JPS605696A - Voice communication system - Google Patents

Abstract

PURPOSE:To prevent generations of howling by transmitting a PCM signal of analog zero level to an opposite talking channel of a channel during talking returend without accessing when the said talking channel exists. CONSTITUTION:Talking is conducted between both voice terminals 3a and 3b and talking channels CHi, CHj are assigned to talking devices 2a and 2b respectively. Suppose that the device 2a is faulty and it is impossible to provide an analog signal A from the terminal device 3a to the channel CHi and to transmit the result to a transmission line 1b. Since the device 2b is in operation normally, when the channel CHj reaches the device 2b, a data bit of the channel CHj is fetched and a signal Y of analog-converted ''0'' level is outputted to the terminal device 3b. Further, an analog voice signal B from the terminal device 3b is pulse-code-modulated into a PCM voice signal B1, which is provided on the CHj and a control region CNT is transmitted to a transmission line 1c with logical ''1'' level.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a voice communication system in which 0y and several L voice terminals are connected to each other by a transmission path to y, and 518) are spoken between arbitrary B voice terminals. It is something.

Conventionally, this persimmon sounds y! j Pig as a communication system, 2I81
There was something shown in the figure. Figure 1 shows the conventional sound 7';ij
j I-.

FIG. 2 is an explanatory diagram showing an operation mode of the system. In 1.1, lal lbl lc, 1e4y iH transmission line, 2
a + 2 b etc. rD2B communication equipment fi'j,, J a
z 31) (￥) 3 is a voice terminal, 4 is a center device, 5 is a frame 15, CUs such as Cl11°CHj are call channels, lotgo) 17j #+ A communication channel that is a pair of layer 11 C)l When exchanging the contents of , it is a 5-way split switch.

Fig. 2μ, F1 applied to the voice communication system of Fig. 1
FIG. 2 is a configuration diagram without showing the . In the figure, 8YNB synchronization pattern, SIG are common signal channels that send signals for controlling connection, disconnection, etc., CI, , CHi,
CHs such as C-j and CHn are communication channels, Do-
J) 7 is the data bit of the PCM audio signal.

Frame/, 5 circulates through transmission path 1 shown in Figure 1 at a cycle of 125 micro/second, and frame 5PU (v
1tty) Call channel C) 1t, 7.8 hits (bi
t), tL1 is formed at °C. Tsumashi, each communication device P]
12 exchange 64 Kbps CP CM audio signals.

Next, the manner in which voice exchange is performed in the conventional fN voice communication system shown in FIG. 1 will be briefly described.

In FIG. 1, for convenience of explanation, it is assumed that there is a conversation between the sound T3 terminal 3a and the voice terminal 3b, and 7i
Therefore, it is assumed that communication channels CHi and C11j are assigned to the communication devices 2a and 2b for this communication, respectively.As shown in FIG. 1, A and B are each 1A voice terminals. 3a and 3b output ant log sound or signal, and
A, , B are the PCM audio signals of each analog audio signal A and B, 1. Assigned to the communication device 2a, I'>, t]-
When the communication channel C [j]1-i is input through the transmission line 1a, the contents of the communication channel C [4i, a beeping sound 7!1 t::A end 3b P(:]ゝj Audio i ζi issue B
, import, original) for analog sound, restore it to IL5B, and output it to the audio terminal 3ai. Furthermore, the voice terminal 3a
I-I CM of freelog audio signal A from l'
The CM audio signal A is sent to the transmission line 1F via the communication channel C.

■ The same goes for call numbers 1j and 2b.
g))' Take in the commercial audio signal A1 and convert it to the original array.
It is restored to the log audio signal A and outputted at the end of the sound 74, 3h.

Furthermore, the audio terminal 3bC outputs one analog audio signal 13 to one audio signal 33. The signal T1h is multiplied by the old torque C11j and sent to the transmission line IC.

■ ゛Hint device ffr, 4-CI'; J,,-Hit
iJI R1-7-1”f, /L-(lJi,!:
When CHj arrives at the destination of transmission line lei, center point 11f4
The time division switch 10 in the
Intersect each PCM audio signal A, and B1 within C1 and C1.
Negative. That is, the PCM audio signal A+U on the communication channel C11i is transferred to the communication channel CHj, and the PCM audio signal B, which was on the communication channel (Jlj), is transferred to the communication channel CHi and transmitted to the transmission path 1a. Sent out.

By repeating the operations of (1) to (2) above, a call is made between the two voice terminals 3a and 3b.

