Frequency domain format enhancement

1. A method for enhancing speech prediction coefficient signals, comprising:

a) receiving a set of prediction coefficient signals:

b) calculating a set of amplitude spectrum coefficient signals based on said prediction coefficient signals;

c) calculating a set of enhancement coefficient signals based on said amplitude spectrum coefficient signals;

d) calculating a set of enhanced autocorrelation coefficient signals based on said enhancement coefficient signals;

e) converting at least some of said enhanced autocorrelation coefficient signals into reflection coefficient signals;

f) testing the range of values of said reflection coefficient signals; and

g) converting at least some of said tested reflection coefficient signals into prediction coefficient signals.

2. The method according to claim 1 , wherein step b) comprises calculating said amplitude spectrum coefficient signals at predetermined intervals within a predetermined frequency range.

3. A device for enhancing speech prediction coefficient signals, comprising:

a) means for receiving a set of prediction coefficient signals;

b) means for calculating a set of amplitude spectrum coefficient signals based on said prediction coefficient signals;

c) means for calculating a set of enhancement coefficient signals based on said amplitude spectrum coefficient signals;

d) means for calculating a set of enhanced autocorrelation coefficient signals based on said enhancement coefficient signals;

e) means for converting at least some of said autocorrelation coefficient signals into reflection coefficient signals;

f) means for testing the range of values of said reflection coefficient signals; and

g) means for converting at least some of said reflection coefficient signals into enhanced prediction coefficient signals.

4. A method for enhancing coded speech signals, comprising:

a) receiving a set of prediction coefficient signals;

b) calculating a set of amplitude spectrum coefficient signals based on said prediction coefficient signals;

c) calculating a set of enhancement coefficient signals based on said amplitude spectrum coefficient signals;

d) calculating a set a of enhanced autocorrelation coefficient signals based on said enhancement coefficient signals;

e) converting at least some of said enhanced autocorrelation coefficient signals into reflection coefficient signals;

f) testing the range of values of said reflection coefficient signals;

g) converting at least some of said reflection coefficient signals into prediction coefficient signals;

h) receiving coded speech signals; and

i) processing said coded speech signals based on said enhanced prediction coefficient signals.

5. A device for enhancing coded speech signals, comprising:

a) means for receiving a set of prediction coefficient signals;

b) means for calculating a set of amplitude spectrum coefficient signals based on said prediction coefficient signals;

c) means for calculating a set of enhancement coefficient signals based on said amplitude spectrum coefficient signals;

d) means for calculating a set of enhanced autocorrelation coefficient signals based on said enhancement coefficient signals;

e) means for converting at least some of said autocorrelation coefficient signals into reflection coefficient signals;

f) means for testing the range of values of said reflection coefficient signals;

g) means for converting at least some of said reflection coefficient signals into enhanced prediction coefficient signals;

h) means for receiving coded speech signals; and

i) means for processing said received coded speech signals based on said enhanced prediction coefficient signals.

6. The device according to claim 5 , wherein step b) comprises a means for calculating said amplitude spectrum coefficient signals at predetermined intervals within a predetermined frequency range.