DYNAS (from ''Dynamic Selectivity'') is a dynamic analog filtering and tuning technology to improve the reception of FM radio broadcasts under adverse conditions.

Overview

The trademarked DYNAS system is based on the same principles as the ''In Channel Select'' (''ICS'') system by H.u.C. Elektronik. The novel tracking filter arrangement was originally conceived by the German engineer Jens Hansen in 1982. The concept was prototyped as ''High Select'' in summer 1983. With funding from innovation funds of the city of Berlin, Hansen left Bosch/ Blaupunkt to start, with companion Klaus Müller-Catito, his own company H.u.C. Elektronik in 1984. When licensing negotiations with his former employer failed, the system was marketed in the early 1990s as DYNAS by the German

Telefunken electronic Telefunken was a German radio and television apparatus company, founded in Berlin in 1903, as a joint venture of Siemens & Halske and the '' Allgemeine Elektrizitäts-Gesellschaft'' (AEG) ('General electricity company'). The name "Telefunken" ap ...

(a spin-off of

AEG Allgemeine Elektricitäts-Gesellschaft AG (AEG; ) was a German producer of electrical equipment founded in Berlin as the ''Deutsche Edison-Gesellschaft für angewandte Elektricität'' in 1883 by Emil Rathenau. During the Second World War, AEG ...

- Telefunken and DASA, firming as since 1992), who, with the related (the former AEG-Telefunken Halbleiterwerk in

Heilbronn Heilbronn () is a List of cities and towns in Germany, city in northern Baden-Württemberg, Germany, surrounded by Heilbronn (district), Heilbronn District. With over 126,000 residents, it is the sixth-largest city in the state. From the late Mid ...

), also designed integrated circuits implementing the system, the TEMIC/TFK U4290B (stand-alone FM IF DYNAS system in 68-pin PLCC package), U4291B (DYNAS coprocessor) and U4292B (software-controlled DYNAS system in 44-pin SSO package). Compared to conventional receivers, DYNAS has a more than 26 dB better

selectivity Selectivity may refer to: Psychology and behaviour * Choice, making a selection among options * Discrimination, the ability to recognize differences * Socioemotional selectivity theory, in social psychology Engineering * Selectivity (radio), a ...

and a typically twice as good

sensitivity Sensitivity may refer to: Science and technology Natural sciences * Sensitivity (physiology), the ability of an organism or organ to respond to external stimuli ** Sensory processing sensitivity in humans * Sensitivity and specificity, statisti ...

(improved by 6 dB) thereby almost doubling the reception area and allowing to receive even extremely noisy stations. This is achieved by an adaptive bandwidth of the IF filter and by dynamically tracking of the center frequency of the IF filter in real-time. With a transmitter spacing of 200 kHz an undisturbed reception in

stereo Stereophonic sound, or more commonly stereo, is a method of sound reproduction that recreates a multi-directional, 3-dimensional audible perspective. This is usually achieved by using two independent audio channels through a configuration ...

is possible, with 100 kHz a largely undisturbed

mono Mono may refer to: Common meanings * Infectious mononucleosis, "the kissing disease" * Monaural, monophonic sound reproduction, often shortened to mono * Mono-, a numerical prefix representing anything single Music Performers * Mono (Japanese b ...

reception is still possible. The principle has been adopted in some high-end FM tuners like the analog Burmester Tuner 915 (1991) or the digital

synthesizer A synthesizer (also spelled synthesiser) is an electronic musical instrument that generates audio signals. Synthesizers typically create sounds by generating waveforms through methods including subtractive synthesis, additive synthesis and ...

tuners

Onkyo is a Japanese consumer electronics company, specializing in premium home cinema and audio equipment, including AV receivers, surround sound speakers and portable devices. The word ''Onkyo'' translates as "sound resonance". ''On'' () is from ...

