CA1283475C - Ultrasonic display assembly - Google Patents
Ultrasonic display assemblyInfo
- Publication number
- CA1283475C CA1283475C CA000525809A CA525809A CA1283475C CA 1283475 C CA1283475 C CA 1283475C CA 000525809 A CA000525809 A CA 000525809A CA 525809 A CA525809 A CA 525809A CA 1283475 C CA1283475 C CA 1283475C
- Authority
- CA
- Canada
- Prior art keywords
- modulator
- ultrasonic
- vector
- control circuit
- vector generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A display assembly for use with ultrasonic diagnostic equipment includes a modulator for receiving reflected pulses generated by an ultrasonic transducer, a cathode ray or television monitor for providing a visual ultrasonic display, a vector generator connected to a central processing unit and to the modulator, so that vector signals generated by the vector generator are modulated by the ultrasonic pulses in the modulator to provide signals to the monitor for creating an accurate ultrasonic image.
The use of vector signals is substantially quicker than the point-by-point digital signals presently in use.
A display assembly for use with ultrasonic diagnostic equipment includes a modulator for receiving reflected pulses generated by an ultrasonic transducer, a cathode ray or television monitor for providing a visual ultrasonic display, a vector generator connected to a central processing unit and to the modulator, so that vector signals generated by the vector generator are modulated by the ultrasonic pulses in the modulator to provide signals to the monitor for creating an accurate ultrasonic image.
The use of vector signals is substantially quicker than the point-by-point digital signals presently in use.
Description
~83475 This invention relates to a fast display assembly, and in particular to a display assembly for use in ultrasonic diagnostic equipment.
Conventional ultrasonic diagnostic equipment introduces an ultrasonic pulse into a body or object, and a series of echos or reflected pulses are picked up by a receiver. The pulses are reflected by interfaces of media of different acoustical properties.
The time required to receive reflected pulses and the amplitudes of the reflected pulses are characteristic of the quality and the distance of the reflecting surface from the ultrasonic transducer.
The different amplitudes are converted into luminous spots of different intensities, and the differences in the rates of return of the pulses are converted into distance measurements to yield a cross-sectional image on a screen, with continuous scanning.
There are presently available two different systems for displaying the image. One system employs an analogue image storage tube for storing the individual ultrasonic pulses. The image storage tube doe~ not provide an ultrasonic image. It is necessary to feed signals from the storage tube to a display screen. This method is expensive and cumbersome.
Another form of apparatus is described in British Patent No. 1,549,377, which issued to K.C.C. Fabrin et al on August 1, 1979. The patented device includes an ultrasonic probe which is passed over the body being examined. The reflected pulses are received by four sensors for locating points on a 1'~8347S
reflected surface. An analogue display is produced on a screen.
Another apparatus currently in use digitizes the individual pulses, and stores the pulses in a display memory.
The display memory is continuously read to provide an image on a screen. A drawback of this method is the necessity to calculate the position of each image point one at a time which is effected using a microcomputer. Because a microcomputer has a finite speed, the computer can perform the computation at a predetermined, finite speed only. Thus, the method can be somewhat slow, with only slowly varying images displayed on the screen.
The object of the present invention is to retain the advantages of digital display systems while eliminating the problems inherent in such systems by making it possible to display rapidly varying sectional images.
Accordingly, the present invention relates to a display assembly for use with ultrasonic diagnostic equipment comprising modulator means for receiving pulses generated by an ultrasonic transducer; monitor means for providing a visual ultrasonic display;
vector generator means for connection to a central processing unit connected to said modulator means, whereby vector signals can be generated by said vector generator means for modulation by the ultrasonic pulses in said modulator means to provide signals to said monitor means for creating an accurate ultrasonic image.
The present invention is based on the realization that it is not necessary to define the location of each point along a straight line; rather, it is sufficient to use three values, namely the starting point, magnitude and direction which essentially defines a vector. The use of vectoral definition greatlv enhances the speed of image development as compared to point-by-point definition of the image. The use of vectors is made possible by the availability of large scale integration circuits, which are capable of displaying vectors of different magnitudes and directions on a screen. The circuits or vector generators can be used directly as peripherals to a computer. A vector generator will plot vectors composed of as many as hundreds of points at a high rate using a minimum number of values, namely the three mentioned above. An important feature of the invention is the use of clock signal generators. The duration of a clock signal is sufficient for the display of an image dot. The time period in question is less than a microsecond. In contrast, tenths of microseconds are required for displaying an image dot under microcomputer control.
