JPH07101862B2 - Transcoder equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transcoder device for converting PCM data into ADPCM data, and more particularly to format conversion of signaling information.

(Prior Art) Conventionally, as a transcoder device of this type, for example,
There is one that converts 2.048 Mbit / s, 30-channel PCM data transmitted from each of two transmission lines into 2.048 Mbit, 60-channel ADPCM data. Each channel of PCM data includes audio information and 4-bit signal information indicating a destination and the like. In the transcoder device, voice information is compressed to half by PCM / ADPCM code conversion for normal channels, and 2 bits of 4 bits (a, b, c, d) of signaling information are compressed.
Select (a, b) (that is, 2bit (c, d) is deleted). On the other hand, 4 bits for a specified channel (direct channel) that does not perform PCM / ADPCM code conversion of audio information
The signaling information of is output as it is, while the signaling information of other specific channels is deleted. At the same time, the signaling information is rearranged in a predetermined channel order.

In this way, in the transcoder device, for signaling information, in the case of a direct channel, 4 bits are left as they are, and the corresponding specific channel is deleted, and in the case of a channel other than the direct channel, it is changed to 2 bits and then rearranged in frame units. Format conversion processing is performed.

FIG. 3 is a block diagram showing a configuration example of a format conversion portion of signaling information in the transcoder device. In the figure, 1a is PCM data (2.
Signal extraction unit for extracting signal information from 048 Mbit / s, 30 channels, 1b is a signal extraction unit for extracting signaling information from PCM data (2.048 Mbit, 30 bits) from PCM transmission line B, and 2a is a control signal (channel selection) Selection unit for selecting the output destination of the signaling information from the signaling extraction unit 1a for each channel based on the signal), 2b similarly selecting unit for selecting the output destination of the signaling information from the signaling extraction unit 1b, and 3a for controlling Format conversion unit for direct channel that performs format conversion of signal information of the direct channel from the selection unit 2a based on the signal, 3b performs format conversion of signaling information of channels other than the direct channel from the selection unit 2a based on the control signal. The format converter, 3b, performs the direct channel sigma from the selector 2b in the same way. Format conversion unit for direct channel that performs format conversion of nulling information, 3b similarly a format conversion unit that performs format conversion of signaling information excluding direct channels from the selection unit 2b, 5 selection units 2a, 2b and format conversion unit Control unit for controlling 3a, 3b, 4a, 4b, 6 is a combining unit for combining output information of format converting units 3a, 3b, 4a, 4b, 7 is a signaling inserting unit for inserting combined signaling information into ADPCM data Is.

FIG. 4 is a time chart showing the operation of the conventional device.
The figure shows one frame (30 channels on the input side and 60 on the output side).
Channel), the signaling information channel from the PCM transmission line A (A side channel) is indicated by A1 to A30, and the signaling information channel from the PCM transmission line B (B side channel) is indicated by B1 to B30. Show. In this example, the channels that can be used as direct channels (hereinafter referred to as direct channels) are A4, A6, A8, A1.
0, A12, A14, A16, A17, A19, A21, A23, A25, A27, A29,
The B-side channel is also the same.

Next, the operation of the conventional device will be described.

2 Mibt / s, 30-channel PCM data from the PCM transmission line A is input to the signaling extraction unit 1a, and 2 Mb from the PCM transmission line B is input.
It, 30-channel PCM data is input to the signaling unit 1b. In the signaling extraction units 1a and 1b, only the signaling information is extracted from the PCM data and sent to the selection units 2a and 2b. The selection unit 2a sends only the direct channel signaling information sent from the signaling extraction unit 1a to the direct channel format conversion unit 3a based on the control signal from the control unit 5, and formats the signaling information of the channels other than the direct channel. Send to the conversion unit 4a. Similarly, the selection unit 2b sends the signaling information of the direct channel from the signaling extraction unit 1b to the format conversion unit for direct channel 3b, and the signaling information of the other channels to the format conversion unit 4b.
In the example of FIG. 4, A2 and B4 are selected as the direct channels. Direct channel format converter
In 3a and 3b, only the signaling information of the direct channel designated by the control signal from the control unit 5 is rearranged. In the format conversion units 4a and 4b, predetermined channels corresponding to the direct channels are deleted based on the control signal from the control unit 5, and each channel other than the direct channels is arranged after the 2-bit signaling information. Replacement is performed. In FIG. 4, the A1 channel is deleted corresponding to the A2 direct channel, and the B3 channel is deleted corresponding to the B4 direct channel. In this way, the format converters 3a, 3b, 4a, 4b
The signaling information whose format has been converted by
After being sent to and combined with the ADPC,
It is inserted into M data and sent to the ADPCM transmission line as 2Mbit / s, 60-channel ADPCM data.

(Problems to be Solved by the Invention) However, in the transcoder device having the above-described configuration, the format conversion units 3a, 3b, 4a, 4b are deleted in correspondence with direct channels, channels other than direct channels, and direct channels. Since it is necessary to supply and control a control signal for designating a channel such as a channel from the control unit 5, there is a problem that the circuit configuration becomes complicated by a circuit related to the control.

It is an object of the present invention to solve the above-mentioned problems and to provide a transcoder device capable of simplifying the circuit configuration of a format conversion unit.

(Means for Solving the Problem) In order to solve the above problems, the present invention provides n-channel PCM data from the first transmission line and n channels from the second transmission line.
In a transcoder device for converting channel PCM data into 2n-channel ADPCM data and sending it to a second transmission line, (a) extracting signaling information from each PCM data from the first and second transmission lines First and second extraction means, (b) first of the signaling information from the first extraction means, the signaling information of a predetermined channel is rearranged in the order of channels in a predetermined frame unit.
Format conversion means, (c) second format conversion means for halving the signaling information of all channels from the first extraction means and rearranging in a predetermined frame unit channel order, (d) Third format conversion means for rearranging the signaling information of a predetermined channel among the signaling information from the second extraction means in a predetermined channel order of frame units,
(E) Fourth format conversion means for halving the signaling information of all channels from the second extraction means and rearranging in a channel order of a predetermined frame unit, and (f) based on the selection signal First selecting means for selecting output information of the first and second format converting means, and (g) second selecting means for selecting output information of the third and fourth format converting means based on a selection signal, (H) combining means for combining the output information of the first and second selecting means, and (i) inserting means for inserting the output information of the combining means into the ADPCM data.

(Operation) The technical means of the present invention operates as follows. The first format conversion means operates to rearrange a predetermined channel, ie, the direct-enabled channel, in the order of the frame-based channels, which is predetermined, among the signaling information of all the channels extracted by the first extraction means. The second format conversion means functions to halve the signaling information of all the channels extracted by the first output means and to rearrange the channel order in a predetermined frame unit. The third and fourth format converting means also work to perform the same processing as the first and second format converting means on the signaling information of all the channels extracted by the second extracting means. The first selecting means operates to select the output information of the first and second format converting means based on the selecting signal, and the second selecting means also operates the third and fourth format converting means based on the selecting signal. Works to select output information. The signaling information selected by the first and second selecting means is combined by the combining means and then inserted into the ADPCM data by the inserting means. Therefore, when designating a direct channel, the selection signal causes the first selection means to select the output information of the first format conversion means, or the second selection means causes the main information of the third format conversion means. Is selected and the direct channel is not designated, the selection signal causes the first selection means to select the output information of the second format conversion means, or
The second selection means may select the output information of the fourth format conversion means. Therefore, it is not necessary to specify a channel for the first to fourth format converting means, and the problems of the above-mentioned conventional technique can be solved.

(Embodiment) FIG. 1 is a block diagram of a transcoder device showing an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 3 denote the same components. 8a is a direct channel format conversion unit that performs format conversion to rearrange the signaling information of the direct capable channels from the signaling extraction unit 1a in a predetermined frame unit channel order, and 8b is output information of the signaling extraction unit 1b. On the other hand, a direct channel format conversion unit that performs the same format conversion as the format conversion unit 8a,
9a is a format conversion unit that converts the signaling information of all channels from the signaling extraction unit 1a to 2 bits and performs a format conversion that rearranges in a predetermined frame unit channel order, and 9b is similar to the output information of the signaling extraction unit 1b. A format conversion unit that performs various format conversions, 10a is a selection unit that selects either output of the format conversion units 8a and 9a based on a control signal (selection signal), and 10b is a format based on the control signal (selection signal). A selection unit that selects one of the outputs of the conversion units 8b and 9b, 11 a control unit that supplies a control signal to the selection units 10a and 10b to perform control, and 12 combines the output information of the selection units 10a and 10b. It is a connecting part.

FIG. 2 is a time chart showing the operation of this embodiment.
The structure of the input / output frame and the direct-capable channel are exactly the same as in the case of FIG.

Next, the operation of this embodiment will be described.

In the same manner as conventional, the signaling information extracted by the signaling unit 1a is input to the format conversion units 8a, 9a,
The signaling information extracted by the signaling unit 1b is input to the format conversion units 8b and 9b. In the format conversion unit 8a, of the signaling information of all channels from the signaling extraction unit 1a, only the signaling information of direct-enabled channels is rearranged in a predetermined channel order, and then sent to the selection unit 10a. In the format conversion unit 9a, for each channel of the signaling information from the signaling extraction unit 1a, 4 bits (a, b,
After being changed from c, d) to 2 bits (a, b) and rearranged in a predetermined channel order, the data is sent to the selection unit 10a. The format conversion units 8b and 9b also perform the same format conversion on the output information of the signaling extraction unit 1b, and the converted signaling information is sent to the selection unit 10b. In the example of FIG. 2, A16, A2, A4, A19 ... B16, B2, B4, B19
.. is a direct-enabled channel, but the A16 channel is not shown in the output frame of the format conversion unit 8a shown in FIG. 2 because the order is after the beginning of the frame.

The selection unit 10a selects the output information of the format conversion units 8a and 9a based on the control signal from the control unit 11. Selector 10b
Similarly, the output information of the format conversion units 8b and 9b is selected. In the example of FIG. 2, the output information of the direct channel format conversion units 8a and 8b is selected only at the timing of the A2 and B4 channels, and the format conversion units 9a and 9b are selected at the other timings. You can see that

In this way, the signaling information selected by the selecting units 10a and 10b is sent to the combining unit 12 and combined therewith, and then inserted into the ADPCM data by the signaling extracting unit 7 and sent to the ADPCM transmission line in the same manner as in the prior art. .

(Effects of the Invention) As described in detail above, according to the present invention, a predetermined channel (that is, a channel that can be a direct channel) of the signaling information of all channels by the first and third format conversion means. ) Is subjected to frame conversion for a direct channel, normal frame conversion is performed for signaling information of all channels by the second and fourth format conversion means, and a selection signal is given to the first and second selection means. As a result, the output information of the first to fourth format conversion means is selected,
The control for channel designation is unnecessary for the first to fourth format conversion means. Therefore, the control circuit for specifying the channel of each format conversion means, which has been conventionally required, is not required, and the circuit configuration of the portion related to the frame conversion of signaling information can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram of the main parts of a transcoder device showing an embodiment of the present invention, FIG. 2 is a time chart showing the operation of the present embodiment, and FIG. 3 is a block diagram of the main parts of a conventional transcoder device. FIG. 4 is a time chart showing the operation of the conventional device. 1a, 1b …… Signaling extraction section, 7 …… Signaling insertion section, 8a, 8b …… Direct channel (D.ch) format conversion section, 9a, 9b …… Format conversion section, 10a, 10b
…… Selection section, 12 …… Coupling section.

Claims (1)

[Claims] 1. 2n of n-channel PCM data from the first transmission line and n-channel PCM data from the second transmission line
In a transcoder device for converting to channel ADPCM data and transmitting to the third transmission path, (a) first and second signaling information is extracted from each PCM data from the first and second transmission paths. Extracting means, (b) first format converting means for rearranging the signaling information of a predetermined channel among the signaling information from the first extracting means in the order of a predetermined frame unit channel, (c) the first Second format conversion means for halving the signaling information of all the channels from one extraction means and rearranging the channels in a predetermined frame-by-frame order, (d) of the signaling information from the second extraction means A third format in which the signaling information of a predetermined channel is rearranged in the order of channels in a predetermined frame unit And (e) fourth format conversion means for halving the signaling information of all channels from the second extraction means and rearranging in a predetermined frame-unit channel order, (f) based on the selection signal First selection means for selecting output information of the first and second format conversion means, and (g) second selection means for selecting output information of the third and fourth format conversion means based on a selection signal. Selecting means, (f) combining means for combining the output information of the first and second selecting means, and (i) inserting means for inserting the output information of the combining means into the ADPCM data. And a transcoder device.