JP2002176406A - Business broadcast system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital business broadcast system that can coexists with existing contact type systems where connection works of input/output devices are easy. SOLUTION: The business broadcast system is provided with a program timer 5 that provides an output of ON/OFF information of a series of virtual input output contacts as serial data based on the contents of a broadcast program and with a center unit 4 where input devices 1a, 1b,..., 2 are respectively connected to input terminals 21 and output devices 3a, 3b, etc., are respectively connected to output terminals 26 and that receives the serial data at a communication terminal 22b and applies connection control to the input devices and the output devices based on the ON/OFF information of corresponding contacts. The center unit 4 corresponds a virtual contact with respect to the ON/OFF information from the program timer 5 to actual input/output devices to conduct channel connection control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a business broadcasting system for broadcasting on a premises of a department store, a factory, a company, or the like. A possible business broadcast system.

[0002]

2. Description of the Related Art To explain an example of a business broadcasting system installed in a department store, a broadcasting speaker is installed on each floor,
A broadcasting microphone is installed in each broadcasting room and each floor, and a recording device for recording predetermined announcement contents, a CD player for background music (hereinafter, BGM), and the like are installed in the broadcasting room. A program timer installed in the room selects one of input devices (microphone, recorder, CD player, radio, etc.) and one of output devices (speaker for each floor) according to a preset broadcast program It is supposed to. Then, the selected input device and output device are connected within the broadcast line control device, and a regular guide broadcast is sent to the whole building, a temporary announcement of lost children is broadcast, and the attraction broadcast only to the rooftop speaker. Or shed.

A conventional business broadcast system is a contact type system, and its broadcast line control device is provided with a group of terminals for connecting input devices and a group of terminals for connecting output devices on the back. For example, the broadcast speaker on the first floor of the main building
Connect to the 1 output terminal, connect the broadcast speaker on the first floor of the annex to the # 2 output terminal, connect the broadcast speaker on the main building roof to the # 8 output terminal, and connect the microphone in the broadcast room to the # 1 input terminal. ,..., The CD player is connected to the # 8 input terminal, and so on.

[0004]

SUMMARY OF THE INVENTION A business broadcast system comprises:
As the broadcast scale becomes larger, it is necessary to prepare a broadcast line controller having a larger number of input terminals and output terminals, and to connect input devices and output devices to the broadcast line controller. Moreover, if it is not clear which input device is connected to which input device and which output device is connected to which output device, a broadcast program cannot be created. In doing so, for example, it is determined that the microphone in the broadcast room must be connected to the $ 5 input terminal. For this reason, there is a problem that the wiring connection work of the input device and the output device is difficult, and when there is an entertainment, etc., and the input / output needs to be changed, the connection work is required each time, and it cannot be flexibly handled. Problems arise.

The commercial broadcasting system has conventionally been a contact system, but various advantages can be obtained by making it a digital control system using recent digital technology. However, since the existing broadcasting system uses a contact type system, it is not easy to replace all existing equipment in terms of equipment cost, and it is difficult to spread even if there is a demand for digital broadcasting system It is. Also, it takes time for a person who has been involved in the operation of the conventional business broadcasting system to be able to shift to the operation of a completely new system, which is also a factor preventing the spread of the digital business broadcasting system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and allows for easy connection work of input / output devices and can coexist with an existing contact type system and can be operated in the same manner as an existing contact type system. An object is to provide a possible business broadcasting system.

[0007]

An object of the present invention is to provide a program timer for outputting a series of input / output contact on / off information as serial data based on the contents of a broadcast program, and a plurality of input devices connected to a plurality of input terminals, respectively. A plurality of output devices are connected to each of a plurality of output terminals, the serial data is received, and a center unit that controls connection between the input device and the output device based on ON / OFF information of a corresponding contact is provided. You.

Preferably, in the above, a remote control microphone device is provided as the input device at a location remote from the installation location of the center unit, and the center unit converts a voice signal taken from the input device into a digital signal. And digital-to-analog conversion means for converting the converted digital signal into digital data, and converting the digitally processed signal back to an analog signal and outputting from the output device.

Further, in the above, the center unit includes means for internally recording the input audio signal,
The recording means records the audio signal as a digital signal. Further, the center unit includes a memory device for recording the digital signal. Further, in the above, the center unit treats a contact corresponding to the on / off information sent from the program timer as a virtual contact, and performs connection control of the input terminal and the output terminal corresponding to each virtual contact by digital processing. It includes a CPU and a line control unit.

More preferably, in the above, the program timer includes an external contact terminal for controlling an external device, in addition to a communication terminal connected to the center unit by the serial data, and the center unit includes: In addition to an input terminal to which an input device is connected and an output terminal to which the output device is connected, an external contact input terminal for receiving a contact input and an external contact output terminal for outputting a contact signal are provided. Also,
The center unit includes a connection terminal connected to a personal computer.

More preferably, the center unit has a path for returning an audio signal output from any of the output terminals to the input terminal, and returns the content recorded by the recording means to the input terminal. Have a route,
The input device has a path for simultaneously returning the content recorded by the recording means to the input terminal, and the input device has a monitor function of outputting an audio signal taken in from the returned path. The program timer has a card slot for mounting an external storage medium storing a broadcast program.

According to the present invention, a center unit is newly provided, an input device and an output device are connected to the center unit, and line connection control between the two is performed by digital processing. By performing such digital processing,
The control can be performed by the CPU, so that the size of the apparatus can be reduced, and crosstalk between lines can be eliminated. Further, it becomes easy to mix a plurality of audio signals.

Further, in the present invention, a contact on / off signal is inputted from the same program timer to the center unit in accordance with a broadcast program as in the prior art. However, the center unit handles this contact information not as real contacts but as virtual contacts. The center unit associates virtual contacts with actual input devices and output devices. For this reason, the system operator can handle the existing contact type system and the business broadcasting system of the present invention in the same manner, and the connection between the input / output device and the center unit needs to be connected to a predetermined input / output terminal. And wiring connection work becomes easier.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a business broadcast system according to an embodiment of the present invention. Although this business broadcasting system is a new system that has been digitized, it can be mixed with a conventional contact system, can be used in the same way as a conventional contact system, and can create a broadcast program.

The business broadcast system according to this embodiment includes a plurality of remote control microphones 1a, 1b,.
, An external sound source (for example, a CD player, a recording tape, an IC recorder, a radio, etc.) 2 as an input device, and a plurality of speakers 3a, 3b,... As output devices (each speaker is connected via an amplifier 19, respectively). And a center unit 4 provided between the input device and the output device.
The business broadcasting system further includes a program timer 5, and a personal computer (PC) 6 that is generally used can be connected to the center unit 4 so that the personal computer 6 can be used.

The audio output of each remote control microphone 1a, 1b,... Installed at a remote place remote from the center unit 4 is connected to the audio input terminal 21 of the center unit 4, and the communication terminal of each remote control microphone 1a, 1b,. 10 (see FIG. 2)
Is connected to the communication terminal 22a of the center unit 4.

The program timer 5 is, for example, RS232
A serial communication terminal 51 (see FIG. 3) such as C and a plurality of external contact terminals 52 are provided. The communication terminal 51 is connected to the serial communication terminal 22b of the center unit 4 by a cable, and the external contact terminal 52 is connected to an external terminal. Connected to control input terminal of sound source 2.

The sound output from the external sound source 2 is output from the center unit 4.
And a control output (for example, a busy signal) is connected to the control input terminal 23a of the center unit 4.

Each analog audio output of the input device (microphones 1a, 1b,..., External sound source 2) is connected to each audio input terminal 21 of the center unit 40, and the amplifier 19 is connected to each audio output terminal 26 of the center unit 4. Are connected to each other via the audio input terminal 21. In the present embodiment, there is no restriction that which input device must be connected to which input terminal of the audio input terminal 21 and which audio input terminal. It is configured to be connected to. The same applies to the output terminal.

After each of the input devices is connected to an arbitrary audio input terminal, the CPU 24 of the center unit 4 controls the remote control microphones 1a, 1b,... And the external sound source 2 (via the program timer 5) via a communication cable. By issuing a detection signal output command to the device and identifying from which audio input terminal the detection audio signal has been taken, it is possible to automatically know which input device is connected to which audio input terminal.
With respect to the output terminal, the detection signal is output from each audio output terminal in order, and the user is made to set and input which output device is output from the center unit 4 to identify the output terminal, or set and input at the time of wiring connection. The “terminal number” of the input terminal or the output terminal can be arbitrarily changed later.

As described above, after identifying which input terminal each input device is connected to and which output terminal each output device is connected to, a correspondence table (not shown) (not shown) The input / output terminal number correspondence table) is stored in the memory in the center unit 4.

FIG. 2 is a detailed configuration diagram of the remote control microphone 1a (the other remote control microphones 1b,... Have the same configuration). The remote control microphone 1a includes a control system and an audio system. The control system includes a control unit 11a that controls the entire remote control microphone 1a, a display unit 11b such as a liquid crystal panel, and an operation unit 11c such as operation buttons. , Communication means 11d, and a bus 11e interconnecting them.
The external connection terminal 1d is connected to the center unit 4.

The sound system includes a microphone 12a for taking in a sound spoken by an announcer, an external sound input terminal 12b for taking in a BGM signal such as a recording tape, a sound source 12c such as a ring tone (call sign) emitted at the time of broadcasting, and an input sound signal. Signal control unit 12d for selecting and adjusting the volume
And an adder 12 for adding the output of the input signal controller 12d
e, an audio input / output switching unit 12f provided between the output of the adding unit 12e and the audio input / output terminal 13 for switching the input / output of the audio signal, and a monitor audio output control for switching the monitor audio signal and adjusting the volume. 12g. A monitor audio output terminal 14 serving as a monitor output unit and a built-in monitor speaker 15 are connected to the output of the monitor audio output control unit 12g, and a speaker or an earphone installed near the remote control microphone 1 is connected to the monitor audio output terminal 14. Are connected. The audio input / output terminal 13 is connected to the audio input terminal 21 of the center unit 4 as described above.

The control section 11a includes an input signal control section 12d,
The addition unit 12e, the audio input / output switching unit 12f, the monitor audio output control unit 12g, and the communication unit 11d are controlled as follows. For example, when it is desired to announce the input voice from the microphone 12a via the center unit 4 from the speaker on the first floor of the main building, the remote control microphone operator inputs an operation command to that effect from the operation unit 11c.

Thus, the control unit 11a communicates with the communication unit 1
1d informs the CPU 24 of the center unit 4 that there is a connection request from the remote control microphone 1a.
4 causes the connection of the matrix line 25 in the center unit 4 to be changed, and the audio input / output terminal 13 of the remote control microphone 1a.
And the speaker on the first floor of the main building. Then, the control unit 11a outputs a selection command to the input signal control unit 12d, the addition unit 12e, the audio input / output switching unit 12f, and the monitor audio output control unit 12g, and the input audio signal from the microphone 12a is input to the input signal control unit. 12d → addition unit 12e → sound input / output switching unit 12f → terminal 13 and a route to be formed, and monitor speaker 15 and microphone 12a
Then, the monitor sound volume is controlled by the monitor audio output control unit 12g so that the howling does not occur.

The user does not send the input voice from the microphone 12a or the input voice from the voice input unit 12b to the center unit 4 but the monitor speaker 15
When the user wants to confirm, a command to that effect is input from the operation unit 11c. Thereby, the control unit 11a includes the input signal control unit 12d, the addition unit 12e, and the audio input / output switching unit 12f.
Then, a selection command is output to the monitor audio output control unit 12g, so that the audio to be monitored is output from the monitor speaker 15, and this audio is not sent to the center unit 4.

