§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0658876A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Speech parameter encoder

Assignee: NEC Corp
•
Filing: 1994-12-09
•
Granted: —
•
Expires: 2014-12-09
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A speech parameter encoder capable of encoding spectrum parameters at a bit rate of 1 kb/s or less with comparatively small amount of operations and memory capacity. A spectrum parameter calculation unit (130) derives a spectrum parameter representing the spectrum envelope of a discrete input speech signal through division thereof into frames each having a predetermined time length. A weighted coefficient calculation unit (150) derives a weighted coefficient corresponding to an auditory masking threshold value through derivation thereof from the speech signal. A spectrum parameter quantization unit (160) receives the weighted coefficient and the spectrum parameter and centeses the spectrum parameter through search of a codebook such as to minimize the weighting distortion based on the weighted coefficient.

Inventors

  • 👤 Kazunori C/O Nec Corporation Ozawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 06:09
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/06; G10L19/07; G10L2019/0001; G10L2019/0013

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 97 words
A speech parameter encoder comprising: a spectrum parameter calculation unit for deriving a spectrum parameter representing the spectrum envelope of a discrete input speech signal through division thereof into frames each having a predetermined time length; a weighted coefficient calculation unit for deriving a weighted coefficient corresponding to an auditory masking threshold value through derivation thereof from the speech signal; and a spectrum parameter quantization unit for receiving the weighted coefficient and the spectrum parameter and quantizing the spectrum parameter through search of a codebook such as to minimize the weighting distortion based on the weighted coefficient.
Claim 2
Dependent Claim 39 words
The speech parameter encoder according to claim 1, wherein said weighted coefficient calculation unit includes a weighted coefficient calculation unit for deriving a weighted coefficient corresponding to an auditory masking threshold value through derivation thereof from the spectrum parameter.
Claim 3
Dependent Claim 34 words
The speech parameter encoder according to claim 1, wherein said spectrum parameter calculation unit includes a spectrum parameter calculation unit which makes non-linear transform of the spectrum parameter such as to meet auditory characteristics.
Claim 4
Dependent Claim 34 words
The speech parameter encoder according to claim 2, wherein the spectrum parameter calculation unit includes a spectrum parameter calculation unit which makes non-linear transform of the spectrum parameter such as to meet auditory characteristics.
Claim 5
Dependent Claim 35 words
The speech parameter encoder according to claim 1, wherein said spectrum parameter calculation unit performs a linear transform of the spectrum parameter such as to meet auditory sense characteristics before the quantization of spectrum parameter.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag