JPH0631793Y2 - Reception level signal transmission circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application of the present invention> The present invention relates to a reception level signal transmission circuit used for a remote control type receiver at a coast station, for example.

<Prior Art> (Fig. 3) The level signal from a plurality of receivers at the receiving station of the coast station is converted into serial data by using one telephone line at the communication station. The transmission system has a configuration as shown in Fig. 3. Has become.

That is, at the receiving station, the N receivers 2-1 to 2-n receive the radio signals by the respective antennas 1-1 to 1-n and output the level signal of N channel indicating the level of the received signals. To do. The N channel level signals are sequentially selected one by one by the data selector 3 and digitally converted by the A / D converter 4. The data sampled in this way is converted into serial data by the transmission control circuit 5 and sent to the telephone line 7 in order via the modulation / demodulation circuit 6.

The signal sent to the telephone line 7 is demodulated into serial data by the modulation / demodulation circuit 8 of the communication station, converted into parallel data by the transmission control circuit 9 and converted into analog by the D / A converter 10, and then the data selector 11 Through the meter 12-1
12-n is sent to the meter corresponding to the receiver. An average corresponding to the magnitude of the level signal input intermittently, that is, an instruction corresponding to the DC component of the signal is continuously given to each meter, and the received signal level of each receiver is communicated by this meter instruction. It can be confirmed on the local side.

Therefore, the transmission speed of the telephone line used for the transmission of this data can be transmitted only at a prescribed speed (for example, 1200 bps or the like) predetermined by the line.

For this reason, in the above-mentioned conventional transmission system, the data obtained by one sampling for the level signal of one receiver has a time interval required for transmitting the data once over the telephone line at a prescribed speed. , The channel of the data selector 3 was switched.

<Problems to be Solved by the Present Invention> However, in such a transmission system, the sampling interval for the level signal of one channel is N
Only the time required to send the serial data for the channel to the telephone line must be provided. This time becomes longer as the number of channels per line increases, and even if the level of the level signal fluctuates greatly during this time, there is a problem that the data receiving side cannot recognize this level change.

An object of the present invention is to provide a reception level signal transmission circuit that solves the above problems.

<Means for Solving the Problems> In order to achieve this object, the reception level signal transmission circuit of the present invention is an N channel (N) output from a plurality of receivers (22).
A plurality of level signals are sequentially and cyclically selected for each channel, and sampling means (23, 24) for digitally converting and outputting the selected level signals, and data sampled by the sampling means. And serial transmission means (26, 27) for converting the serial data and outputting the signal modulated by the serial data to the line at a transmission rate predetermined by the line, and the level signal data of the N channel. In a time-divisional transmission through the line, wherein the sampling means performs sampling on the level signal of the same channel at an interval capable of detecting an expected level change of the level signal. And multiple times within the time T required for the serial transmission means to send the serial data for N channels to the line. Averaging means (25) for averaging the data output from the sampling means for each channel is provided between the sampling means and the serial transmission means. The serial transmission means sends the average level data averaged for each channel by the averaging means to the line for N channels per T time as level signal data of each channel.

<Operation> With this configuration, in the reception level signal transmission circuit of the present invention, the sampling per channel is performed at intervals such that the level change of the level signal can be detected, and the serial transmission means is the serial channel for N channels. The average level data obtained by averaging a plurality of sampling data is performed at a rate of a plurality of times within the time T required to send the data to the line, and is serially transmitted to the line in the order of channels.

Therefore, when the level of the level signal changes within the time T, the average level data including the change is sent to the line as the next data.

<One Embodiment of the Present Invention> (FIGS. 1 and 2) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram of one embodiment, and FIG. 2 is a detailed diagram of an averaging circuit.

In the figure, the antennas 21-1 to 21-6 to the modulation / demodulation circuit 27 are the receiving station of the coast station, and the modulation / demodulation circuit 29 to the meter 33-1 to.
It is a communication station up to 33-6.

