Apparatus and method for substantially eliminating noise in an a

Details Apparatus and method for substantially eliminating noise in an a Apparatus and method for substantially eliminating noise in an a

1995-01-09

1997-10-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

4552001, 395 224, H04B 110

Patent

active

056782217

ABSTRACT:
A method and apparatus, performed by a communication unit (101), for substantially eliminating undesired noise in an audible output signal (113) while a determined quality measure (114) of a received signal (107) is below a predetermined threshold (201). At least a portion the received signal (107) is stored for a predetermined period of time to produce a stored signal (109). A measure of pitch period (111) of the stored signal (109) is determined. When the determined quality measure (114) of the received signal (107) drops below the predetermined threshold (201), a portion of the stored signal (109) is used, responsive to the determined measure of the pitch period (111), to produce the audible output signal (113). To match a boundary between an end of the received signal (107) and an end of the portion of the stored signal (109) a discontinuity between the end of the received signal (107) and the end of the portion of the stored signal (109) at the boundary is determined. Values for a predetermined correction function responsive to the measured discontinuity are determined. The predetermined correction function is applied to the end of the portion of the stored signal (109) to align the end of the portion of the stored signal (109) with the end of the received signal (107) at the boundary. When the determined quality measure (114) of the received signal (107) rises above the predetermined threshold (201), the received signal (107) is used to produce the audible output signal (113).

REFERENCES:
patent: 5054078 (1991-10-01), Schorman et al.
patent: 5140704 (1992-08-01), Ueno
Wasem, Ondria J., "The Effect of Waveform Subtitution on the Quality of PCM Packet Communications", Mar. 1988, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 36, No. 3, pp. 342-348.

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