JPS6020007Y2 - Analog signal time width changing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an analog signal time width changing device suitable for use in conjunction with analog storage devices and the like.

Conventionally, when recording sounding data obtained with an acoustic sounding instrument on recording paper using a storage device using a pen or discharge needle, an electric motor with a speed proportional to the underwater propagation speed of the acoustic signal moves the pen or discharge needle to the recording paper. (repeatedly at each measurement period) in a direction perpendicular to the direction of travel.

Therefore, the recording range of the recording device can be expanded or reduced by changing the speed of the electric motor, but it is not easy to change the speed of the electric motor over a wide range, and especially when the electric motor is operated at a low speed, uneven rotation may occur. This makes it difficult to maintain high recording accuracy and quality.

In view of this, an object of the present invention is to provide an analog signal time width changing device that can arbitrarily and widely change the recording range without changing the motor speed of the recording device.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in the broken line frame in FIG. 1, the time axis conversion device according to the present invention includes a circuit 1 for sampling an analog measurement signal inputted from a terminal Tin, and an analog amplitude sampled by the circuit 1. Converting values to digital values A/
A D converter 2, and a first memory circuit 3 and a second memory circuit 4 that alternately write and read output signals of the A/D converter 2 using write and read signals from a control pulse generation circuit 6, which will be described later. , a D/A converter 5 that converts digital values read from both storage circuits 3 and 4 into analog values, and a control pulse generation circuit 6, which will be described later.

The control pulse generation circuit 6 includes the sampling circuit 1
sampling pulse for the A/D converter 2
and the conversion start pulse for the first storage circuit 3.
The write pulse and the read pulse for the second memory circuit 4 are output in synchronization with a signal from the memory circuit 11, which will be described later.

Further details regarding the control pulse generation circuit 6 are as follows.
The circuit 6 sends the write pulse and the read pulse alternately to the memory circuits 3 and 4 by the number N of memories in the circuits 3 and 4, and sends the sampling pulse and the write pulse to each other. They are configured to transmit at equal frequencies.

On the other hand, numerals 7 to 12 shown outside the dashed line frame in the figure are components of the acoustic sounding instrument.

That is, 7 is a transmitter of an acoustic signal, 8 is a transmitter that sends a sonic or ultrasonic signal into the water by the output from the transmitter 7, and 9 is a target object of the acoustic signal sent from the transmitter 8. a receiver that receives reflected waves from (for example, the ocean floor 13);
10 is a receiver for amplifying and detecting the echo signal received by the receiver 9; 11 is a pen or a receiver;

The discharge needle type recording device 12 is an amplifier for amplifying the input signal to the recording device 11.

Although not shown, the recording device 11 repeatedly moves its recording pen or discharge needle with a belt at a constant speed proportional to the underwater propagation velocity of the acoustic signal transmitted from the wave transmitter 8. configured to be moved.

Of course, this moving direction is perpendicular to the running direction of the recording paper.

The recording device 11 also includes a control contact (not shown) that generates a signal each time the recording pen returns to its movement reference point. It acts as a trigger signal for synchronously operating the device 7 and the control pulse generating circuit 10.

The operation of the time width changing device according to the present invention having the above configuration is as follows.

That is, if the measurement cycles of the acoustic sounding instrument are T□, T2, . . . shown in FIG. T2.・・・
・It is moved from the movement base point each time.

Therefore, from the control contact, the trigger shown in FIG.
Pulse P1. P2. ... are sequentially output, and this pulse activates the transmitter 7, causing the transmitter 3 to send out the acoustic signal shown in the figure into the water.

The acoustic signal transmitted from the transmitter 8 is reflected by an object such as the seabed 13, and the reflected wave is received by the receiver 9 and then amplified and detected by the receiver 10.

C in the figure shows the output signal of this receiver 10.

The output signal of the receiver 10 is input to the sampling circuit 1 of the device according to the present invention through the terminal Tin.

As described above, the sampling circuit 1 receives the sampling pulse from the control pulse generation circuit 10 as the trigger pulse P□.

P2. . . , a signal shown in the figure d, which is a sampled signal C, appears from the output terminal of the sampling circuit 1.

The amplitude value of the sampled signal d is converted into a digital value by the A/D converter 2, and then sent to the first storage circuit 3 and the second storage circuit 4.

The first and second memory circuits 3 and 4 alternately perform write and read operations using write and read pulses respectively applied from the control pulse generation circuit 10 as described above.

Therefore, for the first storage circuit 3, the first period T1,
First period T1. . . . (odd number cycles), the write pulse shown in FIG.
. . . (even cycles), the second storage circuit 4 is given the read pulses shown in FIG. The write pulse shown in FIG.
If the control pulse generation circuit 6 is operated to give the readout pulses shown in the figure in the third period T3... (odd number period), the circumferential shape "," will be obtained.

T3. ..., the signal value outputted from the A/D converter 2 is written into the first storage circuit 3, and the frequency M'r
2. T1. ... are read out respectively.

On the other hand, period T2. The output signal value of the converter 2 at To... is written into the second storage circuit 4, and the stored value is stored in the period T3. T5. ... are read out respectively.

Then, the values read from each memory circuit 3, 4 are
After being converted into an analog amplitude value again by the D converter 5, it is sent to the output terminal Tout.

Therefore, the frequency f1 of the sampling pulse and the write pulse outputted from the control pulse generation circuit 6, and the frequency f2 of the read pulse are respectively set to f1=1/L/
N f2 = Kei V/L'/N Matadashi, ■ = Underwater propagation speed of acoustic signal L': Sounding distance where the signal can be displayed on the recording paper determined by the width of the recording paper and the moving speed of the pen or discharge needle mentioned above. L: When set to the desired display sounding distance on the recording paper, the signal input to the terminal Tin is multiplied by f1/f2=L'/L and output from the terminal Tout.

As a result, for example, if a recording device with a full scale of 100 m is to be rubbed by a full scale of 10 m, it is sufficient to set f, L' = 2L 100 = 10, that is, the ratio of frequencies f□ and f2 to 10:1; Recording device 1 without changing pen speed
This means expanding the recording range of No. 1 by a factor of W.

Furthermore, when the recording range of the recording device 11 is doubled as shown in FIG. 2i, the frequency f of the sampling pulse and the write pulse shown in FIG. The frequency f2 of the readout pulse may be determined to be 1/2 of the frequency f2 as shown in h. Conversely, when the recording range is reduced by 172 times, the image frequency f1. What is necessary is to determine f2.

As described above, according to the device of the present invention, the frequency f1.
By changing the ratio of f2, the recording range of the recording device can be changed arbitrarily without changing the mechanical speed of the device.

It goes without saying that the device according to the present invention can also be applied to devices that handle analog signals other than the acoustic sounding instrument described above.

Furthermore, the amplitude value of the signal output from the front output terminal Tout corresponds to the amplitude value of the signal input to the terminal Tin (of course it is also possible to set both to the same value), so the above Numerical analysis of the input signal can also be performed from the output signal.

Furthermore, by carefully examining the circuit configuration and elements of each component, it is possible to increase the speed of signal processing and expand the allowable pass frequency bandwidth, thereby further increasing applicability to other devices.

As described above, the analog signal time width changing device according to the present invention can arbitrarily change the time width of the input analog signal, so it can be used in conjunction with, for example, a pen or discharge needle type analog recording device. As a result, the recording range of the recording apparatus can be changed arbitrarily without changing the mechanical feed speed of the recording apparatus, thereby expanding the applicable range of the recording apparatus and improving recording accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart for explaining the operation of the device of the present invention. 1...Sampling circuit, 2...A/
D converter, 3...First storage circuit, 4...
・Second memory circuit, 5...D/A converter, 6...
... Control pulse generation circuit, 7 ... Transmitter,
8... Transmitter, 9... Receiver, 10.
... Receiver, 11 ... Recording device, 12.
......Amplifier.

Claims (1)

[Scope of utility model registration request] a sampling circuit that samples an analog input signal synchronized with a predetermined synchronization signal at a pulse frequency f1; an A/D converter that converts the analog signal sampled by the sampling circuit into a digital signal; a first memory circuit and a second memory circuit whose outputs are alternately written at a pulse frequency f in synchronization with the synchronization signal and read out alternately at a pulse frequency f2;
A sampling pulse and a conversion start pulse are sent to the D/A converter that converts the digital signal read from the storage circuit into an analog signal, the sampling circuit, and the A/D converter at a pulse frequency f1, respectively, and the synchronization is performed. Odd period of signal T1. At T3..., a write pulse at a pulse frequency f1 is sent to the first storage circuit, and a read pulse at a pulse frequency f2 is sent to the second storage circuit, and the even cycle of the synchronization signal T2. T, . . . , a control pulse generating circuit that sends a read pulse at a pulse frequency f2 to the first storage circuit and a write pulse at a pulse frequency f1 to the second storage circuit, and 1. An analog signal time width changing device, characterized in that the ratio to f1 can be changed.