Telephone signal classification and phone message delivery method and system

Claim 3

The method of claim 1 wherein said applying a heuristic rule step includes a step of determining the root mean square of the plurality of samples over the predetermined period.

Claim 4

The method of claim 1 wherein said step of measuring over a predetermined period comprises measuring over a period of 64 milliseconds.

Claim 5

The method of claim 3 wherein said step of measuring a plurality of samples comprises measuring 512 samples over the period of 64 milliseconds.

Claim 6

The method of claim 1 wherein said step of measuring a plurality of samples comprises measuring 512 samples.

Claim 7

The method of claim 5 wherein said step of determining the linear prediction coding coefficients of a selected group from the plurality of samples comprises determining the linear prediction coding coefficients of every fourth sample of the plurality of samples.

Claim 8

The method of claim 5 wherein said step of determining the linear prediction coding coefficients of a selected group from the plurality of samples comprises determining the linear prediction coding coefficients of every sample of the plurality of samples.

Claim 9

The method of claim 1 wherein said step of determining the linear prediction coding coefficients of a selected group from the plurality of samples comprises determining the linear prediction coding coefficients of 128 of the 512 measured samples.

Claim 10

The method of claim 1 wherein said reference variance comprises a first reference variance, and further comprising the step of comparing the variance to a second reference variance.

Claim 11

The method of claim 1 wherein said reference variance comprises a first reference variance, and further comprising the steps of: comparing the variance to a second reference variance; and comparing the variance to a third reference variance.

Claim 12

The method of claim 10 wherein each of said comparisons of the variance with a reference variance comprises comparing the variance with a first, second or third reference representing a ring signal reference.

Claim 13

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the duration of a ring signal is at least 0.9 seconds but not longer than 2.5 seconds.

Claim 14

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a frame under the heuristic rule that the root mean square of a ring signal remains relatively constant during the period of the frame.

Claim 15

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the duration of a click signal is at most 0.25 seconds.

Claim 16

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a frame under the heuristic rule that the root mean square of a voice signal varies significantly over a period of the frame.

Claim 17

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic comprises a step of measuring the zero crossing of said received signal during the predetermined period.

Claim 18

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a busy signal is approximately 500 milliseconds.

Claim 19

The method of claim 1 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a reorder signal is approximately 250 milliseconds.

Claim 22

The method of claim 19 wherein said step of measuring a plurality of samples comprises measuring 512 samples over the period of 64 milliseconds.

Claim 23

The method of claim 19 wherein said step of determining the linear prediction coding coefficients of a selected group from the plurality of samples comprises determining the linear prediction coding coefficients of every fourth sample of the plurality of samples.

Claim 24

The method of claim 19 wherein each of said comparisons of the variance with a reference variance comprises comparing the variance with a first, second or third reference representing a ring signal reference.

Claim 25

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the duration of a ring signal is at least 0.9 seconds but not longer than 2.5 seconds.

Claim 26

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a frame under the heuristic rule that the root mean square of a ring signal remains relatively constant during a period of the frame.

Claim 27

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the duration of a click signal is at most 0.25 seconds.

Claim 28

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises evaluating a frame under the heuristic rule that the root mean square of a voice signal varies significantly over a period of the frame.

Claim 29

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of said received signal comprises a step of measuring the zero crossing of said received signal during the predetermined period.

Claim 30

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of the signal comprises evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a busy signal is approximately 500 milliseconds.

Claim 31

The method of claim 19 wherein said step of applying a heuristic rule to a selected characteristic of the signal comprises evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a reorder signal is approximately 250 milliseconds.

Claim 34

The method of claim 30 wherein said reference variance comprises a first reference variance, and further comprising the steps of: comparing the variance to a second reference variance; and comparing the variance to a third reference variance.

