US4648110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for a voice-controlled hands-free telephone facility
Assignee: Alcatel Lucent NV
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Filing: 1985-03-22
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Granted: 1987-03-03
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Expires: 2005-03-22
Abstract
Abstract A voice-controlled hands-free facility contains a microphone, an internal and an external loudspeaker, and two series combinations of an input amplifier (EV), a variable attenuator (DR), and an output amplifier (AV), one for the send path and one for the receive path, and is controlled by a voice control unit (SS) connected to the output (E) of the input amplifier (EV), to the output (D) of the variable attenuator (DR), and, by a line (L), to an input of the variable attenuator (DR). To permit the hands-free facility to be switched from a single-part mode of operation to a two-part mode, the output (E) of the input amplifier (EV) in the send path and/or the receive path is connected to the output (A) of the output amplifiers (AV) through a bypass device (BP) and a switching unit (T).
Inventors
- 👤 Martin Elsasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:47
CPC Classifications
H; H04; H04M; H04M9/00; H04M9/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
Circuit arrangement for a voice-controlled hands-free facility, connected via a hybrid circuit to a subscriber facility, comprising a microphone, an internal and an external loudspeaker, and two series combinations of an input amplifier (EV), a variable attenuator (DR), and an output amplifier (AV), one series combination for each of two transmission paths of said subscriber facility, with an output (E) of each of said input amplifiers (EV) and an output (D) of each of said variable attenuators (DR) connected to a voice control unit (SS) coupled to provide control signals to each of said variable attenuators (DR) (L), characterized in that in at least one of said two transmission paths, said output (E) of said input amplifier (EV) is connected to an output (A) of said output amplifier (AV) through a bypass device (BP) and a switching unit (T).
Claim 2
Dependent Claim
139 words
Circuit arrangement for a voice-controlled hands-free facility, connected via a hybrid circuit to a subscriber facility, comprising a microphone, an internal and an external loudspeaker, and two series combinations of an input amplifier (EV), a variable attenuator (DR), and an output amplifier (AV), one series combination for each of two transmission paths of said subscriber facility, with an output (E) of each of said input amplifiers (EV) and an output (D) of each of said variable attenuators (DR) connected to a voice control unit (SS) coupled to provide control signals to each of said variable attenuators (DR) (L), characterized in that in at least one of said two transmission paths, said output (E) of said input amplifier (EV) is connected to an output (A) of said output amplifier (AV) through a bypass device (BP) and a switching unit (T).
Claim 3
Dependent Claim
47 words
A circuit arrangement as claimed in claim 1, characterized in that, in said at least one of said two transmission paths, in response to the turning on of the internal loudspeaker, said switching unit (T) disconnects said bypass device (BP) from said output of said output amplifier.
Claim 4
Dependent Claim
53 words
A circuit arrangement as claimed in claim 1, characterized in that in said at least one of said two transmission paths, said bypass device (BP) consists of a resistor in series with a capacitor, so that said bypass device attenuates a signal output (E) from said input amplifier (EV) by a presettable value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |