JP2538617Y2 - Digital storage oscilloscope - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital storage oscilloscope with a video signal output.

[0002]

2. Description of the Related Art Conventional digital storage oscilloscopes
The output format of the stored waveform is a display on the screen of the oscilloscope itself, a plotter output, and a GP-I
There are types such as B output and data bus output.

[0003]

There is no conventional digital storage oscilloscope which has a video signal output to be output to a television receiver or the like. For this reason, there has been a problem that the image cannot be output to a video printer, a TV monitor, a VTR, or the like. SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital storage oscilloscope which has the above-mentioned problems by providing a video signal output circuit.

[0004]

SUMMARY OF THE INVENTION A digital storage oscilloscope according to the present invention comprises a clock pulse oscillator, and a synchronizing signal generator for generating a horizontal synchronizing signal and a vertical synchronizing signal upon receiving an oscillating clock pulse from the clock pulse oscillator. A first saw-tooth wave signal generating circuit for receiving a horizontal sync signal output from the sync signal generator and generating a saw-tooth wave signal for designating all horizontal addresses of the storage memory in one cycle; A second sawtooth wave signal generating circuit for receiving a vertical synchronizing signal output from the signal generator and generating a sawtooth wave signal for designating all addresses in the vertical direction of the storage memory in one cycle, and a first sawtooth signal A first A / D converter for converting a sawtooth wave signal output from the wave signal generation circuit into digital data and designating a horizontal address of a storage memory; Digital de output sawtooth signal from the wave signal generator - is converted into data stress - a first 2A / D converter that specifies the vertical address of Jimemori,
The output read out by specifying the read address by the conversion digital data by the first and second A / D converters is used as a luminance signal, which is output together with the horizontal synchronizing signal and the vertical synchronizing signal.

[0005]

In the digital storage oscilloscope of the present invention having the above-described structure, a horizontal synchronizing signal and a vertical synchronizing signal are generated by a synchronizing signal generator in response to an oscillation clock pulse from a clock pulse oscillator. Upon receiving the horizontal synchronizing signal, a saw-tooth wave signal for designating all addresses in the horizontal direction of the storage memory is output from the first saw-tooth wave signal generation circuit in one cycle, and the first A / D converter outputs the digital data.
The converted digital data specifies the horizontal address of the storage memory. Further, in response to the vertical synchronizing signal, a saw-tooth wave signal for designating all addresses in the vertical direction of the storage memory is output from the second saw-tooth wave signal generation circuit in one cycle, and is digitally converted by the second A / D converter. The vertical direction address of the storage memory is designated by the converted digital data. First and second
The data stored in the storage memory read from the address specified by the digital data converted by the A / D converter corresponds to the luminance signal, and the data read from the storage memory. The video signal is synthesized with the data and the synchronization signal.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. Reference numeral 1 denotes a storage memory for storing an input waveform in a digital storage oscilloscope.
A waveform associated with data stored in the memory 1 is displayed on the CRT screen of the digital storage oscilloscope. The waveform data Z for recording is supplied to the storage memory 1. On the other hand, an A / D converter 2 for supplying a vertical signal Y of the digital storage sill scope to a contact a of the switching circuit S1 and converting the signal into a vertical address of the storage memory 1 via the switching circuit S1. , And the digital data converted by the A / D converter 2 designates the vertical address of the storage memory 1.
The horizontal signal X of the digital storage sill scope is supplied to the contact "a" of the switching circuit S3 and is selected by the A / D converter 3 for conversion to the horizontal address of the storage memory 1 via the switching circuit S3. A / D converter 3
The vertical address of the storage memory 1 is designated by the digital data converted by the above. Clock pulse CL
K is supplied to the contact a of the switching circuit S2, and is selectively supplied as a clock pulse to the A / D converter 2 and the A / D converter 3 via the switching circuit S2.

On the other hand, the oscillation clock pulse of the clock pulse oscillator 4 is supplied to the contact b of the switching circuit S2,
The clock signal is supplied to a synchronizing signal generator 5 for generating a horizontal synchronizing signal and a vertical synchronizing signal, and selectively supplied as clock pulses to the A / D converter 2 and the A / D converter 3 via a switching circuit S2; The synchronization signal generator 5 generates a horizontal synchronization signal and a vertical synchronization signal. The horizontal synchronizing signal generated by the synchronizing signal generator 5 is supplied to a saw-tooth wave signal generating circuit 7 for generating a saw-tooth wave signal for designating all horizontal addresses of the storage memory in one cycle. The vertical synchronizing signal generated by the generator 5 is supplied to a saw-tooth wave signal generating circuit 6 for generating a saw-tooth wave signal for designating all vertical addresses of the storage memory in one cycle.

The sawtooth signal generated by the sawtooth signal generator 6 is supplied to the contact b of the switching circuit S1 and selectively supplied to the A / D converter 2. The sawtooth signal generator 7 generates the sawtooth signal. The saw-tooth wave signal is supplied to the contact b of the switching circuit S3 and the A / D
It is selectively supplied to the converter 3. A / D converter 2 and A
The address is specified by the digital data converted by the / D converter 3, and when writing to the specified storage memory address, the waveform data Z is written, and the reading is performed from the specified storage memory address. At this time, the written data is read. The data read from the storage memory 1 is supplied as a luminance signal to a video signal generator 8 to which a horizontal synchronizing signal and a vertical synchronizing signal are supplied.