The vector generator requires three values, namely the coordinates of the starting point, the length of the vector and the direction of the vector. After these values have been entered, the vector generator will plot a continuous line on a screen.
The reflected ultrasonic pulses can be thought of as vectors, each having a starting point, direction and magnitude. The magnitude is represented by the echo time, the direction by the radiation angle of the ultrasonic transducer, and the starting point by the position on the plane of the radiating surface of 12~33475 the ultrasonic transducer. In order to obtain a sectional image from a set of vectors, the vectors displayed on the screen must be modulated in accordance with the reflected ultrasonic pulses in such a manner that the ultrasonic pulses reflected with different amplitudes are displayed as luminous dots of different intensities on the screen.
The invention is described hereinafter in greater detail with reference to the accompanying drawings which illustrate a preferred embodiment of the invention, and wherein:
Figure 1 is a schematic graph of images developed using the assembly of the present invention;
Figure 2 is a plot of reflected ultrasonic pulses indicative of the distances from a transducer to a reflecting surface;
Figure 3 is a schematic front view of a cathode ray tube or television screen with an ultrasonic image in accordance with the present invention; and Figure 4 is a block diagram of the circuit used in the assembly of the present invention.
With reference to Figure 1, contour lines 1 and 2 of different body tissues are generated using an ultrasonic transducer 3, which contacts a body 4 at a point V0. The ultrasonic pulses penetrate the body along a line represented by the longitudinal axis of the transducer 3, and pass through various body tissues before being absorbed. The depth of penetration of the ultrasonic lX~3475 pulses is given as distance Vl. The points at which the ultrasonic pulses reach the interfaces of different body tissues are represented by points El, E2, E3 and E4. Such points produce reflected pulses El, E2, E3 and E4 (Fig. 2) which are fed through line 6 (Figs. 1 and 4)to the assembly of the present invention.
The reflected ultrasonic pulses are ultimately displayed on a monitor 7 defined by a cathode ray tube or television screen (Fig. 3). In the display of Fig. 3, the broken lines represent the interfaces of body tissues or components, and the dots represent the reflected ultrasonic pulses. The meanings of the symbols V0, Vl~ El, E2, E3 and E4 are the same as in Fig. 1.
It is readily apparent that radiated ultrasound can be thought of as vector, with V0 being the starting point, the distance V0 - Vl being the length of the vector and the direction of the vector being the longitudinal axis of the ultrasonic transducer 3.
Referring to Fig. 4, the monitor 7 is connected to the output of a mixer 9, which is connected to a digital to analogue converter 10 and a display memory 11. The mixer 9 is connected to the SYNC outlet of a vector generator 13 by a line 14, and the display memory 11 is connected to the DAD output of the vector generator 13 by a line 16. The display memory 11 is also connected to the RW outlet of the vector generator 13 by a line 17. The vector generator 13 may be an IC (integrated circuit) Type EF 9365 or EF 9366. The display memory 11 is defined by dynamic RAM circuits, and the mixer 9 is merely lX~3~75 a transistor. The digital to analogue converter 10 is defined by logic gate circuits and resistors.
The vector generator 13 is connected by address lines 18 and data lines 19 to a main computer or central processing unit (not shown). The data lines 19 are also connected to a peripheral interface adapter circuit 20 (an INTEL*8255 IC). The vector generator 13 and the adapter circuit 20 are connected to a modulator 22.
The modulator 22 includes an analogue to digital converter 23 for receiving reflected pulses from the transducer 3 and converting the pulses to digital form. The reflected pulses are fed from the converter 23 to a gate circuit 24, outlet Q of which is connected to inlet DIN of the display memory 11 by a line 25.
The gate circuit 24 is defined by tri-state buffer circuits. The I/O outlet of the gate circuit 24 is connected to a latch circuit 27 (a RAM or RAMs), which receives signals from a control circuit 28 via lines 29, 30 and 31. The control circuit 28 i5 defined by logic AND gates and counters. Line 29 also connects the control circuit 28 to the gate circuit 24. The vector generator 13 is connected to the control circuit 28 by lines 33, and the interface adapter circuit 20 is connected to the control circuit 28 by lines 34. A clock signal generator 35 is provided in a line 36 between the converter 23 and the control circuit 28, and a second clock signal generator 38 is provided in one of the lines 33 between the clock signal input CKo of the generator 13 * INTEL is a registered trade mark lZ~3475 and the control circuit 28.
