Waveform sequence trigger system

• US 4,797,936 A
• Filed: 11/16/1987
• Issued: 01/10/1989
• Est. Priority Date: 10/15/1984
• Status: Expired due to Fees

• Current Assignee: Anritsu Corporation
• Original Assignee: Anritsu Corporation
• Inventors: Hiratsuka, Shoji, Sekiya, Hitoshi, Katayama, Aiichi, Nakatsugawa, Kenji
• Primary Examiner(s): Boudreau, Leo H.
• Assistant Examiner(s): Couso, Jose L.
• Application Number:
  US07/120,729
• Time in Patent Office: 421 Days
• Field of Search: 324/73 R, 324/77 R, 324/78 R, 340/146.2, 358/166, 364/481, 364/487, 364/579, 364/580, 382/1, 382/33, 382/3 A, 382/42, 382/50, 382/54, 382/18, 382/51
• US Class Current: 324/76.12
• 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 digital signal processing apparatus has: an A/D converter for A/D converting an input signal to be processed to a digital signal, an analog comparator for comparing the input signal with a predetermined threshold voltage and generating a comparison signal as a binary signal, a first input device for inputting at least binary data of a reference wave to be triggered, a discriminator for discriminating a coincidence between the binary signal from the analog comparator and the binary data entered at the first input device and generating a coincidence signal, a fetching section, triggered in response to the coincidence signal from the discriminator, for fetching the digital signal from the A/D converter, and a processor for performing predetermined processing of the digital signal fetched by the fetching device.

Claims

1. A waveform sequence trigger system comprising:

comparing means for comparing an analog waveform input signal received with a predetermined threshold voltage to produce a serial analog signal having a high or low level;

sampling means, connected to said comparing means, for sampling said serial analog signal with a predetermined clock to produce a serial digital signal;

converting means, having serial shift registers of a predetermined bit number connected to said sampling means, for storing a predetermined bit portion of said serial digital signal while shifting it for each bit in accordance with a predetermined clock, and for converting data of a predetermined bit portion stored in said serial shift registers to a parallel digital signal;

reference data setting means connected to said converting means, for presetting reference data corresponding to a waveform sequence of a desired time interval, to be triggered, of said analog waveform input signal received by the comparing means;

first determining means, connected to said converting means and said reference data setting means, for determining a coincidence between said parallel digital signal and said reference data, and for counting a coincidence bit number as a result of a determination to thereby generate data representing said coincidence bit number;

weight setting means for presetting a predetermined weighting coefficient associated with said coincidence bit number; and

second determining means, connected to said first determining means and said weight setting means, for comparing said data representing said coincidence bit number with said predetermined weighting coefficient, and for generating a waveform sequence triggering signal when said coincidence bit number is equal to, or greater than, said predetermined weighting coefficient.

2. The waveform sequence trigger system according to claim 1, in which said converting means is comprised of a plurality of cascade-connected serial shift registers.

3. The waveform sequence trigger system according to claim 2, in which said first and second determining means each include a plurality of determining blocks corresponding to said plurality of cascade-connected serial shift registers, and

said second determining means includes means for taking a logical product corresponding to a result of a determination relative to the respective determining blocks and for outputting said waveform sequence triggering signal.

4. The waveform sequence trigger system according to claim 1, in which said reference data contains a don'"'"'t care signal.

5. An apparatus utilizing a waveform sequence triggering, comprising:

analog/digital converting means for converting a received analog waveform input signal to a digital signal;

comparing means for comparing said received analog waveform input signal with a predetermined threshold voltage to produce a serial analog signal having a high and a low level;

sampling means, connected to said comparing means, for sampling said serial analog signal with a predetermined clock to produce a serial digital signal;

converting means, having serial shift register of a predetermined bit number connected to said sampling means, for storing a predetermined bit portion of said serial digital signal while shifting it for each bit in accordance with a predetermined clock, and for converting data of a predetermined bit portion stored in said serial shift registers to a parallel digital signal;

reference data setting means connected to said converting means, for presetting reference data corresponding to a waveform sequence of a desired time interval, to be triggered, of said received analog waveform input signal;

first determining means, connected to said converting means and said reference data setting means, for determining a coincidence between said parallel digital signal and said reference data, and for counting a coincidence bit number as a result of a determination to thereby generate data representing said coincidence bit number;

weight setting means for presetting a predetermined weighting coefficient associated with said coincidence bit number;

second determining means, connected to said first determining means and said weight setting means, for comparing said data representing said coincidence bit number with said predetermined weighting coefficient, and for generating a waveform sequence triggering signal when said coincidence bit number is equal to, or greater than, said predetermined weighting coefficient; and

memory means, connected to said analog/digital converting means and said second determining means, for storing said digital signal in accordance with said waveform sequence triggering signal.

6. The apparatus according to claim 5, further comprising processing means, connected to said memory means, for reading said digital signal from said memory means, and for subjecting it to a predetermined processing.

7. The apparatus according to claim 6, further comprising display means, connected to said processing means, for displaying an output signal from said processing means.

8. The apparatus according to claim 5, in which said converting means is comprised of a plurality of cascade-connected shift registers.

9. The apparatus according to claim 8, in which said first and second determining means each include a plurality of determining blocks to said corresponding plurality of cascade-connected shift register, and

said second determining means includes means for taking a logical product corresponding to a result of a determination relative to the respective determining blocks, and for outputting said waveform sequence triggering signal.

10. The apparatus according to claim 5, in which said reference data contains a don'"'"'t care signal.