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Guide To Noise Cancelling And bhi DSP Solutions
DSP, or Digital Signal Processing, is the processing of signals by digital means. A digital signal consists of a stream of numbers in binary form, and the processing of the signal is done by performing numerical calculations. DSP can mean Digital Signal Processing or Digital Signal Processor, a specialised type of microprocessor chip, as used in our bhi DSP noise cancelling products. The development of digital signal processing dates from the 1960s because of the introduction of large mainframe computers used for big number-crunching applications, although DSP techniques were not widely used at this time because suitable computing equipment was only available in universities and scientific research institutions. The introduction of microprocessors in the late 1970s & early 1980s made it possible for DSP techniques to be used in a much wider range of applications. Manufacturers such as Texas Instruments, Analogue Devices, and Motorola developed Digital Signal Processor chips.
In signal processing, the function of a filter is to remove unwanted parts of the signal, such as random noise, or to extract useful parts of the signal, such as the components lying within a certain frequency range. There are two main kinds of filters, analogue and digital, and they are quite different in their physical makeup and how they work.
Noise cancelling has revolutionised how we experience speech and sound, from headphones to professional audio equipment. In this guide, we’ll explore what noise cancelling is, the difference between the types of noise cancelling, how it works, its various types, and the unique advantages offered by bhi’s advanced DSP noise cancelling technology.
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What is noise cancellation?
Noise cancelling is a technology designed to reduce or eliminate unwanted ambient sounds so that you can enjoy the listening experience more. Noise cancellation works by using various techniques to counteract external noise, creating a more focused and immersive listening experience. It is commonly used in headphones, speakers, and communication devices to improve sound clarity and reduce distractions.
The primary purpose of noise cancelling is to enhance audio quality in noisy environments. Whether you're commuting, working in a bustling office, or enjoying music at home, noise cancelling helps isolate the sounds you want to hear from those you don't. This technology has evolved significantly over the years, becoming a staple in both consumer and professional audio equipment.
Different types of noise cancelling technology
There are two main types of noise cancelling: passive and active. Passive noise cancelling involves physical barriers, such as ear cups or soundproof materials, to block external sounds. These methods are effective for high-frequency noise but may struggle with low-frequency sounds like engine hums.
Active noise cancelling (ANC) uses microphones, processors, and speakers to actively counteract noise. (ANC) Noise cancelling technology works by capturing ambient noise using microphones and generating sound waves that are the exact opposite (anti-phase) of the unwanted noise. This process, known as destructive interference, effectively cancels out the external sounds before they reach your ears.
Practical applications of noise cancelling technology are diverse. From improving call clarity in business settings to enhancing the audio experience during flights, the technology is integrated into various devices like headphones, microphones, and intercom systems. Modern innovations have also made noise cancellation accessible in compact and portable formats, such as earbuds and in-line modules.
Introduction to DSP noise cancellation
bhi’s Digital Signal Processing (DSP) noise cancelling technology delivers exceptional sound clarity. Unlike traditional systems, bhi's DSP solutions analyse and process audio signals in real time. This ensures that speech and desired sounds remain clear while unwanted background noise is effectively removed.
bhi offers a range of DSP noise cancelling products, including in-line modules and standalone speakers. Our products cater to various markets, from amateur radio to marine communication, providing users with reliable and high-quality noise cancelling solutions.
What makes bhi DSP noise cancelling unique?
The bhi noise cancelling system operates in the frequency domain and recognises human speech. The typical range of human voice modulation is around 0.6 to 6Hz. The pass-band of the DSP technology is subdivided into sub-bands, and the system works out whether the signal has speech or noise characteristics in the sub-band. If the signal has noise characteristics, the noise portion is removed from this sub-band. The speech then passes through with the noise removed (depending on the filter level setting). If no noise is present, the speech remains unchanged (try it with a clear FM signal). A technique called "spectral diffusion" is used to avoid the phenomenon of "musical tones" that you often find with other DSP technologies for most filter settings. There is almost no distortion of speech signals, even for very low signal-to-noise ratios of 0dB. The bhi DSP technology is self-adapting to a changing noise environment, and no training of the noise filter is required. Customers can adjust the DSP filter level to suit their own needs and applications. When doing this, it does not change the characteristics of the noise; that is, any residual noise still sounds natural.
Another unique feature is the emphasis on speech clarity. By prioritising vocal frequencies, our noise cancellation technology ensures that conversations remain intelligible even in noisy settings.
Benefit of bhi DSP noise cancelling
Choosing bhi's DSP noise cancelling solutions offers numerous advantages:
- Enhanced audio clarity in noisy environments.
- Durable, user-friendly designs.
- Applications across industries, from commercial radios to aviation.
Applications of noise cancelling technology
bhi’s DSP noise cancelling technology is used in a variety of industries. In the marine sector, it enhances communication clarity for ship-to-ship and ship-to-shore transmissions. In aviation, it reduces cockpit noise, ensuring clear communication between pilots and air traffic control.
The technology is also popular in the amateur radio community, where it helps operators reduce background noise during transmissions. Additionally, our solutions are used in medical and commercial settings to improve audio clarity and ensure effective communication in challenging environments.
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Noise cancellation technology has revolutionised the way we experience sound, whether through headphones, earbuds, or specialised devices. If you're ready to experience how noise cancellation works and enjoy the best in audio quality, shop our range of products, including noise cancelling headphones, in-line modules, speakers and intercoms.