Since the conventional voice communication system operates as described above, for example, if the communication device 2a breaks down, the communication channel CH1 cannot be loaded with the PCM audio signal A+ of the voice terminal 3a, and the input state from the transmission path 1a changes. If the audio terminal 3bK outputs the audio signal directly to the transmission path 1b, the audio signal outputted by itself will be sent to the audio terminal 3bK again at F, which has the disadvantage of causing howling. Ta.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and uses a plurality of communication devices connected together with a center device to a common transmission path, and a plurality of communication channels transmitted on the transmission path. In a voice communication system receiving a telephone call between arbitrary communication devices, each of the above mentioned; I) When transmitting the CM double signal, the center device simultaneously sets the control area of the communication channel to logic 10 and sends it to the transmission path; , if the control field 75 of the communication channel being used for a call returns with logic "0", the information carried in the call channel is discarded, and the corresponding party's call is returned. An analog zero-level PCM signal is placed on the communication channel assigned to the device and sent to the transmission path L8, and
If the control area of the communication channel returns with logic 11, then the information returned in the communication channel is transferred to the communication channel assigned to the paired communication device diagram. 11.1) - A voice communication system that prevents the occurrence of zero ringing and enables monitoring of the operation of each communication device during a call. , an embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a structural diagram showing a frame applied to a voice communication system according to an embodiment of the present invention.

In the figure, 6 indicates a frame, and this frame 6 is
a common line signal channel SIG, which sends signals for controlling the synchronization pattern SYN, connection, disconnection, etc., and C1l;
, CHi, CHj, CHn, and the like. Each communication channel CH carries the ff1lI control area CNT and the PCM audio signal.
Bit data bit D. -D. This data transmission (Do-D7) is the same as the communication channel CH in the conventional frame 5 shown in FIG. 2 described above.

In the frame applied to the voice communication system of the present invention, by providing a control area CNT for each communication channel CH, it is possible for the communication device 2 during a communication to access the communication channel CH that was not allocated. New PCM audio signal 'ff:
When loading, at the same time the control area CN of this communication channel CH
Turn T into a logical month and send it to transmission line l. Center device 4
Then, control area CN' of all communication channels Ctt
I' is set to logic "0" and sent to transmission line 1.

When the V voice communication system according to the present invention is operating properly, the following points are excluded (and) (basically, the conventional voice communication system shown in FIG. 1 above) Since the operation is similar to that of the system, a detailed explanation will be omitted.

(a) Each telephone device 2 in the middle of a telephone call transmits a voice signal to the communication channel C [I which is set to be blank, P t, 'M i, and the corresponding communication channel C) (1liI control area Cj). , 'i' is set to logic '1'.

(b) Center device R41:J: Checks whether the control area CNT of the call channel CH used for the call in the returned frame 6 is logic 1-IJ fr/Logic "0".
Roast it.

(C) When sending to the transmission path 1, the center device 4 sets all communication channels CHtv control f11/a area C1#i'' to logic 1'OJ.

The fourth part is an explanatory diagram showing the operation mode of the voice communication 13 system which is one implementation '611 of the present invention, pp, 1 i'-
〈l〉：The same code is used to indicate the same part, and it means dust, death, etc. A detailed explanation will be omitted. Figure 4 shows G.Eng.
During a call, one of the telephone equipment ft2 malfunctions and the transmission line 4 of the own station's voice terminal 3 is not sent to the transmission line 1. 11 to call channel C) (control F11 area CI'l T contents W+,!
12 is a 1' analog zero level I) C
The PCM 111 generator 13 that generates the M signal receives either the output of the PCM jH signal generator 12 or the PCM of the received 2JO channel CI as an input to the time division switch 10.
A selector 14 for selecting whether it is an audio signal or the like is incremented when the phrase 11 area CNT of the call channel OH in use for a call returns as logic "0", and decrements when it returns as logic "1-1". This is a counting circuit that determines that the communication device 2 to which the corresponding communication channel V channel CH is assigned is malfunctioning when the value of this counter exceeds a certain value. . f
(In the embodiment shown in Figure '74, both audio terminals 3a and 31)
Therefore, each telephone device j4
2 d and 2b・Taniya call channel CH7 and CHj force・
I'll also do the assignment + tiring. Now, the communication device Shini 7
Suppose that the audio terminals 3a and 7Jh are unable to send analog voice messages to the transmission line 1b on the communication channels CH1. explain.

(4-) Even though the communication channel CHi assigned to the own station is input to the communication device 2a through the transmission line 1a, due to a malfunction, the analog Ondo fn No. A of the voice terminal 3a is switched to PCM.
(The input contents are sent to the transmission line 1b as they are.)

■ Since the communication device 2b is operating normally, when the communication channel CHj reaches this communication device 2b, the data bits 1) 0 to Dtt of the communication channel CHj are received, and the analog signal of the zero level is converted into an analog signal. Output Y to the audio terminal 3b. Further, a PCM audio signal Btt obtained by converting the analog audio signal B from the audio terminal 3b into PCM is placed on the above communication channel CHj, and the control area CN
'l' is set to logic 1'lJ and sent to the transmission path 1c.