When the operator of the remote control microphone 1a wants to check the monitor sound recorded in the semiconductor memory in the center unit 4 with the speaker 15, as will be described later in detail, an operation command to that effect is sent to the operation unit 11c. Enter from. Thus, when the control unit 11a sends a command to that effect to the center unit 4 via the communication unit 11d, the center unit 4 transmits the monitor sound output from the semiconductor memory to the sound input terminal 21 (this terminal). Is also used as a monitor audio output terminal, as will be described later.)
Wrap back to The returned monitor sound is transmitted to the control unit 1
In response to a command from the remote control microphone 1a, the sound is input to the audio input / output switching unit 12f from the audio input / output terminal 13 of the remote control microphone 1a, sent from the audio input / output switching unit 12f to the monitor audio output control unit 12g, and output from the speaker 15.

FIG. 3 is a detailed configuration diagram of the program timer 5. The program timer 5 includes a control unit 53a that controls the entire program timer 5, an external storage medium control unit 53b that is connected to the card slot 54 and controls an external storage medium mounted in the card slot 54, and a time signal input terminal 55 A time correction input unit 53c for capturing time signal information of a television broadcast or an FM broadcast, a display unit 53d such as a liquid crystal panel, an operation unit 53e such as an operation button, and an external contact control unit 53f for controlling contact of the external contact 52. A communication means 53g connected to the communication terminal 51 for outputting serial data to the center unit 4, a bus 53h for interconnecting them, and a time management unit (clock) 53i connected to the control unit 53a. Consisting of

The program timer 5 controls the contact of an external contact terminal 52 provided therein based on a broadcast program written in an external storage medium inserted in a card slot 54 and the time of a clock 53i. Alternatively, a control command is output to the CPU 24 of the center unit 4 to switch the line connection of the line controller (matrix) 25 of the center unit 4, and the corresponding input device connected to the audio input terminal 21 and the audio output terminal 26 Connect the connected output device.

The program timer 5 is configured to be able to perform control using a virtual communication contact function, while being able to follow a mixture of existing contact control devices and a program design technique. I have. That is, in the broadcast program according to the present embodiment, for example, the chime is activated by turning on the contact number # 1 at am 8:00, and the broadcast line is opened by turning on the contact # 2 and the contact # 3. In accordance with this program, the control unit 53b turns on the contact output number # 1 at am8: 00 and simultaneously turns on the communication contacts 102 and 103 at am8: 00 according to the program. And the center unit 4 via the communication means 53g.
Can be output as serial data to the same communication terminal.

The C of the center unit 4 receiving this signal
The PU 24 refers to, for example, a correspondence table between the communication contact terminals and the actual contact terminals of the center unit, and switches the connection of the line control unit (matrix) 25 and the like so as to correspond to the turned on communication contacts. In the example of the above program, at the same time when the sound source of the broadcasting room corresponding to the physical contact output # 1 is activated, the input line corresponding to the communication contact 102 is opened to define a matrix pattern,
The real contact terminal of the center unit 4 connected to the line switching device is turned on so as to open the speaker line on the third floor.

The program timer 5 includes a real contact (external contact terminal) 52 in addition to the virtual communication contact as described above. In this example, the control terminal of the external sound source 2 is connected to one of the actual contacts, and the program timer 5
Is turned on, the power of the external sound source 2 is turned on and the BGM
Starts. The BGM is input to one of the audio input terminals 21 of the center unit 4 and, based on a signal sent from the program timer 5 to the center unit 4 via a communication cable, the BGM is output by the output device designated by the program timer 5. Output from

Since the CPU 24 of the center unit 4 needs to know whether the audio output from the external sound source 2 is actually input to the center unit 4, if the audio output is output from the external sound source 2, A busy signal indicating this is input from the external sound source 2 to the control input terminal 23a of the center unit 4, and the CPU 24 detects this. When the external contact terminal 5 of the program timer 5 is added, a dedicated expansion unit is connected to cope with it.

