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Infra bassRelated Patent Categories: Electrical Audio Signal Processing Systems And Devices, Including Frequency ControlInfra bass description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050281416, Infra bass. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation of U.S. patent application Ser. No. 09/841,958, filed Apr. 25, 2001. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a bandwidth extension device comprising an input for receiving an input signal, filter means for filtering the input signal, creating means for creating an adapted signal with a lower frequency part than the input signal. [0004] The invention further relates to an audio reproduction system comprising such a bandwidth extension device. [0005] 2. Description of the Related Art [0006] Such a device is known from European Patent Application No. EP-A-0240286, corresponding to U.S. Pat. No. 4,790,014. To improve the aural sensation in low-pitched (that is: signals in the very low frequency band) sound reproduction by an audio reproduction system or the like, a sub-harmonics generator is used to create this low-pitched signal. In this way, a lower pitch signal is created than is present in the incoming signal. [0007] A disadvantage of the known sub-harmonics generator and the known bandwidth extension device is that the amplitude of the sub-harmonics generator is not linear with the input voltage. Known sub-harmonics generators usually clip the input signal and then divide the signal by two, for example, with a flip-flop, also, for example, a phase-locked loop is used to obtain the sub-harmonics. SUMMARY OF THE INVENTION [0008] It is an object of the invention to improve such a bandwidth extension device and to obtain such a bandwidth extension device, which is simpler. To this end a first aspect of the invention provides a bandwidth extension system as described above, characterized in that the bandwidth extension device comprises at least a first and a second signal path each having filter means and creating means for creating a first and a second adapted signal, analyze means for comparing the first and second adapted signal with the input signal, and summing and weighting means for selecting the adapted signal which corresponds most with the input signal. In this way, a bandwidth extension system is obtained which supplies a low-pitched signal part with an amplitude proportional with the original signal. [0009] Further, the created sub-harmonics have no discontinuities as opposed to the sub-harmonics of the prior art bandwidth extension device which have discontinuities. BRIEF DESCRIPTION OF THE DRAWINGS [0010] The invention and additional features, which may optionally be used to implement the invention to advantage, will be apparent from and elucidated with reference to the examples described below and hereinafter and shown in the figures, in which: [0011] FIG. 1 shows an example of a bandwidth extension device according to the invention; [0012] FIG. 2 shows first diagrams of the harmonics streams of a signal in the frequency domain; [0013] FIG. 3 shows second diagrams of harmonics streams of a signal in the frequency domain; [0014] FIG. 4 shows a second example of a bandwidth extension device according to the invention; [0015] FIG. 5 shows a third example of a bandwidth extension device according to the invention; and [0016] FIG. 6 shows an example of an audio reproduction system according to the invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS [0017] FIG. 1 shows an example of a bandwidth extension device BD according to the invention. On an input I, the bandwidth extension device receives an input signal, for example, an audio signal. The input I is coupled to a first and a second band-pass filter BPF11 and BPF12, respectively. These band-pass filter form two band-limited parts from the (narrow-band) input signal, for example, one of 300-600 Hz (BPF11) and one of 300-450 Hz (BPF12). [0018] The output of the band-pass filter BPF11 is coupled to a harmonics generator HG1 and the output of the band-pass filter BPF12 is coupled to a harmonics generator HG2. [0019] The two harmonics generators HG1 and HG2 respectively produce two separate streams of harmonics of the selected frequency bands. Frequency components in the first band will be extracted as if the lowest harmonic in the narrow-band signal is the second harmonic, frequency components in the second band will be extracted as if the lowest harmonic in the narrow-band signal is the third harmonic, in this example. Continue reading about Infra bass... Full patent description for Infra bass Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Infra bass patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Infra bass or other areas of interest. ### Previous Patent Application: Microphone array processing system for noisy multipath environments Next Patent Application: Media device Industry Class: Electrical audio signal processing systems and devices ### FreshPatents.com Support Thank you for viewing the Infra bass patent info. 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