TestHiFi measures several industry standard criteria to check the HiFi capability of an audio system or to check the HiFi capability of audio at a listening position. TestHiFi measurement results sometimes provide indications where criteria for HiFi are not met. The following sections describe the criteria, what they mean for the listening experience and also if and how issues can be fixed. The section is divided into the following two main areas, in accordance with the measurements in TestHiFi.

• Flaws in audio systems
• Flaws in audio at listening position

FLAWS IN AUDIO SYSTEMS

Flaws in audio systems provides a description on what flaws an audio system itself might have. Flaws are theoretically explained, including a description on how TestHiFi measures them. Further more there are explanations how those flaws effect the listening experience and what actions can be taken to prevent for those flaws.

1. Flaws in audio systems – frequency_response_amplitude_drop
2. Flaws in audio systems – frequency response amplitude peak
3. Flaws in audio systems – loudness at harmonic distortion limit
4. Flaws in audio systems – loudness at intermodulation distortion limit
5. Flaws in audio systems – aurally weighted intermodulation disconsonance
6. Flaws in audio systems – stereo capability

 

FLAWS IN AUDIO AT LISTENING POSITION

Flaws in audio at listening position provides a description on what flaws can appear within the received audio at listening position, i.e. what can be heard at listening position. Flaws are theoretically explained, including a description on how TestHiFi measures them. Further more there are explanations how those flaws effect the listening experience and what actions can be taken to prevent for those flaws.

1. Flaws in audio at listening position – frequency response
2. Flaws in audio at listening position – frequency response channel correlation
3. Flaws in audio at listening position – transmission signal elongation
4. Flaws in audio at listening position – frequency group time coherence
5. Flaws in audio at listening position – stereo channel time coherence
6. Flaws in audio at listening position – phase coherence or polarity variation