Average Co-Inventor Count = 2.00
ph-index = 3
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Yamaha Corporation (3 from 5,452 patents)
3 patents:
1. 5895449 - Singing sound-synthesizing apparatus and method
2. 5744741 - Digital signal processing device for sound signal processing
3. 5298675 - Electronic musical instrument with programmable synthesizing function