The vector generator 13 willnormally display continuously and repeatedly the image content stored in the display memory 11 by addressing individually each register of the display memory 11 at address outputs DAD, number y. Each register of the display memory 11 is n bits long which means that the amplitudes of the reflected ultrasonic pulses are broken up into 2n fractions, and that the echos or reflected pulses are displayed on the screen of the monitor 7 in the form of 2n luminous dots of different intensities.
The digitized image points are reconverted into analogue signals by the digital to analogue converter 10, and the signals are passed to one input of the mixer circuit 9. The signals of the SYNC output of the vector generator 13 are passed to the other input of the mixer circuit 9. The signals from the vector generator 13 include the necessary video sync pulses. The two signals are mixed before being passed to the input of the monitor 7 via the output of the mixer circuit 9.
Normally, the output signal DIN of the vector generator 13 is available at outputs Q of the gate circuit 24. As mentioned above, the gate circuit 24 is defined by tri-state buffer circuits, so that various characters and symbols can be displayed on the screen of the monitor 7 using the built-in character generatox of the vector generator 13. The process is carried out until another vector is entered into the display 128~475 memory 11. As each ultrasonic pulse is received, input Eo of the control circuit 28 is activated through the data lines 19 and the adapter circuit 20. As a result of such activation, the third output of the control circuit 28 will enable the operation of clock signal generator 35, employing monostable multivibrators.
Moreover the circuit 10 drives the OD and RW inputs of the latch 27 and one input of the gate circuit 24 (through the first and second outputs of the control circuit 28)in such a manner that the digitized signal of the ultrasonic pulses appearing at the outputs of the converter 23, i.e. the reflected pulses will be written in the latch 27 via the gate circuit 24. The converter 23 will sample the reflected ultra~onic pulses appearing at the input thereof in step with the output signal of the clock signal generator 35.
Moreover, the control circuit 28 will address via address line 31, number x, the memory registers of the latch 27, which are set in step with the output signal of the clock signal generator 35. The latch 27 contains M memory registers of n bits each, where M is identical to the length of the vector (e.g. M = 256). As soon as the latch 27 i8 full, the control circuit 28 stops the clock signal generator 35 and resets the address outputs DAD. Moreover, the control circuit 28 will set the latch 27 to a readout mode through the first and second outputs. The data lines of the gate circuit 24 are set so that the data flows from the latch 27 to the display memory 11, while the output signal DIN of the vector generator 13 is available at outputs Q. This is the normal 1;~83475 condition existing until the input Eo of control circuit 28 is activated, or upon issuance of instructions to write the contents of the latch 27 in the display memory 11.
The last mentioned process occurs in the following manner. As the digitized signal of the reflected ultrasonic pulses is written into the latch 27, the coordinates of the end point of the ultrasonic transducer and the direction of the radiated ultrasonic pulses are defined. As a result, the starting point and direction of the vector to be displayed are known.
The magnitude of the vector is a known and constant value. After the latch 27 has been set, the input El of the control circuit 28 is activated. The control circuit 28 then receives the clock signal required for functioning from the output of the clock signal generator 38, but is not activated untilthe appearance of output signal RW of the vector generator 13. The data relating to the vector are written in the vector generator 13 via the data lines 19 and the address lines 18. After the data is answered, the vector generator 13 addresses the regiQters of the display memory 11 corresponding to the vector to be displayed. At the same time, the vector generator 13 provides the display memory 11 and the control circuit 28 with clock signals via output RW. During the clock signal of output RW, outputs DAD of control circuit 28 will address, one-by-one the registers of the latch 27 under the control of the clock signal CKo from the vector generator 13. The contents of the register are transcribed in the display 1~834'75 memory 11 through the I/O pins of the latch 27 and outputs Q of the gate circuit 24. After M registers of latch 27 have been read out, the circuit as a whole is reset to a normal condition and remains so until the next activation signal.
Thus, the vector modulated in proportion to the amplitudes of the reflected ultrasonic pulses will be written into the display memory 11. The images continue to be displayed over and over again. The sectional image can be produced by writing an adequate number of vectors in the display memory 11.
Conventional ultrasonic diagnostic equipment introduces an ultrasonic pulse into a body or object, and a series of echos or reflected pulses are picked up by a receiver. The pulses are reflected by interfaces of media of different acoustical properties.
The time required to receive reflected pulses and the amplitudes of the reflected pulses are characteristic of the quality and the distance of the reflecting surface from the ultrasonic transducer.
