JPS585073A - Conference calling method by loop transmission line - Google Patents

Abstract

PURPOSE:To simplify the constitution of an adder by providing an addition time slot and an addition time slot memory for conference calling transmission of time-division multiplex communication which uses a looped transmission line. CONSTITUTION:Plural remote stations RS and one master station MS are connected together by a looped transmission line 8, and a synchronizing pattern, at least two addition slots, and distribution slots are arrayed to constitute a frame. For transmission among attendants A-F at the RSs, signals are converted into digital signals by converters 52a-52f and then the 1st and 2nd addition time slots, the adders 4a-4f of the RSs, and the time slot memory 11 of the MS are used to perform addition arithmetic; and the arithmetic result is send out to the respective conference attendants with the distribution slots after analog signal conversion by converters 51a-51f. Addition time slots are provided as many as maximum conference attendants at one RS to simplify the constitution of the RS.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conference call method for transmitting a conference call using a time division multiplex communication method using a loop-shaped transmission path.

Conventionally, as a device of this type, there was one shown in 11th CI4:. In the figure, (1) is a master stage attack (hereinafter referred to as MS).
), (2) is a delay circuit of MS (1) circle. MS (1) Generation of tt frame synchronization pattern,
Configure and maintain the frame. (3aJ, (3b),
(3C) are remote stations (hereinafter abbreviated as R8), (4&n, (4b), (4e) are adders, (51m), (52m), (51b), (52
b) , (51e) and (52e) are each C0DEC
(coder-decod@r.

code and decoder), (61m), (62m), (61b
), (62b), (61e), and (62e) it are telephones, respectively.
, F are named. (7m), (7b)
, (7 and 8 are delay circuits, respectively, and (8) is a loop-shaped transmission line.

@Figure 2 is a format diagram showing an example of a signal frame transmitted by the loop-shaped transmission line (8) in Figure 1. While doing so, it goes around the top of the transmission line (8) seven times. Telephone (61m), (62m)-(61c)
, ($2c) bh la (D if voice M number ft C0
DIC(51&).

(52m) to (51e) and (520) are converted into digital signals, which are transmitted by the frame of FIG.
) * (52c) i: Telephone (61m) converted to analog signal, (62a) to (61c).

(62c). In addition, in a call at the same conference, there is no problem even if the voice signals from multiple telephones are combined 4g'tx, so the voice signals from multiple telephones are converted to digital signals and the converted digital signals [summation] The signals are added and transmitted by devices (4a) to (4c). Each R8 (3a), (3b), (3c) (2) The output of the telephone belonging to the own station is added to the addition slot (Fig. The contents of the addition slot after the addition kM8(1) are re-inserted into the distribution slot and sent out, and each R8 converts the contents of this distribution slot into an audio signal carrier and gives it to the telephone (2).

FIG. 3 is a block diagram showing the internal connections of R8.
8 have the same configuration, so R8 (3b) is shown in Figure 3.
The case is shown below. In FIG. 3, the same reference numerals μ as in FIG. 1 indicate the same parts, and (9b) and (10b) respectively
! I and the second adder circuit, P is the transmission end of the transmission line (8) in R8 (3b), and Q is also the transmission start end. Glv G! e G3 m G4 e G@v
G4 is a gate, and the opening timing of these gates is shown in Figure C.

Figure 4 is a timing diagram showing the typing of each gate shown in Figure 3.
, shows the timing of 7 frames in QA42, and
+ is an associated addition slot, X is an associated distribution slot, and -2 out of 7 frames are not shown. Figures (e) to (6) show opening timing 1 of gates G and -G6.

The contents of the addition slot X at point P are from G1 to the addition circuit (10
b) is added as one input of the telephone (61b).

The audio signal from (62b) is C0DEC (51b), (
52b) (:Yo digital signal view: converted G, and G are input to the adder circuit (9b) ζ: The output of the sum is added as the other input of the adder circuit (10b). The output of the device (4b) is at point P (
:Contents of addition slot
Signal from: Telephone C (61b), D (62b
) 1, 2□, ? knee t1. -1)
It will be input to EG4kmn・9, Yuo□keu, and YulotX. Game) G, t At the time of G, llp, the contents of the distribution slot X of point P are C0DEC (51b), (52b
)42 is converted into a voice signal and sent to the telephone (61b), (
62b) ζ Two people are forced.

