JPH0691533B2 - Voice / Data Comprehensive Local Area Network - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an access control type voice / data integrated local area network in which voice and data are packetized and communicated, and voice packets have priority over data packets.

[Prior Art] Conventionally, in an integrated voice / data local area network, an access control method has been used in which a voice packet is controlled prior to a data packet in order to satisfy the requirement of real-time voice performance.

[Problems to be solved by the invention]

The above-described conventional access control method has a drawback in that when the load on the network increases, only voice packets are transmitted and data packets are hardly transmitted, and the quality of service is very poor for users of data communication.

An object of the present invention is to provide a voice / data integrated local area network in which the voice service quality is improved to a minimum while ensuring the voice communication quality at the time of high traffic.

[Means for solving problems]

The present invention relates to an access control type integrated voice / data local area network in which voice and data are packetized and communicated, and voice packets have priority over data packets. Sampling data of a plurality of sampling points in one voice packetization section Of the first sampling data and the first packet including the sampling data having a displacement with respect to the previous sampling point equal to or more than a predetermined value and the position information thereof, and the displacement with the previous sampling point having a predetermined value Means for packetizing into two with a second packet containing less than the sampled data, prioritizing said first packet and transmitting said second packet with the same non-prioritized treatment as said data packet; In reproducing the original audio signal by the audio packet, the first audio packetization section
When both the second packet and the second packet are received, the packet is decomposed so as to be reproduced according to the information of these two packets, and when the second packet is not reached, the packet is dropped in the first packet. The sampled data being processed is considered to be the same as the value of the sampled data at the previous sampling point, and packet disassembling means for disassembling the packet is provided.

That is, according to the present invention, of the information in the voice packet, only the data that is at least necessary for maintaining the intelligibility is given priority, and the other data is treated in the same manner as the data packet.

In the present invention, since only the minimum required data is preferentially transmitted from the data in one packetized section of the encoded voice signal, the receiving side restores the voice signal with only the data in one priority packet during high traffic. However, in the case of a voice signal, even if data with a small weight in one packetized section is lost, the speech quality is somewhat deteriorated, but the intelligibility is obtained.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a voice / data integrated local area network of the present invention, and FIG. 2 is a view showing packet contents for explaining the operation of the present embodiment.

Here, it is assumed that the encoded voice is coded by the 8-bit PCM system, has a word of 8 bits, and is sampled at 8 MHz (cycle of 125 μs). Therefore, the encoded data is +
It will take a value from 127 to -127. Furthermore, the packetization period is set to (125 × 10) μs. Therefore, one packetized section includes coded speech of 10 words.

In addition, in the present embodiment, it is assumed that the data whose displacement from the previous sampling point is less than 5 is included in the second packet.

It is assumed that 10 data are input from the encoded voice input / output line 1 in one packetized section shown in FIG. The voice packet assembling / disassembling circuit 2 uses the first data # 1 and
First data # 2,3,7,8,10 with displacement of 5 or more from the previous sample point
It is determined that the data is included in the first packet and is included in the first packet. In the first packet, the data included in this packet is displayed on the display section (the part marked with * in FIG. 2B), the data included is set to "1" and the data not included is set to "0" from the data of # 1. The 10 bits are shown in order. As a result, the first packet is created as shown in FIG. At the same time, the data # 4, # 5, # 6, and # 9 whose displacement from the previous sampling point is 5 or less is used as the second packet, and the second packet is created as shown in FIG. 2 (C). Here, the first packet is a priority packet and the second packet is a non-priority packet.

The priority packets thus assembled by the voice packet assembling / disassembling circuit 2 are sent to the priority buffer 5 and the non-priority packets are sent to the non-priority buffer 6, respectively, which are read out by the access control circuit 7 when necessary and are transmitted to the transmission line. 8 is sent. Further, the input from the data input line 3 is sent to the non-priority buffer 6 after being subjected to necessary conversion in the data interface circuit 4, and is sent to the transmission unit 8 in the same manner as the voice non-priority packet. The access control circuit 7 performs the above control according to a known control procedure of the prioritized local area network.

At the time of reception, as in the normal case, the input packet from the transmission line 8 is received by the access control circuit 7, and the access control circuit 7 determines voice / data, and accordingly, the voice packet assembling / disassembling circuit 2 or It is sent to the data interface circuit 4. The respective circuits 2 and 4 perform processing and then output the encoded voice input / output line 1 or the data input / output line 3, respectively. When the voice packet assembling / disassembling circuit 2 receives both the first packet and the second packet by the time of packet disassembling, it uses the 10 pieces of data included in both of them to make the second packet.
Encoded voice input / output line 1 by reproducing the original signal shown in FIG.
Output to. During high traffic, when the second packet cannot be received by the time of packet decomposition, the voice packet assembling / disassembling circuit 2 determines the data included in the second packet according to the content of the first packet. In the position of
The most previous sample point (# 4-6 included in the first packet)
, The contents of # 3 contained in the first packet,
At the position of # 9, the data shown in FIG. 2D is reproduced using the same data as the contents of # 8) and is output to the encoded voice input / output line 1.

〔The invention's effect〕

As described above, the present invention can eliminate the disadvantage that only voice is transmitted during high traffic and almost no data is transmitted by transmitting the data having a low weight of the encoded voice signal as a non-priority packet. There is an effect that the traffic balance of the whole can be maintained by slightly degrading the call quality, and the serviceability of the data communication can be improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a voice / data integrated local area network of the present invention, and FIG.
(D) is a frame format for explaining packetization of voice in the embodiment of FIG. 1 ... Encoded voice input / output line, 2 ... Voice packet assembling / disassembling circuit, 3 ... Data input / output line, 4 ... Data interface circuit, 5 ... Priority buffer, 6 ... Non-priority buffer, 7 ... ... access control circuit, 8 ... transmission path.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location H04L 12/56 H04Q 11/04 9076-5K H04Q 11/04 R

Claims (1)

[Claims] 1. A voice / data integrated local area network of an access control system in which voice and data are packetized for communication, and voice packets have priority over data packets. Sampling of a plurality of sampling points in one voice packetized section. Among the data, the displacement between the first sampling data and the previous sampling point and the first packet including the sampling data having the displacement equal to or greater than the predetermined value and the position information thereof is determined in advance. Means for packetizing into two, a second packet containing sampled data less than a value, prioritizing the first packet and transmitting the second packet as the same non-priority treatment as the data packet; When the original voice signal is reproduced by the received voice packet, the first voice packetization section is used for the first voice packetization section.
When both the second packet and the second packet are received, the packet is decomposed so as to be reproduced by the information of these two packets, and when the second packet is not reached, the packet is dropped in the first packet. A voice / data integrated local area network characterized by comprising: packet disassembling means for disassembling the packet assuming that the sampled data is the same as the value of the sampled data at the previous sampling point.