Phone calls. Mobile HD Voice allows you to have a conversation which is so natural it sounds like you're in the same room as the person you're talking to

2. Voice is Still the King
the voice and data revenue for the North American
market

3. Market study

6. The older standards
severely limit the range of
audio frequencies from
300Hz to 3400Hz.
8000 sound samples are
taken.
Problems distinguishing “m”
,“n” , “p” ,“t” , “s” ……
(higher frequencies ).
The resulting “telephone
speech” sounds harsh
and unnatural.

7. the frequencies at which
the sound is transmitted
can reach 50HZ to
7KHZ.
doubling the number of
samplings in one
second, taking 16000 of
them.
This increases the
amount of sound details
and makes the
conversation feel more
real.

8. Applications of HD voice
Fixed and mobile phone calls be
more clear.
voice-mail playback be clear.
Conference calls would be more
effective
Improving the voice recognition
application over phone.
Improving translations in speech-
to-text application , that
important for deaf people.

9. HD Voice Market Trends
Orange plans to rapidly extend the range of HD
voice-compatible mobile handsets and introduce
HD voice services to the majority of countries
across its footprint by the end of 2011.
HD voice service has already introduced to the
markets in Moldova, Armenia, Belgium, France,
Spain and the United Kingdom.
The service will provide customers of Egypt's
leading mobile operator, Mobinil.

10. HD Voice traffic over the next three
years

11. SEA
sa

12. Spectral Analysis

13. HD voice standards

14. the block diagram of G.722 Codec.

15. Evaluation
part

16. 1- Objective Speech Quality Measures
Objective measurements can give an
immediate and reliable estimate of the
perceptual quality of a coding algorithm
-Signal-to-Noise Ratio (SNR):
SNR computes the energy in the original
signal relative to the energy of the noise.
The SNR is computed as follow:

17. Input speech signal.
Output speech signal.

18. Input speech spectrum
output speech spectrum

19. So from the table shown, MOS is computed as follow:
Mos = Total sum of rates/No. of listeners = 60/15 = 4