Spectral transposition of a digital audio signal

Details Spectral transposition of a digital audio signal Spectral transposition of a digital audio signal

1996-06-20

1998-06-23

Le, Huyen

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 68, 381 684, H04R 2500

Patent

active

057712999

ABSTRACT:
In this spectral transposition system for digital audio signals, the coefficients in an analysis filter are passed directly to the synthesis filter so that the coefficients in both filters match. The single unit delays in either or both of the analysis and synthesis filters are replaced by all-pass filters that provide a non-integer delay or an integer delay where the integer is greater than one. Thereby the transfer function for the analysis filter and/or synthesis filter is compressed/expanded depending on the transfer function of the all-pass filters. Thus, the dominant peaks or formants in the frequency spectrum of the resynthesized audio signal is transported to a user determined frequency range. The delay may be constant or variable over frequency. If the delay is variable over frequency so that it is other than 1.0 in the portion of the spectrum of interest for transposition of the spectral envelope and returns to 1.0 at the ends of the spectrum, the spectral envelope may be compressed or expanded without replication.

REFERENCES:
patent: 4051331 (1977-09-01), Strong et al.
patent: 5488704 (1996-01-01), Fujimoto

Affiliated with

Also associated with

Rating

Spectral transposition of a digital audio signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spectral transposition of a digital audio signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral transposition of a digital audio signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1399915