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Inventor: Cheng; Chao-Jan
Address: Belleville, CA
No. of patents: 1
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 4528664 |
Call progress signal monitor and method for telephone systems |
July 9, 1985 |
| A call progress signal monitor includes a translation circuit for generating data signals indicative of predetermined signal characteristics in a TDM PCM signal channel. A processor implemented detection circuit is responsive to the data signals for detecting call progress tones and |
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