JPH0139049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a multi-pen recorder in which recording pens of a plurality of channels are mounted at mutually shifted positions,
In particular, the present invention relates to improvements in the configuration of a delay circuit and signal delay method for compensating for the positional deviation of each recording pen.

Generally, in this type of multi-pen recorder, as shown in FIG. They are located at different locations.

Now, as shown in FIG.
, the amount of positional deviation between the second recording pen 22 and the second recording pen 22 is L, and similarly, the second recording pen 22 and the third recording pen 32
Let L be the amount of positional deviation between the third recording pen 32 and the fourth recording pen 42, and the amount of positional deviation between the fourth recording pen 42 and the fifth recording pen, respectively.

In order for the recording waveforms by these recording pens to be drawn on the recording paper 3 as synchronized phases, the signal waveforms input to the recording pens below the second recording pen 22 must be
It is necessary to delay the recording paper 3 by a time proportional to the amount of positional deviation with respect to the recording pen 12 in relation to the feeding amount of the recording paper 3.

In general, in a conventional multi-pen recorder of this type, compensation for positional deviation by a delay circuit is performed in synchronization with the timing of normal recording, and its configuration and operation are as follows.

That is, for example, Prior Art I includes a sampling means for sampling an input signal in synchronization with the recording timing, an A/D converter for converting the sampled value by the sampling means into a digital value, and a signal obtained by the A/D converter. A memory that stores and retains the digital value for a predetermined period of time;
It consists of a D/A converter that converts the digital value read from the memory into an analog value, and compensates for the positional deviation of the pen by delaying the input signal for a predetermined period of time. However, this method has the drawback that only sample values at sampling points are employed, resulting in extremely insufficient recorded waveforms in some cases. That is,
As shown in FIG. 1, there are cases where the true waveform (solid line) and the waveform produced by this device (broken line) are significantly different. Here, A, B, C, and D are sampling points that coincide with the recording timing.

Next, a conventional technique proposed to eliminate the above-mentioned drawbacks in the conventional technique will be described.

This prior art device has a basic time interval (between recordings) determined by the timing of recordings.
The purpose is to detect a representative value in some sense and record this representative value.

However, this prior art has a configuration in which the representative value is determined based on the sample value at the start of the basic time interval.

That is, as shown in the recorded waveform of the conventional device indicated by the broken line in FIG. _T2 )
is set as a reference value, and this reference value is sequentially compared with sample values at sampling clocks t1, t2, t3, ..., t9, which have a cycle sufficiently shorter than this basic time interval, and the sample value with the largest deviation is selected. is the representative value.

In the apparatus in this case, the third
There were cases where changes in the recorded waveform at the basic time interval were not reflected.

In addition, this FIG. 3 depicts the true waveform drawn by the dashed-dotted line, the recorded waveform of the conventional device (broken line), and the recorded waveform of the present invention (solid line), which will be described later, for this true waveform, respectively. It is.

The present invention has been made with the aim of solving these conventional techniques, particularly the above-mentioned problems, and has the following objects: 1. To provide a multi-pen recorder that records waveforms with greater fidelity. There are things to do.

Hereinafter, the present invention will be described in detail based on one embodiment of the drawings.

FIG. 2 is a circuit configuration diagram showing one embodiment of the multi-pen recorder of the present invention, particularly in the case of two channels for simplicity, and FIG. This is shown along with the technology.

In Figure 2, 11, 12 and 21, 22
represent the recording pen drive circuit and recording pen of the first channel and the second channel, respectively. 23 shows a comprehensive delay circuit, and A/D converter 2
31, representative value determination circuit 232, representative value memory 23
3. It has a reference value memory 234, a D/A converter 235, and a timing control circuit 236 that constitutes basic time interval setting means. 24 is a sampling means.

First, in the first channel, the input signal is processed by the drive circuit 11 and the like in the same way as in a normal recorder, and then applied to the recording pen 12 for normal analog continuous recording without delay.

On the other hand, in the second channel, the input signal is sampled by the sampling means 24 at a cycle shorter than the basic time interval described later, digitized by the A/D converter 231, and then sent to the representative value determining circuit 2.
Sent to 32. The representative value determining circuit 232 compares the input signal digitized in this manner (hereinafter referred to as a comparison value) with a reference value input from the reference value memory 234, and outputs a representative value as its output. This output result is stored in the representative value memory 23.
3. In this case, the representative value determining circuit 23
3 calculates the absolute value (deviation) of the difference between the reference value and the comparison value, compares the magnitude of the deviation with the previous comparison value, and only adopts the larger or equal value, so
Ultimately, the one with the largest deviation from the reference value will be selected. Note that this representative value determination is performed at every basic time interval.

