JPH0392028A - Pcm carrier - Google Patents

Abstract

PURPOSE:To reduce a processing time by providing a conversion circuit in the order of time slot of time slot replacement (TSA) information. CONSTITUTION:The information representing through which time slot and which channel a data is sent is stored in time slot replacement(TSA) information 1 in the order of channel number, the TSA information 1 is rearranged in the order of time slot by a TSA information conversion circuit 2 to form the converted TSA information 3. The control section 4 reads signaling information 5 based on the converted TSA information 3 rearranged in the order of time slot before the signaling information 5 is sent to a multiplex circuit 6 and latched in the inside of the control section 4. Then a multiplex circuit 6 inserts the converted TSA information 3 and the signaling information stored in the order of channel to a voice stream. Thus, the processing is speeded up and the system is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a PCM transport device, and more particularly to a PCM transport device that inserts side ringing information corresponding to a time slot switching function. [Prior Art] FIG. 5 is a block diagram showing an example of a conventional PCM conveying device. CC ITT, REDBOOKG704 shown in Figure 3
．． The case of a PCM transport device using a frame ellipse of a 2048 Kbit/S PCM signal will be explained as an example. Second
Figure (a) shows time slot switching (hereinafter abbreviated as TSA) information, which is stored in addresses in channel order.
FIG. 4 shows the signaling information, which is stored in the addresses in the order of five channels, but the timing at which the signaling information is sent to the game depends on which time slot the channel corresponding to the signaling information is revealed. In other words, when channel 1 is sent in time slot 3, CHI signaling information is sent in the first 4 bits of time slot 16 of frame 3. As a result, for example, channel 1 has the timing of time slot 3, channel 2 has the timing of time slot ■. T such that channel 3 is sent at the timing of time slot 17
When there is SA information, the control unit 13 scans the TSA information from channel 1 to channel 30 to find out which channel time slot 1 corresponds to, and after determining that time slot 1 is channel 2, it checks the channel 2 signaling. Load information. After that, the TSA information is scanned to determine which channel time slot 17 corresponds to. Similarly, the number of channels in time slot 2 is scanned, and the signaling information is read out in order. As above,
When reading the Siddering information to the transmission application, it is necessary to scan the addresses containing the TSA information for each channel for 30 channels. Thereafter, the signaling information corresponding to each time slot is read out and written into the signaling information memory 14 for 30 channels. From there, signaling information is sent to the multiplexing circuit 15 in accordance with each timing of insertion into the audio stream, and the multiplexing circuit 15 inserts the signaling information into the audio stream. [Problems to be Solved by the Invention] When the above-described conventional PCM transport device reads out signaling information to a transmission application, it is necessary to scan addresses containing TSA information for each channel for 30 channels. Furthermore, the read signaling information was written once into the signaling report memory for 30 channels, and then inserted into the audio stream. Therefore, the processing time from setting the TSA information to inserting the Siddering information into the audio stream becomes long, and the system becomes complicated and large. [Means for Solving the Problems] A PCM transport device of the present invention includes TSA information that stores correspondence information between each channel and time slot in channel order, a conversion circuit that converts this TSA information into time slot order, and this conversion circuit. and a multiplexing circuit that inserts the TSA information from and the signaling information accommodated in channel order into the audio stream.

〔Example〕

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

FIG. 1 is a block diagram of one embodiment of the present invention.

Time slot switching (TSA) information 1 contains information on which channels are to be transmitted in which time slots in order of channel numbers. This TS
The TSA information conversion circuit 2 rearranges the A information 1 (Fig. 2 (a)
Figure 2(b)) is formed. The control unit 4 reads the signaling information 5 based on the converted TSA information 3 rearranged in the order of time slots before sending it to the multiplexing circuit 6.
It is latched inside the control unit 4. Thereafter, it is inserted into the audio channel stream in the multiplexing circuit 6. Next, as shown in Fig. 3, CCITT, RedBook, G
704,2048 kbit/S PCM signal frame structure and Fig. 2(a). TSA information 1, which will be explained using FIG. 2(b), indicates time slots in order of channel numbers as shown in FIG. 2(a). The TSA information conversion circuit 2 rearranges this as shown in FIG. 2(b) and formats the converted TSA information 3. The control unit 4 reads the converted TSA information 3 (from the channel numbers in FIG. The stored sound ringing information 5 is read out in order.Then, the multiplexing circuit 6 inserts it into the audio channel stream at each timing.For example, when transmitting the audio of time slot 1 on channel 2, the control unit 4 The converted TSA signal is transmitted by the timing of transmitting the signaling information, that is, by the first half of time slot 16 of frame 1.
Information 3 judges from Figure 2 (b) that channel 2 corresponds to time slot 1, and latches 4 bits of signaling information 5 of channel 2. Then, similarly inserts into time slot 4bf & half 4 bits of frame 1. The multiplexing circuit 6 reads out the signaling information sent and inserts 8 bits into the time slot 16 of frame 1.The same process is repeated for 30 channels, and the signaling information 5 is sent to the opponent station. [Effects of the Invention] The above explanation As described above, when inserting signaling information using the TSA method, the present invention eliminates the need to operate addresses accommodating 30 channels 30 times and store the read signaling information in memory before inserting it, as in the conventional method. etc,
This is useful for speeding up processing and simplifying the system.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2(a)
, (b) are diagrams showing TSA information and converted TSA information, Figure 3 is a diagram showing the frame structure of a PCM signal, Figure 4 is a diagram showing addresses of signaling information, and Figure 5 is a diagram showing the conventional PCM signal.
FIG. 2 is a block diagram showing an example of a CM conveyance device. 1...Time slot assignment (TSA) information, 2.
... TSA information conversion circuit, 3 ... Conversion TSA information, 4
- Control unit, 5... Signaling information, 6... Multiplexing circuit.

Claims (1)

[Claims] TSA information that stores correspondence information between each channel and time slot in channel order, a conversion circuit that converts this TSA information into time slot order, and T from this conversion circuit.
A PCM transport device comprising: a multiplexing circuit that inserts SA information and signaling information accommodated in channel order into an audio stream.