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US 7,548,616 B1Granted
Termination device for a telephone line
AssigneeInfineon Technologies AG
InventorsEliyahu Ponte, Yossef Reuven
Life of this patent
Estimating the term…
Abstract
A termination device for a telephone line of a wire based telephone system, said termination device (30) comprising: a high pass filter (39) for separating signals within a frequency band used by a high-speed modem (13) for data transmission; and impedance means (53) connected to the high-pass filter (39), wherein said impedance means (53) has an impedance which matches the impedance of the telephone line in the frequency band used by the high-speed modem (13).
Claims34
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter having a variable cut-off frequency, wherein the termination device includes first and second line-side terminals for connecting to a telephone line, wherein the high-pass filter is connected across the first and second line-side terminals, and wherein the impedance is connected across the high-pass filter.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter having a variable cut-off frequency, wherein the impedance value of said impedance is asymptotically resistive, wherein the impedance includes a resistor, and wherein the impedance value of the resistor is 130 Ohms.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter having a variable cut-off frequency, wherein the low-pass filter is configured to separate a telephone voice signal transmitted within a low frequency band, and wherein the cut-off frequency of the low-pass filter is about 700 kHz.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter having a variable cut-off frequency, wherein the low-pass filter is configured to separate a telephone voice signal transmitted within a low frequency band, and wherein the frequency band includes an ISDN-frequency band ranging from 9 Hz to 130 kHz.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter including an ISDN-frequency band ranging from approximately 9 Hz to approximately 130 kHz, wherein the termination device includes first and second line-side terminals for connecting to a telephone line, wherein the high-pass filter is connected across the first and second line-side terminals, and wherein the impedance is connected across the high-pass filter.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a first frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the first frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter for separating signals within a second frequency band, wherein a cut-off frequency of the low-pass filter and a cut-off frequency of the high-pass filter are adjustable, wherein the termination device includes first and second line-side terminals for connecting to a telephone line, wherein the high-pass filter is connected across the first and second line-side terminals, and wherein the impedance is connected across the high-pass filter.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter having a variable cut-off frequency, wherein the termination device includes device-side terminals and line-side terminals, wherein the low-pass filter includes a plurality of inductors connected in series between the device-side terminals and the line-side terminals and inductors and capacitors connected across the device-side terminals and the line-side terminals, and wherein the high-pass filter includes a plurality of capacitors and an inductor connected across the device-side terminals and the line-side terminals.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter including an ISDN-frequency band ranging from approximately 9 Hz to approximately 130 kHz, wherein the termination device includes device-side terminals and line-side terminals, wherein the low-pass filter includes a plurality of inductors connected in series between the device-side terminals and the line-side terminals and inductors and capacitors connected across the device-side terminals and the line-side terminals, and wherein the high-pass filter includes a plurality of capacitors and an inductor connected across the device-side terminals and the line-side terminals.
1 more element
A termination device for a telephone line of a wire based telephone system, said termination device comprising:
- a high-pass filter for separating signals within a first frequency band used by a high-speed modem for data transmission;
- an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the first frequency band used by the high-speed modem for data transmission;
- and
- a low-pass filter for separating signals within a second frequency band, wherein a cut-off frequency of the low-pass filter and a cut-off frequency of the high-pass filter are adjustable, wherein the termination device includes device-side terminals and line-side terminals, wherein the low-pass filter includes a plurality of inductors connected in series between the device-side terminals and the line-side terminals and inductors and capacitors connected across the device-side terminals and the line-side terminals, and wherein the high-pass filter includes a plurality of capacitors and an inductor connected across the device-side terminals and the line-side terminals.
1 more element
Dependencies are inferred from the claim text.