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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Showing posts with label D/A converter. Show all posts
Showing posts with label D/A converter. Show all posts

Philips LHH-1000 CD player

Philips Compact Disc Player LHH U00

The Philips Reference Series LHH 1000 is now the standard by which other compact disc players will be measured. Other companies may claim state-of-the-art technology but the world's most particular audiophiles-Philips engineers- have achieved it, designing a technological masterpiece that is as pure and complete as any Mozart sonata.

A limited edition - and in strictly limited quantities the Philips LHH 1000 says much about the people who designed the system and the discerning buyer. It says only the best will do ...only a level of excellence attained after years of dedication to achieving the finest musical reproduction possible.

 

Every component of the Philips LHH 1000 is hand chosen for maximum performance. At the heart of the separate digital-to-analog converter and digital filter are special Select Grade TDA-1541 "AS -1" chips with four times oversampling that realize a startling 15,75 bits of resolution from the 16 bits available in the compact disc format. The highest resolution yet achieved in compact disc. Linearity error and distortion barely register. In fact, ail specifications are where you would expect them to be-at the top of their class.

The separate transport section features the professional quality, broadcast standard Philips CDM-1 mechanism made of die cast aluminum alloy. An extremely accurate single beam laser pickup floats on a Radialinear swinging arm that improves tracking ability and offers faster track-to- track access times. And, of course, the LHH 1000 has the renowned Philips Favorite Track Selection (FTS) system to program your entire CD collection. Connections between the Reference Compact Disc Player System (DAC and transport) can be made with coaxial or optical fiber cable with diamond polished connectors. This ensures 100 percent error free transmission of digital data, resulting in truly lifelike, distortion -free sound. 

 

The utmost thought and care went into every aspect of the LHH 1000. There are no plastic parts anywhere in the chassis assembly. The elegant looks belie durable and rugged construction that is second to none.

A sophisticated Learning Type Universal remote control is capable of learning 150 functions from other remotes. LCD readouts complements the system to provide complete fingertip control of this state-of-the-art CD player.

There is no question: the Philips LHH 1000 has set the gold standard for CD technology. It is the finest compact disc player currently available, for people with no tolerance for imperfection.

 


Specifications

Frequency Response:  20 - 20,000 Hz ±0,1 dB

Phase Linearity:  ±0,2 degrees

Signal-to-Noise Ratio:  better than 101 dB

Dynamic Range:  better than 96 dB

Channel Separation:  better than 100 dB

Total Harmonic Distortion:  less than 0,015% at 1 kHz

Ultrasonic Noise Rejection:  better than 60 dB

Analog Output level:  2 V rms, typical 1 kHz, all bits on

Dimensions (W x H x D)

Transport LHH-1001 :  17-/8" x 4-1/8" x 13-5/8"

D/A Coverter LHH-1002 :  as above

Weight:  62 lbs (combined)

Remote Control :  RC-5 Compatible


 

Luxman DA-07 D/A converter

The Luxman DA-07 Digital/Analog Converter Unit
Features:
Fluency DAC conversion of digital  inputs with sampling frequencies of 44,1 kHz (CD), 48 kHz (DAT) and 32 kHz (Digital Satellite Broadcasting Tuner)
Complete isolation of left/right channel and digital/analog signal paths at all stages, including independent L/R power transformers
Ultra-high quality materials and components used throughout, including PC-OCC wiring and 70 µ-thick OFC glass epoxy PC boards
Independent voltage regulators at 11 stages
Massive anti-resonant rigid construction with 18 mm front panel
Full copper plated chassis and 10-block internal layout for maximum shielding
Switching of 3 coaxial, and 3 optical digital inputs (2 standard and 1 ultra high speed for use with DP-07)
Digital recording optical and coaxial outputs
3 analog outputs (variable coaxial, fixed coaxial, and fixed balanced)
Adjustable master output level
Front panel display dimmer/switch
Champagne gold finish
A conventional DAC design applying Shannon's Theorem and a digital oversampling filter results in ringing distortions. These can be seen in the small ripples on either side of the musical signal. Ringing results in constant low-level noise and a perceived decline in dynamic range. These spurious signal also cause phase distortions during listening, detracting from the subtle musical harmonics that make music come to life. The Fluency DAC virtually eliminates ringing. A similarly dramatic improvement in reproduction is seen inn the square wave test.
Restoring the full musical spectrum
The advantages of the Fluency DAC are not limited to the elimination of phase shift and ringing. By accurately selecting musical signals at the input stage, the Fluency DAC produces an analog signal with more musical depth. Almost all music sources naturally contain a small but significant harmonic component at the upper limits of audibility. This component is critical to the soundstage localization and musical "ambience" that are essential for realistic reproduction. However, digital recording for compact discs is a pulse-code modulation process using a sampling frequency of 44,1 kHz, which effectively eliminates all musical signal from about 22 kHz on up. Moreover, conventional DAC's employ a filter that begins a steep cut-off at lower frequencies.

