Method and apparatus for applying multiple speech processing features to a telephone call

• US 5,859,908 A
• Filed: 12/18/1996
• Issued: 01/12/1999
• Est. Priority Date: 03/28/1996
• Status: Expired due to Fees

• Current Assignee: Nuance Communications, Inc. (Microsoft Corporation)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Haller, Michael Joseph, McMaster, John A., Songrady, John C., Wasilewski, Thomas, Youtkus, Donald Joseph, Begeja, Lee, Creswell, Carroll W., Furman, Daniel Selig
• Primary Examiner(s): Wolinsky, Scott
• Application Number:
  US08/767,358
• Time in Patent Office: 755 Days
• Field of Search: 379/67, 379/88, 379/201, 379/387, 379/390-1, 379/406, 379/410, 379/142, 379/207, 379/211, 379/215, 379/216, 379/265-6, 379/355, 379/388, 379/395, 379/89, 379/409, 364/513.5, 704/225, 704/233, 704/243, 704/200, 704/207, 704/251, 455/563, 455/564, 455/570, 381/106, 381/108, 381/49, 381/68.2, 381/94.3, 381/94.7, 179/98, 367/93
• US Class Current: 379/406.03
• CPC Class Codes: H04M 3/002 Applications of echo suppressors or cancellers in telephonic connections in two-way loud-speaking telephone systems H04M9/08, echo suppressors or cancellers per se H04B3/20
• CPC Class Codes: H04M 3/40 Applications of speech amplifiers

Abstract

A speech processor uses a plurality of speech processing features to enhance the quality of speech signals received by a user during a telephone call. The activation of a second speech processing feature is delayed for a time duration measured after the initiation of a particular call or measured after the activation of a first speech processing feature. This delay eliminates any interference between the second speech processing feature and the first speech processing feature that is active when the call is initiated. The delay also increases the time it takes for the speech processing features to become fully effective, thus making the enhancement in the quality of the speech signals more noticeable to the user. Further, an optionally generated audio indicator is provided when the second speech processing feature is applied so that the additional feature is even more noticeable to the user.

Claims

1. A method of gradually enhancing the quality of speech signals generated by a first user and received by a second user during a telephone call such that the enhanced quality of the speech signals is more noticeable to the second user, the method comprising the steps of:

upon initiation of the telephone call, applying a first speech enhancement processing feature to the speech signals generated by the first user for a predetermined time period, wherein said first speech processing feature converges during said predetermined time period; and

in response to an expiration of said predetermined time period, applying both the first speech enhancement processing feature and a second speech enhancement processing feature to the speech signals generated by the first user during the remainder of the telephone call.

2. The method of claim 1, further comprising the step of:

sending an audio alert to the second user at said expiration of said predetermined time period.

3. The method of claim 1, wherein said first speech enhancement processing feature is echo cancellation and said second speech enhancement processing feature is background noise compensation.

4. The method of claim 1, further comprising the step of;

delaying the time the speech signals are received by the second user during said predetermined time period.

5. The method of claim 1, wherein said predetermined time period is measured from when the telephone call is initiated.

6. The method of claim 1, wherein said predetermined time period is measured from when the second user has answered the telephone call.

7. A speech processor for gradually enhancing the quality of speech signals generated by a first user and received by a second user during a telephone call such that the enhanced quality of the speech signals is more noticeable to the second user, the speech processor comprising

a first speech enhancement processor;

and

a second speech enhancement processor selectively coupled to said first speech enhancement processor;

wherein upon initiation of the telephone call, said first speech enhancement processor applies a first speech enhancement processing feature to the speech signals generated by the first user for a predetermined time period, wherein said first speech processing feature converges during said predetermined time period; and

in response to an expiration of said predetermined time period, said second speech enhancement processor applies a second speech enhancement processing feature and said first speech enhancement processor applies the first speech enhancement processing feature to the speech signals generated by the first user during the remainder of the telephone call.

8. The speech processor of claim 7, further comprising:

an audio alert generator selectively coupled to said second speech enhancement processor that sends an audio alert to the second user at said expiration of said predetermined time period.

9. The speech processor of claim 7, wherein said first speech enhancement processing feature is echo cancellation and said second speech enhancement processing feature is background noise compensation.

10. The speech processor of claim 7, further comprising:

a delay unit selectively coupled to said second speech enhancement processor that delays the time the speech signals are received by the second user during said predetermined time period.

11. The speech processor of claim 7, wherein said predetermined time period is measured from when the telephone call is initiated.

12. The speech processor of claim 7, wherein said predetermined time period is measured from when the second user has answered the telephone call.

13. A speech processing system for gradually enhancing the quality of speech signals generated by a first user and received by a second user during a telephone call such that the enhanced quality of the speech signals is more noticeable to the second user, said system comprising:

means for applying, upon initiation of the telephone call, a first speech enhancement processing feature to the speech signals generated by the first user for a predetermined time period, wherein said first speech processing feature converges during said predetermined time period; and

means for applying, in response to an expiration of said predetermined time period, both the first speech enhancement processing feature and a second speech enhancement processing feature to the speech signals generated by the first user during the remainder of the telephone call.

14. The speech processing system of claim 13, further comprising:

means for sending an audio alert to the second user at said expiration of said predetermined time period.

15. The speech processing system of claim 13, wherein said first speech enhancement processing feature is echo cancellation and said second speech enhancement processing feature is background noise compensation.

16. The speech processing system of claim 13, further comprising:

means for delaying the time the speech signals are received by the second user during said predetermined time period.

17. The speech processing system of claim 13, wherein said predetermined time period is measured from when the telephone call is initiated.

18. The speech processing system of claim 13, wherein said predetermined time period is measured from when the second user has answered the telephone call.