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  TUNE - Product Description
TUNE - Product Description
Radio Frequency (RF) recording equipment is used by e.g. the manufacturers of radio broadcast receivers in order to record a given RF signal under dynamic (disturbed signal; test drives on public roads) and under static conditions (undisturbed reference signal). These RF recordings are then applied to different radio broadcast receivers and guarantee absolutely realistic and reproducible test conditions.
Up to now, the audio evaluation usually had to be done manually by expert listeners under laboratory conditions, often even requiring real test drives involving several test persons in a car. With the HEAD acoustics Radio Analyzer Tool TUNE, this evaluation can now be conducted for various sound environment scenarios (e.g. different car cabins) in a fast and easy but yet reliable, reproducible and objective manner.
TUNE is based on extensive auditory tests with far more than 2000 individual quality ratings of license-free speech and music samples in realistic environments (incl. the acoustics of car cabins). TUNE detects typical signal impairments and gives a statistic overview of their occurrence over time, thus allowing an objective comparison of the performance of different receivers.
Moreover, TUNE’s hearing-adequate analytical model is capable to analyze the processed audio output of receivers while considering human perception of typical disturbances, providing results with high correlation.
The disturbances can be divided into the following parts:
Typical disturbances for varying HF conditions:
- „Pops“: short-time noise bursts (RF multipath effects)
- Noise: constant additive noise (low overall signal level)
- Switching/transition from stereo to mono (low SNR in stereo carrier)
Typical artifacts resulting from the receiver’s attempt to mask disturbances:
- „High cuts“: Insertion of temporal low pass to avoid or at least lower the disturbances caused by audible pops
- Mute: Signal on both channels is muted to avoid audible noise
Note: TUNE conducts a reference-based analysis, thus the corresponding RF recording hardware as well as audio recordings and audio reference files must be provided by the user.
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