One for each of the six antennas 21-1 to 21-6 at the receiving station
The receivers 22-1 to 22-6 are connected to the respective units, and the 6-channel level signals from the receivers 22-1 to 22-6 are input to the data selector 23.

The data selector 23, together with an A / D converter 24, which will be described later, constitutes the sampling means of this embodiment, and selects and outputs the level signals of 6 channels sequentially and cyclically for each channel.

In this data selection operation (sampling operation), with respect to the level signal of one channel, the serial transmission means, which will be described later, transfers the serial data for six channels to the telephone line at intervals at which the expected level change of the level signal can be detected. Is performed at a rate of 10 times, for example, during the time T required to send the data to the. That is, the channel switching of the data selector 23 is performed 60 times (6 × 10) per T time.

The level signal output from the data selector 23 is A /
The digital conversion is sequentially performed by the D converter 24, and the converted value is output to the averaging circuit 25 as data of each level signal.

The averaging circuit 25 sequentially averages the data output from the A / D converter 24 in the order of channels for each receiver (each channel).

The average level data of each channel averaged by the averaging circuit 25 is converted into serial data by the transmission control circuit 26 at the transmission rate specified by the telephone line 2,
It is sent to the telephone line 28 via the modulation / demodulation circuit 27. The transmission control circuit 26 and the modulation / demodulation circuit 27 constitute the serial transmission means of this embodiment.

Here, the averaging calculation cycle for each channel in the averaging circuit 25, that is, the interval from the selection of one channel by the data selector 23 to the next selection of the channel is determined by the telephone line from the modulation / demodulation circuit 27. This is about 1/10 of the time T required to serially transmit the average level data for 6 channels to 28.

The average level data transmitted from the telephone line 28 to the communication place is converted into an analog average level signal through the modulation / demodulation circuit 29, the transmission control circuit 30 and the D / A converter 31 in reverse to the reception place. The average level signal for each receiver output from the D / A converter 31 is input to the data selector 32, and is input to the meters 33-1 to 33-6 corresponding to the receivers 22-1 to 22-6. Supplied selectively. Each meter is
The direct current component proportional to the magnitude of the intermittently input signal is continuously instructed.

Next, the configuration of the averaging circuit 25 will be specifically described with reference to FIG. In the figure, a register 35-1 and a 1/2 circuit 36-1 are for averaging the sampling data of the level signal from the receiver 22-1, and are similarly circuits for the receivers 22-2 to 22-6. (Register 35-2 and 1/2 circuit 36-2, ...
A register 35-6 and a 1/2 circuit 36-6) are also provided.

Here, the data of each channel is selectively input to one end of each 1/2 circuit 36-1 to 36-6, and the output of the registers 35-1 to 35-6 is input to each other end. Data is being entered. Then, each 1/2 circuit 36-1 to 36-6 adds both input data and halves the result, and sets the resulting data in its own registers 35-1 to 35-6.

Therefore, the weighted average level data is stored in each of the registers 35-1 to 35-6 as newer data is stored.

Here, the sampling for each one channel is
Since the average level data for 6 channels is transmitted 10 times while being serially sent to the line, when new data is input 10 times to each 1/2 circuit, the average level data is sent to the line. It will be.

It should be noted that this averaging process can be performed without any change even if the number of samplings for each channel per T time is 10 or more.

<Operation of the Embodiment> The operation of this embodiment will be described. Antennas 21-1 to 2
Bell signals corresponding to signals received by the receivers 22-1 to 22-6 via 1-6 are provided to the data selector 23. The data selector 23 sequentially selects and outputs the level signals for 6 channels, one channel at a time, and supplies them to the A / D converter 24.

That is, the selection cycle per channel is such that the level change of the level signal can be detected, and the selection level is selected 10 times within the time required to send the average level data for 6 channels to the line. The signal from the receiver 22-1, the signal from the receiver 22-1, ..., The signal from the receiver 22-2 are selected and output in this order, and this selecting operation is cyclically repeated.

The level signal selectively output from the data selector 23 is
It is digitally converted by the A / D converter 24 and selectively input to one end of the corresponding 1/2 circuits 36-1 to 36-6 in the averaging circuit 25.

