hi guys this is the classical design of the FM stereo encoder, i havent design the circuit. Figure 3: A block diagram of JMPX excluding the RDS part. Listing 1 shows pseudocode of the main routine of the code that produces the stereo signal. 2) There is not enough boost from the pre-emphasis at high audio frequencies because the lowpass filters have responses that are too gradual. This causes whistles in the output of the encoder.
Fm encoder stereo software#
Figure 3 shows a block diagram of the software excluding the RDS part, and figure 4 a block diagram of how the FM stereo encoder part works. 1) There is way too much audio level near 19kHz because the lowpass filters have responses that are too gradual. All the settings that are related to the FM signal can be found here, such as pre-emphasis, stereo and RDS encoding, RDS texts, Stokkemask (ITU-R SM.1268) and ITU-R BS.412 compliance and multipath distortion. All the settings to generate a compliant FM signal.
Fm encoder stereo full#
The broadcast audio processor section also has a full range of tools for 'stand-alone' use including world-renowned leve ler, plus effective presence and brightness enhancers to make sure your signal stands out. Blog entry posted in Uncategorised, December 28, 2012. For stereo there is also a pilot at 19 kHz. Back to overview Documentation version 9.23. All the usual limiting and clipping functions for peak control that you'd expect to find are there too, including fully overshoot compensated 15kHz lowpass filters. Multiband processors can be located at the studio for convenience while obtaining better peak control (and therefore more loudness) at one or many FM transmitter sites using ProCoder's 'transparent mode' with LF- and HF- overshoot inhibiting algorithms. The Audessence ProCoder-2 Audio Processor is a great value FM processor and stereo encoder that can save money whether your station is a big network keen to solve the dilemma of where to locate your favorite multiband audio processor or a smaller broadcaster looking to broadcast a loud signal without losing clarity and quality.