Now, the representative value determined in this way is held in the representative value memory 233, and after being delayed for a predetermined time (pen position deviation), it is converted into an analog value by the D/A converter 235, and the recording pen drive circuit 21
The image is then recorded by the recording pen 22. Further, the representative value determined at this time is further sent to the reference value memory 234, and is employed as a reference value for determining the representative value in the next basic time interval. Note that the timing control circuit 236 generates a clock signal for controlling the basic time interval (double arrow in FIG. 2) and the sampling timing (arrow in FIG. 2).

This will be explained in more detail with reference to FIG.

First, since there is no change in the input signal ei during the first basic time interval determined by time T ₁ and time T ₂ , the sample value ei (T ₂ ) at time T ₂ is recorded at time T ₂ . Therefore, the sample value ei(T ₂ ) at time T ₂ is adopted as the reference value for determining the representative value in the second basic time interval.

Next, in the second basic time interval, first, the reference value ei (T ₂ ) and the comparison value ei (t ₁ ) are compared, and the comparison value ei (t ₁ ) and the deviation |ei (T ₂ )− Obtain ei(t ₁ ) |

Next, compare ei(T ₂ ) and ei(t ₂ ), and get the comparison value
ei (t ₂ ) and _the deviation |ei ( _{T 2 )} −ei( _{t 2} )|
(t ₂ ) | and only those values with larger or equal deviations are adopted. Therefore, in this case, the comparison value ei(t ₂ ) is stored in the representative value determining circuit 232 at this point.
is maintained along with its deviation |ei(T ₂ )−ei(t ₂ )|.

Thereafter, the value (data) finally indicating the maximum deviation from the reference value is held in the same way.

That is, the same operation as above takes place over the remaining part of this basic time interval, so that the second
The standard value ei is the representative value in the basic time interval of
Sample value at time t ₄ showing maximum deviation from (T ₂ )
ei( _t4 ) is selected and recorded at time _T3 . Then, this representative value ei(t ₄ ) becomes a reference value for determining the representative value in the third basic time interval.

Thereafter, the same operation is performed for the third basic time interval and the fourth basic time interval, and as a result, the solid line waveform shown in FIG. 3 is drawn.

As is clear from the above description, the configuration described in the claims of the present invention has the advantage that recording waveforms with high fidelity can be obtained.

[Brief explanation of drawings]

FIG. 1 shows a recording waveform diagram in a general multi-pen recorder. Fig. 2 is a block diagram showing the electrical circuit configuration of an embodiment of the multi-pen recorder of the present invention, and Fig. 3 explains the basic principle of the invention and the operation of the embodiment shown in the second figure. FIG. 4 is an explanatory diagram schematically showing the pen arrangement of a general multi-pen recorder. In the figure, 11, 12... Recording pen drive circuit in the first channel, recording pen, 21, 22
... Recording pen drive circuit in the second channel,
Recording pen, 23...Delay circuit, 24...Sampling means, 232...Representative value determination circuit, 234...
...Reference value memory, 233...Representative value memory.

Claims (1)

[Scope of Claims] 1. A multi-pen recorder in which recording pens of a plurality of channels are mounted at positions shifted from each other, wherein the recording pens of at least one channel sequentially record the output value of a delay circuit that compensates for the positional shift. In the multi-pen recorder, the delay circuit includes: basic time interval setting means for setting a basic time interval synchronized with the recording timing; sampling means for sampling the input signal with synchronization shorter than the basic time interval; representative value determining means for determining the representative value of each of the basic time intervals based on the sample values obtained by the means; A reference value memory that holds the reference value for determination, and sequentially compares the reference value held in this reference value memory with the sample value within the basic time interval,
a representative value determining circuit that selects the sample value with the maximum deviation as the representative value in the basic time interval; a representative value memory that temporarily holds the representative value determined by the representative value determining circuit; 1. A multi-pen recorder comprising: means for recording a representative value; and means for updating and retaining the representative value in the reference value memory as a reference value for the next basic time interval.