SYSTEM AND METHOD FOR DYNAMIC BASS FREQUENCY CONTROL

• US 20100158273A1
• Filed: 12/23/2008
• Published: 06/24/2010
• Est. Priority Date: 12/23/2008
• Status: Active Grant

• Current Assignee: Creative Technology Ltd.
• Original Assignee: Creative Technology Ltd.
• Inventors: CHEAH, Chee Sin, CHANG, Thean Kuie Christopher, KOH, Huoy Ru Rachel, DONG, Cunsheng Vincent
• Granted Patent: US 8,194,887 B2
• Time in Patent Office: Days
• US Class Current: 381/102
• CPC Class Codes: H03G 9/025 frequency-dependent volume compression or expansion, e.g. multiple-band systems H03G9/10, H03G9/18 take precedence

Abstract

A system and method for dynamic bass frequency control, the system comprising: a bandwidth filter coupled to a plurality of switchable electronic components for filtering a frequency range of an input signal; an amplifier coupled to the bandwidth filter and the plurality of switchable electronic components, the amplifier being configured for adjusting amplitude of the filtered frequency range of the input signal based on a configuration of the plurality of switchable electronic components; and a signal level detector coupled to the switchable electronic components for determining signal strength of the input signal, the signal level detector being configured to switch the plurality of switchable electronic components between more than one configuration based on the signal strength of the input signal, each configuration determining the frequency range of the input signal to be filtered by the bandwidth filter and the amplitude adjustment to be made to the filtered frequency range of the input signal by the amplifier.

Claims

1. A system for dynamic bass frequency control, the system comprising:

a bandwidth filter coupled to a plurality of switchable electronic components for filtering a frequency range of an input signal;

an amplifier coupled to the bandwidth filter and the plurality of switchable electronic components, the amplifier being configured for adjusting amplitude of the filtered frequency range of the input signal based on a configuration of the plurality of switchable electronic components; and

a signal level detector coupled to the switchable electronic components for determining signal strength of the input signal,

the signal level detector being configured to switch the plurality of switchable electronic components between more than one configuration based on the signal strength of the input signal, each configuration determining the frequency range of the input signal to be filtered by the bandwidth filter and the amplitude adjustment to be made to the filtered frequency range of the input signal by the amplifier.

2. The system as claimed in claim 1, the system further comprising:

a zero crossing detector coupled to the signal level detector for determining zero crossing points in the input signal and generating a zero crossing signal upon determining a zero crossing point, the signal level detector being configured to send a switching signal to switch the switchable electronic components between the more than one configuration based on the zero crossing signal.

3. The system as claimed in claim 2, the system further comprising:

a buffer device coupled to the zero crossing detector and the signal level detector, the buffer device being configured to store the switching signal and forward the stored switching signal to the switchable electronic components to switch the switchable electronic components between the more than one configuration upon receiving the zero crossing signal from the zero crossing detector.

4. The system as claimed in claim 1, wherein the amplifier is part of the bandwidth filter.

5. The system as claimed in claim 1, wherein the plurality of switchable electronic components comprises two or more separate capacitor banks, the banks comprising switches for connecting up one or more capacitors to form a configuration.

6. The system as claimed in claim 5, wherein at least one of the capacitor banks has a fixed capacitance value and the capacitance value of at least one of the capacitor banks can be varied.

7. The system as claimed in claim 1, wherein if the signal level detector determines that the input signal strength is above a threshold level, the plurality of switchable electronic components is switched to a configuration that configures the bandwidth filter to filter a bass frequency range of the input signal and configures the amplifier to attenuate the amplitude of the filtered bass frequency range of the input signal.

8. The system as claimed in claim 1, wherein if the signal level detector determines that the input signal strength is below a threshold level, the plurality of switchable electronic components is switched to a configuration that configures the bandwidth filter to filter a bass frequency range of the input signal and configures the amplifier to amplify the amplitude of the filtered bass frequency range of the input signal.

9. The system as claimed in claim 1, wherein switching resolution of the plurality of switchable electronic components between different configurations is progressively increased as the input signal is progressively increased.

10. A method for dynamic bass frequency control, the method comprising:

filtering a frequency range of an input signal;

adjusting amplitude of the filtered frequency range of the input signal;

determining signal strength of the input signal;

switching a plurality of switchable electronic components between more than one configuration based on the signal strength of the input signal; and

determining based on the configuration the frequency range of the input signal to filter and the amplitude adjustment to be made to the filtered frequency range of the input signal.

11. The method as claimed in claim 10, the method further comprising:

determining a zero crossing point in the input signal;

generating a zero crossing signal upon determining a zero crossing point; and

switching the plurality of switchable electronic components between the

more than one configuration based on the zero crossing signal.

12. The method as claimed in claim 11, the method further comprising:

storing a switching signal to switch the switchable electronic components between the more than one configuration; and

forwarding the stored switching signal to switch the switchable electronic components between the more than one configuration on receiving the zero crossing signal.

13. The method as claimed in claim 10, the method comprising:

switching the plurality of switchable electronic components to a configuration that causes the filtering of a bass frequency range of the input signal and attenuation of the amplitude of the filtered bass frequency range of the input signal if the input signal strength is determined to be above a threshold level.

14. The method as claimed in claim 10, the method comprising:

switching the plurality of switchable electronic components to a configuration that causes the filtering of a bass frequency range of the input signal and amplification of the amplitude of the filtered bass frequency range of the input signal if the input signal strength is determined to be below a threshold level.