D2Audio Corporation
38Patents
27Active
38Granted
49Portfolio score
Filing activity: Mar 19, 2004 → Aug 25, 2011 · 24 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7649410B2 | Systems and methods for improving performance in a digital amplifier by adding an ultrasonic signal to an input audio signal | Electricity | 110 | Active |
| US7167112B2 | Systems and methods for implementing a sample rate converter using hardware and software to maximize speed and flexibility | Electricity | 91 | Expired |
| US7078963B1 | Integrated PULSHI mode with shutdown | Electricity | 52 | Expired |
| US7286009B2 | Digital PWM amplifier with simulation-based feedback | Electricity | 47 | Expired |
| US7023268B1 | Systems and methods for automatically adjusting channel timing | Electricity | 38 | Expired |
| US7061312B2 | Systems and methods for providing multi channel pulse width modulated audio with staggered outputs | Electricity | 35 | Expired |
| US7576606B2 | Digital PWM amplifier having a low delay corrector | Electricity | 12 | Active |
| US7259618B2 | Systems and methods for load detection and correction in a digital amplifier | Electricity | 11 | Expired |
| US7286010B2 | Systems and methods for over-current protection | Electricity | 11 | Expired |
| US7929718B1 | Systems and methods for switching and mixing signals in a multi-channel amplifier | Electricity | 10 | Active |
| US7728658B2 | Low-noise, low-distortion digital PWM amplifier | Electricity | 10 | Active |
| US7362254B2 | Systems and methods for minimizing delay in a control path | Electricity | 9 | Active |
| US7738613B1 | Streaming multi-channel audio as packetized data or parallel data with a separate input frame sync | Electricity | 8 | Active |
| US7482865B2 | Systems and methods for correcting errors resulting from component mismatch in a feedback path | Electricity | 8 | Active |
| US7474722B1 | Systems and methods for sample rate conversion using multiple rate estimate counters | Electricity | 7 | Active |
| US7812666B2 | Low delay corrector | Electricity | 6 | Active |
| US7706545B2 | Systems and methods for protection of audio amplifier circuits | Electricity | 6 | Active |
| US7518444B2 | PWM feedback/feed-forward protection | Electricity | 5 | Active |
| US7590251B2 | Clip detection in PWM amplifier | Electricity | 5 | Expired |
| US7791427B2 | Systems and methods to minimize startup transients in class D amplifiers | Electricity | 4 | Active |
| US7425853B2 | Systems and methods for pulse width modulating asymmetric signal levels | Electricity | 3 | Active |
| USRE43461E1 | Systems and methods for load detection and correction in a digital amplifier | General | 3 | Active |
| USRE44525E1 | Systems and methods for over-current protection | General | 2 | Active |
| US8115564B2 | Systems and methods to minimize startup transients in class-D amplifiers | Electricity | 2 | Active |
| US7436255B2 | Power supply feed forward analog input filter component mismatch correction | Electricity | 2 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.