The different amplitudes are converted into luminous spots of different intensities, and the differences in the rates of return of the pulses are converted into distance measurements to yield a cross-sectional image on a screen, with continuous scanning.
There are presently available two different systems for displaying the image. One system employs an analogue image storage tube for storing the individual ultrasonic pulses. The image storage tube doe~ not provide an ultrasonic image. It is necessary to feed signals from the storage tube to a display screen. This method is expensive and cumbersome.
Another form of apparatus is described in British Patent No. 1,549,377, which issued to K.C.C. Fabrin et al on August 1, 1979. The patented device includes an ultrasonic probe which is passed over the body being examined. The reflected pulses are received by four sensors for locating points on a 1'~8347S
reflected surface. An analogue display is produced on a screen.
Another apparatus currently in use digitizes the individual pulses, and stores the pulses in a display memory.
The display memory is continuously read to provide an image on a screen. A drawback of this method is the necessity to calculate the position of each image point one at a time which is effected using a microcomputer. Because a microcomputer has a finite speed, the computer can perform the computation at a predetermined, finite speed only. Thus, the method can be somewhat slow, with only slowly varying images displayed on the screen.
The object of the present invention is to retain the advantages of digital display systems while eliminating the problems inherent in such systems by making it possible to display rapidly varying sectional images.
Accordingly, the present invention relates to a display assembly for use with ultrasonic diagnostic equipment comprising modulator means for receiving pulses generated by an ultrasonic transducer; monitor means for providing a visual ultrasonic display;
vector generator means for connection to a central processing unit connected to said modulator means, whereby vector signals can be generated by said vector generator means for modulation by the ultrasonic pulses in said modulator means to provide signals to said monitor means for creating an accurate ultrasonic image.
The present invention is based on the realization that it is not necessary to define the location of each point along a straight line; rather, it is sufficient to use three values, namely the starting point, magnitude and direction which essentially defines a vector. The use of vectoral definition greatlv enhances the speed of image development as compared to point-by-point definition of the image. The use of vectors is made possible by the availability of large scale integration circuits, which are capable of displaying vectors of different magnitudes and directions on a screen. The circuits or vector generators can be used directly as peripherals to a computer. A vector generator will plot vectors composed of as many as hundreds of points at a high rate using a minimum number of values, namely the three mentioned above. An important feature of the invention is the use of clock signal generators. The duration of a clock signal is sufficient for the display of an image dot. The time period in question is less than a microsecond. In contrast, tenths of microseconds are required for displaying an image dot under microcomputer control.
The vector generator requires three values, namely the coordinates of the starting point, the length of the vector and the direction of the vector. After these values have been entered, the vector generator will plot a continuous line on a screen.
The reflected ultrasonic pulses can be thought of as vectors, each having a starting point, direction and magnitude. The magnitude is represented by the echo time, the direction by the radiation angle of the ultrasonic transducer, and the starting point by the position on the plane of the radiating surface of 12~33475 the ultrasonic transducer. In order to obtain a sectional image from a set of vectors, the vectors displayed on the screen must be modulated in accordance with the reflected ultrasonic pulses in such a manner that the ultrasonic pulses reflected with different amplitudes are displayed as luminous dots of different intensities on the screen.
The invention is described hereinafter in greater detail with reference to the accompanying drawings which illustrate a preferred embodiment of the invention, and wherein:
Figure 1 is a schematic graph of images developed using the assembly of the present invention;
Figure 2 is a plot of reflected ultrasonic pulses indicative of the distances from a transducer to a reflecting surface;
Figure 3 is a schematic front view of a cathode ray tube or television screen with an ultrasonic image in accordance with the present invention; and Figure 4 is a block diagram of the circuit used in the assembly of the present invention.
With reference to Figure 1, contour lines 1 and 2 of different body tissues are generated using an ultrasonic transducer 3, which contacts a body 4 at a point V0. The ultrasonic pulses penetrate the body along a line represented by the longitudinal axis of the transducer 3, and pass through various body tissues before being absorbed. The depth of penetration of the ultrasonic lX~3475 pulses is given as distance Vl. The points at which the ultrasonic pulses reach the interfaces of different body tissues are represented by points El, E2, E3 and E4. Such points produce reflected pulses El, E2, E3 and E4 (Fig. 2) which are fed through line 6 (Figs. 1 and 4)to the assembly of the present invention.