Luxman found an ingenious way to restore this missing musical ambience using the Fluency DAC. Because harmonics arise from basic physical laws and mathematical principles, the distribution of harmonics that occur in nature can be recreated. By carefully programming the digital input stage of the Fluency DAC, Luxman has succeeded in reproducing the rich ambience lost in the CD recording and playback.

Specifications:
Method of D/A Conversion:  Fluency DAC, 16-bit, no LP filter
Sampling Frequencies:  32 kHz, 44,1 kHz, 48 kHz (automatic switching)
Frequency Response (CD Input):  4 Hz - 20 kHz (±0,1 dB)
Total Harmonic Distortion:  0,008%
Impulse Distortion (Impulse peak/sample peak):  approx. 0,4% (ref. 26% for DAC based on Shannon's Theorem)
s.n Ratio:  more than 115 dB
Digital Inputs Voltage:
Coaxial 1, 2, 3 :  0,5 Vp-p/75 Ω
Optical 1 :  125 Mb/s
Optical 2, 3 :  6 Mb/s
Digital Output Voltage
Coaxial:  2 V/74 Ω (fixed), -2 V/ 100 Ω (variable)
Balanced:  4 V/ 94 Ω (fixed)
Dimensions (W x H x D):  438 x 220 x 474 mm
Weight (net):  27 kg


Technics SV-100

 SV-100 Digital Audio processor, designed for use with a VCR, provides very high quality digital audio processing for digital audio recording and playback.  Not only is the SV-100 compact, it weighs only 2,9 kg (net) making it the world's lightest digital audio processor.
This means that the SV-100 is ideally suited for portable use, especially when combined with the matching Panasonic NV-100 VCR.  Its attractive styling also complements other high quality audio components when used in a home hi-fi system.
 Advanced Semiconductor Circuitry for Compact Size
Sophisticated original LSI and microprocessor technology contributes to this processor's surprisingly compact size and light weight. The PCM signal processing LSI (MN6601) contains about 10,000 elements in a 6,08 x 5,58 mm chip; the playback LSI (MN6602) has about 15,000 elements in a 6,46 x 6,18 mm chip; the recording/playback control LSI has about 6,000 elements in 4,48 x 3,62 mm chip.
Together, these tree LSIs are equivalent to about 320 logic Ics. Instead of the conventional separate A/D and D/A converters, a single AD/DA converter is used for conversion from analog to digital and vice versa.  This revolutionary circuitry also means more dependable performance.
 Designed for Quick Precise Control
For quick and accurate adjustment, the SV-100 has a master level control and a stereo balance control. This unusual system is actually the most practical for most purposes such as recording FM broadcasts or Compact Discs. In both cases it is easiest to adjust same time and no stereo balance adjustment is usually needed. The same goes for live recording where the left and right  channel microphones are normally matched. Furthermore, the less used controls are of the slide switch type, so there is little danger of accidental misoperation.

