What is the frequency response of the North American Public Switched Telephone Network? June 3, 2009Posted by Paul Seibert in Telecommunications, VoIP, VUI Voice User Interface, Wireless Applications.
Tags: Frequency, Hearing range, Hertz, IVR, Public switched telephone network, Telecommunications, VoIP, VUI
The conventional North American Public Switched Telephone Network, or PSTN, has a frequency response range of 300 Hz to 3,400 Hz. The normal hearing range of humans is typically 30 Hz to 20,000 Hz. So the conventional telephone transmission system is unable to carry bright, high-frequency and deep, low-frequency tones.
But, somewhat surprisingly, because our ears are so used to hearing poor-quality audio over the telephone, our brains actually “fill in” the missing frequencies. As an example, the crisp “s” sound in the word “Christmas”. So in effect, the telephone audio often sounds better than it actually is to us.
More Articles From Boston’s Hub Tech Insider:
- Twelve Tips For Agile Project Planning and Estimating
- Eight ways to tell if your Project Team is on the Way Up, or on the Way Down
- The Twenty Laws of Testing Computer Software
- Why Designing for a VUI is harder than designing for a GUI
- The Hub Tech Insider Glossary of Mobile Web Terminology
- The Hub Tech Insider Glossary of Stock Options Terminology
- How many Stock Options should executives at a startup be granted?
- Agile Development In Practice
- What is ‘Management By Walking Around’?
- Boston Area Video Game Companies
- Demandware eCommerce
- How to expand your professional network on LinkedIn
- How to use LinkedIn in your job search
- Twitter and network effects
- How much bandwidth does a smartphone use? How much bandwidth does an Apple iPad use? How much bandwidth does an Apple iPhone use?
- What is Scrum?
- What is a “Use Case”?
- What is a “User Story”?
- What is Indirect Spend?
- What is EDIINT? What is AS2, AS1, AS3 and AS4?
- The History of Cell Phones (socyberty.com)