Location History:
- Bismarckstrasse, DE (2005 - 2008)
- Kirchheim, DE (2008)
Company Filing History:
Years Active: 2005-2008
Title: Innovations by Klaus Graef
Introduction
Klaus Graef is a notable inventor based in Bismarckstrasse, Germany. He has made significant contributions to the field of audio technology, holding three patents that showcase his innovative spirit and technical expertise.
Latest Patents
One of his latest patents is for a circuit enabling audio superpositioning. This invention allows for the superpositioning of different audio signals, such as voice, music, or ringer signals, in an audio output device. The design utilizes a combination of resistors and switches, eliminating the need for an additional mixing amplifier, which is common in prior art. The circuit reduces power consumption, minimizes the required chip area, and improves the power supply rejection rate (PSSR).
Another significant patent is for a circuit that combines audio and ringing modes. This invention utilizes the same amplifiers and volume adjustment circuitry for both the ringer and audio modes of a mobile phone. The volume adjustment is achieved through a precise amplitude setting via the gain control stages of an inverting voltage amplifier. This design avoids high power dissipation and the risks associated with high slew rates, ensuring a more efficient operation.
Career Highlights
Klaus Graef is currently employed at Dialog Semiconductor GmbH, where he continues to innovate in the field of audio technology. His work has had a substantial impact on the design and functionality of audio devices, particularly in mobile technology.
Collaborations
Klaus collaborates with Edgar Sexauer, contributing to the development of advanced audio solutions. Their partnership has fostered a creative environment that encourages innovation and technical advancement.
Conclusion
Klaus Graef's contributions to audio technology through his patents reflect his dedication to innovation and excellence. His work continues to influence the industry, paving the way for more efficient audio solutions.