Telephone signal classification and phone message delivery method and system
AssigneeTexas Instruments Incorporated
InventorSang G. Oh
Life of this patent
Estimating the term…
Abstract
A method of processing a signal having characteristics and received from a telephone line is presented. The method includes defining a frame by measuring a plurality of samples from the signal over a predetermined period. Additionally, linear prediction coding coefficients of a selected group from the plurality of samples are determined. Further, the variance of the linear prediction coding coefficients are determined and the variances compared to a reference variance. A heuristic rule is applied to a selected characteristic of the signal to determine if the signal comprises a voice signal.
Claims43
A method of processing a received signal having characteristics and received from a telephone line to determine if a true voice signal, comprising:
- defining a frame by measuring a plurality of samples from said received signal over a predetermined period;
- determining the linear prediction coding coefficients of a selected group of the plurality of samples;
- determining the variance of the linear prediction coding coefficients;
- comparing the variance to a reference variance;
- and
- applying a heuristic rule based on a ring signal, a click signal, a reorder 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 click signal, a reorder signal or a busy signal.
A method of processing a received signal having characteristics and received from a telephone line to determine if a true voice signal, comprising:
- defining a frame by measuring a plurality of samples from said received signal over a predetermined period;
- determining the root means square of the plurality of samples over the predetermined period;
- determining the linear prediction coding coefficients of a selected group of the plurality of samples;
- determining the variance of the linear prediction coding coefficients;
- comparing the variance to a first reference variance;
- comparing the variance to a second reference variance;
- comparing the variance to a third reference variance;
- and
- applying a heuristic rule based on a ring signal, a reorder signal, a click signal or a busy signal to a selected characteristic of said received signal to determine if the signal is a voice signal and not a ring signal, a reorder signal, a click signal or a busy signal.
A method of processing a received signal having characteristics and received from a telephone line to determine if a true voice signal, comprising:
- defining a frame by measuring a plurality of samples from said received signal over a predetermined period;
- determining the root mean square of the plurality of samples over the predetermined period;
- measuring the zero crossing of the signal during the predetermined period;
- determining the linear prediction coding coefficients of a selected group of the plurality of samples;
- determining the variance of the linear prediction coding coefficients;
- comparing the variance to a reference variance;
- and
- applying heuristic rules based on a ring signal, a reorder signal, a click signal or a busy signal to selected characteristics 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.
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.
Dependencies are inferred from the claim text.