Here, for example, when the 1/2 circuit 36-1 receives the data of the level signal of the receiver 22-1 from the A / D converter 24, this data and the data previously set in the register 35-1 are Is added, the averaging operation for halving the addition result is performed, and the value obtained by the averaging operation is set in the register 35-1. When the data in the register 35-1 is updated 10 times, the final average level data is sent to the transmission control circuit 26, converted into serial data, and sent to the telephone line 28 via the modulation / demodulation circuit 27. It

Note that this operation is performed in exactly the same manner for the 1/2 circuits 36-2 to 36-6 at different timings, and the average level data of the remaining channels are sequentially transmitted to the line following this channel. .

While the average level data of the remaining channels is being transmitted to the line, the data of the receiver 22-1 which is selectively output from the data selector 23 and digitally converted is continuously output to the 1/2 circuit 36-1. Is input to the data, and the averaging operation is performed on the data.

Therefore, the sampling of the level signal of each channel is performed at extremely high speed and continuously compared with the transmission time of serial data for N channels determined by the line.

The average level data of each receiver transmitted from the telephone line 28 to the modulation / demodulation circuit 29 of the communication station is transmitted to the transmission control circuit 30,
It is selectively applied to the meters 33-1 to 33-6 corresponding to each receiver via the D / A converter 31 and the data selector 32. An instruction (DC component) following the magnitude of the reception level signal intermittently input is continuously given to each meter.

Here, the level of the level signal output from the receiver is the same channel transmission period T for the telephone line 28.
Even if it changes during the period, the level signal is surely sampled and averaged, so that the change amount is surely included in the average level data transmitted to the telephone line next time. Therefore, there is no fear that the instruction contents on the meters 33-1 to 33-6 will be greatly deviated from the level change of the level signal, and the level change can be recognized by the communication place side.

<Effects of the Present Invention> Since the present invention is configured as described above, when the level signal data of a plurality of channels is serially transmitted in a time division manner to a line having a predetermined transmission speed, the level signal is transmitted through the line. Even when the level changes quickly with respect to the transmission speed of, the data including the change can be transmitted,
The level change can be surely grasped by the data from the line.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of the averaging circuit 25, and FIG. 3 is a conventional system configuration diagram. 21-1 to 21-6 ... antenna, 22-1 to 22-6 ... receiver, 23 ... data selector, 24 ... A / D converter,
25 ... Averaging circuit, 26 ... Transmission control circuit, 27 ...
Modulation / demodulation circuit, 28 ... Telephone line, 33-1 to 33-6 ... Meter, 35-1 to 35-6 ... Register, 36-1 to 36-6 ...
... 1/2 circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Tetsuya Miyoshi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (72) Yoshitaka Okitsu 5-1027 Minamiazabu, Minato-ku, Tokyo Within Anritsu Co., Ltd. (72) Fumio Abe 5-10-27 Minamiazabu, Minato-ku, Tokyo Anritsu Co., Ltd. Examiner Hiroshi Tanikawa

Claims (1)

[Scope of utility model registration request] 1. N-channel (N is a plurality) level signals output from a plurality of receivers (22) are sequentially and cyclically selected one channel at a time, and the selected level signals are digitally converted. Outputting sampling means (23,
24), and serial transmission means (26, 27) for converting the data sampled by the sampling means into serial data and outputting a signal modulated by the serial data to the line at a transmission rate predetermined by the line. A receiving level signal transmission circuit for transmitting the data of the level signal of the N channel in a time division manner via the line, wherein the sampling means performs sampling for the level signal of the same channel. It is arranged such that an expected level change of a signal can be detected and at a rate of a plurality of times within a time T required for the serial transmission means to send out serial data for N channels to the line. In addition, the data output from the sampling means is transferred between the sampling means and the serial transmission means. An averaging means (25) for averaging for each channel is provided, and the serial transmission means uses the average level data averaged for each channel by the averaging means as the level signal data of each channel on the line. A reception level signal transmission circuit for transmitting N channels per T time.