JPS6180940A - Data transmission system - Google Patents

Abstract

PURPOSE:To connect a telephone set, too, by only one set of transmission line consisting of two wires by providing a synchronizing signal generating circuit on a master controller,and providing a transmitting and receiving circuit for synchronizing with its synchronizing signal, on other device. CONSTITUTION:In case when a telephone from the outdoors has been received, its signal is sent to a digital circuit terminating equipment (DSU)5 through a subscriber's line 8, also converted to a signal formation as shown in the figure after a synchronizing signal and a control signal have been applied by a master controller 2, and sent out to a two-wire home bus 1. A telephone use interface unit 4 receives this signal and sends it to a digital telephone 7. Also, a panel for controlling an electric apparatus is provided on the master controller 2, the control signal is transmitted, an interface unit 3 for the electric apparatus receives it, and an electric apparatus 6 such as an air conditioner, etc. is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a data transmission system, and is particularly suitable for transmitting voice of a telephone or the like together with other control signals.

[Background of the invention]

As products with built-in micro combinators become more popular, various electrical devices in the home are connected to each other and centralized I
The so-called home autometer 1n.
Various systems have been proposed. One of them is K.E.
C (Kansai Electronic Industry Upgrade Center) has announced a standard alternative plan for the home bus system (HBS). this is,
Murata, Namekawa %F, document number 5C-83-41, System Field Control Study Group, Institute of Electrical Engineers of Japan, September 30, 1983
1'-HB8 (Home Bus System)".

Regarding the interface for connecting digital telephones (hereinafter referred to as "Digital Raiwa"), please refer to the "Reference Book for Private Home Equipment/Network Interfaces in Model Systems" published by Nippon Telegraph and Telephone Corporation in May 1981. It is detailed in the 2nd edition).

Now, KEC's HBS method mentioned earlier has a transmission speed of 9
．． In contrast to the two-wire type, which is an asynchronous system with a rate of 6 bits/second, digital telephones use voice information at 64 bits/second, control signals at 8 bits/second, and frame synchronization signals at 8 bits/second. Since the seconds are multiplexed and transmitted, the transmission speed is 80
bits per second. Furthermore, digital telephones have independent transmission lines (referred to as T@) and reception lines (referred to as R lines).
Because it is a wire system (2 sets of 2 wires), KEC's H
It is not possible to connect digital episode 11 directly to B8. In other words, the KECOHBS system does not take into consideration the connection of digital telephones.

It is also conceivable to construct a home bus system using the digital telephone interface, but in this case it would be a four-wire system, resulting in an expensive system.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art and to provide a data transmission system that allows connection of two pen-talk machines using only one set of two-wire transmission paths.

[Summary of the invention]

The gist of the present invention is that in a data transmission method of a data transmission system using one set of two-wire transmission lines, a master controller generates a synchronization signal generation circuit, and other devices generate control signals and audio signals in synchronization with the synchronization signal. It has a transmitting/receiving circuit for transmitting and receiving, and transmits signals in units of frames consisting of one or more synchronization channels, one or more control channels, and two or more voice channels.

[Invention 0 Embodiment 1]j Hereinafter, the present invention will be described in detail based on Examples. FIG. 1 is a diagram showing an example of a signal format in the data transmission system of the present invention. As shown in the figure, this data transmission method is a method in which, for example, a frame having four channels is transmitted as one unit.

The frame shown in FIG.
two audio channels of the audio signal to the S U, and
It is composed of a total of four control channels having control signals for controlling digital telephones and various TFI devices. In the first half of the frame, the period of the first half of the frame, that is, the period of the synchronization channel and the control channel, must be used for processing the transmission signal itself, but the voice signal of the voice channel in the second half of the frame ( , as will be detailed later, requires almost no processing other than speed conversion, so this audio channel period can be used for processing according to the control signal (for example, arithmetic processing of the control signal, etc.). In the present invention, the audio signal of the audio channel means the signal of the audio itself from the Lightning 1 phone.The control signal of the control channel means a signal for controlling the operation of a telephone or electrical equipment.

FIG. 2 shows an example of the outline of a home bus system using the data transmission method of the present invention. In the figure,
1 is a two-wire transmission line (hereinafter referred to as a home bus) using the data transmission method of the present invention, 2 is a master controller, and 3 is an interface unit for electrical equipment (such as an air conditioner) (hereinafter referred to as an electric '96 (referred to as IFU)
, 4 is a digital town talk interface unit (hereinafter referred to as telephone IFU), 5 is a DSU (Digital
6 is an electric device, 7 is a digital telephone, and 8 is a telephone subscriber line. v4 from outside. When an incoming call is received, the signal is sent to the subscriber line 8]4 and then to the DSU5.
and further sent by the master controller 2 to the first
The signal is converted into the signal format shown in the figure and sent to the home bus 1. The telephone IFU 4 converts this signal into a digital signal and sends it to the digital telephone 7, thereby establishing a connection.

