US 5,371,787 A · Machine answer detection

Abstract

A detector to indicate if a telephone call was answered by an answering machine or a live person includes (to analyze frames): a click detector; a ring detector; a voice detector; an energy detector; and a controller. The controller routes to: a voice analyzer if voice occurred; a ring analyzer if ring started, continues, or ended; a noise detector if there is neither ring nor voice; a click analyzer if a click occurred; an answer analyzer if ring did not start in the frame; and a silence analyzer. The noise detector detects noise; the ring analyzer detects start time, end time, and length of ring; the click analyzer detects click time; the answer analyzer detects call answer time; the silence analyzer detects silence and the time of predetermined lengths of silence; and the voice analyzer detects the first frame of voice and routes to an on-first voice analyzer or to an after-first voice analyzer. Lastly, the on-first voice analyzer determines if the call was answered by an answering machine and routes to a reporter and the after-first voice analyzer determines if the telephone call was answered by an answering machine or a live person and routes to the reporter.

Claims15

Dependent claims

An answering machine detector for determining whether a telephone call has been answered by an answering machine or by a live person, the answering machine detector comprising:

means for detecting a first measure of a length of time between the time the telephone call is answered and the time of first voice response;
and
means for generating a signal indicating that the telephone call was answered by the answering machine if the first measure of a length of time is greater than a predetermined time-to-answer length.

An answering machine detector for determining whether a telephone call has been answered by an answering machine or by a live person, the answering machine detector comprising:

a click detector means, responsive to a telephone signal generated during a telephone call, for detecting a click in a predetermined period of time referred to as a frame and for storing a click indication thereof in a storage means;
a ring detector means, responsive to the telephone signal, for detecting whether a ring event started, continues, or ended in the frame and for storing a ring indication thereof in the storage means;
a voice detector means, responsive to the telephone signal, for detecting whether a voice event occurred in the frame and for storing a voice indication thereof in the storage means;
an energy detector means, responsive to the telephone signal, for:
(a) determining a measure of the total energy of the telephone signal in the frame and a measure of energy concentration of the signal referred to as broad;
(b) storing the measures in the storage means;
and (c) transmitting a signal to a controller means;
wherein the controller means is apparatus, responsive to the signal from the energy detector means, for:
(a) obtaining the voice indication from the storage means and, if a voice event occurred, transmitting a signal to a voice analyzer means;
(b) obtaining the ring indication from the storage means and, if a ring event started, continues, or ended in the frame, transmitting a signal to a ring analyzer means;
(c) if the frame is not inside a ring event or a voice event, transmitting a signal to a noise detector means;
(d) obtaining the click indication from the storage means and, if a click occurred in the frame, transmitting a signal to a click analyzer means;
(e) if the ring indication does not indicate that a ring event started in the frame, transmitting a signal to an answer analyzer means;
and (f) transmitting a signal to a silence analyzer means;
wherein:
the noise detector means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting whether the telephone signal during the frame is noise and, if so, for storing noise information in the storage means;
the ring analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for storing an indication of the length of a ring event in the storage means;
the click analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for storing an indication of the time a click was detected in the storage means;
the answer analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting an indication of the time at which the telephone call is answered and for storing the indication of the time in the storage means;
the silence analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting silence, for determining an indication of the time at which a predetermined time length of silence occurred, and for storing the indication of the time in the storage means;
and
the voice analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for determining whether the frame is the first frame in which a voice event has occurred and, if so, for transmitting a signal to an on-first voice analyzer means and, if not, for transmitting a signal to an after-first voice analyzer means;
wherein:
the on-first voice analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting whether the telephone call was answered by an answering machine and, if so, for transmitting a signal to a reporter means;
and
the after-first voice analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for determining whether the telephone call was answered by an answering machine or a live person and for transmitting a signal indicative thereof to the reporter means;
wherein the reporter means comprises means, responsive to signals from the on-first voice analyzer means and the after-first voice analyzer means, for generating a signal indicating whether the telephone call was answered by an answering machine or by a live person.