Integra T-4970 (1992) and T-488F (1993) as well as in various

car radio Vehicle audio is equipment installed in a car or other vehicle to provide in-car entertainment and information for the vehicle occupants. Until the 1950s it consisted of a simple AM radio. Additions since then have included FM radio (1952), 8-t ...

s, such as the

Alpine Alpine may refer to any mountainous region. It may also refer to: Places Europe * Alps, a European mountain range ** Alpine states, which overlap with the European range Australia * Alpine, New South Wales, a Northern Village * Alpine National Pa ...

7619R (1989) and 1310R/3681 (1990), the

JVC JVC (short for Japan Victor Company) is a Japanese brand owned by JVCKenwood corporation. Founded in 1927 as the Victor Talking Machine Company of Japan and later as , the company is best known for introducing Japan's first televisions and for ...

KS-CG10 (1992), the

Clarion Clarion may refer to: Music * Clarion (instrument), a type of trumpet used in the Middle Ages * The register of a clarinet that ranges from B4 to C6 * A trumpet organ stop that usually plays an octave above unison pitch * "Clarion" (song), a 2 ...

CRX121R (1993), CRX123R (1993), CRX121RM and CRX123RM, the Gelhard GXR 990S (1993) or the

Conrad Conrad may refer to: People * Conrad (name) Places United States * Conrad, Illinois, an unincorporated community * Conrad, Indiana, an unincorporated community * Conrad, Iowa, a city * Conrad, Montana, a city * Conrad Glacier, Washington ...

Soundcraft Soundcraft is a British designer and importer (formerly a manufacturer) of mixing consoles and other professional audio equipment. It is a subsidiary of Harman International Industries, which is owned by South Korean company Samsung Electronics. ...

AR6800 DYNAS, which are particularly affected by difficult and rapidly changing reception conditions.

Similar technologies

The In Channel Select (ICS) system by H.u.C. Elektronik in 1984 is a DYNAS predecessor mainly for narrowband FM receivers. It is based on the High Select tracking filter (German: aka ) developed by Jens Hansen since 1982. ICS improved the selectivity by about 20 dB and the sensitivity by about 6 dB. A very similar technology is the Active Real-time Tracing System (ARTS), as was implemented in the

Pioneer Pioneer commonly refers to a settler who migrates to previously uninhabited or sparsely inhabited land. In the United States pioneer commonly refers to an American pioneer, a person in American history who migrated west to join in settling and dev ...

Elite F-91 and some versions of the F-717 high-end tuners in 1987. Super Sound Tracing (SST) is a similar technology by Sony affecting the RF rather than the IF stage. A four-stage SST system was implemented in high-end tuners such as the ST-S555ESX (1986), ST-S333ESX (1986), ST-S444ESX/ST-S700ES (1987), ST-S800ES (1987) and ST-S333ESX II (1987)/ST-S730ES (1988). Advanced SST, dividing the tuning range into 32 sections, was implemented in some model variants of the ST-S739ES, ST-S333ESG (1989)/ST-S770ES (1990) ST-S333ESA (1991), ST-S333ESJ (1993), ST-S707ES (1993) and ST-SA5ES (1994/1996). Blaupunkt's Sharx technology, as introduced in 1997 in the Modena & Lausanne RD 148 car radios with "

DigiCeiver Software-defined radio (SDR) is a radio communication system where components that have been traditionally implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented ...

", is a similar digital solution implemented in software. The original Sharx implementation still relied on a bank of switchable analog

ceramic resonator A Ceramic Resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or more metal electrodes attached. When connected in an electronic oscillator circuit, resonant mechanical vibrations in the device ge ...

s for the IF filter stage before the

A/D conversion In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal. An ADC may also provide ...

for further processing of the signal in the DSP section. Around 2000, the switchable IF filter moved into the digital domain as well, that is, it was integrated into the DigiCeiver/TwinCeiver chip leaving only the first stage of the IF filter a discrete part.

Overview

Similar technologies

See also

Notes

References

Further reading