Directivity of Acoustic Transmitters and Receivers definition of Directivity of Acoustic Transmitters and Receivers in the Free Online Encyclopedia.

Directivity of Acoustic Transmitters and Receivers

the ability to transmit (or receive) sound waves more strongly in some directions than in others. For the case of transmission, the directivity is determined by the interference of coherent sound vibrations that arrive at some point of the medium from individual sections of the transmitter that are small in comparison with the wavelength in the medium. For the case of reception, directivity is caused by the interference of pressures on the surface of the receiver.

Figure 1. Typical form of directivity characteristics of acoustic transmitter

The directivity of acoustic transmitters and receivers is usually described by (1) the directivity characteristics, the ratio of the sound pressure in particular directions to the sound pressure in the direction of maximum radiation, represented as a function of direction, and (2) the directivity factor K, which is the ratio of the intensity of the radiation generated by a given transmitter in the direction of maximum radiation to the intensity of a nondirectional transmitter that has the same power and is at the same distance. Directivity characteristics are usually represented in a polar diagram for some section of a plane passing through the direction of maximum radiation (see Figure 1).

Mentioned in	?		Encyclopedia browser	?		Full browser	?
No references found			directional gyro Directional Gyroscope directional homing directional hydrophone directional lighting directional log directional microphone directional pattern directional phase shifter directional property directional relay directional response pattern directional separation filter Directional Signal directional solidification directional stability directional structure directional well directive directive feed directive gain directive therapy directivity Directivity Factor directivity index Directivity of Acoustic Transmitters and Receivers Directivity Pattern directly congruent figures Directly Executable Test Oriented Language directly heated cathode Directness, Continuity, and Oral Nature of Judicial Examination Directoire style director director circle Director-class switch director-sight system director-type computer director-type fire control directorate Directorate of Public Schools directories Directory Directory Access Protocol directory board directory harvest attack directory listings directory management directory path directory server directory service Directory System Agent			Directive on Traditional Herbal Medicinal Products Directive Principles of State Policy Directive Produits de Construction Directive Relative a la Performance Énergétique des Bâtiments directive splint directive splint directive splint Directive sur les Eaux Résiduaires Urbaines Directive Technology Integrators directive therapy directive therapy Directive to Apprehend Directive-Type Memorandum Directive/Procedure directiveness Directives Directives Directives Directives Directives Documentation Directives et Ordonnances Administratives de la Defense Directives Maintenance Team Directives Management Directives Points of Contact Directives, Publications and Reports Index directivity directivity directivity factor Directivity Fractional Bandwidth directivity index Directivity of Acoustic Transmitters and Receivers Directivity pattern Directivity pattern Directline for Business Directlink Joint Venture directly directly Directly Above the Centre of the Earth directly administered antiretroviral therapy directly affected by the outcome of a controversy directly after Directly Attributable Incremental Cost Directly Authorised Intermediary Firms Directly Binary Coded Current Source directly congruent figures Directly Connected Impervious Area Directly Earthed Appliances Directly Embedded Heating System Directly Executable Representation Directly Executable Test Oriented Language Directly Executable Test Oriented Language directly heated cathode Directly Heated Triode Directly Interpretable Representation Directly Modulated Lasers Directly Molded directly observed preventive therapy Directly observed therapy Directly observed therapy