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Joemeek SC4 Скачать руководство пользователя страница 4

SC4 M&S DAD Stereo Compressor - User's guide

SC4

4

SC4 Main Features

1) THE ANALOGUE COMPRESSOR SECTION

The SC4 IS a Joemeek SC2 stereo compressor with additional features:

The analogue inputs are balanced via XLR connectors, at line level, and the
input gain control can add gain up to a limit of 18 dB.

After the input stage, the audio is converted to 'middle and side' mode, this
means that one channel contains the 'volume' (sum) information, while the other
contains the 'width'(difference) information.

A front panel switch disables the MS coder so that either analogue or digital
signals in MS mode can input directly.

On the rear panel two Jack sockets give insert access to the 'middle' and 'side'
audio signals. This is so that special effects can be introduced by processing
the width information independently of the volume information.

The signals go through the compression circuits where a non-linear sidechain
drives light sources, and the actual compression is done with photo-resistors.
This is the heart of the Joemeek sound.

Because of the difficulties in achieving a true hard-wired 'bypass' switch
(especially with digital), the 'compression in/out switch has the additional facility
of switching in extra gain to allow for the compression effect. Although the
amount is only 2dB, this makes the comparison 'compressed/uncompressed'
switch very much more useable.

Metering is unconventional: The left hand meter reads the volume information in
the stereo signal, the right hand meter reads the compression depth in real
time.

After compression, the 'side' channel goes through a separate variable amplifier
giving a 'width' control.
This affects the stereo image so that it is variable all the way from 'mono' out to
200% stereo.

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Содержание SC4

Страница 1: ...ERFECT STEREO IMAGING DIGITAL AND ANALOGUE FLEXIBILITY User s Guide The SC4 Stereo Compressor delivers perfect stereo imaging and control classic JOEMEEK sound and complete analogue and digital flexibility to recording studios broadcasters and post production suites ...

Страница 2: ... sounds the way it does 6 Mimic Rock concerts 7 Time 8 CONTROLS AND INDICATORS 9 INPUTS AND OUTPUTS 11 TECHNICAL SPECIFICATION 12 SAFETY WARRANTY 13 Ted Fletcher This instruction book was written by Ted Fletcher the designer of the original JOEMEEK compressor and the whole JOEMEEK range of professional audio equipment Ted worked in the studio with Joe Meek the legendary record producer in the mid ...

Страница 3: ... SC4 brings the Joemeek compressor fully up to date with the addition of a super quality yet flexible digital interface and the introduction of some new features to make working in the digital domain even easier In the Joemeek studio we have been experimenting with sum and difference or MS recording and processing this is a technique where a stereo signal is changed to sum and difference the sum r...

Страница 4: ... processing the width information independently of the volume information The signals go through the compression circuits where a non linear sidechain drives light sources and the actual compression is done with photo resistors This is the heart of the Joemeek sound Because of the difficulties in achieving a true hard wired bypass switch especially with digital the compression in out switch has th...

Страница 5: ...After compression and the analogue output gain control the decoded audio signal drives both the analogue output stages and the analogue to digital converters The clocking of the digital output is selectable A local remote switch selects whether the output follows the incoming clock or generates a local clock Another select switch determines the local clock setting 44 1 or 48KHz LEDs show the selec...

Страница 6: ...lly as engineering devices they actually sound unmusical The JOEMEEK compressor is the first device commercially available to have been designed purely as an effects compressor Its purpose is to change the way the ear perceives the sound its action changes the clarity balance and even rhythmic feel of music DYNAMICS The human ear has a fantastic dynamic range it hears and can interpret sounds from...

Страница 7: ... amplifier is reduced If the input level keeps rising gradually the gain reduction becomes LESS effective and the amplifier goes back to being a linear amplifier except with the volume turned down And this is precisely how the human ear behaves So the ear is fooled into thinking that the JM compressed sound is louder than it really is but without the strange psychoacoustic effect of deadness that ...

Страница 8: ...y design TIME Of course the JoeMeek compound compression curves tell only part of the story There are also the time constants of attack and release which have enormous effect on the musicality of the sound The attack time produces audio punch that again is a psychoacoustic effect different attack times mimicking different levels of human biological compression Release time is even more important t...

Страница 9: ... the D A converter A yellow LED indicates that the digital input is live M S INPUT is a push button that disables the internal M S coder In this mode the output of microphone amplifiers with M S microphones attached or M S recordings can be directly connected to the SC4 COMPRESSION is a rotary control setting the amount of drive to the compressor sidechain The range is from off to maximum compress...

Страница 10: ... whether to follow external or internal clock The button is only active when there is a digital source connected SAMPLERATE push button sets the internal clock to 44 1 or 48KHz EXT SYNC LED illuminates when a digital input is present Samplerate LEDs show the selected frequency They are only alight when the local onboard clock is active On the rear panel there is a single push button When out the d...

Страница 11: ...ided so that additional analogue circuits may be inserted into the sum and difference MS path The tip is the buffered analogue output of the MS coder the ring is the input of the compressor DIGITAL INPUTS AND OUTPUTS All digital connections DC isolated from analogue systems TOSLINK Optical inputs and outputs AES EBU XLR input and output POWER Power input is 230 or 115VAC at approx 12 watts Voltage...

Страница 12: ...alogue path 0 1dB 10Hz to 20KHz digital path HARMONIC DISTORTION less than 0 01 at all frequencies and levels except under compression where 2nd harmonic distortion is generated by the compression MAX OUTPUT 26dBu NOISE less than 84dBu dynamic range exceeds 110dB DIGITAL SIGNAL PATH INPUTS AND OUTPUTS optional on some models AES EBU and TOSLINK OPTICAL CONVERSION PERFORMANCE A D 1 bit system produ...

Страница 13: ...curs excluding physical mistreatment within 12 months of purchase no service charge will be made Manufactured by FLETCHER ElectroAcoustics Ltd Quay House Quay Road Newton Abbot DevonTQ12 2BU Tel 44 1626 333948 Fax 44 1626 333157 e mail sales joemeek uk com DECLARATION OF CONFORMITY This analogue audio processing equipment conforms to the standards and requirements of the European Economic Communit...

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