FIG. 4 is a detailed configuration diagram of the center unit. The center unit 4 includes a control system, a line selection system, an internal sound source system, and an external contact system. The control system includes a CPU 24 that controls the whole of the center unit 4 and a table that is accessed from the CPU 24 and that is described above (correspondence table between device numbers and input / output terminal numbers, communication contact terminals and actual contact terminals of the center unit). 27a, a display unit 27b such as a liquid crystal panel, an operation unit 27c such as an operation button, and communication units 27d and 27e connected to the communication terminals 22a and 22b.
And a communication means 27f connected to the communication terminal 22c to which the PC 6 is connected, and a bus 28 for connecting these to each other.

The line selection system includes an analog / digital (A / D) converter 30 provided corresponding to each of the plurality of analog audio input terminals 21, an audio input terminal 21 and each of the A / D converters.
A / A corresponding to each input terminal provided between the converter 30
A line selection switch group 31 for switching connection / disconnection with the D converter 30 according to an instruction from the CPU 24, a digital / analog (D / A) converter 32 provided for each output terminal 26, and a D / A converter A line control unit (matrix) 25 provided between the A / D converter 30 and each A / D converter 30 for performing line control according to an instruction from the CPU 24;
One of the inputs (actually, a plurality of signals after A / D conversion of the audio input, a plurality of signals after line control (25), and a monitor reproduction (43) signal) C
A monitor system selection unit 33 selected by an instruction of the PU 24;
D / A of an output terminal (referred to as 26a) which is an audio output and monitor output terminal at one of the audio output terminals 26.
Either the output of the monitor system selection unit 33 or the output of the line control unit 25 provided before the converter 32
And one of the inputs of the monitor system selector 33 is a line controller 25.
Output.

The internal sound source system includes a recording / reproducing device 35, an external storage device 36 connected to the recording / reproducing device 35, a card slot 37 for mounting an external storage medium, and a built-in semiconductor memory device 37a; It comprises a memory 38 storing a control program 35 and a recording system selection switch 39 which operates as described later.

The recording / reproducing device 35 includes a recording / reproducing control unit 40 for performing recording / reproducing control on a semiconductor memory device mounted on the external storage device 36 or the card slot 37 in accordance with a command from the CPU 24, and one system in this embodiment. Recording buffer 41, a four-system reproduction buffer 42, and a monitor reproduction buffer 43.
Switch 39 (actually, any one of A / D-converted voice inputs)
Of the A / D converter 30 through the selection of one (that is, the selection of the input voice to be recorded), and the output of the A / D converter 30 is
3 is one input. 4 playback buffers 4
Each output of 3 is connected to an input section of the line control unit 25, and the output of the reproduction buffer 42 is output from the speaker 3. The output of the monitor reproduction buffer 43 is the remaining one input of the monitor system selector 33.

The external contact system has a contact control input section 45 connected to the control input terminal 23a and a contact control output section 46 connected to the control output terminal 23b.
24, the contact control input unit 45 transfers the signal received from the control input terminal 23a to the CPU 24,
The contact control output unit 46 that has received the command from the PU 24 controls the corresponding control output terminal 23b to turn on and off. The center unit 4 operates based on the concept of a virtual contact as described above, but also has an external contact system for coexistence with existing contact control devices.

In the center unit 4, the number of audio input terminals 21 functioning as virtual contacts, the number of control input terminals 22a and the number of control output terminals 23b, which are real contacts, are
By installing dedicated terminal boards, they can be expanded.

The CPU of the center unit 4 having the above configuration
24 receives a communication signal (broadcast program signal) from the program timer 5 captured from the communication terminal 22b, and refers to the above-described correspondence table in the memory 27a based on the ON / OFF signal of the virtual contact in the communication signal. The line selection switch group 31 (the function of this switch is to select the audio input side as a normal operation and send it to the A / D converter. If you want to monitor the broadcast destination on the input device side (remote control microphone), A signal selected as an output (a signal to the terminal 26a) is selected and returned to the corresponding audio input side.
The line of the line controller 25 is switched. Thus, the output audio signal of the corresponding input device (remote control microphone or external sound source) is converted into a digital signal by the corresponding A / D converter 30 through the line selection switch group 31, and the line control unit 25 outputs the digital signal. Is selected, converted into an analog signal by the D / A converter 32 on the selected output path, and output from the corresponding speaker 3.

