JPS6024575A - Group communication equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a group communication device suitable for use, for example, in group language education.

Background technology and its problems Traditionally, language laboratories (LanguageLa
A group language teaching device called a ``boratory'' (
(hereinafter referred to as LL) is known. In this LL education, multiple students enter their respective booths and
A human teacher operates a control desk and uses information equipment such as a tape recorder to proceed with the lesson according to an appropriate program. The necessary equipment is installed so that all instructions from the teacher and responses from the students are transmitted through each person's microphone and headphone.

By the way, in language education using LL, it is desirable to be able to practice not only teacher-to-student learning (but also student-to-student conversation), and in conventional LL, it is desirable to be able to practice conversations in pairs between two adjacent booths. All the booths were divided into several groups, with lines placed between each booth within the group.

Therefore, in conventional LL, it is virtually impossible for any student to form a pair or group and have a conversation. Ta.

OBJECTS OF THE INVENTION In view of this point, an object of the present invention is to provide a collective communication device that allows conversation and communication within any pair or group within a group.

SUMMARY OF THE INVENTION The present invention comprises a sequential switching transmission means for sequentially switching and transmitting a plurality of audio signals corresponding to a plurality of speakers at predetermined time intervals, and a system for selectively transmitting the output of the sequential switching transmission means to a plurality of receivers. The selection and allocation means includes a receiver designation means for designating a specific speaker, and a timing designation means for designating the transmission timing of the sequential switching transmission means corresponding to the specific speaker. A collective communication device having
Everyone in the group can form arbitrary pairs or groups and talk freely with each other without using complicated equipment.

Embodiment Hereinafter, an embodiment in which the collective communication device of the present invention is applied to a LL will be described with reference to the drawings.

The configuration of this example is shown in FIG. In this FIG. 1, a plurality of students 8a, Sb, 8c... and a teacher "r J
The audio signal system for /c has the same configuration, so a, b, c... and t are added to each code to indicate student and teacher use, respectively. Therefore, the configuration corresponding to the student 8a will be explained as a representative example.

In FIG. 1, (1a) indicates a microphone, and this microphone (la) is connected to the input side of an amplifier (2a) in the booth. (3a) shows the monitor gate in the leg adjustment table, and the amplifier (2a) is connected via this monitor gate (3a).
The output side of is connected to the audio signal bus (4). (5) indicates an interference prevention gate, and the audio signal bus (4) is grounded through this interference prevention gate (5). (6a) indicates a speech gate, via which the low-pass filter (7a) is connected to the audio signal bus (4). (8a)
indicates a line amplifier, a low-pass filter (7a) is connected to the input side of this line amplifier (8a), and a line amplifier (8a) is connected to the input side of the line amplifier (8a).
) to the headphones (9a) in the booth.

(1 (I indicates a pulse generator, and this pulse generator is connected to a concave counter (divider) aD. a'a, a3
1 and I respectively indicate a decoder, a RAM for communication, and a comparator, and these decoders Q21 and RAM (13
) and one input terminal of the compass 0 are connected to each output terminal of the counter aυ. In addition, each output terminal of decoder az is connected to each monitor gate (3a),
(ab) = (ac) to (3t) are connected respectively, and each data terminal of RAM (13) is connected to each communication gate (6a), (6b).

(6C) to (6t), respectively. Further, the 1/2 frequency dividing terminal of the counter α9 is connected to the interference prevention gate (5). a9 and (161 indicate interfaces for write address and write data, respectively; each output terminal of the write address interface (c) with is connected to the other input terminal of comparator I, and Each output terminal of the interface +161 is connected to each data terminal of the RAM (131). aD is the central processing unit (hereinafter referred to as CP).
The CPU Qη of and the input terminals of both interfaces a9 and (161) are connected.

The cod indicates an AND circuit, one input terminal of this AND circuit Q8 is connected to the pulse generator (111), and the other input terminal is connected to the coincidence output terminal of the comparator I.The output of the AND circuit (18) The terminal is connected to the write control terminal of RAM (13).

The operation of this example is as follows. As shown in Figure 1, 1
In this example, the audio signal system for each person is monitored by the monitor game) (3a) to (3t) and the call gate (6a).
~(6t), and the opening and closing of each of these gates is controlled to form a required signal path.

First, the opening/closing control of the monitor gates (3a) to (3t) will be explained with reference to FIGS. 1 and 2. Counter 0 divides the repetition frequency of the pulse generated by the pulse generator (11) and supplies it to decoder 0, and decoder (lz
Scanning pulses (the first three waveforms are shown in FIG. 2, A, B, and C) having the same frequency and different phases by a predetermined amount are generated at each output terminal of the . The decoder az sends this scanning pulse to each monitor gate (3a).

(3b), (3C)...K is supplied sequentially to open and close each gate at a predetermined repetition period. These monitor gates (3a), (3b), (3c)--... have corresponding microphones (la), (lb), (lc).
)...and amplifiers (2a), (2b),
(2c) Students 8a, Sb, S through , , , ,
The audio signal produced by c++-we's utterance (the first three waveforms are shown in Figure 2S as curves (19a), (19b) and (19c)
), so the output of each monitor gate is a pulse amplitude modulation (hereinafter referred to as PAM) signal obtained by sampling the audio signal of each student, and each monitor gate (3a), (3b ), (3c) connected in parallel to the audio signal bus (4)K, a time-minute side signal 1iPAM signal appears as shown in FIG. 2 DIC.

Next, K, who monitors the speech of a particular student, for example, sb, from such a time division multiplexed PAM signal can open the teacher's communication gate (6t) in accordance with the timing of the PAM signal of the student to be monitored.