■ In the center device 4, when the communication channels CI-1i and CHj arrive, the center device 4 transmits the communication channels C11i and CHj.
The circuit 1 determines whether the control region CNT of j is logic “1” or not.
11C, I check. Since the control area CN T' of the communication channel CHi is logic 10, the data bits]), , D of the communication channel CHi are discarded, and the output t of the analog zero level PCM signal generator 12 and the selector 13 are The information is input to the time division switch 10 via money. Since the control area CNT of the communication channel CHj is logical 1-month, the time division switch 10 controls the PCM voice signal B on the data bits Do to D of the communication channel CHj.
1 and analog zero level PCM signal signal color 1 is exchanged. In other words, the communication channel CHi carries the PCM audio signal tone, and the communication channel CHj carries the analog zero level P.
CM signal Y+'f! : Both call channels CHi and C
The control P1 area CNT of I(j is set to logic 0.1 and sent to the transmission path IR. At this time, the counting circuit 14 counts the number of times the control area CNT of communication channel CHi returns with logic rOJ. When this counting circuit 14 detects a call channel CH that is being used for a call whose count value exceeds a certain value, the call device 2 that is assigned to this call channel CH2 breaks down and the 7hi Judging that this is the case, perform the next round, make the next trip, report the malfunction, etc.

As described above, according to the sound 7-g communication system of the present invention, each of the communication channels during a call is assigned by the filling device υ"′L, etc."1. A control area is provided to indicate whether or not the call channel is being accessed in a coordinated manner.
C# I was monitoring the area of 1 ■ target 1 sparrow 11 in front of C#I, and when I returned to the US after playing the game, I found that there was a call channel in progress.
For the call channel that will be paired with the channel,
By transmitting all the PCM signals x and qti at the zero-level blog (sword) and using the 4T' as the castle, it is possible to effectively prevent the occurrence of l... ring, and the operation of each communication device 6 during a call can be effectively prevented. It has the feature of being able to perform monitoring. In addition, the center device can quickly detect failures of each communication device during negative operation without separately sending a patrol signal (for example, a normal voice sentence) as a 'fC' control signal for diagnosis of the back door communication system. , 1) It has the following effect that it can be easily detected.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the 'pt++ construction mode of a conventional voice communication system, FIG. 2 is a borrowed diagram showing a frame applied to the voice communication system of FIG. 1, and FIG. FIG. 4 is a diagram illustrating a frame applied to a voice communication system, which is an actual artillery array. In the figure, 1...transmission line, 2a such as l a -1e, etc.
, 2h etc. 2...Telephone device, 3a, 3b etc. 3...
Audio terminal, 4... Center device, 5.6... Frame 11.1°... Time division switch, 11... Discrimination circuit, 12...) CM signal generator, 13...・Selector, 14... RIR times p, 7, S Y N , , Synchronization pattern, S I G , , both>+fj (JV!
(IT No.-1 Yanel, (114,, CH4, CHj,
C1 of Cl envy etc. (,..., shopping channel, CNT...
・Control area, A, B,...analog r\7'' signal, A, , B,...PCM audio signal, N-...zero level analog signal, Y,...analog zero level l ) 1 signal to C. In the diagram, the same reference numerals indicate the same or corresponding parts. Procedure Amendment (voluntary) 11+'; , ILC i'1 display Patent application No. 58-113764
No. 2, Title of the invention Voice communication system: U, Representative of the person making the amendment] 11 Ren 8 part Agent 5, Subject of the amendment Persimmon in the "Detailed Description of the Invention" in Meisho 1. 6. Self-answer for amendment (1) Akira δ (II, No. 7 'jii, "Akushite" in line 16 is corrected to "Accessite". (2) Same book, page 8, line 20 The number "2" is corrected to "2a", and the number "3" is corrected to "3a".

Claims (1)

[Claims] A number of communication devices and at least one center device are connected in series in a ring through a common transmission path, and a synchronization pattern and a communication channel of multiple rχ are connected in series on the transmission path (1'j
In a voice communication system in which the frames that are partially arranged and missed are transmitted in a circular manner, and a call is made between arbitrary communication devices using the j telephone channels, a control area is assigned to each of the communication channels, When the communication function 11'C sends a new voice PCM signal to the communication channel during a call, it simultaneously sets the control area 011 to logic "1" and sends it to the transmission path, and the center device fX, ttQ, When the control area of the communication channel is set to convex logic "0" and sent to the transmission path -, and the control area of the communication channel being used for communication is returned as r) logic "0". 1.11 is assigned to the paired call ',': 17'f;
ITlf puts an analog zero-level PCM signal on the digital channel and sends it out to the transmission line, and also - Agency I communication channel color bait 1 'l' [912 goes to r! If it returns with IJJ', f:J:, Luck 11: on the corresponding call channel.
The voice communication system is characterized in that the received information is carried on a communication channel assigned to a paired communication device P1'' and transmitted to a transmission path.