When making a call outdoors from the digital telephone 7, the opposite is true. In addition, when requesting such a call,
The audio signal from the DSU 5 to the digital telephone 7 uses the audio channel (1) in FIG. 1, the audio signal from the digital phone 7 to the DSU 5 uses the audio channel (2) in FIG. 7 is transmitted on the home bus 1 using the control channel.

The master controller 2 is also equipped with an electrical equipment control panel, which is used to transmit control signals for electrical equipment over the home bus 1 via the control channel shown in FIG. can receive this signal and control the electrical equipment 6. The electrical equipment 6 can be controlled not only by the master controller 2 but also by telephone, or by connecting a dedicated controller for electric heater control to the home bus 1.

Next, the master controller 2, IFU 3 for electrical equipment,
'The specific circuit configuration of the Ft talk IFU 4 will be explained.

Figure 3 (This is a block diagram showing the circuit configuration of the master controller 20. In the figure, 9 is a DSU interface circuit, 10 is a PLL, (Phase
Locked Loop ) circuit, 11 is various clock generation circuits, 12 is a synchronization signal generation circuit, 13 is a speed conversion circuit, 14 is a drive circuit to the home bus 1, 15 is m
Control control Chigi channel I11 control circuit, 16 is control signal collision I
j# circuit, 17 is a speed conversion circuit, 18 is a channel separation circuit, 19 is a receive circuit for the home bus 1, 2 (H is an arithmetic unit that controls the entire master controller 2 (hereinafter referred to as
21 is a signal line to DS (J).

1) Simply explain the operation. In the data transmission system according to the present invention as shown in FIG.
Since it consists of two channels, its transmission speed is the transmission speed of the audio signal output from the DSU (usually 6
4 bits per second). Since the continuous transmission of audio signals output from this DSU is not necessarily constant due to the influence of the 710 person line signal, etc., it is necessary to make the transmission speed on the home bus 1 follow this change. A 100PLL circuit performs this. This PL
Based on the signal output from the L circuit 10, the clock generation circuit 11 generates various clocks β. A synchronization signal is generated from the clock generated here by the synchronization 1 word generation circuit 12, and is outputted to the synchronization channel on the home bus 1 (see FIG. 1) through the drive circuit 14. This synchronization signal is always output regardless of the presence or absence of audio signals or control signals, and is used to maintain synchronization of the entire system. The signal sent from DSU is IJ8U
Only the audio signal is taken out by the interface circuit 9, and after being speed-converted to four times the frequency by the speed conversion circuit 13, it is outputted to the audio channel (1) on the home bus 1 (see Figure 1) through the drive circuit 14. . On the other hand, since the audio signal from the digital telephone is sent to the audio channel (2) on the home bus 1, only this signal is extracted by the channel separation circuit 18 and sent to the speed conversion circuit 1.
1/4 times the frequency (i.e. the original frequency) by 7
After speed conversion, the signal is sent to the DSU interface circuit 9. Roughly speaking, the channel separation circuit separates the control signal in the control channel from among the signals received by the receive circuit 19 from the home bus 1, and sends it to the collision control circuit 16 and the control circuit 15 for the control channel. The collision control circuit 16 performs arbitration when control signals are simultaneously sent to the control channel on the home bus 1 from a plurality of devices.

The control signal sent to the control circuit 15 of the control channel and D
Control signals sent from the SU to the DSU interface circuit 9 are decoded and processed by the CPO 20.

Next, FIG. 4 shows a block diagram showing one example of the IFU 3 for electrical equipment. In the figure, 22
23 is a control channel control circuit; 24 is a collision control circuit; 25 is a drive circuit;
26 is a receive circuit, 27 is a PLL circuit, 28 is a synchronization signal detection circuit, 29 is a clock generation circuit, 30 is a channel separation circuit that extracts only the control channel, 31 is a CPU,
32 is an electrical and electrical equipment control line.

The electrical equipment interface unit 3 receives the synchronization signal sent from the master controller 2, and
The circuit 27 and the synchronization signal detection circuit 28 establish bit synchronization and frame synchronization, and the clock generation circuit 29 generates various types of locks as necessary. Then, in the electronic device interface unit 3, only the control signal of the control channel is extracted by the channel separation circuit 30. The CPU 31 decodes the control signal through the control channel control circuit 23 and controls the electrical equipment through the electrical equipment interface circuit 22.

Figure 5 is a block (9) showing an example of IFU 401 for telephone.
It is. In the figure, 33 is a digital telephone ink-face circuit, 34 is a speed conversion circuit, 35 is a drive circuit, 36 is a receive circuit, 37 is a PLL circuit, 38 is a synchronization signal detection circuit, 39 is a clock generation circuit, and 40 is a channel separation circuit. Circuit, 41 (Z collision control circuit, 42 is 11m channel I control circuit, 43 is speed conversion circuit, 44 is CPU
, 45 are signal lines to the digital telephone.