2-Color FL meters for Accurate Indication
In digital as in analog recording, accurate meters are essential for correct recording level setting. However, with digital audio, it is all the more important not to set recording level  too high. Therefore, the SV-100 is equipped with precision FL meters that extend all the way from -50 dB to +6 dB. Since clipping occours above 0 dB, this wide-range metering system lets you see exactly where you should set recording level to avoid distortion. Comparate this with other digital audio processors that give only an "over" indication if recording level is too high.
 Versatile Connection Facilities
The SV-100 has two complete sets of video input/output jacks, one set on the side and one on the rear panel. This lets you use the Sv-100 in a vertical or horizontal position. The matching Panasonic NV-100 VCR has similar connection facilities so that the two are ideally suited for portable use. Of course, the SV-100 can be used with virtually any home VCR (or ¾-inch U-matic type VCR).

Suplied AC power Unit with Handy Video/Audio Switch
TheS V-100i s ready to use right away since it comes with its own AC power unit for home use. This compact  unit is designed to simplify connections while supplying power to the SV-100. It also works as a battery charger for the optional battery packs available for  the SV-100 On the AC power unit's front panel is a "recording" switch that lets you use your VCR for recording TV programs or for PCM digital recording without having to change any connections
 VCR Tracking Check and Battery Check Functions
A front panel slide switch lets you change the display from recording/playback level indication to VCR tracking and battery check indication. The VCR tracking readout tells you how well the video tape recorder's heads are tracking the recorded tracks during playback. You can then adjust the VCR to obtain optimum playback quality. This is particularly important if the tape is being played back on a different VCR from that used for recording. The battery check readout tells you how full the battery is and whether it needs charging.
Other Valuable Features
Built-in high quality mic amp.
Digital copy  output jack.
Mute cancel switch lets you hear sound in VCR's cue and review modes.
Headphone volume control.
Playback mode switch for optimum matching with VCR signal characteristics.
Rec mute switch
Specifications
Type:  Digital audio processor
PCM Standard:  FILE -- STC-008
Quantization:  Linear 14-bit
Decoding:  Linear 14-bit
Recording Time:  Max. 3 hours (when using the NV-E180 video cassette tape)
Channels:  2 (L, R)
Frequency Response:  2Hz - 20kHz (± 0.5 dB)
Harmonic  Distortion:  Less than 0,01% (1 kHz, 0 dB)
Dynamic Range:  More than 86 dB
Input Sensitivity/Impedance: 
Line :  30 mV (-15 dB) / 50 k Ω
Microphone :  0,7 mV (-15 dB) / 600 Ω
Video :  1 Vp-p / 75 Ω (Video format)
Output Level/Impedance: 
Line :  400 mV (-15 dB) / 600 Ω
Video :  1 Vp-p / 75 Ω (Video format)
Digital Copy :  1 Vp-p / 75 Ω
ACCESSORY FUNCTIONS
VCR tracking check, Battery check,
VCR playback mode switch (to match VCR characteristics) auto/off  playback muting  switch, Rec mute  switch, Playback (recording) mode indicator, Headphone volume control, Supplied AC power unit has battery charging and video/digital audio switching functions.
General
Power Supply: 
AC/DC/Car battery (DC 12V 1,6A using optional battery pack);
Exclusive AC power unit supplied (AC 110/120/220/240 V, 50/60 Hz)
Dimensions (W x H x D): 
Main Unit :  238 x 92 x 240 mm
Power Unit :  78 x 92 x 240 mm
Weight (approx):
Main Unit :  2,9 kg

Power Unit :  2,3 kg

EISA 2012-2013 Audiolab M-DAC




 The new age of USB computer audio has rekindled the flame of the outboard D/A converter (DAC). Among this new breed of USB DACs few are as simple to implement or as versatile in use as Audiolab’s fabulous little M-DAC. It works directly with virtually all PCs and Macs without special USB drivers while its bold display shows a wealth of information about the incoming music data. An onboard volume control lets the M-DAC do the job of a preamp just as the choice of seven digital filters allows fine-tuning of its sound. And what a sound – powerful, insightful and delicate, it cuts to the heart of the music while remaining faithful to its soul. This is a very high performance product that’s perfect for both the computer audio novice and seasoned enthusiast alike.



Specification
Model:  M-DAC
General description:  Digital-to-analogue converter
DAC:  ESS Sabre32 9018 chip
Resolution:  32 bits
Maximum Sampling Frequency:  84.672MHz
Digital input:  2 x 24-bit/192kHz coaxial ,2 x 24-bit/96kHz Toslink optical, 1 x 24-bit/96kHz USB
Digital output:  1 x coaxial, 1x Toslink optical
Output voltage:  RCA: 2.25V RMS,XLR: 4.5V RMS
Total Harmonic Distortion:  RCA: <0 .002=".002" p="p" xlr:="xlr:">
Frequency response:  20Hz - 20kHz (± 0.2dB)
Dynamic range:  RCA: >115dB;XLR: >122dB
Crosstalk:  RCA: <-120dB;  XLR: <-130dB
Power requirements:  220--230V /100-120V (50 ~ 60Hz)
Dimensions (H x W x D):  59 x 250 x252mm
Colour:   Black, Silver

McIntosh MDA 1000

Hear all there is to hear from your existing CD collection. Let the MDA1000 modify your music data stream from 16 bits to 24 bits, and to a sampling rate of 768kHz all while still in the digital domain. Then the MDA1000’s eight, 24 bit Burr Brown digital converter take things from there. This processing allows such gentile filtering to the converted signal that the original musicality comes through, instead of the sound of the digital circuits themselves. The difference is easily heard. Listen and you will be amazed at how older discs rival, or often exceed, the sound of the new “higher resolution format” discs.

The MDA1000 D/A Converter and its matching MCD1000 CD Transport represent the introduction of a new and elite product category from McIntosh. The philosophy behind this enhanced level of McIntosh products is nothing but the best…to deliver the absolute highest possible performance without design constraints. Available only through McIntosh Authorized Premier Dealers, the MDA1000 and the MCD1000 are merely the beginning of this exclusive line.

Seven Digital Inputs

3 Coaxial Inputs on RCA Jacks

3 Optical Inputs

1 Balanced Digital in on XLR Jack

Balanced (XLR) Outputs

Unbalanced (RCA) Analog Outputs

Front Panel Volume Control with

Optional Bypass Function

3D Glass Front Panel

Fiber Optic Lighting

Remote Control

POWER SUPPLY

Multiple layers of regulation provide clean power to all critical circuits. The power transformer has the lowest noise field of any available.

CIRCUIT SHIELDS

Each D to A Converter is shielded to avoid any chance of hum or noise getting through.

VOLUME CONTROL

Precision front panel and remote volume control allow the MDA1000 to function as a preamplifier in an all-digital system. Setup programming allows volume control bypass if desired.

FRONT PANEL DESIGN

3D front panel glass design is illuminated with long-life, cool-running fiber optics that make operation in low light easier. Silk screening on the inside of the glass front panel prevents wear of the nomenclature, ensuring lasting beauty and highest resale value…a McIntosh hallmark feature.

Specifications:

ANALOG AUDIO

FREQUENCY RESPONSE:

±0.5 dB from 4 Hz to 45 kHz (sampling frequency 96 kHz and 88.2 kHz)

±0.3 dB from 4 Hz to 22 kHz (sampling frequency 48 kHz)

±0.3 dB from 4 Hz to 20 kHz (sampling frequency 44.1 kHz)

±0.3 dB from 4 Hz to 15 kHz (sampling frequency 32 kHz)

TOTAL HARMONIC DISTORTION: 0.002% at 1 kHz

A-WEIGHTED SIGNAL-TO-NOISE RATIO: Better than 110 dB

DYNAMIC RANGE:: Better than 100 dB (1 kHz)

RATED OUTPUT VOLTAGE:

2V Unbalanced Outputs (BYPASS ON Mode)

6V Unbalanced Outputs (BYPASS OFF Mode)

2V Balanced Outputs (BYPASS ON Mode)

6V Balanced Outputs (BYPASS OFF Mode)

DIGITAL AUDIO SPECIFICATIONS

DIGITAL AUDIO FORMAT: IEC958, S/PDIF

COAXIAL INPUTS (1, 2, AND 3): 0.5V p-p at 75 Ω

OPTICAL INPUTS (4, 5, AND 6): -15 ~ 20 dBm

XRL INPUT (7): 5V p-p at 110 Ω

SAMPLING FREQUENCIES: 96 kHz, 48 kHz, 44.1 kHz and 32 kHz

POWER REQUIREMENTS: 100 -240 Volts, 50/60Hz, 20W

DIMENSIONS (W x H x D): 445 x 152 x 410 mm (17½ x 6 x 16 inch)

WEIGHT: 11 kg (24 lbs.)