FIG. 5 is an explanatory diagram showing the transmission of a conference call signal in conventional method 4: W! The same reference numerals as in Figure J1 indicate the same parts 1,
The addition slot X and the distribution slot X are time slots on a time division multiplex line, but for convenience of explanation, they are represented as separate transmission paths, as shown in X (8i) = x (82). Also ■, ■, @, 0. ■、■ is phone A, B, C
, D, and F are digitized, and + means addition of digital signals. M S (
When outputting from 1), the contents of X (81) are cleared and become 0, but the output of R8 (3m) ■+■+@+■+
(2), this signal is sent by 1 (82) in MS (1), and X (81) n is cleared again. By converting the contents of x(82) into an analog signal in each R8 and inputting it to each telephone set, each participant in the conference can hear the voices of all participants, and a conference call is realized.

Since the conventional device is configured as described above, when there are two telephones for conference participants in one R8, the adder becomes a three-person adder as shown in Fig. 3, and the number of telephones is The disadvantage is that as the number of inputs increases, the number of inputs to the adder increases and the structure of the adder becomes complicated. Furthermore, when a single adder circuit is used in a time-division manner to simplify the structure of the adder to perform multi-input addition, there is a drawback that line control becomes complicated.

This invention was made to eliminate the above-mentioned drawbacks of the conventional method, and an object of the present invention is to provide a conference call method that can be simplified using an adder for each R8.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be explained below with reference to the drawings.

FIG. 6 is a block diagram showing a simple embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and a indicates a time slot memory.

Also, Figure 2 is a diagram showing the internal connections of R8 in Figure 6, and since each R8 has a common configuration, Figure 7 shows the internal connections of R8 in Figure 6.
The case of R8 (3m) in the figure is shown.

In Figure 7 (:, the same reference numerals as in Figure 6 indicate the same or equivalent parts, and the adder (4a) is composed of a single addition circuit (9 elements). Figure 8 is shown in Figure 117 (= The timing diagram shows the timing tube of each gate, which is the same as No. 4 wJ in the figure.
Letters or identical symbols have the same meaning, and X is! 1 addition slot, Y is! ! 2 addition slots, x is 11!1 distribution slots, and y is lR2 distribution slots. Again lol
Figure c9 is an explanatory diagram showing the transmission of a conference call signal in the device C shown in Figure 6.11! The same symbols as in Figure 5 indicate the same parts, and the same characters or symbols as in Figure 5 have the same meanings. shall be taken as a thing.

The addition slots X, Y and the distribution slots X e Y are time slots on a time division multiplex line, but for convenience of explanation, they are shown as separate transmission paths, X (81), x (82).
.

They are expressed as Y (83) and F (84).

Next 6: 4 operations when telephones A, B, C, D, g, and F participate in the same conference. In this case, the same -
Since the maximum number of telephones participating in conference C2 from BS is 2, there are two sets of addition slots t-x and Y, and distribution slot f.
Two sets of x and y have been prepared, but the number of addition slots and the number of distribution slots to be prepared can be determined according to the maximum number of participating telephones.

MS (tit: addition slot x (81) t-
Clear T.

and send it. Addition slot X (81) with R8 (3a)
Add ■ to the contents of , and at the output point of R8 (3m)
The content of 1) is ■. In this case, since addition is performed by two people, the adder (4a) only needs to include the adder circuit (9a). At the output point of R8 (3c), the content of X (81) becomes ■+O+■, which is MS
(1) Two people are required to input the contents of X(81) using time slot memory Ql)t- in MS(1).
3, clear the contents of X (81), and send. On the other hand, the content of Y(83) is MS(1
) is output. This is input to the adder (4a) from R8 (3m) (assuming that it is input, at the timing of addition slot X in Fig. 8 (a)) G, , G, and Open 04 at the timing of X and set it as ■ due to the contents of 8υ.

