Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5126990 | Method of evaluating a storage medium by recirculating a test sample of a signal | Edward Efron, James O. McPherson | 1992-06-30 |
| 5001568 | Signal evaluation by accumulation at one rate and releasing and testing at a slower rate | Edward Efron, James O. McPherson | 1991-03-19 |
| 4764915 | Method and apparatus for recording a multiplexed signal on a record medium | Edward Efron, James O. McPherson | 1988-08-16 |
| 4755884 | Audio evaluation of information stored on a record medium under control of video picture frame number | Edward Efron, James O. McPherson | 1988-07-05 |
| 4746991 | Recording characteristic evaluation of a recording medium with a time sequence of test signals | Edward Efron, James O. McPherson | 1988-05-24 |
| 4682246 | Characterizing the information transfer characteristics of a recording medium | Edward Efron, James O. McPherson | 1987-07-21 |
| 4623837 | Audio/video quality monitoring system | Edward Efron, James O. McPherson | 1986-11-18 |
| 4598324 | Audio evaluation under control of video picture frame number | Edward Efron, James O. McPherson | 1986-07-01 |
| 4524444 | Analyzing the signal transfer characteristics of a signal processing unit | Edward Efron, James O. McPherson | 1985-06-18 |
| 4455634 | Audio/video quality monitoring system | Edward Efron, James O. McPherson | 1984-06-19 |