comparison is effective for holding the switching line. A system for signal transmission between stations coupled by line transmission, comprising: (a) a main station denoted by M and E ₁ , E ₂ . En… At least one satellite station (up to N) denoted by En, (b) at station M: (b1) M transmitter 201RX for transmitting the information signal as a modulation signal of carrier frequency Fm, and (b2) satellite station carrier frequency F ₁ , F ₂ . Fn… N receivers 203RX, one for each satellite station, for generating output by detecting a corresponding one of Fn and detecting a corresponding satellite station information signal modulated wave of satellite station carrier frequency Fn, and (b3) the M receiver Means (224) for synthesizing the output of a synthesized receiver output signal called MRXN, (b4) means (307) for coupling the MRXN to an input of an M transmitter, and (b5) an input of said N Means 327 for coupling to the receiver and for coupling the output of the M transmitter to the transmission line, (b6) means 330 for causing all information signals from the N receivers to be transmitted over the transmission line to the carrier Fm, ( c) In each satellite station En: (C1) En receivers 321 to 325 for receiving Fm, (c2) En transmitter 210TX for transmitting information signals as modulation waves of the station carrier frequency Fn, and (c3 ) The signal source 326 of the En information signal, and (c4) the En reception signal utilization device 343. (C5) means (344) for coupling the En source output to the En transmitter input, (c6) means (331) for coupling the En receiver output to the En utilization device, (c7) the input of the En receiver and Means (327) for coupling the output of the En transmitter to the transmission line and (d) means (330) for enabling two or more of said satellite stations to communicate with each other in full duplex simultaneously. Expansion system. 13. The apparatus according to claim 12, wherein means provided at station M for coupling the input of the M receiver and the output of the M transmitter to the transmission line comprise: (a) a station M input / output (RX-TX) transformer having a primary side and a secondary side; 61M), and (b) an M station adapter plug (AP) transformer (6) having a primary side and a secondary side, wherein in the M station RX-TX and AP transformers, the input of each M receiver is an MRX-TX. Coupled to the secondary side 63M of the transformer, the output of the M transmitter is coupled to the primary side 62M of the MRX-TX transformer, one side of the MRX-TX transformer is coupled to one side of the MAP transformer, and the other side of the MAP transformer And a power line telephone extension system, characterized in that it is coupled to the transmission line (6a). And the other side of the MAP transformer is an inductance-capacitance circuit (61M). 14. The system of claim 13 wherein the M transmitter outputs are coupled to the other side of the MRX-TX transformer and the inputs of each M receiver are coupled to one side of the MRX-TX transformer. 16. The system of claim 15 wherein the inputs of each M receiver are electrically in series and the serial inputs are in series with said one side of an MRX-TX transformer. 13. The apparatus of claim 12, wherein all means at station M are housed in at least two separate enclosures with first and second M enclosures, the first enclosure having M transmitters, M receivers, and MRX-TX transformers. 61M) and a second enclosure with a MAP transformer (15), wherein the enclosures are connected by an electrical cable (15a). 18. The transmission line according to claim 17, wherein the transmission line is a power line (10), the second enclosure having electrical contacts (1,2,3,4) projecting from the enclosure to connect to the power line in a conventional power line receptacle. A power line telephone expansion system, characterized in that it is small in size and lightweight enough to be held in the receptacle by the contact. 19. A system of claim 18 comprising a power source at station M, comprising: an M power transformer PT having a primary side and a secondary side, and an M voltage regulator 32, one side of the MPT being connected to a power line and the other; The side is connected to an M voltage regulator (32), wherein the M voltage regulator is embedded in the first enclosure and the MPT is embedded in the second enclosure. 13. The transmission line according to claim 12, wherein the transmission line is a power line 6a, and means 28 provided at each satellite station En for coupling the input of the En receiver 26 and the output of the En transmitter 25 to the power line are: (a) 1 En station input / output (RX-TX) transformer 61E having a primary side and a secondary side, and (b) an En station adapter plug (AP, 6) having a primary side and a secondary side, wherein the En station RX- For TX and AP transformers, the input of the En receiver is coupled to the En RX-TX transformer 61E, the output of the En transmitter is coupled to the En RX-TX transformer 61E, and one side of the En RX-TX transformer is A power line telephone extension system coupled to one side of the AP transformer, wherein the other side of the En AP transformer and the other side of the En A transformer are connected to a power line (15a). 