The reflected ultrasonic pulses are ultimately displayed on a monitor 7 defined by a cathode ray tube or television screen (Fig. 3). In the display of Fig. 3, the broken lines represent the interfaces of body tissues or components, and the dots represent the reflected ultrasonic pulses. The meanings of the symbols V0, Vl~ El, E2, E3 and E4 are the same as in Fig. 1.
It is readily apparent that radiated ultrasound can be thought of as vector, with V0 being the starting point, the distance V0 - Vl being the length of the vector and the direction of the vector being the longitudinal axis of the ultrasonic transducer 3.
Referring to Fig. 4, the monitor 7 is connected to the output of a mixer 9, which is connected to a digital to analogue converter 10 and a display memory 11. The mixer 9 is connected to the SYNC outlet of a vector generator 13 by a line 14, and the display memory 11 is connected to the DAD output of the vector generator 13 by a line 16. The display memory 11 is also connected to the RW outlet of the vector generator 13 by a line 17. The vector generator 13 may be an IC (integrated circuit) Type EF 9365 or EF 9366. The display memory 11 is defined by dynamic RAM circuits, and the mixer 9 is merely lX~3~75 a transistor. The digital to analogue converter 10 is defined by logic gate circuits and resistors.
The vector generator 13 is connected by address lines 18 and data lines 19 to a main computer or central processing unit (not shown). The data lines 19 are also connected to a peripheral interface adapter circuit 20 (an INTEL*8255 IC). The vector generator 13 and the adapter circuit 20 are connected to a modulator 22.
The modulator 22 includes an analogue to digital converter 23 for receiving reflected pulses from the transducer 3 and converting the pulses to digital form. The reflected pulses are fed from the converter 23 to a gate circuit 24, outlet Q of which is connected to inlet DIN of the display memory 11 by a line 25.
The gate circuit 24 is defined by tri-state buffer circuits. The I/O outlet of the gate circuit 24 is connected to a latch circuit 27 (a RAM or RAMs), which receives signals from a control circuit 28 via lines 29, 30 and 31. The control circuit 28 i5 defined by logic AND gates and counters. Line 29 also connects the control circuit 28 to the gate circuit 24. The vector generator 13 is connected to the control circuit 28 by lines 33, and the interface adapter circuit 20 is connected to the control circuit 28 by lines 34. A clock signal generator 35 is provided in a line 36 between the converter 23 and the control circuit 28, and a second clock signal generator 38 is provided in one of the lines 33 between the clock signal input CKo of the generator 13 * INTEL is a registered trade mark lZ~3475 and the control circuit 28.
The vector generator 13 willnormally display continuously and repeatedly the image content stored in the display memory 11 by addressing individually each register of the display memory 11 at address outputs DAD, number y. Each register of the display memory 11 is n bits long which means that the amplitudes of the reflected ultrasonic pulses are broken up into 2n fractions, and that the echos or reflected pulses are displayed on the screen of the monitor 7 in the form of 2n luminous dots of different intensities.
The digitized image points are reconverted into analogue signals by the digital to analogue converter 10, and the signals are passed to one input of the mixer circuit 9. The signals of the SYNC output of the vector generator 13 are passed to the other input of the mixer circuit 9. The signals from the vector generator 13 include the necessary video sync pulses. The two signals are mixed before being passed to the input of the monitor 7 via the output of the mixer circuit 9.
Normally, the output signal DIN of the vector generator 13 is available at outputs Q of the gate circuit 24. As mentioned above, the gate circuit 24 is defined by tri-state buffer circuits, so that various characters and symbols can be displayed on the screen of the monitor 7 using the built-in character generatox of the vector generator 13. The process is carried out until another vector is entered into the display 128~475 memory 11. As each ultrasonic pulse is received, input Eo of the control circuit 28 is activated through the data lines 19 and the adapter circuit 20. As a result of such activation, the third output of the control circuit 28 will enable the operation of clock signal generator 35, employing monostable multivibrators.
Moreover the circuit 10 drives the OD and RW inputs of the latch 27 and one input of the gate circuit 24 (through the first and second outputs of the control circuit 28)in such a manner that the digitized signal of the ultrasonic pulses appearing at the outputs of the converter 23, i.e. the reflected pulses will be written in the latch 27 via the gate circuit 24. The converter 23 will sample the reflected ultra~onic pulses appearing at the input thereof in step with the output signal of the clock signal generator 35.
