| Patent No. | Patent Title: |
| 4004097 | Automatic meter reading device |
| 3992584 | Automatic microphone mixer |
| 3991272 | Audio AGC amplifier |
| 3985968 | Multiplex data communications using acoustical surface wave filte... |
| 3984641 | System for switching and safeguarding data in time-division multi... |
| 3980828 | Reverberation system with extended frequency response |
| 3979557 | Speech processor system for pitch period extraction using predict... |
| 3978287 | Real time analysis of voiced sounds |
| 3978286 | Artificial larynx |
| 3978293 | Ringing control circuitry with shared ringing loop current detect... |
| 3978292 | Ringing control circuitry with shared ringing loop current detect... |
| 3976844 | Data communication system for transmitting data in compressed for... |
| 3974334 | Waveform processing |
| 3973081 | Feedback residue compression for digital speech systems |
| 3971895 | Ringing control circuitry with shared ringing loop current detect... |
| 3970791 | Voice controlled disappearing audio delay line |
| 3970785 | Tone count audiometric computer |
| 3970797 | Digital conference bridge |
| 3970786 | Loudspeaking telephone with improved receive sensitivity |
| 3969585 | Frequency-division multiplexer for telephone transmission providi... |
| 3965295 | Protective system for stereo loudspeakers |
| 3959597 | Delay line time compressor and expander |
| 3958084 | Conferencing apparatus |
| 3956589 | Data telecommunication system |
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