Immittance

Immittance

Immittance in electrical and acoustical terminology is a concept combining the impedance and admittance of a system or circuit.

It is sometimes convenient to use the term immittance when referring to a complex number which may be either the impedance (ratio of voltage to current in electrical circuits, or sound pressure to volume velocity in acoustical systems) or the admittance (ratio of current to voltage, or volume velocity to sound pressure) of a system. In Audiology, tympanometry is sometimes called "immittance testing".

Immittance does not have units since it applies to both impedance and admittance, which have different units. However, in certain theoretical work it may be necessary to deal with general functions, which afterward will be specialised to become either an impedance or an admittance by the assignment of suitable units; in such cases it is convenient to refer to the functions as immittances.

In electronics, the "immittance" Smith chart simply has both the impedance and admittance grids on the same chart, which is useful for cascading series-connected with parallel-connected circuits. However, with so many lines, it can become difficult to read.

References


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Look at other dictionaries:

  • immittance — noun Etymology: impedance + admittance Date: circa 1948 electrical admittance or impedance …   New Collegiate Dictionary

  • immittance — /i mit ns/, n. Elect. impedance or admittance, used when the distinction between the two is not relevant. [1945 50; IM(PEDANCE) + (AD)MITTANCE] * * * …   Universalium

  • immittance — noun either the impedance or the admittance of an electrical network considered as alternatives …   Wiktionary

  • immittance — Measurement of middle ear impedance and compliance. SYN: admittance. [L. immitto, to send in] * * * im·mit·tance (ĭ mitґəns) [impedance + admittance] a term coined to express the effect of both admittance and impedance …   Medical dictionary

  • immittance — [ɪ mɪt(ə)ns] noun Physics admittance and impedance (as a combined concept) …   English new terms dictionary

  • immittance — im·mit·tance …   English syllables

  • immittance — n. Electr. admittance or impedance (when not distinguished). Etymology: impedance + ad mittance …   Useful english dictionary

  • acoustic immittance — measurement of energy flow through the middle ear by assessing acoustic admittance, acoustic impedance, or both …   Medical dictionary

  • Adel Sedra — is an Egyptian electrical engineer whose research specialization is microelectronics, with particular emphasis on applications in communication and instrumentation systems. He received his bachelor of science in electrical engineering from Cairo… …   Wikipedia

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