Sound signal automatic detection and display method and system
US4457203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1982 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Mar 9, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10G7/02
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A sound signal automatic detector used in a system with a micro computer and display for automatically detecting an input sound wave, computing from the detected sound wave the fundamental frequency of the sound and displaying its value in a number of different formats. The sound signal detector requires no attention on the part of a musician or other user while it is in operation and comprises a sound signal transducer supplying an amplifier having audio frequency bandpass characteristics compatible with the sound signal frequency spectrum over which sound signals to be analyzed extend. The bandpass characteristics of the amplifier preferably are defined by a high pass filter stage followed by an automatic gain control amplifier that in turn is followed by two stages of low pass filtering. The low pass filter stages supply their output to an alternate positive peak voltage and negative peak voltage detector circuit that functions to derive an output signal which is representative of the fundamental frequency of a input sound wave being analyzed. The output from the automatic detection circuit is supplied to a micro computer which then processes the signal and derives a number of d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.