Claims
- 1. In a multichannel audio system, apparatus for improving bass comprising,
- a plurality of upper frequency channels for radiating upper frequency sound including L and R signals, an L-R signal and an R-L signal,
- a lesser number of bass channels for radiating a sound signal characterized by spectral components in the bass frequency range,
- detection circuitry providing detected signals representative of the contemporary amplitude of the L-R and R-L signals in the upper frequency channels and said L signal+said R signal,
- a processing circuit for processing the detected signals to provide a bass gain signal,
- and a gain controller responsive to the bass gain signal for controlling the bass channel gain so that the perceived frequency response of the overall system comprising said upper frequency channels and said lesser number of bass channels remains substantially constant in the presence of variable signal levels in the different upper frequency channels,
- said processing circuit comprising,
- a first circuit for receiving a first detected signal representative of the magnitude of said L signal+said R signal,
- a second circuit for receiving a second detected signal representative of the magnitude of said L signal-said R signal,
- a combining circuit for combining said first and second detected signals to provide said bass gain signal,
- said lesser number of bass channels comprising a variable gain amplifier having an input for receiving the bass spectral components of said L signal+said R signal and an output and a gain control input,
- said gain control input receiving said bass gain signal.
Parent Case Info
This application is a continuing application of application Ser. No. 07/274,381 filed Nov. 21, 1988.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4024344 |
Dolby et al. |
May 1977 |
|
4503554 |
Davis |
Mar 1985 |
|
Continuations (1)
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Number |
Date |
Country |
Parent |
274381 |
Nov 1988 |
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