Noise Calc vs CallCentersBlock

Noise Calc is a calculator designed to quickly estimate noise levels in outdoor environments and semi-reverberant fields. It is a useful tool for acoustic technicians in the field, as well as for other professionals dealing with machine noise. We have specifically designed a section for those who design and install heat pumps, air handling units (AHUs), chillers, and other noisy outdoor machinery. The first section performs logarithmic summation in decibels: this is useful, for example, when multiple machines are nearby, and their known sound energy levels need to be summed (dB values must be added with dB, or dBA with dBA; sound power levels (Lw) can be summed together; sound pressure levels (Lp) can also be summed, but only if measured at the same distance from the source). The second section performs a logarithmic difference in decibels: this is useful when the ambient pressure level and residual pressure level are known, helping to determine the energy level of the sound source at a given point. The third section evaluates sound pressure attenuation with distance: if the pressure level (Lp) in decibels is known at distance d1, the result at d2 can be estimated (however, measurements taken with a phone should be avoided, and care must be taken to ensure that d1 is not too close to the source and that d2 is not affected by sound reflections). The fourth section evaluates sound propagation in free-field conditions, considering the sound power level (Lw) of the source and whether it is near one, two, or three surfaces (excluding reflections from other objects). The fifth section estimates the noise reduction effect of a sound-insulating barrier. It performs a simplified frequency-by-frequency calculation and returns the number of decibels by which the noise will be reduced (if the frequency is unknown, 500 Hz is typically used). The sixth section is particularly useful for technicians and installers of outdoor machinery. Given the data from the technical sheet (either power or pressure at the manufacturer-declared distance), the machine's position near one or more surfaces, and the distance to the nearest neighbor's window, the app will indicate whether there are significant issues in complying with municipal noise zoning regulations). The seventh section allows for a differential limit calculation. The eighth section evaluates sound propagation in a semi-reverberant field.

Call Centers Block stops the calls you keep getting from the same number ranges. You enter a prefix, for example 0584177, and iOS blocks every incoming call whose number starts with it. WHAT DECIDES WHAT GETS BLOCKED Only you. The app ships with no list of numbers and downloads none. The only blocking criteria are the prefixes you type in yourself, for the ranges that have actually been calling you. You can edit or delete any of them at any time. TWO MODES FOR EVERY PREFIX Block: matching calls never ring. Nothing interrupts you. Identify: matching calls still ring, but the call screen shows which prefix matched, so you decide whether to answer. HOW IT WORKS iOS never lets an app inspect a call while it is ringing. So the app expands each prefix on your iPhone into all the numbers it covers and hands that list to iOS through Apple's Call Directory system. From then on iOS filters the calls by itself, even when the app is closed. A seven digit prefix covers 11,111 numbers, and the app shows you exactly how many numbers a prefix covers before you add it. PRIVACY Nothing is collected, transmitted or shared. There is no account, no analytics, no advertising and no network connection at all. Your prefixes never leave your iPhone. The app never sees who is calling you, because iOS does the matching. WORTH KNOWING - iOS never blocks numbers saved in your Contacts, whatever prefix you add. - On recent versions of iOS, a number you have called yourself is not blocked until you delete that outgoing call from Recents. - WhatsApp, FaceTime and similar app calls do not go through the system call filter, so they are not affected. - A blocked call may still be listed in Recents as Blocked. It never rings. - A Diagnostics section shows when iOS last loaded your list and how many numbers it contains, so you can confirm it is working. Works with any country code. Numbers typed without a leading + are treated as numbers from the country you pick in Settings.