Moreover, the control circuit 28 will address via address line 31, number x, the memory registers of the latch 27, which are set in step with the output signal of the clock signal generator 35. The latch 27 contains M memory registers of n bits each, where M is identical to the length of the vector (e.g. M = 256). As soon as the latch 27 i8 full, the control circuit 28 stops the clock signal generator 35 and resets the address outputs DAD. Moreover, the control circuit 28 will set the latch 27 to a readout mode through the first and second outputs. The data lines of the gate circuit 24 are set so that the data flows from the latch 27 to the display memory 11, while the output signal DIN of the vector generator 13 is available at outputs Q. This is the normal 1;~83475 condition existing until the input Eo of control circuit 28 is activated, or upon issuance of instructions to write the contents of the latch 27 in the display memory 11.
The last mentioned process occurs in the following manner. As the digitized signal of the reflected ultrasonic pulses is written into the latch 27, the coordinates of the end point of the ultrasonic transducer and the direction of the radiated ultrasonic pulses are defined. As a result, the starting point and direction of the vector to be displayed are known.
The magnitude of the vector is a known and constant value. After the latch 27 has been set, the input El of the control circuit 28 is activated. The control circuit 28 then receives the clock signal required for functioning from the output of the clock signal generator 38, but is not activated untilthe appearance of output signal RW of the vector generator 13. The data relating to the vector are written in the vector generator 13 via the data lines 19 and the address lines 18. After the data is answered, the vector generator 13 addresses the regiQters of the display memory 11 corresponding to the vector to be displayed. At the same time, the vector generator 13 provides the display memory 11 and the control circuit 28 with clock signals via output RW. During the clock signal of output RW, outputs DAD of control circuit 28 will address, one-by-one the registers of the latch 27 under the control of the clock signal CKo from the vector generator 13. The contents of the register are transcribed in the display 1~834'75 memory 11 through the I/O pins of the latch 27 and outputs Q of the gate circuit 24. After M registers of latch 27 have been read out, the circuit as a whole is reset to a normal condition and remains so until the next activation signal.
Thus, the vector modulated in proportion to the amplitudes of the reflected ultrasonic pulses will be written into the display memory 11. The images continue to be displayed over and over again. The sectional image can be produced by writing an adequate number of vectors in the display memory 11.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A display assembly for use with ultrasonic diagnostic equipment comprising modulator means for receiving pulses generated by an ultrasonic transducer; monitor means for providing a visual ultrasonic display; vector generator means for connection to a central processing unit connected to said modulator means, whereby vector signals can be generated by said vector generator means for modulation by the ultrasonic pulses in said modulator means to provide signals to said monitor means for creating an accurate ultrasonic image.
2. An assembly according to claim 1 including display memory means connected to said modulator means and to said vector generator means; and mixer means for receiving signals from said vector generator means and said display memory means, and for feeding resultant signals to said monitor means.
3. An assembly according to claim 2, including first analogue to digital converter means in said modulator means for receiving the pulses from the transducer; gate circuit means connecting said first converter means to said display memory means;
and second digital to analogue converter means connecting said display memory means to said mixer means.
and second digital to analogue converter means connecting said display memory means to said mixer means.
4. An assembly according to claim 3, including control circuit means in said modulator means for receiving signals from said vector generator means and controlling said gate circuit means; and interface adapter means connected to data lines of the central processing unit and to said control circuit means.
5. An assembly according to claim 4, wherein said modulator means includes latch means connecting said control circuit means to said gate circuit means for storing digital signals received from said first converter means.
6. An assembly according to claim 4, including first clock signal generator means connecting said vector generator means to said control circuit means; and address lines connecting the central processing unit to said vector generator means.
7. An assembly according to claim 6, wherein said modulator means includes second clock signal generator means connected to said first converter means and to said control circuit means, whereby said first converter means provides one input to said control circuit means and said second clock signal generator means provides a second input thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000525809A CA1283475C (en) | 1986-12-18 | 1986-12-18 | Ultrasonic display assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000525809A CA1283475C (en) | 1986-12-18 | 1986-12-18 | Ultrasonic display assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1283475C true CA1283475C (en) | 1991-04-23 |
Family
ID=4134592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000525809A Expired - Lifetime CA1283475C (en) | 1986-12-18 | 1986-12-18 | Ultrasonic display assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1283475C (en) |
-
1986
- 1986-12-18 CA CA000525809A patent/CA1283475C/en not_active Expired - Lifetime
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| MKLA | Lapsed |