Apparatus for interfacing analog telephone in ISDN terminal adapter
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United States of America Patent
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Oct 17, 1995
Issued Date -
N/A
app pub date -
Nov 14, 1994
filing date -
Dec 28, 1990
priority date (Note) -
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Abstract
An apparatus for interfacing an analog telephone in an ISDN terminal adapter is able to independently perform call set-up regardless of a personal computer's operation, while being provided with ISDN audio service via an existing analog telephone. The apparatus includes a combocodec for converting a digital audio signal from the co-processor into an analog audio signal to supply it to a telephone, and for digitizing an analog audio signal from the telephone to supply it to the co-processor; a ring generator for generating a ring signal under the control of the co-processor; and a DC-voltage converter for generating a telephone driving voltage. A subscriber line interfacing circuit (SLIC) is connected to a telephone, a DC-voltage converter, and a combocodec, for supplying the telephone driving voltage to the telephone, interfacing the audio signals between the telephone and combocodec, and sensing the office line to determine the telephone's hook state. A relay is connected among the SLIC, ring generator, and the telephone, for supplying the ring signal from the ring generator to the telephone under the control of the SLIC. A tone decoder is provided for decoding a dual tone multi-frequency signal from among the audio signals from the SLIC to the combocodec, and transmitting the decoded signal to the co-processor.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- SAMSUNG ELECTRONICS CO., LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kim, Ho-jun | Seoul, KR | 29 | 122 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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