JPS6161156B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telemetry encoder device that is installed in, for example, an artificial sanitary vehicle and transmits data.

FIG. 1 is a format diagram showing an example of a telemetry frame format of a conventional telemetry encoder device. In the figure, 1 is a frame synchronization pattern, and 2 ₁ to 2 _o are word channels 1 to n.

The telemetry frame format of a conventional telemetry encoder device is configured as described above.
A frame synchronization pattern 1 of several words is placed at the beginning of the telemetry mainframe, and a unique word channel 2 ₁ ~ for each word of fixed word length is placed below.
The method was to allocate 2 _o and transmit it in series.

However, there are ways to increase the transmission capacity of a telemetry system, such as increasing the bit rate, increasing the number of words in the main frame, and installing subframes within the main frame.
The first method causes deterioration of transmission quality, and the second method
The third method had the drawback that the sampling time for each word was long and the ability to follow changes in measurement items was poor.

Furthermore, some telemetry encoder apparatuses have conventionally prepared two or more types of telemetry frame formats and selected and used those modes depending on the purpose. That is, a method has been implemented that uses a frame format consisting only of particularly important telemetry items and a frame format consisting of all telemetry items including other telemetry items.

According to this method, when the former format is selected to improve followability to changes in measurement items, the telemetry capacity decreases, and conversely, when the latter format is selected to increase the telemetry capacity, the sampling time of each data decreases. It had the disadvantage that it became longer and the followability deteriorated.

The object of the present invention is to provide a telemetry encoder device that can equivalently increase the transmission speed without increasing the bit rate.

FIG. 2 shows a telemetry frame format showing one embodiment of the present invention, and 1, _{2 1} to 2 _o are exactly the same as those of the conventional device described above. 3 ₁ ~ 3 _o
Identification codes 4 ₁ to 4 _o of each word channel are variable frame data composed only of word data in which the latest data of each word channel and the data one frame before are different.

FIG. 3 is a block wiring diagram showing an embodiment of the present invention, in which 11 is an analog telemetry input terminal, 12 is an analog multiplexer that sequentially outputs various types of signals from this input terminal 11 in a time-division manner, and 13 is an A/D converter that converts this analog multiplexer output into a digital signal, 1
4 is a digital telemetry input terminal; 15 is a digital multiplexer that sequentially outputs various types of signals from this input terminal 14 in a time-division manner; 16 is a control device; 17 is a data bus that sends control signals and data from this control device; 18 to 21 are first register groups for words a, b, c...n, respectively; 22
~25 are the second for words a, b, c...n, respectively.
The register group 26 is a serial PCM signal output section.

In the telemetry encoder device configured as described above, analog telemetry input is stored as PCM data in registers 20 to 21 through analog multiplexer 12 and A/D converter 13. On the other hand, digital inputs are stored in registers 18 and 19 through digital multiplexer 15. The first register group 18-21 stores all the latest words of telemetry, and the data of each word one cycle before is stored in the second register group 22-25, respectively.

The data from one cycle before is compared with the current data according to an instruction from the control device 16, and the word identification code and data of the word whose data has changed are supplied to the serial PCM signal output unit 26 and output as PCM data. .

The control device 16 instructs the PCM signal output section 26 to insert a frame synchronization signal when the telemetry frame completes one cycle, and starts the next cycle.
The data in the first register group 18-21 is shifted to the second register group 22-25. FIG. 2 shows an example of the telemetry frame format edited as described above.

Next, the transmission speeds of the telemetry encoder device of the present invention and the conventional telemetry encoder device will be described.

FIG. 4 is a time chart showing the relationship between the processing time of a conventional telemetry encoder device and the transmission time of PCM telemetry output. In the conventional method, the time of one telemetry cycle (frame cycle) is determined by the bit rate, assuming the number of words included in the frame is constant, and the telemetry encoder device performs data multiplexing and A/D conversion within this time. Let's do it. Even if the data processing time of the telemetry encoder device was shortened, the data transmission speed could not be increased unless the bit rate changed.

FIG. 5 is a time chart showing the relationship between the processing time of the telemetry encoder device of the present invention and the transmission time of PCM telemetry output. In this method, the word identification code and PCM telemetry data of the changed word are output when the telemetry encoder processing is completed. Since the PCM telemetry output includes only changed words, the time required for transmission is reduced compared to conventional methods. However, according to the device of the present invention, each word includes a word identification code in addition to the data, so if the data of too many words changes, it takes longer than the conventional method, but it is difficult to use, such as telemetry data of artificial sanitation. It is extremely effective in many cases where changes over time are slow. Furthermore, although it is not possible to update frames faster than the processing time of the telemetry encoder, it is possible to speed up the processing time, and this brings out the characteristics of this method.

In the above embodiment, the data word from one frame before is compared with the latest data word, and all the different data is sent out. If only data exceeding this value is sent, there is a greater possibility of further shortening the transmission time.

Furthermore, if a time code is added to the telemetry frame format shown in FIG. 2, storage capacity can be expected to be saved when recording PCM telemetry data using a tape recorder or the like.

Furthermore, it goes without saying that it is possible to construct a telemetry encoder apparatus that can prepare a conventional fixed frame format and a variable frame format of the present invention and select one as required. In this case, by inserting an identification pattern between the conventional fixed frame format and the variable frame format of the present invention after frame synchronization, the receiving side can easily identify these formats. As explained above, the present invention has the effect that the transmission speed determined by the bit rate can be used effectively by selecting and outputting only changed data to configure a variable frame format.

[Brief explanation of the drawing]

FIG. 1 is a format diagram showing an example of a conventional telemetry encoder device, FIG. 2 is a format diagram showing an embodiment of the present invention, FIG. 3 is a block wiring diagram showing an embodiment of the present invention, and FIG. 4 is a format diagram showing an example of a conventional telemetry encoder device. is the processing time and PCM of conventional telemetry encoder equipment
FIG. 5 is a time chart showing an example of the relationship between the telemetry output transmission time and the processing time of the telemetry encoder device of the present invention and the PCM telemetry output transmission time. In the figure, 11 is an analog telemetry input terminal, 12 is an analog multiplexer, and 13 is an A/
D converter, 14 is a digital telemetry input terminal, 15 is a digital multiplexer, 16 is a control device, 18-21 are the first register group, 22-2
5 is a second register group, and 26 is a serial PCM signal output section. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A change detection control device that detects data in which a change exceeding an allowable amount has occurred among all data transmitted by a telemeter device, and only data for which the change is detected by this change detection control device. and a signal output section for creating a multiplexed serial PCM signal with a variable frame configuration. 2. The change detection control device includes a first register group for storing the latest total data word of the total data;
A second register group that stores all data words from the previous frame is compared, and data words of each register of this second register group and each corresponding register of the first register group are compared to detect changes exceeding a permissible value. The telemetry encoder device according to claim 1, further comprising a control device that performs control for detection.