Inventor

HEYL LAWRENCE F

US20 patents

⚠️ This page may combine multiple inventors who share the name “HEYL LAWRENCE F”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HEYL LAWRENCE F

APPLE COMPUTER

Audio codec with digital level adjustment and flexible channel assignment

System and method for synchronized presentation of video and audio signals

Pulse width modulation speaker amplifier

Apparatus for reproducing sound with a reduced dynamic range

Time division multiplexed video recording and playback system

System for processing and recording digital color television signal onto analog video tape

Audio peripheral mixer circuit and method for noise reduction

Reduced complexity audio mixing apparatus

Method and apparatus for combining a multiple-bit digital audio signal with a single-bit digital audio signal

Methods and apparatus for connecting and conditioning audio signals

Methods and apparatus for microphone preamplification

Muting of computer sound system during power cycling

Reduced complexity audio mixing apparatus

Audio signal conversion using frequency band division

Direct digital synthesis of video signal recording waveforms from baseband digital signals provided by a computer interface for compatible recording onto analog video tape

System for inexpensive phase coherent subcarrier generation

JOHNSON TIMOTHY M

Differential mode noise cancellation with active real-time control for microphone-speaker combinations used in two way audio communications

Mode switching noise cancellation for microphone-speaker combinations used in two way audio communications

APPLE INC

Noise cancellation for microphone-speaker combinations using combined speaker amplifier and reference sensing

Mode switching noise cancellation for microphone-speaker combinations used in two way audio communications