Methods of and system for receiving transmitting oscilloscope signals

• US 4,739,253 A
• Filed: 07/09/1986
• Issued: 04/19/1988
• Est. Priority Date: 03/07/1985
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Original Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Inventors: Everhart, Robert W., Huck, Charles T.
• Primary Examiner(s): Karlsen, Ernest F.
• Assistant Examiner(s): Nguyen, Vinh P.
• Application Number:
  US06/883,587
• Time in Patent Office: 650 Days
• Field of Search: 324/111, 324/112, 324/102, 324/121 R, 324/77 B, 364/487, 364/521, 179/2 A, 340/870.21, 340/347 SH, 340/722, 340/728, 340/720, 379/93, 379/96
• US Class Current: 324/121.00R
• CPC Class Codes: G01R 13/345 for displaying sampled signals by using digital processors by intermediate A.D. and D.A. convertors (control circuits for CRT indicators)

Abstract

A system for transmitting traces of an oscilloscope (16) to a remote locan. A transmitter circuit (18) digitizes and transmits the traces to the remote location. A receiver circuit (24) at the remote location receives the transmitted signals and delivers these signals to a destination oscilloscope (26). At the transmitting location, the vertical output signal of the oscilloscope is amplified and fed to an analog-to-digital converter. The digitized output signal of the converter and the oscilloscope'"'"'s timebase gate signal are stored in a memory circuit and subsequently transmitted to the remote location via a first modem (20). At the remote location, the receiver circuit (24) comprises a universal asynchronous receiver transmitter (UART) interfacing with a second modem (22), a memory circuit for storing the transmitted signals, and associated circuitry for restoring the oscilloscope signal'"'"'s amplitude. The timebase gate signal of the transmitting oscilloscope (16) is used to trigger the destination oscilloscope (FIG. 1).

Claims

1. A system for receiving oscilloscope signals comprising:

means for storing incoming digital signals serially transmitted from a remote location as words each identifying both vertical channel and time base gate component signals;

means for converting the digital signal words stored in the storing means into analog vertical channel and time base gate component signals; and

means for displaying an oscilloscope signal in response to the analog vertical channel and time base gate component signals.

2. The systems as recited in claim 1 wherein the system further comprises means for generating a plurality of clock pulses;

and wherein the storing means comprises;

means, responsive to the clock pulses, for addressing specific storage locations within the storing means;

means responsive to the clock pulses for developing a write enable signal to enable the storing means to store the digital signal words;

means, responsive to the absence of the write enable signal, for terminating the storage of the digital signal words in the storing means; and

means, responsive to the clock pulses for writing to and reading from the storing means.

3. The system as recited in claim 1 wherein the incoming digital signals have a first amplitude level and wherein the storing means includes means for changing the level of the incoming digital signals to a second amplitude level.

4. A method of receiving oscilloscope signals comprising the steps of:

storing incoming digital signals serially transmitted from a remote location in a memory circuit as words each identifying both vertical channel and time base gate component signals;

converting the digital signal words stored in the memory circuit into analog vertical channel and time base gate component signals; and

displaying an oscilloscope signal in response to the analog vertical channel and time base gate component signals.

5. The method as recited in claim 4 further comprises the step of generating a plurality of clock pulses;

and wherein the storing step comprises;

addressing, in response to the clock pulses, specific storage locations within the memory circuit;

developing a write enable signal in response to the plurality of clock pulses to enable the storing of the digital signal words;

terminating the storage of the digital signal words in response to the absence of the write enable signal; and

writing to and reading form the memory circuit in response to the plurality of clock pulses.

6. The method as recited in claim 5 wherein the incoming digital signals have a first amplitude level and wherein the step of storing includes the step of changing the level of the incoming digital signals to a second amplitude level.

7. An oscilloscope signal receiver comprising:

means for receiving serial digital signals and storing said received digital signals as words each identifying both vertical channel and time base gate component signals,

means for converting said stored digital signal words into analog vertical channel and time base gate component signals and displaying said analog vertical channel and time base gate component signals as an oscilloscope signal, and

means for recycling said receiving and storing means to enable said converting and displaying means to continuously display said oscilloscope signal.

8. The oscilloscope signal receiver set forth in claim 7 wherein said receiving and storing means comprises

a receiver and register for receiving said serial digital signals and registering ones of said serial digital signals as parallel bit words.

9. The oscilloscope signal receiver set forth in claim 8 wherein said receiving and storing means comprises

a memory coupled with said receiver and register for storing said registered parallel bit words.

10. The oscilloscope signal receiver set forth in claim 9 wherein said converting and displaying means comprises

a converter coupled with said memory for converting one of said bits of each stored word into the time base gate component signal and predetermiend others of stored word bits into the analog vertical channel signal.

11. The oscilloscope signal receiver set forth in claim 10 wherein said recycling means comprises

means for continuously cycling said memory to read each stored word from said memory into said converter to convert said bits of each stored work into said analog vertical channel and time base gate component signals and continuously displaying said analog vertical channel and time base gate component signals as said oscilloscope signal.

12. A method of reeiving oscilloscope signal scomprising the steps of:

receiving serial digital signals and storing said received digital signals as words each identifying both vertical channel and time base gate component signals,

converting said stored digital signal words into analog vertical channel and time base gate component signals and displaying said analog vertical channel and time base gate component signals as an oscilloscope signal, and

cycling said stored digital signal words and converting said cycled stored digital signal words into analog vertical channel and time base gate component signals and displaying said analog vertical channel and time base gate component signals as a continuous oscilloscope signal.

13. The method of receiving oscilloscope signals set forth in claim 12 wherein said receiving and storing step comprises the steps of:

receiving said digital signals in a serial format, and

registering ones of said received serial digital signals as parallel bit words.

14. the method of receiving oscilloscope signals set forth in claim 13 wherein said receiving and storing step comprises the step of

storing each of said registered parallel bit words.

15. The method of receiving oscilloscope signals set forth in claim 14 wherein said converting and displaying step comprises the steps of:

converting one of each stored word bits into a time base gate component signal, and

converting predetermined others of stored word bits into an analog vertical channel signal.

16. The method of receiving oscilloscope signals set forth in claim 15 wherein said cycling and displaying step comprises the steps of

continuously cycling said stored words and converting each cycled stored word bits into said analog vertical channel and time base gate component signals and continuously displaying said analog vertical channel and time base gate component signals as said oscilloscope signal.