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US 2003/0210792 A1Published application
Expanded stereophonic circuit with tonal compensation
AssigneeThomson Licensing
InventorAlan Anderson Hoover
Life of this patent
Estimating the term…
Abstract
A stereophonic processing system provided with spatial expansion of the stereophonic sound so that a pair of spaced-apart loudspeakers will acoustically appear to be spaced apart further then they actually are. The spatial expansion circuit includes tonal compensation.
Claims12
A stereophonic expansion circuit for L and R signal channels, comprising;
- each of the L and R signal channels having respective first and second amplifiers, each amplifier having respective non-inverting and inverting input terminals and an output terminal, one of said respective input terminals of each amplifier receiving a respective input signal;
- a feedback path coupled between the respective output terminal and the other of said respective input terminals not receiving an input signal;
- circuit means for coupling signals between the other of said input terminals, for providing a psycho-acoustic expansion effect at the respective output terminals, and
- tonal compensation of the L and R expanded signals by a frequency dependent circuit coupled between the input terminals receiving an input signal and an output signal node coupled to the respective output terminals.
1 more element
A stereophonic expansion circuit for L and R signal channels, comprising;
- each of the L and R signal channels having respective first and second amplifiers, each amplifier having respective non-inverting and inverting input terminals and an output terminal, one of said respective input terminals of each amplifier receiving a respective input signal;
- a feedback path coupled between the respective output terminal and the other of said respective input terminals not receiving an input signal;
- circuit means for coupling signals between the other of said input terminals, for providing a psycho-acoustic expansion effect at the respective output terminals, and
- tonal compensation of the L and R expanded signals by a frequency dependent circuit coupled between the input terminals receiving an input signal and an output signal node coupled to the respective output terminals, the tonal compensation including cross-coupling between the channels, the cross-coupling between channels including forming an L+R signal node, the signal at the L+R signal node being added to each of the expanded output signals.
1 more element
A stereophonic expansion circuit for L and R signal channels, comprising;
- each of the L and R signal channels having respective first and second amplifiers, each amplifier having respective non-inverting and inverting input terminals and an output terminal, one of said respective input terminals of each amplifier receiving a respective input signal;
- a feedback path coupled between the respective output terminal and the other of said respective input terminals not receiving an input signal;
- circuit means for coupling signals between the other of said input terminals, for providing a psycho-acoustic expansion effect at the respective output terminals, and
- tonal compensation of the L and R expanded signals by a frequency dependent circuit coupled between the input terminals receiving a signal and an output signal node coupled to the respective output terminals, the frequency compensating circuit comprising resistive and capacitive components, the resistive and capacitive components comprising at least one of a low pass filter and a high pass filter.
1 more element
A circuit comprising;
- at least a pair of signal channels having respective amplifiers, each channel having an amplifier, each amplifier having respective non-inverting and inverting input terminals, and an output terminal, one of said respective input terminals of each amplifier receiving a respective input signal;
- a feedback path coupled between the respective output terminal and the other of said respective input terminals not receiving an input signal, and
- means for coupling a frequency dependent circuit between the at least two input terminals receiving a signal and between each of an at least two output signal nodes coupled to the respective output terminals.
Dependencies are inferred from the claim text.