| Patent No. | Patent Title: |
| 5414766 | Process and device for adaptive digital cancellation of the echo ... |
| 5406622 | Outbound noise cancellation for telephonic handset |
| 5404399 | Telephone visual signaling device |
| 5396550 | Radio and land-line telephones with hands-free operation |
| 5396553 | Automatic loss control circuit |
| 5396554 | Multi-channel echo canceling method and apparatus |
| 5394465 | Parallel phone detection circuit |
| 5394392 | Method for transferring information using modems |
| 5392348 | DTMF detection having sample rate decimation and adaptive tone de... |
| 5390250 | Echo canceller with improved doubletalk detection |
| 5384839 | Trunk apparatus for loop dialing trunk line |
| 5384842 | Programmable telephone |
| 5381473 | Noise cancellation apparatus |
| 5369690 | Telephone call detecting circuit and a method of remotely accessi... |
| 5367569 | Network interface modules |
| 5363441 | Technique for reducing echoes in conference communications |
| 5353347 | Telephone headset amplifier with battery saver, receive line nois... |
| 5353346 | Multi-frequency signal detector and classifier |
| 5353348 | Double echo cancelling system |
| 5347577 | Battery feed circuit for supplying feed current to telephone set |
| 5343518 | System and method for controlling the dialing order of call recor... |
| 5343521 | Device for processing echo, particularly acoustic echo in a telep... |
| 5341418 | ISDN terminal adapter for access from analog signal equipment of ... |
| 5337355 | Supply circuit device for a user's telephone circuit, having a lo... |
| 5337356 | Ringing circuit for use in portable telephone set |
| 5335271 | Ring trip detection circuit |
| 5333196 | Current limiting battery feed arrangement |
| 5329506 | Information retrieving system |
| 5329587 | Low-delay subband adaptive filter |
| 5329580 | Communication terminal adaptor |
| 5327495 | Apparatus and method for controlling an echo canceler |
| 5323461 | Telephone line interface circuit with voltage switching |
| 5323460 | Enhanced subscriber line interface circuit |
| 5317634 | Telephone subset arrangement |
| 5315653 | Current limited subscriber interface circuit |
| 5311573 | Facsimile apparatus |
| 5307407 | 20 Hz ring generator using high frequency PWM control |
| 5307406 | ISDN power source detection circuit |
| 5307405 | Network echo canceller |
| 5305379 | Semiconductor integrated device |
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