Here, for example, when the content broadcast from the remote control microphone installed in the broadcast room is recorded and the broadcast is repeated after a predetermined time, a predetermined operation button of the remote control microphone is pressed. Thereby, the CPU of the center unit 4
24 receives a request signal fetched from the terminal 22a via the communication cable, closes the recording system selection switch 39, outputs a control command to the recording / reproduction control unit 40, and transmits an output signal of a remote control microphone installed in the broadcasting room to the line. A control signal is output to the line selection switch group 31 so as to be taken in from the selection switch group 31, and the line control unit 25 is controlled so as to select a speaker for outputting the sound.

The output signal of the remote control microphone installed in the broadcasting room is converted into a digital signal by the corresponding A / D converter 30, passes through the line control unit 25, and is converted to a digital signal by the corresponding D / A converter 3.
2 is output to the corresponding speaker in the same manner as described above, but the digital signal output from the A / D converter 30 is also input to the recording buffer 41 through the recording system selection switch 39. The recording / reproduction control unit 40 records the audio signal captured from the recording buffer 41 in the external storage device 36 or a memory device mounted in the card slot 37. A hard disk or the like is used as the external storage device 36. As the memory device, a PC memory card, a Compact Flash (registered trademark), or the like is used.

By recording in this way, the recorded content is:
It can be used for broadcasting as an internal sound source. Here, if the input of the remote control microphone in the broadcasting room or a person near another remote control microphone wants to listen to the recorded content, the user presses a predetermined operation button of the remote control microphone installation and transmits a request signal to the communication cable. The data is transmitted to the CPU 24 via

Upon receiving this request signal, the CPU 24 sends a control signal to the recording / reproducing control unit 40, and the monitor reproduction buffer 43
The recording signal is output through the
3 is input. The CPU 24 controls the monitor system selecting unit 33
The CPU 24 also outputs a selection command to the selection switch 34 to select the output of the monitor system selection unit 33. As a result, the recorded audio signal is input to the selection switch 32.
Is converted into an analog signal by the D / A converter 32, and then returned to the line selection switch group 31 to be sent to the remote control microphone requesting the recorded content.

The signal of the recorded content is supplied from terminal 21 to FIG.
Flows through a monitor audio selection unit 12c, a selection addition unit 12e, and a monitor audio output control unit 12d, and is output from a speaker 15 installed in a remote control microphone.

When the remote control microphone confirms the recorded content while recording the output sound of the remote control microphone as the built-in sound source in the center unit 4, the request signal is output to the CPU 24 via a communication cable. Upon receiving the request signal, the CPU 24 closes the recording system selection switch 39 to perform recording, and at the same time, outputs a selection command to the monitor system selection unit 33 and the selection switch 34 to cause the monitor system selection unit 33 to select a recording signal. . Thus, the recording can be monitored simultaneously with the recording.

When it is desired to confirm the sound actually output from any of the speakers 3 on a speaker provided with a remote control microphone such as a broadcasting room, a request signal to that effect is output to the CPU 24 via a communication cable. Upon receiving the request signal, the CPU 24 sets the monitor system selection unit 33 and the selection switch 3
4 and outputs a selection command to the monitor system selection unit 33 to select a signal returned as an input to the monitor system selection unit 33 from among the signals output from the line control unit 25. Return to switch group 31. This allows the remote control microphone to check the content actually being broadcast in the building in the broadcast room or the like.

It is also possible to automatically broadcast the sound digitally recorded on a PC card or the like by a virtual communication contact of a program timer or an external contact input to a center unit.

