Side by Side: Apps for Field Contribution
Sending audio from the field back to the studio has evolved from leased lines and RPUs to ISDN and now to IP. At the same time, the power of the handheld devices we carry has been put to good use in radio as well. There are many apps to record quality audio from the field. There are also hardware add-ons to improve the recording functions. But there's another use for that smartphone when you need to get audio back to the studio.
A typical telephone call is still the simplest method to deliver audio, and with so many people carrying phones, it's easy to connect from anywhere. But a standard phone call is limited in audio bandwidth, and is hardly comparable to the high-quality audio available through other means. Bad audio is bad radio.
So why not take advantage of the digital connection of the smartphone to deliver better audio via 3G, 4G or Wi-fi? That's what some apps now do.
Using Session Initiation Protocol (SIP), a handheld device app can communicate with another device, like an IP codec at the station. The app connects to the receiver's IP address. The EBU working group for Network Audio Contribution Over IP (N/ACIP) adopted SIP for codec interoperability and included it in the Tech 3326 standard. Devices can connect directly or through a proxy server.
The handheld apps provide a signal path with a higher bandwidth than a typical POTS telephone call. The ubiquitous G.722 encoding provides a 7kHz connection, and other encoding algorithms provide quality up to 15kHz.
Some apps can also record audio for later transmission, which adds to their flexibility.
|Minimum Coding Delay at 24kb/s|
|Maximum Live Audio Quality @ 24kb/s|
|Maximum Recorded Audio Quality|
|Audio Sample Rate|
|Audio Recording Formats|
|Auto FTP on disconnect|
|Integration with automation systems|
Acceptable Use Policy blog comments powered by Disqus
[an error occurred while processing this directive]
Today in Radio History
The history of radio broadcasting extends beyond the work of a few famous inventors.
Read each issue online in our Digital Edition Format in your Web browser.
EAS Information More on EAS
The feed provides feeds for all US states and territories.
Need a calendar for your computer desktop? Use one of ours.
Information from manufacturers and associations about industry news, products, technology and business announcements.
Browse Back Issues[an error occurred while processing this directive]
Also in the March Issue
- The "And More" of Automation
- FCC Enforcement Items to Watch
- Testing AM Antennas
- New Products
- Field Report: Cloud Microphones Cloudlifter CL-1
- New Products at the 2014 NAB Show
- Side by Side: IP Codecs