Claim 35

The method of claim 30 wherein said step of applying heuristic rules to selected characteristics of said received signal comprises: evaluating a duration of multiple frames under the heuristic rule that the duration of a ring signal is at least 0.9 seconds but not longer than 2.5 seconds; and evaluating a frame under the heuristic rule that the root mean square of a ring signal remains relatively constant during the period of the frame.

Claim 36

The method of claim 30 wherein said step of applying heuristic rules to selected characteristics of said received signal comprises evaluating a duration of multiple frames under the heuristic rule that the duration of a click signal is at most 0.25 seconds.

Claim 37

The method of claim 30 wherein said step of applying heuristic rules to selected characteristics of said received signal comprises evaluating a frame under the heuristic rule that the root mean square of a voice signal varies significantly over the period of the frame.

Claim 38

The method of claim 30 wherein said step of applying heuristic rules to selected characteristics of said received signal comprises: evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a busy signal is approximately 500 milliseconds; and evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a reorder signal is approximately 250 milliseconds.

Claim 39

An automated method of transferring a voice telephone message to an intended recipient in a telephone message delivery system comprising the steps of: a) receiving a telephone voice message; b) storing the received message in a storage device; c) calling an intended recipient; d) processing a received signal from said recipient having characteristics and received from a telephone line to determine if a true voice signal, comprising the steps of: e) defining a frame by measuring a plurality of samples from said received signal over a predetermined period; f) determining the linear prediction coding coefficients of a selected group of the plurality of samples; g) determining the variance of the linear prediction coding coefficients; h) comparing the variance to a reference variance; i) applying a heuristic rule based on a ring signal, a reorder signal, a click signal or a busy signal on a telephone line to a selected characteristic of said received signal to determine if said received signal comprises a voice signal and not a ring signal, a reorder signal, a click signal or a busy signal; and j) delivering said message if said voice signal is determined.

Claim 40

An automated method of transferring a voice telephone message to an intended recipient in a telephone message delivery system comprising the steps of: a) receiving a telephone voice message; b) storing the received message in a storage device; c) calling an intended recipient; d) processing a received signal from said recipient having characteristics and received from a telephone line to determine if a true voice signal, comprising the steps of: e) defining a frame by measuring a plurality of samples from said received signal over a predetermined period; f) determining the linear prediction coding coefficients of a selected group of the plurality of samples; g) determining the variance of the linear prediction coding coefficients; h) comparing the variance to a reference variance; i) applying a heuristic rule based on a ring signal, a reorder signal, a click signal or a busy signal on a telephone line to a selected characteristic of said received signal to determine if said received signal comprises a voice signal and not a ring signal, a reorder signal, a click signal or a busy signal; and j) delivering said message if said voice signal is determined.

Claim 41

The method of claim 36, wherein an storing step includes storing said indication of the recipient.

Claim 42

The method of claim 36, including the step of repeating the steps c through i to identify a voice signal when said received signal from said recipient is not a voice signal.

Claim 43

The method of claim 38, wherein said step of applying a heuristic rule to selected characteristics comprises evaluating a duration of multiple frames under the heuristic rule that the duration of a signal if at least 0.9 seconds but not longer than 2.5 seconds.

Claim 44

The method of claim 39, wherein said step of applying a heuristic rule to selected characteristics further comprises evaluating a frame under a heuristic rule that the root means square of a ring signal remains relatively constant during a period of the frame.

Claim 45

The method of claim 36, wherein said step of applying a heuristic rule to selected characteristics of said received signal comprises evaluating a duration of multiple frames under heuristic rule that the duration of a click signal is at most 0.25 seconds.

Claim 46

The method of claim 36, wherein said step of applying a heuristic rule to selected characteristics of said received signal comprises evaluating a frame under the heuristic rule that the root mean square of a voice signal varies significantly over a period of the frame.

Claim 47

The method of claim 36, wherein said step of applying a heuristic rule to selected characteristics of said received signal comprises; evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a busy signal is approximately 500 milliseconds; and evaluating a duration of multiple frames under the heuristic rule that the on/off interval of a reorder signal is approximately 250 milliseconds.