T+A Elektroakustik CC 820 M Technical description Dolby noise reduction system, Dolby B NR

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Technical description

DOLBY noise reduction system

The DOLBY noise reduction system substantially reduces the tape noise (background hiss) which occurs when a signal is recorded onto magnetic tape.

Tape hiss consists of signals at several frequencies, mainly in the high and medium ranges, and is particularly disturbing when quiet passages are reproduced.

When the DOLBY noise reduction system is in use, the recording level of low-volume medium and high frequencies is raised during the recording process.

During playback these signals are reduced by an equal amount. As a result the reproduced signal is identical to the original source signal, but the level of background hiss produced by the tape itself is reduced substantially.

The most popular noise reduction system is DOLBY B NR (NR = Noise Reduction).

The DOLBY C NR noise reduction system is a newer, significantly improved variant of DOLBY B NR.

DOLBY C NR works on a similar principle to that of DOLBY B NR, differing only in the characteristic curves of the encoding and decoding processes.

Whereas DOLBY B NR can reduce hiss by about 10 dB, DOLBY C NR can achieve a noise reduction of about 20 dB.

This figure represents a three-fold improvement over

DOLBY B NR.

DOLBY C NR also includes an anti-overload circuit and features controlled high frequency fall-off (spectral skewing).

These circuits provide a considerable improvement in the dynamic range of the medium and high frequencies

Note:

The DOLBY B/C noise reduction system only works correctly if the same noise reduction system is selected for recording and for playback.

If noise reduction is used for recording or playback only, then the sound will have an unnatural quality.

The same applies if one noise reduction system is used for recording and a different one for playback.

The CC 820 M features the DOLBY HX PRO headroom extension. This system is applied automatically during the recording process, and does not have to be switched on manually.

The HX PRO system works with all types of tape (normal, CrO2 and metal tape).

The DOLBY HX PRO headroom extension works by raising the tape saturation level in the high frequency range when a tape recording is made. The result is that virtually all the high frequency signals, which are often distorted or lost entirely with a conventional cassette recorder, are reproduced faithfully by the CC 820 M.

No decoding process is required when a tape recorded using DOLBY HX PRO is played back, with the result that the improvement in sound brought about by this system is apparent when the tape is played back on other devices (portable cassette recorders or in-car stereo systems).

HX PRO functions independently of the DOLBY B/C noise reduction systems, and works whether they are switched on or off.

Manufactured under licence to Dolby Laboratories.

HX Pro headroom expansion is based on a Bang und Olufsen development.

„Dolby“, „HX Pro“ and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.

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Contents Betriebsanleitung Page Deutsch Seite /Willkommen  elektroakustik GmbH & Co KGInstallation Inbetriebnahme Sicherheitshinweise InhaltsverzeichnisBedienung Technische BeschreibungBedienelemente der Frontseite Cassetten-Schublade /  /  B / a  B / CMultifunktions-Display im PT 820 M HauptanzeigeAussteuerungsanzeige Anzeige für Aufnahmemodus und Band- richtungBedienung des CC 820 M Einlegen einer CassetteWiedergabe starten Beenden der WiedergabeFernbedienung des CC 820 M AllgemeinesAufnahme AufnahmevorbereitungBalance-Einstellung Aussteuern einer AufnahmeManuelle BIAS-Korrektur Grundeinstellungen AufnehmenAufnehmen mit Synchrostart Überspielen einer CD mit Synchro- FunktionAufnehmen mehrerer Stücke von unterschiedlichen CDs Schritte 1. bis 8. siehe nebenstehendRecorder Sonderfunktionen MenüsteuerungPLAY-Betriebsart Menüpunkt ErläuterungFilter / no Filter Menüpunkt Clear ATC Menüpunkt ErläuterungBegriffserläuterungen und Wissenswertes Bandsorten-Erkennung Technische Beschreibung Compact-CassettenAufnahme- und Löschsperre Technische Beschreibung DOLBY-Rauschunterdrückungssystem Installation Inbetriebnahme Sicherheitshinweise Die Anschlusselemente des CC 820 M  OutputVerkabelung Sicherheitshinweise Bestimmungsgemäßer GebrauchGerätezulassung und Konformität mit EG-Richtlinien Pflege des GerätesBetriebsstörungen No TapePage English Welcome Contents Front panel controls   /  /  B / aDisplay of Record mode and tape direction Multi-function screen on PT 820 MMain display Overload displayOperating the CC 820 M Inserting a cassetteStarting playback Ending playbackRemote control of the CC 820 M General informationRecording Preparing to make a recordingBalance adjustment Setting the recording levelManual Bias correction Basic settings Making the recordingRecording using Synchro-Start Transferring a CD to tape using the synchro-functionRecording several pieces from different CDs Steps 1. to 8. as abovePlay mode Menu point Introduction Special recorder functionsMenu control system OperationFilter / no Filter Menu point Clear ATC Menu point IntroductionExplanation of terms, useful information Tape type detection Technical description Compact-CassettesRecord / erase protect tabs Technical description Dolby noise reduction system Dolby B NRInstallation Using the unit for the first time Safety notes Connections to the CC 820 M Wiring Safety notes Approved usageApproval and conformity with EC directives Care of the unitClass B digital device instructions FCC Information to the userFor use in the United States of America only Trouble shooting Technische Daten / Specification Allgemeines / General information elektroakustik GmbH & Co. KG

CC 820 M specifications

T+A Elektroakustik is a renowned German manufacturer known for its high-fidelity audio products, seamlessly merging innovation with craftsmanship. Among their impressive lineup, the T+A CC 820 M stands out as a versatile compact speaker system designed to deliver an exceptional audio experience.

One of the main features of the CC 820 M is its sophisticated design, which elegantly fits into any modern interior. The cabinet is made from high-quality materials to ensure minimal resonance, thus preserving sound integrity. This attention to detail in construction contributes to the speaker’s overall performance, offering clarity and richness across various audio styles, from classical music to contemporary pop.

At the heart of the CC 820 M is T+A's unique transducer technology. This speaker employs advanced drive units, including a precision-made woofer and a high-frequency driver, engineered to work harmoniously together. The combination allows the speaker to reproduce sound accurately across a wide frequency spectrum, resulting in vibrant bass and sparkling treble without any distortion.

The CC 820 M also integrates sophisticated digital signal processing (DSP) technology. This feature enhances the speaker’s adaptability to different room acoustics, ensuring optimal performance regardless of surroundings. With intelligent algorithms, the DSP can analyze audio signals and adjust them in real time, providing a tailored listening experience.

Another standout characteristic is the speaker's connectivity options. The CC 820 M is equipped with various inputs, including analog, digital optical, and USB ports, allowing seamless integration with a multitude of devices such as computers, televisions, and streaming services. This versatility provides users with the freedom to enjoy their favorite audio content in numerous ways.

Furthermore, the CC 820 M features energy-efficient engineering, which not only conserves power but also reduces environmental impact. Its sleek and modern interface, complete with user-friendly controls, adds to the overall appeal, making it suitable for both audiophiles and casual listeners alike.

In conclusion, the T+A Elektroakustik CC 820 M compact speaker combines elegant design, cutting-edge technology, and high-performance sound. With its sophisticated transducer system, advanced DSP capabilities, and diverse connectivity options, this speaker is crafted to elevate the listening experience, making it a noteworthy choice for discerning audio enthusiasts.
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