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Harvard sentences. The Harvard sentences, or Harvard lines, [1] is a collection of 720 sample phrases, divided into lists of 10, used for standardized testing of Voice over IP, cellular, and other telephone systems. They are phonetically balanced sentences that use specific phonemes at the same frequency they appear in English.
Pink noise is commonly used to test the loudspeakers in sound reinforcement systems, with the resulting sound measured with a test microphone in the listening space connected to a spectrum analyzer [3] or a computer running a real-time fast Fourier transform (FFT) analyzer program such as Smaart.
An audio analyzer is a test and measurement instrument used to objectively quantify the audio performance of electronic and electro-acoustical devices. Audio quality metrics cover a wide variety of parameters, including level, gain, noise, harmonic and intermodulation distortion, frequency response, relative phase of signals, interchannel crosstalk, and more. In addition, many manufacturers ...
A pistonphone is an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones. The principle relies on a piston mechanically driven to move at a specified cyclic rate, pushing on a fixed volume of air to which the microphone under test is coupled.
A sound level meter (also called sound pressure level meter ( SPL )) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability. [1] The diaphragm of the microphone responds to ...
For listening tests comparing the perceived audio quality of audio formats and codecs, see the article Codec listening test. General information [ edit ] Audio compression format
A microphone, colloquially called a mic ( / maɪk / ), [1] or mike, [a] is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, and radio and ...
ORTF setup. The ORTF stereo technique, also known as side-other-side, is a microphone technique used to record stereo sound . It was devised around 1960 at the Office de Radiodiffusion Télévision Française (ORTF), currently Radio France . ORTF combines both the volume difference and the timing difference as sound arrives on- and off-axis at ...
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