[0050]

According to the present invention, it is possible to provide a digitally controlled business broadcasting system which can be mixed with a conventional contact type system, can be used in the same way as the conventional contact type system, and can create a broadcast program. Becomes possible.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a business broadcast system according to an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of a remote control microphone shown in FIG.

FIG. 3 is a detailed configuration diagram of a program timer shown in FIG. 1;

FIG. 4 is a detailed configuration diagram of a center unit shown in FIG. 1;

[Explanation of symbols]

 1a, 1b, ... Remote control microphone (input device) 2 External sound source (input device) 3a, 3b, ... Speaker (output device) 4 Center unit 5 Program timer 6 Personal computer 10 Communication terminal 12a Microphone 21 Audio input / output terminal 22a, 22b , 22c Communication terminal 24 CPU 25 Line control unit 26 Output terminal 31 Line selection switch group 35 Recording / reproducing device 36 External storage device 37 Card slot 51 Serial communication terminal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsushi Sugawara 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. Matsushita Communication Industrial Co., Ltd.

Claims (19)

[Claims] 1. A program timer for outputting on / off information of a series of output contacts as serial data based on the contents of a broadcast program, a plurality of input devices connected to a plurality of input terminals, respectively, and a plurality of output devices including a plurality of output terminals. And a center unit that is connected to each of the above and receives the serial data and controls connection between the input device and the output device based on ON / OFF information of a corresponding contact. 2. The business broadcasting system according to claim 1, further comprising a remote control microphone device installed at a location remote from a location where the center unit is installed, as the input device. 3. The analog-to-digital converter according to claim 1, wherein the center unit converts an audio signal taken from the input device into a digital signal, an analog-to-digital converter, and a digital processor that processes the converted digital signal. A business broadcast system comprising: a digital-to-analog conversion unit that converts a digitally processed signal into an analog signal and outputs the signal to the output device. 4. The business broadcasting system according to claim 1, wherein said center unit includes means for internally recording an input audio signal. 5. The business broadcasting system according to claim 4, wherein said recording means records the audio signal as a digital signal. 6. The business broadcasting system according to claim 5, wherein the center unit includes a memory device for recording the digital signal. 7. The input terminal according to claim 1, wherein the center unit treats a corresponding contact of on / off information sent from the program timer as a virtual contact, and the input terminal corresponding to each virtual contact. A business broadcasting system comprising a CPU and a line control unit for controlling connection of the output terminals by digital processing. 8. The program timer according to claim 1, wherein the program timer includes an external contact terminal for controlling an external device in addition to a communication terminal connected to the center unit by the serial data. Business broadcasting system characterized by the following. 9. The external device according to claim 1, wherein the center unit is configured to receive a contact input in addition to an input terminal to which the input device is connected and an output terminal to which the output device is connected. A business broadcast system comprising a contact input terminal and an external contact output terminal for outputting a contact signal. 10. The business broadcasting system according to claim 1, wherein the center unit includes a connection terminal connected to a personal computer. 11. The business broadcast according to claim 1, wherein the center unit includes a path for returning an audio signal output from one of the output terminals to the input terminal. system. 12. The business broadcasting system according to claim 4, wherein the center unit has a path for returning the content recorded by the recording means to the input terminal. 13. The business broadcasting system according to claim 4, wherein the center unit has a path for simultaneously returning the contents recorded by the recording means to the input terminal. . 14. The business broadcast system according to claim 11, wherein the input device has a monitor function of outputting an audio signal taken from the folded path. 15. The business broadcast system according to claim 1, wherein the program timer includes a card slot for mounting an external storage medium storing a broadcast program. 16. A virtual communication contact of the program timer according to claim 1, wherein the contents of digital recording of a voice signal input to the center unit from any of the input devices in a memory device are provided. Alternatively, a business broadcasting system having a function of automatically broadcasting by an external contact input input to the center unit. 17. A program timer comprising the business broadcast system according to claim 1. Description: 18. A center unit comprising the business broadcasting system according to claim 1. Description: 19. An input device constituting the business broadcast system according to claim 1. Description: