# US 8,787,598 B2 · Dynamic contoured-sound/subwoofer-synthesis audio system

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- Number: US 8,787,598 B2
- Document ID: US8787598B2
- Status: Granted
- Kind: B2
- Application number: 12/471,427
- Filed: 2009-05-25
- Published: 2009-11-26
- Granted: 2014-07-22
- Earliest claimed: 2008-05-26
- Assignees: Paul G. Berg
- Applicants: Paul G. Berg
- Inventors: Paul G. Berg
- Web page: https://patentgrep.com/patent/US8787598B2

## CPC

- H03F 1/34: Negative-feedback-circuit arrangements with or without positive feedback (H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence {; for rejection of common mode signals H03F3/45479})
- H03F 3/187: in integrated circuits
- H03F 2200/03: the amplifier being designed for audio applications
- H03F 2200/165: A filter circuit coupled to the input of an amplifier
- H03F 2203/45138: Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers
- H03F 2203/45521: the FBC comprising op amp stages, e.g. cascaded stages of the dif amp and being coupled between the LC and the IC
- H03F 2203/45526: the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC
- H03F: AMPLIFIERS

## Abstract

A dynamic sound enhancement system and method which produces non-linear dynamic gain, time domain offset, and damping control in relation to frequency components of an applied audio signal. The functions and characteristics of the system make it feasible to extend the ability of small speakers to distinctly reproduce natural low frequencies including bass and sub-bass frequencies concurrently with high frequencies. Further, the system provides customization of system characteristics for obtaining optimized sound quality, audibility, and sound perception from diverse sound producing devices, and which satisfies diverse user hearing needs and listening preferences.

## Claims

### Claim 1

A dynamic sound enhancement system that produces extreme low frequency sound, in the bass and sub-bass range, 50-250 Hz and below 50 Hz respectively, from all speaker and earpiece types including standard speakers, small speakers, personal earpieces, and hearing aids, that substantially compensates for the natural inadequacy of the human ear at both low and high frequencies, below 250 Hz and above 10,000 Hz respectively, and that substantially compensates for the frequency roll-off effects of standard speakers and other sound producing devices, comprising:
a low frequency adjustment sub-system operable to provide a variety of low frequency responses in response to adjustments of an adjustable element, embodied with a plurality of step settings, each setting producing a different low frequency response thus allowing or preventing preferred low frequencies from reaching the system gain sub-system;
a gain sub-system operable to invert input signal polarity, adjust the magnitude of applied frequencies dynamically, integrate feedback signals from other sub-systems with newly arriving input signals concurrently and present the resulting composite signal at its output;
a low frequency feedback control sub-system operable to provide low frequency responses in relation to applied frequency thereby determining the bandwidth and magnitude of low frequency feedback signals applied to the input of the gain subsystem and contributing to regulation of bass and sub-bass frequency signal magnitude at the gain sub-system output;
a low frequency phase offset sub-system operable to provide variable plus and minus feedback time offsets for preferred bass frequencies in relation to non-preferred frequencies embodied to produce time offsets encompassing up to several milliseconds of time which occur before (plus offset) and after (minus offset) in relation to non-preferred feedback frequencies;
a band pass feedback control subsystem operable to provide a broad pass frequency band while concurrently attenuating the magnitude of applied feedback frequencies prior to conveying those frequencies to the gain sub-system thereby contributing to the regulation of system dynamic gain;
a low frequency damping subsystem operable to provide supplementary regulation of the magnitude and shape of low frequency output signals thereby controlling sound producing device distortion artifacts by the method of controlling decay rate of the final output signal magnitude after the signal reaches a threshold gain defined in conjunction with a setting of the low frequency adjustment sub-system;
a high frequency adjustment sub-system operable to provide a variety of high frequency responses in response to adjustments of an adjustable element, embodied with a plurality of step settings, each setting producing a different high frequency cutoff thus allowing or preventing preferred high frequencies from reaching the system gain sub-system;
a high frequency damping subsystem operable to provide supplementary regulation of the magnitude and shape of high frequency output signals thereby controlling sound producing device distortion artifacts by the method of controlling decay rate of the final output signal magnitude after the signal reaches a threshold gain defined in conjunction with a setting of the high frequency adjustment sub-system, and
a high frequency phase offset sub-system operable to provide variable plus and minus feedback time offsets for preferred treble frequencies in relation to non-preferred frequencies embodied to produce time offsets encompassing up to several milliseconds of time which occur before (plus offset) and after (minus offset) in relation to non-preferred feedback frequencies.

### Claim 2 (depends on 1)

The dynamic sound enhancement system of claim 1, wherein dynamic signal gain is produced in relation to frequency composition of the applied audio signal.

### Claim 3 (depends on 1)

The dynamic sound enhancement system of claim 1, wherein dynamic signal gain is a non-linear function of applied audio signal frequency composition.

### Claim 4 (depends on 1)

The dynamic sound enhancement system of claim 1, wherein audio signals applied at the system input concurrently are, in relation to frequency, offset in time and presented at the system output at non-concurrent intervals of several milliseconds.

### Claim 5 (depends on 1)

The dynamic sound enhancement system of claim 1, wherein bass and sub-bass audio signal frequencies presented at the system output are damped by controlled decay of the output signal magnitude.

### Claim 6 (depends on 1)

The dynamic sound enhancement system of claim 1, wherein treble audio signal frequencies presented at the system output are damped by controlled decay of the output signal magnitude.

### Claim 7 (depends on 1)

The dynamic sound enhancement system of claim 1, wherein preferred low and high audio frequencies, corresponding magnitudes of dynamic gain and phase offset, are adjustable by user control producing customizable system characteristics.

### Claim 8

A dynamic sound enhancement method that produces extreme low frequency sound, in the bass and sub-bass range, 50-250 Hz and below 50 Hz respectively, from all speaker and earpiece types including standard speakers, small speakers, personal earpieces, and hearing aids, that substantially compensates for the natural inadequacy of the human ear at both low and high frequencies, below 250 Hz and above 10,000 Hz respectively, and that substantially compensates for the frequency roll-off effects of standard speakers and other sound producing devices, comprising:
reducing magnitude of low frequency components encompassed within a composite audio input signal based on preferential low frequency sound enhancement characteristics;
inverting polarity of said audio input signal and;
increasing its magnitude by an amount proportional with preferential sound enhancement and sound producing device characteristics;
attenuating the magnitude of the increased magnitude-inverted polarity signal proportional with preferential sound enhancement and sound producing device characteristics and;
integrating the attenuated signal with newly arriving audio signals which have completed the first step of this claim;
continuously repeating the methodology of the prior four steps.

### Claim 9 (depends on 8)

The dynamic sound enhancement method of claim 8, wherein;
reducing magnitude of low frequency components encompassed within an inverted polarity and increased magnitude signal as defined in steps two and three of claim 8, based on preferential low frequency sound enhancement and sound producing device characteristics;
offsetting in time preferential low frequency components of said audio signals from higher frequency components such that signals concurrent in time at the beginning of the step are offset to be non-concurrent at the completion of the step by intervals of several milliseconds;
integrating the offset frequency signals with newly arriving audio signals which have completed the first step of claim 8;
continuously repeating the methodology of the prior three steps.

### Claim 10 (depends on 8)

The dynamic sound enhancement method of claim 8, wherein;
reducing magnitude of high frequency components encompassed within an inverted polarity and increased magnitude signal of steps two and three of claim 8, based on preferential high frequency sound enhancement characteristics;
regulating the magnitude and shape of high frequency signals encompassed within said audio signal by controlling decay of high frequency signal magnitude based on preferential high frequency sound enhancement and sound producing device characteristics;
offsetting in time preferential high frequency components of said audio signals from lower frequency components such that signals concurrent in time at the beginning of the step are offset to be non-concurrent at the completion of the step by intervals of several milliseconds;
integrating said offset frequency signals with newly arriving audio signals which have completed the first step of claim 8;
continuously repeating the methodology of the prior four steps.

### Claim 11 (depends on 8, 9, 10)

The dynamic sound enhancement method of claim 8, wherein;
regulating the magnitude and shape of low frequency signal components encompassed within an audio signal resulting from the combined interactions of the composite methods heretofore described within claims 8-10 by controlling decay of low frequency signal magnitude based on preferential low frequency sound enhancement and sound producing device characteristics.