× Close
Join the Ques10 Community
Ques10 is a community of thousands of students, teachers, and academic experts, just like you.
Join them; it only takes a minute
Sign up
Question: Draw a block schematic for channel encoder and decoder and explain operations
0

Subject: Speech Processing

Topic: LPC and Parametric Speech Coding

Difficulty: Low

sp(38) • 190 views
ADD COMMENTlink
modified 3 months ago by gravatar for Manan Bothra Manan Bothra0 written 4 months ago by gravatar for awari.swati831 awari.swati831160
0

(i) Channel vocoders: Channel vocoder models the vocal tract as bank of band-pass filters. The analysis filter at the transmitter side finds the average square value of energy for input speech 50 times per second.

Channel vocoder transmitter block

Receiver for channel vocoder

(ii) Basically, channel vocoder try to match the frequency profile of the input speech signal.

(iii) They do not reproduce the speech sample.

(iv) It can be seen that not all frequency components speech signal are important. The vocal tract resonant at formants frequency. Formant vocoders are developed to use the frequency.

(v) The range of formant frequency known so the formants are estimated along with bandwidth from a speech segment using a bank of filters designed to match the range of formants.

(vi) At the receiver end, the excitation signal-either a periodic pulse train is used to excite the tunable filter that are tuned to $ R_x $.

ADD COMMENTlink
written 3 months ago by gravatar for Manan Bothra Manan Bothra0
Please log in to add an answer.


Use of this site constitutes acceptance of our User Agreement and Privacy Policy.