The synchronization signal transmitted from the master controller 2 is received, the PLL circuit 37 and the synchronization signal detection circuit 38 establish bit synchronization and frame synchronization, and the clock generation circuit 39 generates various necessary locks. , is similar to the electrical equipment interface unit 3. In addition, the channel separation circuit 40 takes out the voice channel and the control channel separately, the voice signal passes through the speed conversion circuits 34 and 43, the control signal passes through the control circuit 42 and the CPU 44, and the digital telephone interface circuit 33 and the home bus 1. This means that we will be communicating with each other.

Next, a specific example of the configuration of the home bus 1 with one set of two wires is shown in FIGS. 6 and 7. FIG. 6 shows a method using collector coupling of transistors. In the figure, 46 and 47 are drive circuits, 48 and 49 are receive circuits, 50 and 51 are transistors, and 52 is a resistor. In this case, 101 two-wire home buses are connected to the collector, and the other becomes a ground wire, using a coaxial cable or the like.

Figure 7 shows a method using transformer coupling, in which 53
and 54 are drive circuits, 55 and 56 are receive circuits, 5
7 and 58 are transformers. In this case, each home bus 1 is coupled to a transformer, resulting in so-called balanced transmission, using twisted pair wires or the like.

In addition, Fig. 8 shows the case where an optical fiber is used as a transmission line, and in the figure, 59 and 60 are drive circuits, 61 and 62
63 is a receiving circuit, 63 is an optical fiber, 64 and 65 are light emitting elements having different emission wavelengths, and 66 and 67 are light receiving elements.

In this case, the transmission line may be one optical fiber, one line and one set, but it goes without saying that the present invention is applicable even in that case.

Now, in the above explanation, one frame has only two audio channels, but it does not matter if there are many audio channels. For example, as shown in FIG. 9, by waiting for six audio channels in one frame and using two channels in combination, it is possible to incorporate three lines onto the home bus. Further, in FIG. 1, a control channel is provided immediately after the synchronization channel in order to lengthen the internal processing period, but this control channel may be located anywhere as shown in FIG. 9. Furthermore, the control channel is 1
The number is not limited to one in a frame, and there may be two or more. Furthermore, in FIGS. 1 and 9, the respective channel lengths are shown to be equal (e.g., 8 bits per channel);
It does not matter if the respective channel lengths are different. FIG. 10 shows an example of this. Further, FIG. 11 shows an example of application to a so-called asynchronous type in which a start bit and a stop bit are used as synchronization signals. In this case, the start bit and stop bit correspond to a synchronization channel.

As described above, the present invention can take various forms in a data transmission system having one set of two-wire transmission paths, but basically, the master controller controls the synchronization signal generation circuit, and other devices control the synchronization signal generation circuit. It has a transmitting/receiving circuit that transmits and receives control signals and audio signals in synchronization with the signal, and transmits signals in units of frames consisting of one or more synchronization channels, one or more control channels, and two or more audio channels. It is a data transmission method.

〔Effect of the invention〕

According to the present invention, a new effect can be produced in that audio-related devices such as telephones can be connected with a data transmission system using one set of two-wire transmission paths.

[Brief explanation of drawings]

1 and 8 are diagrams showing an example of a frame structure in the data transmission system according to the present invention, FIG. 2 is a diagram showing an example of a home bus system using the present invention, and FIG. ,
A block diagram of the master controller, Figure 4 is a block diagram of an interface unit for electrical equipment, Figure 5 is a block diagram of an interface unit for a digital telephone, and Figures 6 to S show an example of a home bus. Figure,
FIGS. 9 to 1θ are diagrams showing other examples of frame configurations according to the present invention. 1.Home bus 2.Master controller 3.Electrical equipment interface unit 4.
Digital telephone interface unit 5...DSU 6...Electrical equipment 7...Digital collection 1 episode 9th ward'! 510 Figure 11 Figure procedure amendment (method) Indication of the case 1982 Patent Application No. 201627 Name of the invention Data transmission system amendment person 11f1 and σ Penalty C patent applicant name Kui 15101 Stock Company 2t Hitachi
Manufacture Cost Management Subject of person's amendment Contents of amendment in the brief explanation of drawings in the specification "Figure 9 1 to 1
"Figure 0" is corrected to "Figures 9 to 11."

Claims (1)

[Claims] 1. In a data transmission system in a transmission system in which a plurality of devices are connected by at least one set of common transmission paths, one of the devices includes a synchronization signal generation circuit that generates a synchronization signal and a synchronization signal generation circuit that generates a synchronization signal. The other device has at least a transmitting circuit that outputs a synchronizing signal to a synchronizing channel, and the other device has at least a transmitting and receiving circuit that transmits and receives a control signal and an audio signal in synchronization with the synchronizing signal, and the other device has at least a transmitting/receiving circuit that transmits and receives a control signal and an audio signal in synchronization with the synchronizing signal. A data transmission method characterized in that signals are transmitted in units of frames, each consisting of a synchronization channel, one or more control channels, and two or more audio channels. 2. The data transmission system according to claim 1, wherein the signal of the voice channel is a voice signal of a telephone. 3. The data transmission system according to claim 1 or 2, wherein the device having the synchronization signal generation circuit is connected to a digital line termination device.