JPS6285522A - Packet type voice broadcasting system - Google Patents

Abstract

PURPOSE:To attain the wire voice broadcasting using a packet network without using an exclusive voice broadcasting circuit, by turning the microphone output into a packet. CONSTITUTION:The output of a microphone 1 is converted into the digital signal by an A/D converter 2 and then turned into a packet by a broadcast transmitting device 3. Then thee packets are produced in response to the number of the broadcast receiving devices 5 serving as addresses and sent to a packet network 4. While the device 5 receives the packet from the network 4 to analyze it and delivers the digital signal to a D/A converter 6. The converter 6 converts the digital signal into the analog signal and then delivered in voices through a speaker 7. In such a way, the network 4 is used also for communication of data. This attains the wire voice broadcasting without using any exclusive broadcasting circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packetized audio broadcasting system for performing wired audio broadcasting via a packet network.

[Conventional technology]

In conventional wired audio broadcasting, the output of a microphone is distributed and amplified as an analog signal by a broadcast transmitting device, connected to the destination via a voice-class line, and the analog signal output from the broadcast transmitting device is propagated to a broadcast receiving device via a voice-grade line. The system was to broadcast audio through speakers.

[Problem that the invention seeks to solve]

The above-described conventional wired audio broadcasting system directly connects the broadcast transmitting device and the broadcast receiving device using an audio-class line, and therefore has the drawback of requiring an audio-class line exclusively for audio broadcasting.

[Means for solving the problem] The purpose of the present invention is to provide packetized audio broadcasting that enables wired audio broadcasting using a general pkerat network installed for data communication. The objective is to provide a system that eliminates the need for a dedicated audio broadcast line.

In the present invention, the output of the microphone is digitized by a converter, the broadcast transmitter assembles 7 tickets, generates 2 tickets for the number of destinations, and transmits them to the A' ticket network, and the broadcast receiver converts the tickets to the i4 ticket network. 4' packet audio broadcasting characterized by receiving and disassembling packets from the receiver, sending them to a D/A converter, converting the digital signal to an analog signal with the D/A converter, and outputting audio from a speaker. It is a method.

Further, in one aspect of the present invention, the digital signal from the broadcast transmitting device and the digital signal conversion device is checked, and when there is no sound, the packet is not transmitted to the Nokket network, and the broadcast receiving device: This is a packetized audio broadcasting method in which signals are sent to a D/A converter.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a network configuration diagram showing an embodiment of the packetized audio broadcasting system of the present invention. In the figure, the output of a microphone 1 is converted into a digital signal by a conversion device 2, and the digital signal is converted into a digital signal by a broadcast transmitting device 3, and is converted into a digital signal of 9 digits, which is the number of destination broadcast receiving devices 5. is generated and transmitted to the packet network 4.

The broadcast receiving device 5 receives the Nogukerato from the packet network 4, decomposes the ticket, outputs the digital signal to the D/A converter 6, converts the digital signal to analog, and The speaker 7 outputs audio.

FIG. 2 is a block diagram showing an example of the configuration of the broadcast transmitting device 3 shown in FIG.
is stored in the main storage unit 24 via the .

The CPU 23 assembles the digital signals stored in the main memory 24 into packets, and further creates packets for multiple destinations in the main memory 24. after that.

The CPU 23 transmits the packet stored in the main storage section 24 to the packet network 4 from the communication control section 25.

FIG. 3 is a block diagram showing an embodiment of the configuration of the broadcast receiving apparatus 5 shown in FIG. 1. The communication control unit 32 receives the packet from the 74-ket network 4.

It is stored in the main storage unit 34 via the CPU 33. CPU
33 stores the packets stored in the main memory 34 in the main memory 3.
4, and the first nokket that changes from silent to active is loaded with a queue retrieval wait time equal to the maximum transmission delay time in the nokket network 4. By performing this, the transmission delay difference within the packet network 4 is adjusted.

After that, the packet is taken out from the first-in-first-out queue and the packet is disassembled.

A digital signal is sent to the D/A converter 6 via the communication control section 35.

FIG. 4 is a block diagram showing an example of the program structure of the broadcast transmitting device 3 shown in FIG.
When it receives the number of bits equal to the packet size, it creates a transaction block 43 and delivers it to the broadcast nokkerat expansion unit 44. The bit stream receiving unit 42 continues to receive the dizotal signal from the A/11 converter 2 and repeats the above processing. The broadcast packet expansion unit 44 extracts packets 4 for the number of destinations according to the destination address table stored in the main storage unit 24 shown in FIG.
5 is created and handed over to the socket transmitter 46. The A' ticket transmission 46 follows the interface protocol with the Noyaket network 4 and sends the inherited Nogkerato to NoJ? Send a message to Kerat Network 4.

FIG. 5 shows a flowchart representing the operation of the bit system receiving section 42 of FIG. Operation Stella 7'5
At step 1, one bit is received from the conversion device 2 shown in FIG. 4, and the operation Stella 7'52 checks whether or not the number of bits corresponding to the size of four Kents has been received.

If the number of bits equal to the number of Kent sizes has not been received yet, the process returns to operation Stella 7'51, and operation step 51 and operation Stella f52 are repeated until the number of bits of the Kent size is received. When the number of bits of the packet size is received, the process moves from operation step 52 to operation step 53, where it is checked whether all the received bits are silent, and if they are silent, the process returns to operation Stella 7'51. If there is a bit indicating a sound content among the received bits as determined by the operation Stella 7D53, the process moves to operation step 54. At this time, if all the bits received immediately before were silent, this will be the first bit that changed to sound, so it will be marked, and the transaction block will be sent to the action Stella f54 with the contents of all the received bits. Create 2 from. This transaction block is attached to the broadcast processing unit 44 shown in FIG.
Return to 1.

FIG. 6 shows a flowchart representing the operation of the broadcast packet expanding section 44 of FIG. In operation step 61, a transaction block is received, and in operation Stella f62, variable 1 for counting the required number of destinations is initialized. In operation step 63, variable i is checked with the destination address and transaction prop book # of variable i, and all destinations are checked!
When it is determined that the Kent that surpasses the Kent has finished occurring.

Operation Returns to Stella 7'61 and waits for reception of the secondary transaction block.

FIG. 7 shows a flowchart representing the operation of the packet transmitter 46 of FIG. In an operation block 71, a packet is received from the broadcast/9Kent expansion section 44 in FIG. 4, and in an operation block 72, a packet is transmitted to the network 47 in FIG. 4 according to the interface protocol.

FIG. 8 is a block diagram showing an example of the program structure of the broadcast receiving apparatus 5 of FIG. 3. The packet receiving unit 82 receives the packet from the packet network 4 according to the interface protocol, and transfers the received packet to the packet delay adjustment unit 83. 4. The delay adjusting section 83 adjusts the distortion of the transmission delay that the packet receives in the packet network 4, and outputs a continuous bit stream to the D/A converter 6 from the bit stream transmitting section 84.

FIG. 9 shows a flowchart representing the operation of the receiver section 82 of FIG. Operation Stella 7'91 in Figure 8 /('Interface with Kent Network 4)
According to the protocol, the packet transmitted in operation step 72 of FIG. 7 is received. Operation The packet received by the Stella f92 is transferred to the packet delay adjustment unit 83 in FIG.
The process returns to operation step 91.

FIG. 10 shows a flowchart representing the operation of the packet delay adjustment section 83 of FIG. In operation step 101, the ninth
Inheriting the packet from operation step 92 in the figure, the first input of this program is performed in operation Stella 7'102.
Put it on the first out queue. Operation step 10
In step 3, the packet loaded in the First In-First Out queue is checked for the first time when the packet changed from silent to active, and if it is the first time, the queue is Forcibly in Figure 8 Zekent Network 4
A software wait is applied to hold the signal for a maximum transmission delay time of N seconds. During this dwell time, the order within the queue does not change.

FIG. 11 shows a flowchart representing the operation of the bit stream transmitter 84 of FIG. operation stella f111
Check the status of the packets in the first-in-first-out queue loaded in Figure 10, and
Determine whether there is a packet that can be taken out. If it is removable/? If there is a packet, the process moves to the operation Stella f112, receives the packet, and converts it from the packet format to the bit stream format in the Operation Stella f113.

The bit stream converted in operation step 114 is sent to the D/A converter 6 in FIG. 8, and when all bits have been sent, the operation returns to the operation Stella f111. If there is no retrievable ij ticket from the first-in-first-out contest in operation Stella f111, the process moves to operation step 115, and operation Stella f115 generates a silent bit stream consisting of bits equal to the packet size. is generated and the bit stream is sent out using the operation Stella f114.

〔Effect of the invention〕

As explained above, the present invention allows the output of the microphone to be
'Tickets are not for audio broadcasting,
General /? installed for data communication? By using the Keken network, it is possible to share general data communication and the mother Kent network, and provide a dedicated audio broadcasting line, which has the effect of making wired audio broadcasting possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a broadcast transmitting device, FIG. 3 is a block diagram of a broadcast receiving device, FIG. 4 is a program structure diagram of the broadcast transmitting device, and FIG. FIG. 6 is a flowchart showing the operation of the bit stream receiving section of the broadcast transmitting device, FIG. 6 is a flow chart showing the operation of the broadcast nokkent expansion section of the broadcast transmitting device, and FIG. 7 is a flow chart showing the operation of the packet transmitting section of the broadcast transmitting device. Flowchart, FIG. 8 is a program structure diagram of the broadcast receiving device, FIG. 9 is a 70-chart showing the operation of the Norkent receiving section of the broadcast receiving device, and FIG. 10 is a diagram of the program structure of the broadcast receiving device. Flowchart showing the operation. FIG. 11 is a flowchart showing the operation of the bit stream transmitter of the broadcast receiving apparatus. 1... Microphone, 2... Second conversion device, 3...
Broadcast transmission device, 4...Packet network, 5.
...Broadcast receiving device, 6...D/A converter, 22...
- Communication control unit, 23... CPU, 24... Main storage unit, 25... Communication control unit, 32... Communication control unit, 33
- CPU, 34... Main storage unit, 35... Communication control unit, 42... Bit stream receiving unit, 43...
Transaction block, 44...broadcast packet expansion section, 45...i'? Kekken 46... Rigkerato transmission section, 82... -p# ticket transmission section, 83... Nogukerato delay adjustment section, 84... Bit, Figure 2, Figure 3

Claims (1)

[Scope of Claims] 1. In the wired audio broadcast system, the output of the microphone is digitized by an A/D converter, and the broadcast transmitter assembles packets and generates as many packets as the number of destinations and transmits them to the packet network; A broadcast receiver receives and disassembles packets from a packet network, and
A packetized audio broadcasting system characterized in that the digital signal is sent to an A converter, the digital signal is converted to an analog signal by a D/A converter, and the audio is output from a speaker. 2. In the packetized audio broadcasting system according to claim 1, the broadcasting transmitting device checks the digital signal from the A/D converter and does not transmit the packet to the packet network when there is no sound, and the broadcasting This is a packetized audio broadcasting system in which the receiving device sends a silent digital signal to the D/A converter when not receiving a packet.