JPH04256237A - Multimedia multiplex device - Google Patents

Abstract

PURPOSE:To improve the use rate of a high speed digital line even if the number of storing signals is large by permitting a low speed line terminating part to correspond to the change of data speed in a terminal and modulation/ demodulation devices. CONSTITUTION:A multimedia multiplex device 4 stores the terminal 1 through the modulation/demodulation devices 2 and 3 changing transmitting data speed in accordance with the line state of a low speed line and interfaces the high speed digital line through a line terminating device 8. The multimedia multiplex device 4 is composed of the low speed line terminating part 5 interfacing the signal form of the modulation/demodulation device 3, a signal supervisory part 9 supervising inputted data speed, a multiplex part 6 multiplexing input data from the other terminal and the high speed line terminating part 7 interfacing the line terminating device 8.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a multimedia multiplexing device that connects to a high-speed digital line and multiplexes and transmits signals such as audio, data, and video, and in particular, the present invention relates to a multimedia multiplexing device that connects to a high-speed digital line and multiplexes and transmits signals such as audio, data, and video. This invention relates to terminals and modem accommodating functions that have variable line diagnostic functions.

0002

2. Description of the Related Art Conventionally, when connecting this type of terminal, a switching device was used to switch the low-speed line termination corresponding to the data speed. A conventional example is shown in FIG. In FIG. 2, a signal from a terminal 1 passes through normal modulation and demodulation devices 2 and 3, and then passes through a switch 10 to a low-speed line termination section 12, a multiplexing section 6, and a high-speed line termination section 7 of a multimedia multiplexer 4. The signal is transmitted to the high-speed digital line via the line termination device 7.

Next, depending on the line condition of the transmission path 13, the signal speed of the modem devices 2 and 3 varies from, for example, 9.6 Kbps to 4.0 Kbps.
If the speed changes to 8Kbps, operate the switch 10 to change the speed to 4.8K, which has been prepared in advance in the multimedia multiplexing device 4.
This was handled by switching to a low-speed line termination unit 11 that supports bps.

0004

[Problems to be Solved by the Invention] The conventional method described above requires the same number of low-speed line terminations as the types of data speeds of the terminals to be accommodated, and also requires as many switching devices as the number of terminals to be accommodated. do. Furthermore, it is necessary to allocate multiple channels (2 channels in Figure 2) corresponding to the data speed to the high-speed digital line, which reduces the efficiency of using the high-speed digital line and causes waste, especially when the amount of data is large. It is economical and also has drawbacks such as increased equipment space.

An object of the present invention is to provide a multimedia multiplexing device that automatically responds to changes in the data speed of the terminals it accommodates.

[0006]

[Means for Solving the Problems] The multimedia multiplexing device of the present invention accommodates various terminals such as audio, video, and data via a low-speed line and a modem, and multiplexes signals from each terminal. A multimedia multiplexing device for transmitting via a high-speed digital line, comprising: a low-speed line termination section having automatic data speed control means; and an input signal monitoring section for detecting changes in the data speed of an input signal; In the monitoring unit, the modem detects a speed change of the input signal in which the data speed of the transmission signal is changed in response to the line condition of the low-speed line, generates data speed control information, and sends it to the low-speed line termination unit; The data speed automatic control means included in this low-speed line termination section generates a data signal corresponding to the data speed of the input signal.

[0007]

[Embodiment] Next, the present invention will be explained with reference to the drawings. Figure 1 is a block diagram showing an embodiment of the present invention. Modulators 2 and 3 that change the data speed
The terminal 1 is accommodated through the terminal 1, and the terminal 1 is interfaced with a high-speed digital line through the line termination device 8. The multimedia multiplexing device 4 includes a low-speed line termination section 5 that interfaces with the signal form of the modem device 3, a signal monitoring section 9 that monitors the input data speed, and a signal monitoring section 9 that monitors input data speed from other terminals (not shown). A multiplexing unit 6 for multiplexing and a line termination device 8
and a high-speed line termination section 7 that interfaces with the terminal.

[0008] Here, an example will be described in which data sent from the terminal 1 is initially transmitted at 9.6 Kbps by the modem devices 2 and 3, but is now transmitted at 4.8 Kbps due to a change in the line condition of the low-speed line. Note that the low-speed line termination section 5 is configured as shown in 9.
Assume that it is preconfigured to interface to a data speed of 6 Kbps.

[0009] The data sent by the terminal 1 is transmitted to the modulation/demodulation device 2.
. The signal monitoring section 9 constantly monitors the data speed of the input signal.

[0010] The input data from the terminal 1 is converted into a predetermined signal format by the low-speed line termination section 5, multiplexed with a plurality of data input from other terminals (not shown) at the multiplexing section 6, and further The high-speed line termination section 7 converts the signal into a predetermined signal format, and outputs it to the high-speed digital line via the line termination device 8.

When the signal monitoring section 9 detects that the data speed of the input signal has changed from 9.6 Kbps to 4.8 Kbps, it controls the data speed automatic control circuit (not shown) of the low-speed line termination section 5 to change the input signal data speed from 9.6 Kbps to 4.8 Kbps. Adapt to the data rate of the signal. The data of the terminal 1 that is compatible with the data speed of 4.8 Kbps is multiplexed with the data of other terminals in the multiplexer 6, and sent out to the high-speed digital line via the high-speed line termination unit 7 and line termination device 8. .

[0012] When the multiplexing unit multiplexes input data with input data from other terminals, if the data speeds are different, multiplexing is performed into a plurality of channels.

[0013]

Effects of the Invention As explained above, the present invention copes with changes in the data speed of terminals and modems at the low-speed line termination section, so even when a large number of signals are accommodated, the use of high-speed digital lines can be made more efficient. will improve. Furthermore, since there is no need to prepare multiple switching devices or low-speed line terminals with different data speeds, the installation space can be reduced and it is economical.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram of a conventional example.

[Explanation of symbols]

1 Terminals 2, 3 Modulation/demodulation device 4 Multimedia multiplexing device 5, 11, 12 Low-speed line termination section 6 Multiplexing section 7 High-speed line termination section 8 Line termination device 9 Input signal monitoring section 10 Switching device

Claims (1)

[Claims] Claim 1: A multimedia multiplexing device that accommodates various terminals such as audio, video, and data via a low-speed line and a modem, and multiplexes signals from each terminal and transmits the signals via a high-speed digital line. , comprising a low-speed line termination section having automatic data speed control means, and an input signal monitoring section for detecting changes in the data speed of the input signal,
In the input signal monitoring unit, the modem detects a speed change of the input signal by changing the data speed of the transmission signal in response to the line condition of the low-speed line, generates data speed control information, and sends the data speed control information to the low-speed line termination unit. A multimedia multiplexing device, characterized in that the low-speed line termination section generates a data signal corresponding to the data speed of the input signal by the data speed automatic control means included in the low-speed line termination section.