DYNAS (from ''Dynamic Selectivity'') is a dynamic

analog filter Analogue filters are a basic building block of signal processing much used in electronics. Amongst their many applications are the separation of an audio signal before application to bass, mid-range, and tweeter loudspeakers; the combining and ...

ing and

tuning Tuning can refer to: Common uses * Tuning, the process of tuning a tuned amplifier or other electronic component * Musical tuning, musical systems of tuning, and the act of tuning an instrument or voice ** Guitar tunings ** Piano tuning, adjusting ...

technology to improve the reception of FM

radio broadcast Radio broadcasting is transmission of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio ...

s 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 Berlin ( , ) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constitue ...

, Hansen left Bosch/

Blaupunkt Blaupunkt GmbH () was a German manufacturer of mostly car audio equipment. It was owned by Robert Bosch GmbH from 1933 until 1 March 2009, when it was sold to Aurelius AG of Germany. It filed for bankruptcy in late 2015 with liquidation proceed ...

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 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" app ...

and

DASA ''Dasa'' ( sa, दास, Dāsa) is a Sanskrit word found in ancient Indian texts such as the ''Rigveda'' and ''Arthasastra''. It usually means "enemy" or "servant" but ''dasa'', or ''das'', also means a "servant of God", "devotee," "votary" or "o ...

, 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 (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 Bandwidth commonly refers to: * Bandwidth (signal processing) or ''analog bandwidth'', ''frequency bandwidth'', or ''radio bandwidth'', a measure of the width of a frequency range * Bandwidth (computing), the rate of data transfer, bit rate or thr ...

of the IF filter and by dynamically tracking of the

center frequency In electrical engineering and telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies. It is usually defined as either the arithmetic mean or the geometr ...

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

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 , commonly stylized as SONY, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. As a major technology company, it operates as one of the world's largest manufacturers of consumer and professional ...

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", 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 for further processing of the signal in the

DSP DSP may refer to: Computing * Digital signal processing, the mathematical manipulation of an information signal * Digital signal processor, a microprocessor designed for digital signal processing * Yamaha DSP-1, a proprietary digital signal ...

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