Audio signal energy level detection method and apparatus

Details Audio signal energy level detection method and apparatus Audio signal energy level detection method and apparatus

1990-10-17

1992-12-08

Ng, Jin F.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

381107, 381102, 381 22, H03G 700

Patent

active

051704374

ABSTRACT:
An audio signal energy level detector for use with audio signal processing is described. The energy level detector includes a high-pass filter series-connected between an audio input signal and a series-connected rectifier and integrator the output of which is connectable to the control input of a variable gain device that processes the audio input signal. A characteristically -10 db/decade amplitude versus frequency slope audio input signal is high-pass filtered, rectified and smoothed to produce a constant-energy, DC gain control signal. When the audio input signal is processed in accordance with the invention by the variable gain device to produce an audio output signal suitable for dynamic, downstream processing, the tonal balance and timbre of the audio input signal are preserved. Passive and active, half-order, five-stage high-pass filters are described that provide the desired +10 db/decade amplitude versus frequency slope over the audio frequency range.

REFERENCES:
patent: 4122254 (1978-09-01), Blackmer
patent: 4220929 (1980-09-01), Talbot et al.
patent: 4363007 (1982-12-01), Haramoto et al.
patent: 4398157 (1983-08-01), Dieterich
patent: 4455676 (1984-06-01), Kaneda
patent: 4465981 (1984-08-01), Pike
patent: 4602218 (1986-07-01), Vilmur et al.
patent: 4922535 (1990-05-01), Dolby

Affiliated with

Also associated with

Rating

Audio signal energy level detection method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Audio signal energy level detection method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio signal energy level detection method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-965722