Reconstruction of wideband speech from narrowband speech using c

Details Reconstruction of wideband speech from narrowband speech using c Reconstruction of wideband speech from narrowband speech using c

1993-09-29

1996-12-03

MacDonald, Allen R.

395229, 395 232, G01L 900

Patent

active

055816525

ABSTRACT:
A wideband speech signal (8 kHz, for example) of high quantity is reconstructed from a narrowband speech signal (300 Hz to 3.4 kHz). The input narrowband speech signal is LPC-analyzed to obtain spectrum information parameters, and the parameters are vector-quantized using a narrowband speech signal codebook. For each code number of the narrowband speech signal codebook, the wideband speech waveform corresponding to the codevector concerned is extracted by one pitch for voiced speech and by one frame for unvoiced speech and prestored in a representative waveform codebook. Representative waveform segments corresponding to the respective output codevector numbers of the quantizer are extracted from the representative waveform codebook. Voiced speech is synthesized by pitch-synchronous overlapping of the extracted representative waveform segments and unvoiced speech is synthesized by randomly using waveforms of one frame length. By this, a wideband speech signal is produced. Then, frequency components below 300 Hz and above 3.4 kHz are extracted from the wideband speech signal and are added to an up-sampled version of the input narrowband speech signal to thereby reconstruct the wideband speech signal.

REFERENCES:
patent: 4296279 (1981-10-01), Stork
patent: 4330689 (1982-05-01), Kang et al.
patent: 4701955 (1987-10-01), Taguchi
patent: 4776014 (1988-10-01), Zinser, Jr.
patent: 4956871 (1990-11-01), Swaminathan
patent: 4963030 (1990-10-01), Makur
patent: 5046099 (1991-09-01), Nishimura
patent: 5271089 (1993-12-01), Ozawa
patent: 5293449 (1994-03-01), Tzeng
patent: 5353374 (1994-10-01), Wilson et al.
patent: 5371853 (1994-12-01), Kao et al.
patent: 5432883 (1995-07-01), Yoshihara

Affiliated with

Also associated with

Rating

Reconstruction of wideband speech from narrowband speech using c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reconstruction of wideband speech from narrowband speech using c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconstruction of wideband speech from narrowband speech using c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-792639