Nobutaka Amada
52Patents
16h-index
57Co-inventors
87Inventor score
Filing activity: Feb 11, 1977 → Oct 27, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5912969A | Information receiving and recording/reproducing apparatus/method having function for limiting/delimiting for protecting copyright of recording information | Electricity | 61 | Expired |
| US4541091A | Code error detection and correction method and apparatus | Electricity | 47 | Expired |
| US5719943A | Digital information signal transmitting/receiving method and system | Electricity | 43 | Expired |
| US4409559A | Supply voltage controlled stereophonic amplifier system | Electricity | 36 | Expired |
| US6292618A | Image recording and reproducing apparatus | Electricity | 36 | Expired |
| US5699370A | Information recording and reproduction apparatus to be controlled by temporal information | Electricity | 30 | Expired |
| US4642573A | Phase locked loop circuit for demodulating suppressed carrier signals | Electricity | 26 | Expired |
| US5706385A | Rotary head type magnetic recording and reproducing apparatus | Electricity | 24 | Expired |
| US5260671A | Receiving circuit for demodulating an angle modulated signal | Electricity | 23 | Expired |
| US4758903A | Apparatus for recording and reproducing video signal and digital signal other than video signal | Electricity | 18 | Expired |
| US5878188A | Apparatus for recording and reproducing temporally compressed digital information signal | Electricity | 18 | Expired |
| US6363210B1 | Communication system for encrypted data and apparatus for selectively recording and reproducing received analog signal and received digital signal | Electricity | 18 | Expired |
| US5875279A | Subscriber terminal of an interactive communication system and control device thereof | Electricity | 18 | Expired |
| US5825969A | Information management apparatus for inhibiting reproduction in a video cassette recorder | Electricity | 18 | Expired |
| US5414567A | Magnetic recording and reproducing device | Electricity | 17 | Expired |
| US5903704A | Apparatus for selectively recording and reproducing received analog and digital signals | Electricity | 17 | Expired |
| US5465180A | Method of and apparatus for recording and/or reproducing a current digital video signal and a high-definition digital video signal in a common track format | Electricity | 16 | Expired |
| US4937686A | Method and apparatus for PCM recording and reproducing an audio signal having an asynchronous relation between the sampling frequency for the audio signal and the rotation frequency of a rotary head scanner | Physics | 15 | Expired |
| US4427951A | Protective device for power amplifier | Electricity | 13 | Expired |
| US5341248A | Magnetic recording/reproducing apparatus having head structure for selectively recording/reproducing either of two kinds of signals containing different amounts of information | Electricity | 12 | Expired |
| US6339676B1 | Video signal recording and reproducing apparatus compatible with analog and digital video signal recording and reproducing | Electricity | 10 | Expired |
| US6104862A | Video signal recording and reproducing apparatus compatible with analog and digital video signal recording and reproducing | Electricity | 9 | Expired |
| US4068187A | Audio-frequency power amplifiers | Electricity | 6 | Expired |
| US6249639A | Digital information recording-reproducing apparatus | Electricity | 6 | Expired |
| US6204985A | Information management apparatus | Electricity | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.