Marantz CDA - 94

Digital source selector,

Autochange multisampling at 32,44.1 and 48 kHz,

16-bit 4-times oversampling Digital Filter,

twin 16-bit Digital-to-Analogue converter,

Optical coupling and electronic digital inputs,

L-R independent output Amplifier,

precision analogue filters,

Balanced, variable and fixed analogue outputs,

Digital monitor input/output,

3 separate power supplies,

Customized components.

The CDA-94 is the world's first D/A conventer with multisamplig, for conversion of CD, DAT and Broadcast Satellite signals with 16-bit 4-times oversampling accuracy, and with high-precision analogue circuitry.

One Toslink coupler and two 75 ohm coaxial sockets provide digital input connections in addition, there are digital tape input and output monitor socjets; standarized connections for all the present and envisaged digital audio sources.

Absolute Phase Control

It is possible for a variety of reasons, for the absolute phase of the original music to become inverted by some part of the recording process. The absolute Phase Control allows such an inversion to be corrected digitally to restore the original harmony ofthe music. This is especially valuable for vocal performances.

The autochange circuit automatically adjusts the sampling frequency to siut the selected input 44.1 kHz for compact Disc, 48 kHz and 32 kHz for DAT and the anticipated Broadcast Satellite.

The high performance of the Marantz 16-bit 4 times oversampling digital filter and twin 16-bit D/A converter are further accentuated by optical coupling between the digital filter and the D/A converter, by high precision analogue filter and by L/R independent amplifier circuits.

Analogue Outputs

Three different forms of analogue output are provided:

Balanced output using 600 ohm output line transformer.

Fixed output. Variable output (controlled by high-precision conductive plastic potentimeter) for direct connection to power amplifier.

The circuits are based on Marantz high-technology audio engineering know-how. Three separate printed circuit boards carry the Digital input-output section, the D/A converter section and the analogue amplifiers.

These circuits are supported by three separate power transformers for total circuit separation and protection from interference and cross-coupling. The analogue circuit transformer is a special high-efficiency toroid. Furthermore carefully chosen customized components ensure the very highest performance . They include ELNA electrolityc capacitors with ceramic powder filling and damped copper styrol film damped capacitors for the analogue circuits. Capacitor leads are not of tinned steel but oxygen-free copper.

The chassis of non-magnetic diecast aluminium, provides the high rigidity to ensure absence of acoustic feedback, it also suppresses eddy current coupling.

Specifications for Marantz CDA-94

Sampling frequency: 32 kHz, 44.1 kHz, 48 kHz (automatic switchover)

Digital analog converter: The 4 time oversampling digital filter of a 16-bit L/R independent 2DAC

Frequency response (Fixed, Vriable): 2 Hz - 20 kHz ±0.1 dB (at the time of a 44.1kHz input)

Blance: 20 Hz - 20 kHz ±0.3 dB

Filter: The 3rd Bessel filter

Channel: Two channels

Dynamic range: 96 dB or more

SN ratio: 104 dB (1 kHz)

Channel separation: 100 dB or more (1 kHz)

THD: 0.0015% (1 kHz, THD)

Digital input:

Coaxial: 0.5 Vp-p/75ohms

Optical: Optical-fiber connector

Digital output: Digital-recording output: 0.5 Vp-p/75ohms

Analog output:

A fixture and a balance: 2.5 Vmax/600 ohms (XLR)

A fixture and unbalance: 2.5 Vmax/120 ohms (RCA)

Variable and unbalance: Zero to 2.5 Vmax/120 ohms (RCA)

Headphone output: 0 - 50 mW/eight ohms

Power source: 220/240 V AC, 50/60 Hz

Power consumption: 28 W

Dimensions (W x H x D): 462 x 104 x 368 mm

Weight: 9 kg