Communication system capable of improving a speech quality by cl

Details Communication system capable of improving a speech quality by cl Communication system capable of improving a speech quality by cl

1989-09-21

1991-05-21

Harkcom, Gary V.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 702

Patent

active

050182005

ABSTRACT:
A communication system having an encoder device used in combination with a decoder device for encoding a sequence of digital speech signals into a sequence of output signals, using a spectrum parameter and a pitch parameter. A subsidiary parameter of the digital speech signals is detected and monitored by a monitoring circuit. Digital speech signals are classified into voiced sound or voiceless sound and into vocality, nasal, fricative, or explosive durations at every frame. When a voiced sound, i.e., a vocality is detected, a predetermined number of excitation pulses are calculated during a representative subframe and are produced as primary sound source signals. A subsidiary information signal is produced during the remaining subframes to represent phase and amplitude correction factors in each of the subframes. When a voiceless sound, i.e., the nasal, the fricative, or the explosive is detected, noise signals and/or a plurality of excitation pulses are calculated for each frame and produced as secondary sound source signals.

REFERENCES:
patent: 4776015 (1988-10-01), Takeda et al.
patent: 4821324 (1989-04-01), Ozawa et al.
patent: 4881267 (1989-11-01), Taguchi

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