TIME COMPRESSION SIGNAL PROCESSOR

• US 3,774,201 A
• Filed: 12/17/1970
• Issued: 11/20/1973
• Est. Priority Date: 12/17/1970
• Status: Expired due to Term

• Current Assignee: John D. Collins
• Original Assignee: John D. Collins
• Inventors: Collins, John D.
• Primary Examiner(s): Hubler, Malcolm F.
• Application Number:
  US05/099,294
• Time in Patent Office: 1,069 Days
• Field of Search: 343/5DP,17.2PC,8,9
• US Class Current: 324/76.24
• CPC Class Codes: G01S 13/64 Velocity measuring systems using range gates

Abstract

A time compression system used for spectrum analysis of multichannel digital systems in which there are X identical input channels and Y identical filters. Each input is sampled in parallel and then quantized with an analog-to-digital converter. The inputs are then stored channel by channel in a random access memory. Readout is interleaved simultaneously with the writing and each channel is readout serially. The stored digital signals are converted back to serial analog signals and fed to a single bank of filters for spectrum analysis.

Claims

1. In combination:

means for sequentially sampling input signals from each of a plurality of channels;

means for storing digital data signals derived from said signal samples in a storing sequence and for reading said data from said storing means in a reading sequence;

said storing sequence being different from said reading sequence; and

said data being read during time periods between the time period during which each sample is taken from each of said channels.

2. The combination in accordance with claim 1 wherein analog signals reconstructed from said data signals read out of said storing means are fed to a filter bank.

3. The combination in accordance with claim 2 wherein said filter bank comprises a plurality of frequency responsive filters responsive to respectively different frequency bands.

4. The combination in accordance with claim 1 wherein said signal samples are converted to digital data signals at a predetermined rate.

5. The combination in accordance with claim 4 wherein digital signals read out from said storing means are fed to a digital-to-analog converter to convert said digital signals to analog signals.

6. The combination in accordance with claim 5 wherein said analog signals are fed to a multichannel filter.

7. The combination in accordance with claim 6 wherein said multichannel filter comprises a plurality of frequency responsive filters.

8. The combination in accordance with claim 7 wherein the outputs of said frequency responsive filters are fed to a switching network.

9. The combination in accordance with claim 8 wherein the outputs of said frequency responsive filters are fed through said switching network to a common channel.