In the digital storage oscilloscope of this embodiment configured as described above, when data is written in the storage memory 1, the switching circuits S1, S2 and S3 are used.
Is switched to the contact a side, and the vertical signal Y of the digital storage oscilloscope is supplied to the A / D converter 2 and converted into digital data, and the converted digital data is stored in the storage memory 1. A vertical address is specified,
The horizontal signal X of the digital storage oscilloscope is supplied to an A / D converter 3 and converted into digital data. The converted digital data specifies a horizontal address of the storage memory 1. The waveform data is stored at this specified address.
Data Z is stored. This operation is performed until all the data corresponding to the CRT display is written.

Next, when reading data stored in the storage memory 1, the switching circuits S1, S2 and S3 are used.
Is switched to the contact b side. The clock pulse oscillator 4 oscillates at a frequency capable of generating a clock pulse corresponding to the horizontal resolution of the storage memory 1 during one cycle of the horizontal synchronizing signal. Upon receiving a clock pulse from the clock pulse oscillator 4, the synchronization signal generator 5 generates a vertical synchronization signal and a horizontal synchronization signal. The vertical synchronizing signal is supplied to the saw-tooth signal generating circuit 6, and the saw-tooth signal generating circuit 6 receiving the vertical synchronizing signal generates a saw-tooth signal in synchronization with the vertical synchronizing signal.
The amplitude of the saw-tooth wave signal output from the saw-tooth wave signal generation circuit 6 is set to an amplitude that allows all vertical addresses of the storage memory 1 to be specified by the conversion output data of the A / D converter 2. .

Similarly, the horizontal synchronizing signal generated from the synchronizing signal generator 5 is supplied to a sawtooth signal generating circuit 7, and the sawtooth signal generating circuit 7 receiving the horizontal synchronizing signal synchronizes with the horizontal synchronizing signal. Generate a sawtooth signal. The amplitude of the saw-tooth wave signal output from the saw-tooth wave signal generation circuit 7 is set to an amplitude that allows all horizontal addresses of the storage memory 1 to be specified by the conversion output data of the A / D converter 3. . The sawtooth signal output from the sawtooth signal generation circuit 7 is A
The data is supplied to the / D converter 3 and A / D converted. The converted digital data specifies the horizontal address of the storage memory 1. The sawtooth signal output from the sawtooth signal generation circuit 6 is supplied to the A / D converter 2 and A / D converted, and the converted digital data designates the vertical address of the storage memory 1. Is done.

The data stored in the storage memory 1 is read by designating the horizontal address, and when the reading of the data stored at the final address of the horizontal address is completed, the vertical address is incremented by one. The horizontal address is sequentially specified from address 0 to the last address, and the data stored in the storage memory 1 is sequentially read. Thereafter, the address is similarly specified, and the read operation is performed. The data read by the address designation is data written before the reading, and the read data is a luminance signal. The luminance signal and the horizontal synchronizing signal generated by the synchronizing signal generator 5 are used. The signal and the vertical synchronizing signal are added by the video signal synthesizer 8. A video signal is generated and output by this addition.

Further, in the above embodiment, the case where the storage memory 1 is directly addressed by the digital data converted by the A / D converters 2 and 3 has been exemplified. To the memory of A /
The digital data converted by the D converters 2 and 3 may be used to address the other memory. Further, the luminance signal, the horizontal synchronization signal, and the vertical synchronization signal may be separately output.

[0014]

As described above, according to the present invention, a horizontal synchronizing signal and a vertical synchronizing signal are generated by a synchronizing signal generator in response to an oscillating clock pulse from a clock pulse oscillator, and are output from the synchronizing signal generator. A sawtooth wave signal synchronized with the horizontal synchronizing signal is generated, the horizontal address of the storage memory is designated by the A / D converted digital data, and the sawtooth synchronized with the vertical synchronizing signal output from the synchronizing signal generator. The configuration is such that a waveform signal is generated, and the A / D-converted digital data is used to perform vertical addressing of the storage memory to read the data stored in the storage memory. The data corresponds to the luminance signal, the video signal can be synthesized with the luminance signal and the synchronizing signal, and the video signal is output from the digital storage oscilloscope. It is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage memory 2 and 3 A / D converter 4 Clock pulse oscillator 5 Synchronous signal generator 6 and 7 Sawtooth signal generator 8 Video signal generator

Claims (1)

(57) [Scope of request for utility model registration] 1. A clock pulse oscillator, a synchronization signal generator for receiving an oscillation clock pulse from the clock pulse oscillator to generate a horizontal synchronization signal and a vertical synchronization signal, and receiving a horizontal synchronization signal output from the synchronization signal generator A first saw-tooth wave signal generating circuit for generating a saw-tooth wave signal for designating all horizontal addresses of the storage memory in one cycle, and one cycle in response to a vertical synchronizing signal output from a synchronizing signal generator. A second sawtooth wave signal generating circuit for generating a sawtooth wave signal for designating all the vertical addresses of the storage memory, and a digital sawtooth wave signal output from the first sawtooth wave signal generating circuit. A first A / D converter for converting the data into data and specifying a horizontal address of the storage memory;
A second A / D converter for converting a sawtooth signal output from the second sawtooth signal generation circuit into digital data and designating a vertical address of the storage memory; and a first and second A / D converter. A digital storage oscilloscope wherein an output read out by specifying a read address by conversion digital data by a D converter is output as a luminance signal and output together with a horizontal synchronizing signal and a vertical synchronizing signal.