Also, at the timing of addition slot Y in Figure 8 ((turn)), the adder (4m) is inserted from gates G1 and G.
At the timing of addition slot Y in Figure 8, the output of the G4t-open adder (4a) becomes the content of Y (83). Since the addition in this case is also an addition by two people, a single addition circuit (9& ] Therefore, R8 (3m)
At the output point 8=, the content of X(81) becomes ■, and Y(
The content of 83) is ■＋■＋◎10. However, Y (83)
■, ■, ■ of the contents are the contents l frames before. R8
(3b).

Similar processing is performed for (3C), and the content of line Y (83) at the input point of MS (1) becomes ■10■ + O10 + ■ + [F], and now all the audio signals of the conference participants are The addition was successful (= becomes. MS (1) is the time slot memory (11
) to calculate the content t x (82) of Y (83),
'! (84) (: Input, cursor X (81) 17) Contents u-Y (83) l: Input L, X81) t-/Rear and send. Each R8 (3a), (3b), and (3e) receives the content of x(82)(7) or the content of y(84), converts it into an audio signal, and sends it to each participant. To realize a conference call tube so that everyone's voice can be heard.

(= In the example explained, two distribution slots are used, but this can be either one of x (82) or y (84). In the system shown in Figure 6, simultaneous ships = 2 For example, the participating phones in the first conference are A, C, and E, and the participating phones in the second conference are B, D, and D.
If F, two distribution slots a, x (82) and y (84) are required, so all telephones A, B, C, D,
Even when g and F participate in the same conference, the distribution slots for both x (82) and y (84) are divided as shown in Figure 9.
The same information may be sent.

As described above, according to the present invention, the number of addition slots equal to the maximum number of telephones participating in the conference that can be accommodated is provided, and connections are made using the time slots of this addition slot 'tM8. This configuration has the effect of simplifying the adder configuration in R8.Also, when integrating multiple conference calls into one conference, it can be achieved by simply controlling the time slot memory of the MS, so the control It has the effect of becoming simple (:).

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional device, FIG. 2 is a format diagram showing an example of a signal frame transmitted by the loop-shaped transmission path shown in FIG. 1, and FIG. A block diagram showing internal connections, Fig. 4 is a timing diagram showing the timing of each gate shown in Fig. 3, Fig. 5 is an explanatory diagram showing an example of a conventional method, and Fig. 6 is an example of an embodiment of the present invention. The block diagram shown, Il! Figure 7μ is a block diagram showing the internal connections of the remote station in Figure 6, wIB is a timing diagram showing the timing of each gate shown in Figure 7, and Figure 9 is an explanatory diagram showing an embodiment of the method of the present invention. It is. (11---ff Star Station (MS), (3m)
, (3b). (3e) ---respectively remote station (R8)
. (4m), (,4b) = (4c)--one respective adder, (514). (52a), (51b), (52b), (51c), (
52e) ---one each C0DEC, (61m), (
62m), (61b), (62b), (61c), (6
2c)-m-telephone, (7a), (7b), (
7e)---Respectively delay circuit, (s)---loop-shaped transmission line, mataυ---time slot memory. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Shin Kuzuno - (o) (1)) (d) CD Figure 4 6

Claims (1)

[Claims] A time division multiplex communication method in which one remote station and one master station are connected in a loop through a loop-shaped transmission line, and a synchronization pattern, at least two addition slots, and a distribution slot are connected in a loop. Configure the frame by arranging the
This frame is circulated through the loop-shaped transmission path to the remote station ζ under the control of the master station. Two remote stations 12 jRl meetings - participants' outgoing audio digital signals (= convert this digital signal,
It/(Collect No. 1) The addition slot of Ill visits the remote station and adds to the content of the addition slot of Ill at time 9, and the step of adding the contents of the addition slot of Ill to the master station, and The contents of the first addition slot are sent to the second addition slot (by two people, the first addition slot is cleared and sent), and one remote station (
= Convert the transmission of a certain second conference participant into a digital signal, and the amount of this digital signal The second addition slot has made two rounds of the remote station ζ, and when the content of the second addition slot ζ is good, the content of the second addition slot ζ is added. and inputting the contents of the second addition slot into the pipe distribution slot when the second addition slot circulates in the master station, and inputting the contents of the first addition slot into the second addition slot. and a step of converting and receiving the content of the distribution slot at the time when the distribution slot circulates to the remote station where the conference participant is present. Loop transmission line characterized by
Two ways to make a conference call.