Next, referring to FIG. 3, to explain about the RAM (1), the memory section of the RAM (13) has a large number of memory cells arranged in a matrix. , for example, rows 1 to 99 are respectively student Sa,
8b, Sc..., 100 rows are assigned to the teacher's data. Similarly, among the columns of the cell matrix, columns 1 to 99 are assigned to students ga and 8b, respectively.

Assign 100 columns to the teacher's address in the address of Sc.

Then, press the button switch and monitor switch (both not shown) corresponding to the student 8b to be monitored, and
The data is stored in the RAM (2 rows and 100 columns of a cell matrix of 13 cells 120 (see Fig. 3) through the CPU (lη) and both the write address and write data interfaces a9 and αe. Write the call gate timing control signal that matches the PAM timing signal of sb.

In this case, the address of RAM (131) is circular,
The address of KRAM (13) within the cycle matches the contents of the write address interface a9. At this time, the comparator α outputs a matching output, and this output is sent to the RAM (13) via the AND gate a. RAMQ:l is supplied as a write control signal.
Writes the contents of the lc write data interface tte.

The above-mentioned timing control signal is supplied as a demultiplexing signal to the telephone game (6t), and as shown in FIG.
The communication gate (6t) is opened at the same timing as the AM modulation, and the 6PAM signal corresponding to student 5bFc is separated from the time division multiplexed signal and supplied to the low-pass filter (7t). The output of this low-pass filter (7t) is the demodulated PAM signal.
This is an audio signal that approximates the curve (19b) in FIG. 28. Note that a sample and hold circuit that expands the pulse width may be used to improve the signal level after demodulation. In this way, a signal path is formed from the student sb's microphone (1b) to the teacher's headphones (9t), allowing the teacher to monitor the speech of a particular student sb.

In this case, due to element variations and stray capacitance, interference occurs when the tails of adjacent pulses of the time-division multiplexed PAM signal overlap, as shown in the second diagram. Therefore, in order to prevent such interference, PAM as shown in Figure 2F is used.
A pulse train having a polarity opposite to that of the modulation pulse and having a pulse width equal to the predetermined pulse interval of the multi-3iPAM signal is output to the counter at+.
from the audio signal bus (4) to the interference prevention gate (5).
) is intermittently grounded.

Furthermore, in this example, in order to form a signal path between two arbitrary students, for example, student sb and student Sc, K is the telephone game corresponding to student sb, as in the case of the teacher's monitor described above. ) Supplying a demultiplexing pulse with the same timing as the PAM pulse for K student 8c,
Student sb V to the call gate (6C) corresponding to student 8c
It is sufficient to supply a demultiplexing pulse with the same timing as the PAM pulse for C.

That is, as shown in FIG. 3, the cells in the 3rd row corresponding to the data of student 8c and the 2nd column corresponding to the address of student sb in the cell matrix of RAMQ3 (21+ and the 2nd row paired with this cell 1211) Timing control signals as shown in the fourth diagram and E are written to each of the cells Ci!211C in three columns, and these control signals are used as demultiplexing pulses to open both communication gates (6b) and (6C) respectively. , two signal paths are formed from student sb's microphone (1b) to student 8c's headphones (9C) and from student Sc's microphone (IC) to student 8b's headphones (9b), Both students sb and 8c
can communicate freely through these two signal paths.

11! K, when the above-mentioned two students sb and SC and the teacher have a conversation, use the above-mentioned cell ■ in the RAM.

(In addition to 211 and (c), 3 new cell matrix
A timing control signal is written to the cell (to) in row 100 and the cells (25) in row 100 and columns 2 and 3, respectively.

In this way, the communication gates (6b), (6C), and (6t) corresponding to both students sb and 8c and the teacher are opened at predetermined times, respectively, as described above, and three signal paths are established between both students and the teacher. The three parties can freely communicate with each other.

Furthermore, it can be easily understood from the above description that signal paths between a plurality of arbitrary pairs or groups can be easily formed in this example.

A specific example of the collective communication device of the present invention is as follows.

Maximum number of users: ioo people Audio signal frequency band: 5 kHz Pulse frequency of pulse generator a 4MH2PAM pulse width: 250118 Sampling frequency: Approximately 26 kHz Although the present invention is applied to LL, the present invention is not limited to LL. , which can be widely used in mass intercoms, lingering sound systems, etc.

Effects of the Invention As detailed above, according to the collective communication device of the present invention, everyone in a group can form arbitrary bears or groups and communicate freely with each other without using complicated equipment. This is extremely effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the collective communication device of the present invention, and FIGS. 2 and 4 are waveform diagrams illustrating the present invention. FIG. 3 is a conceptual diagram of a RAM used for explaining the present invention. (1a) to (1t) are microphone n phone, (2a) to (2t
) and (8a) to (8t) are amplifiers, (3a) to (3
(t) is the monitor game), (4) is the audio signal bus, (5) is the interference prevention gate, (6a) to (6t) are the communication gates, (
7a) to (7t) are low-pass filters, (9a) to (9t
) is the headphones, (11 is the pulse generator, aQ is the counter, az is the decoder, αJ is RAM, Q41 is the comparator, α9 and aQ are the interfaces, (1?) is the CPU. Figure 2 → 11l-t - Figure 3 Figure 4

Claims (1)

[Claims] A sequential switching transmission means for sequentially switching and transmitting a plurality of audio signals corresponding to a plurality of speakers at predetermined time intervals, and a selection distribution means for selectively distributing the output of the sequential switching transmission means to a plurality of receivers. and the selection distribution means has a receiver designation means for designating a specific speaker, and a timing designation means for designating the transmission timing of the sequential switching transmission means corresponding to the specific speaker. A collective communication device with special features.