24 more elements

A method for determining whether a telephone call has been answered by an answering machine or by a live person, the method comprising the steps of:

responsive to a telephone signal generated during a telephone call:
(a) detecting a click in a predetermined period of time referred to as a frame and storing a click indication thereof;
(b) detecting whether a ring event started, continues, or ended in the frame and storing a ring indication thereof;
(c) detecting whether a voice event occurred in the frame and storing a voice indication thereof;
(d) (i) determining a measure of the total energy of the telephone signal in the frame and a measure of energy concentration of the signal referred to as broad and (ii) storing the measures;
responsive to the end of a frame:
(a) obtaining the voice indication and, if a voice event occurred, transferring to a voice analyzing step;
(b) obtaining the ring indication and, if a ring event started, continues, or ended in the frame, transferring to a ring analyzing step;
(c) if the frame is not inside a ring event or a voice event, transferring to a noise detecting step;
(d) obtaining the click indication from the storage means and, if a click occurred in the frame, transferring to a click analyzing step;
(e) if the ring indication does not indicate that a ring event started in the frame, transferring to an answer analyzing step;
and (f) transferring to a silence analyzing step;
wherein:
the noise detecting step comprises the steps of, responsive to stored information, detecting whether the telephone signal during the frame is noise and, if so, storing noise information;
the ring analyzing step comprises the steps of, responsive to stored information, storing an indication of the length of a ring event;
the click analyzing step comprises the steps of, responsive to stored information, storing an indication of the time a click was detected;
the answer analyzing step comprises the steps of, responsive to stored information, detecting an indication of the time at which the telephone call is answered and storing the indication of the time;
the silence analyzing step comprises the steps of, responsive to stored information, detecting silence, determining an indication of the time at which a predetermined time length of silence occurred, and storing the indication of the time;
and
the voice analyzing step comprises the steps of, responsive to stored information, determining whether the frame is the first frame in which a voice event has occurred and, if so, transferring to an on-first voice analyzing step and, if not, transferring to an after-first voice analyzing step;
wherein:
the on-first voice analyzing step comprises the steps of, responsive to stored information, detecting whether the telephone call was answered by an answering machine and, if so, for transferring an indication thereof to a reporting step;
and
the after-first voice analyzing step comprises the steps of, responsive to stored information, determining whether the telephone call was answered by an answering machine or a live person and for transferring an indication thereof to the reporting step;
wherein the reporting step comprises the steps of, responsive to indications from the on-first voice analyzing step and the after-first voice analyzing step, generating a signal indicating whether the telephone call has been answered by an answering machine or by a live person.

22 more elements

An answering machine detector for determining whether a telephone call has been answered by an answering machine or by a live person, the answering machine detector comprising:

a ring detector means, responsive to the telephone signal, for detecting whether a ring event started, continues, or ended in a predetermined period of time referred to as a frame and for storing a ring indication thereof in the storage means;
a voice detector means, responsive to the telephone signal, for detecting whether a voice event occurred in the frame and for storing a voice indication thereof in the storage means;
an energy detector means, responsive to the telephone signal, for:
(a) determining a measure of the total energy of the telephone signal in the frame and a measure of energy concentration of the signal referred to as broad;
(b) storing the measures in the storage means;
and (c) transmitting a signal to a controller means;
wherein the controller means is apparatus, responsive to the signal from the energy detector means, for:
(a) obtaining the voice indication from the storage means and, if a voice event occurred, transmitting a signal to a voice analyzer means;
(b) obtaining the ring indication from the storage means and, if a ring event started, continues, or ended in the frame, transmitting a signal to a ring analyzer means;
(c) if the frame is not inside a ring event or a voice event, transmitting a signal to a noise detector means;
(d) if the ring indication does not indicate that a ring event started in the frame, transmitting a signal to an answer analyzer means;
and (e) transmitting a signal to a silence analyzer means;
wherein:
the noise detector means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting whether the telephone signal during the frame is noise and, if so, for storing noise information in the storage means;
the ring analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for storing an indication of the length of a ring event in the storage means;
the answer analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting an indication of the time at which the telephone call is answered and for storing the indication of the time in the storage means;
the silence analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting silence, for determining an indication of the time at which a predetermined time length of silence occurred, and for storing the indication of the time in the storage means;
and
the voice analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for determining whether the frame is the first frame in which a voice event has occurred and, if so, for transmitting a signal to an on-first voice analyzer means and, if not, for transmitting a signal to an after-first voice analyzer means;
wherein:
the on-first voice analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for detecting whether the telephone call was answered by an answering machine and, if so, for transmitting a signal to a reporter means;
and
the after-first voice analyzer means comprises means, responsive to the signal from the controller means and information obtained from the storage means, for determining whether the telephone call was answered by an answering machine or a live person and for transmitting a signal indicative thereof to the reporter means;
wherein the reporter means comprises means, responsive to signals from the on-first voice analyzer means and the after-first voice analyzer means, for generating a signal indicating whether the telephone call was answered by an answering machine or by a live person.

21 more elements

Dependencies are inferred from the claim text.

Machine answer detection

Life of this patent

Machine answer detection

Life of this patent

Abstract

Claims15