21. The power line telephone expansion system according to claim 20, wherein the En transmitter output is coupled to the other side of the En RX-TX transformer 61E, and the input of the En receiver is coupled to one side of the RX-TX transformer 61E. . In a typical telephony system, a separate telephone line is provided from a central switching system at one location to each subscriber at a subscriber's location and each telephone line includes at least two conductors, a ring line and a tip line. Subscriber's telephone line and subscriber's main (M) station near the subscriber's place or premises, i.e., the subscriber telephone line calling the transmission line, and at least two (N) subscriber extension stations calling the transmission line (E _1). A RF carrier telephone extension system for transmitting a signal between two or more subscriber extension telephones equipped at, E ₂ ,..., En ... E _N ) and signaling by an RF carrier over a transmission line at a subscriber's site, (a) In station M: (a1) generate means 21a connected to the telephone line for detecting audio frequency signals on the telephone line called TL, and (a2) the main carrier frequency Fm. To the M transmitters with a modulation means for modulating to the means for Fm, (a3) of the transmitted RF En station carrier frequency F _1, F _2, ... F _n … The other of F _n is for receiving, having a demodulator and having one N for each Fn station for generating a modulated wave of Fn at the output, and (a4) synthesizing the output of the N receiver and called MRXN. Means (27) for generating a synthesized receiver output signal, (a5) means (34) for combining the TL and MRXN signals and coupling this synthesized signal to an input of a transmitter called MTX, and (a6) a transmitter By providing means for coupling the output to the transmission line, the Fm modulated via the transmission line is returned to the En station, and (b) in each E station, generally denoted by En: (b1) En phone and (b2) En A current source for telephone 10, (b3) means 47 for causing the En telephone to generate audio and dial signals when the En change is used by the subscriber, and (b4) a modulated wave of Fm at the output with an Fm demodulator An En receiver 42 called En RX for generating (b5) means (41) for coupling the modulated Fm from the transmission line to an input at the receiver and (b6) means (46) for connecting the En RX to an En phone, whereby the En phone is TL and MRXN. And (b7) means 210 for generating the En telephone carrier frequency and modulation means 209 for generating the modulated Fn by modulating Fn by the En telephone audio signal and the En dial signal. Equipped with an En transmitter 44 and (b8) means for coupling the modulated Fn to the power line, thereby transmitting the modulated Fn via the power line to the main station and the telephone call from the telephone line is E ₁ , E ₂ ,. E _n . E _{N allows} any or all of the telephones to communicate with each other on a power line call and, in addition, includes: (a7) means 34a for generating an intercom mode command signal, called an I signal, MRXN and The means a5 for synthesizing a TL signal and coupling this synthesized signal to the input MTX of the transmitter is a multi-port hybrid network 22 called hybrid and controlled by the I signal, in this way the MRXN and TL The signal is synthesized by the hybrid and the synthesized signal is coupled to the input MTX 25 of the transmitter 44, coupled to an on telephone line or dependent on the generation of the I signal, such that the MRXN and TL signals are synthesized as such. And the MRXN is not coupled to the telephone line. 21. The apparatus of claim 20, wherein in station M: the hybrid comprises three ports: an MRXN port coupled to the output of the combining means a4, an MRX port coupled to the input of the transmitter and a TL port coupled to the telephone line; And a switch called a C switch in coupling between the TL port and the telephone line is controlled by said signal. 21. The telephone line of claim 20, wherein in station M: the hybrid is connected via an MRXN port coupled to the output of the synthesizing means a4, an MTX port coupled to the input of the transmitter, and a switch called a C switch controlled by an I signal. And a three-port directional coupling network (22) having a TL port coupled to the power line extension system. 23. The apparatus of claim 22, wherein in station M: a signal flowing between the ports of the three-port directional coupling circuit consists of a signal from the MRXN port to the MTX port, a signal from the MRXN port to the TL port, and a signal from the TL port to the MTX port And the TL port is closed in both directions according to the I signal. 21. The apparatus of claim 20, further comprising means 46 for initiating an En telephony intercom mode command signal, called En I signal, in each En station, wherein said means b7 for modulating Fn is represented by an En I signal. Modulating Fn, and furthermore, at station M: each receiver a3 comprises means 222 for detecting a modulated wave of Fn by the En I signal, and for controlling the multi-port hybrid 27; Means 29 are provided for responding to the En I signal to generate an I signal such that the En I signal initiated in the En phone does not cause the En phone to be coupled from the telephone line without causing the En phone to communicate to the telephone line. A power line telephone expansion system characterized by enabling communication with one or more other stations. 25. The apparatus of claim 24, comprising means 47 for generating, at station M, an En telephony intercomberze signal called an En BUZ signal, wherein said means a2 for modulating Fm is represented by an En BUZ signal. At each En station: means (222) for the receiver b4 to detect a modulated wave of Fm by the En BUZ signal, and the activation of a suitable alerting device informing the caller of the En phone of the intercom call. Means (52) for initiating the powerline telephone extension system. 26. The apparatus of claim 25, further comprising means 23 for generating an M station intercom signal, called MBUZ, in each En station, wherein said means for modulating Fn modulates Fn by the MBUZ signal, And said means for detecting a modulated wave of Fn initiates activation of an alerting device for detecting the MBUZ signal and informing the caller of station M of an intercom call. 25. The apparatus according to claim 24, wherein in station M: M telephones, telephone line network 22 called TL network for coupling M telephones to telephone line, and means for initiating M telephone intercom mode command signal called MI signal. And the TL network is connected to a telephone line by a switch called an SS switch (33) controlled by the MI signal. 28. The method of claim 27, wherein in station M: the voltage source and switch SS 33 connect the TL network 22 to the telephone line when MI occurs, and switch C 34 connects the TL port of the hybrid when En occurs. Controlling the C and SS switches in response to the MI and En I signals so that the switches SS and C connect the hybrid and network 22 in series across the voltage source when the telephone line is connected and MI and En I occur. A power line telephone expansion system comprising means for. 29. The apparatus as claimed in claim 28, wherein (a) means provided for each country to generate a digital address word consisting of several binary bits that are temporally ahead of the signal to be transmitted and represent the address of one of the stations, and add this to the signal to be transmitted. (207), (b) means (206) for causing the digital address followed by the signal to be modulated by the RF station carrier frequency and infiltrated on the power line at that station, and (c) the same digital address word Other stations for storing the digital address word from the received RF carrier, comparing the detected address word with the stored digital address word, and controlling the detection of the received signal according to the comparison result. and means (31) provided on, (d) the stored digital address War Admiral the preceding signal, and means (220) to be detected at that station, M, E _1, E ₂ E _n . A power line telephone extension system, characterized in that including means for identifying a signal transmitted over the transmission line between the station E _N. A system for communicating between stations on a transmission line at a subscriber's site where an information signal in Korea is transmitted by a radio frequency (RF) carrier over a power line and the RF carrier frequency band is received and the signal is detected by another station. In (a) means for reducing the effect of interfering with the RF carrier frequency in the same band from other sources calling the same transmission line, (a) is provided in the TX station to control the power of the RF carrier over the power line. Means 31 and (b) means 222 provided in the RX station for controlling the threshold of the received RF carrier power to detect the carried signal, thereby preventing interference interference RF carrier frequency that is at or below the threshold level. Power supply telephone extension system, characterized in that is not detected at the RX station. 31. The apparatus of claim 30, further comprising: (a) means provided to the TX station to generate a digital address word consisting of several binary bits, temporally preceding the signal to be transmitted and representing one of the stations, and adding to the signal to be transmitted; (31), means (b) for causing the digital address word followed by the signal (b) to modulate the RF carrier frequency to infiltrate the power line in the TX station, and (c) the same digital address word Detects the digital address word from the received RF carrier, compares the detected digital address word with the stored digital address word, and transmits to the RX station to control detection of the received signal according to the comparison result. Means (31), and (d) means (220) for ensuring that only the signal preceding the stored digital address word is detected at the RX station. Expansion system. 14. The power line telephone expansion system according to claim 13, wherein thermistors 66M are arranged in parallel at both ends of the primary side of the MRX-TX transformer 61M so as to maintain low impedance at the primary side when the main transmitter is turned off. .

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