System and method for low overhead frequency domain voice authentication

• US 8,510,104 B2
• Filed: 09/14/2012
• Issued: 08/13/2013
• Est. Priority Date: 11/10/2009
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Adibi, Sasan
• Primary Examiner(s): Lerner, Martin
• Application Number:
  US13/617,151
• Publication Number:
  US 20130013309A1
• Time in Patent Office: 333 Days
• Field of Search: 704/224, 704/231, 704/243, 704/246, 704/250, 704/273, 704/205, 704/206
• US Class Current: 704/205
• CPC Class Codes: G10L 17/00 Speaker identification or verification techniques
• CPC Class Codes: G10L 17/02 Preprocessing operations, e.g. segment selection; Pattern representation or modelling, e.g. based on linear discriminant analysis [LDA] or principal components; Feature selection or extraction

Abstract

A system and method are provided to authenticate a voice in a frequency domain. A voice in the time domain is transformed to a signal in the frequency domain. The first harmonic is set to a predetermined frequency and the other harmonic components are equalized. Similarly, the amplitude of the first harmonic is set to a predetermined amplitude, and the harmonic components are also equalized. The voice signal is then filtered. The amplitudes of each of the harmonic components are then digitized into bits to form at least part of a voice ID. In another system and method, a voice is authenticated in a time domain. The initial rise time, initial fall time, second rise time, second fall time and final oscillation time are digitized into bits to form at least part of a voice ID. The voice IDs are used to authenticate a user'"'"'s voice.

Claims

1. A method of generating a voice identification comprising:

a processor transforming one or more periods of a voice signal from a time domain to a frequency domain;

setting an amplitude of a first harmonic to a first amplitude and adjusting each amplitude of one or more other harmonics to maintain relative gain to said first harmonic;

setting a frequency of said first harmonic of said transformed voice signal to a first frequency and adjusting each frequency of one or more other harmonics to maintain harmonic series relative to said first harmonic;

filtering said transformed voice signal, the filtered transformed voice signal comprising one or more remaining harmonics;

digitizing the amplitude of each of said one or more remaining harmonics into a first number of bits;

digitizing the number of said one or more remaining harmonics into a second number of bits;

concatenating said first number of bits and said second number of bits to form said voice identification data; and

storing said voice identification.

2. The method of claim 1 further comprising using the voice authentication data in a multi-level password scheme.

3. The method of claim 1 further comprising using the voice authentication scheme in a signature encryption scheme.

4. The method of claim 1 further comprising determining additional voice data is necessary and prompting for an additional voice signal using a visual prompt or an audio prompt.

5. The method of claim 1 further comprising storing unprocessed frequency and amplitude information of the first harmonic in a voice database.

6. The method of claim 5 further comprising processing the unprocessed information for computing trends and correlations in voice data.

7. The method of claim 1 wherein the voice signal is characterized by a plurality of segments.

8. The method of claim 7 wherein each of the segments are associated with a minimum time duration.

9. A non-transitory computer readable medium comprising computer executable instructions for generating a voice identification in a frequency domain, said computer readable medium comprising instructions for:

transforming one or more periods of a voice signal from a time domain to said frequency domain;

setting an amplitude of a first harmonic to a first amplitude and adjusting each amplitude of one or more other harmonics to maintain relative gain to said first harmonic;

setting a frequency of said first harmonic of said transformed voice signal to a first frequency and adjusting each frequency of one or more other harmonics to maintain harmonic series relative to said first harmonic;

filtering said transformed voice signal, including removing one or more frequency components that are above a threshold harmonic, the filtered transformed voice signal comprising one or more remaining harmonics;

digitizing the amplitude of each of said one or more remaining harmonics into a first number of bits;

digitizing the number of said one or more remaining harmonics into a second number of bits; and

,

concatenating said first number of bits and said second number of bits to form said voice identification; and

storing voice identification.

10. The non-transitory computer readable medium in claim 9 further comprising using the voice authentication data in a multi-level password scheme.

11. The non-transitory computer readable medium in claim 9 further comprising using the voice authentication scheme in a signature encryption scheme.

12. The non-transitory computer readable medium in claim 9 further comprising determining additional voice data is necessary and prompting for an additional voice signal using a visual prompt or an audio prompt.

13. The non-transitory computer readable medium in claim 9 further comprising storing unprocessed frequency and amplitude information of the first harmonic in a voice database.

14. The non-transitory computer readable medium in claim 13 further comprising processing the unprocessed information for computing trends and correlations in voice data.

15. The non-transitory computer readable medium in claim 9 wherein the voice signal is characterized by a plurality of measured segments.

16. The non-transitory computer readable medium in claim 15 wherein each of the segments are associated with a minimum time duration.

17. A mobile device for generating a voice identification in a frequency domain, said mobile device comprising a processor and a memory, said memory includes computer executable instructions for:

using the processor for transforming one or more periods of a voice signal from a time domain to said frequency domain;

setting an amplitude of a first harmonic to a first amplitude and adjusting each amplitude of one or more other harmonics to maintain relative gain to said first harmonic;

setting a frequency of said first harmonic of said transformed voice signal to a first frequency and adjusting each frequency of one or more other harmonics to maintain harmonic series relative to said first harmonic;

filtering said transformed voice signal, including removing one or more frequency components that are above a threshold harmonic, the filtered transformed voice signal comprising one or more remaining harmonics;

digitizing the amplitude of each of said one or more remaining harmonics into a first number of bits;

digitizing the number of said one or more remaining harmonics into a second number of bits;

and,

concatenating said first number of bits and said second number of bits to form said voice identification; and

storing voice identification.