● Double-tuned front end easily handles high signal levels ● Revolutionary DDS
principle for local oscillator ● Variable bandwidth IF filter prevents interference● Multipath reduction function ● Digital FM demodulator keeps distortion and noise
to a minimum ● DS-DC achieves ideal stereo demodulation with DSP technology● MDS type D/A converter ● Memory buttons give quick access to 20 stations

Discover supreme listening pleasurewith a reference quality FM tuner.
The ultimate tool for aficionados of FM stereo broadcasts.
Using a blend of latest RF circuit design with sophisticated digital signal processing, most major
functions after the intermediate frequency stage such as the variable bandwidth IF filter, multipath
reduction, digital FM demodulator and DS-DC stereo demodulation have been moved to software on
the DSP chip. Manual tuning using the pulse tuning method, plus 20-station memory tuning. A digital
output provides further flexibility. Realizing impeccable sound quality and outstanding performance inan easy to use format, this FM tuner has been developed for demanding audio and music connoisseurs.

Double-tuned front end easily handles high signal levels
The front end not only must provide selectivity for weak radio signals, italso needs to competently handle broadcast stations with strong fieldstrength and convert the signal to the intermediate frequency (IF) while
suppressing interference and distortion. The T-1200 performs thesetasks brilliantly, thanks to a double-tuned circuit with excellent selectivity
characteristics, placed before the RF amplification stage. This proactively
prevents intermodulation distortion and blocking which can otherwise
occur with strong input signals. The two-stage design with anotherdouble-tuned circuit after the RF amplifier further bolsters performance,
resulting in excellent sensitivity and selectivity. The double-balanced
mixer with differential input also employs a two-stage topology, forming adouble super heterodyne circuit. Any type of interference signal is reliably
blocked before IF conversion.

FMantenna

AGC

RFamplifier

Double-tuned circuit

Double-tuned circuit
Doublebalanced
mixer

Attenuator

Doublebalancedmixer

IF output

Local/distance selector
DDS local oscillator■ Front End Circuit Diagram

Revolutionary local oscillator principle: DDS (Direct Digital Synthesis)

Sine wavedata

The mixer combines the signal from the antenna input with the signal
from a local oscillator for conversion into the intermediate frequency (IF).
The local oscillator in the T-1200 is a DDS (Direct Digital Synthesis)
circuit. In a conventional PLL (Phase Locked Loop) circuit, feedback isused to stabilize the frequency, but this produces frequency modulation
components that tend to degrade S/N ratio. With DDS on the other hand,the output of a quartz oscillator is divided to create the digital signal
timing that governs the readout of sine wave data and the operation ofthe D/A converter which produces the analog waveform output. Because
there are no frequency modulation components, a highly pure signal withoutstanding S/N ratio is created by this revolutionary circuit.

D/A
converter

Output0110
Quartzoscillator

Frequency
divider■ DDS Block Diagram
DDS local oscillator

Variable bandwidth IF filter improves interference performance
The IF BANDWIDTH selector of the T-1200 provides a choice of six
settings (50, 75, 100, 150, 250, 500 kHz). Normally, a wider bandwidth
setting is preferable in terms of performance characteristics, but byrestricting the bandwidth, noise can be reduced in certain situations,making it easier to obtain a good quality signal from a station affected byinterference from a strong adjacent station.

IF bandwidth
switchable
in 6 stages

Narrow IF bandwidth
reduces interference

Wide IF bandwidthis susceptible todegradation by noise
and interference

6 selectable bandwidth settings

Noise or adjacentbroadcast station

The variable bandwidth IF filter is implemented using a FIR (FiniteImpulse Response) type digital filter with perfectly linear phasecharacteristics, thereby eliminating the phase shift that can occur withconventional IF bandwidth filters.
f0

Variable bandwidth IF filter

Floating point digital signal processor (DSP) chip

Multipath reduction (MPR) function minimizes reflections
Multipath reception refers to a condition where the same broadcast
signal reaches the antenna via several different propagation routes. In
the case of FM, this occurs when the signal travels to the antenna in astraight line, but is also reflected and therefore slightly delayed bybuildings, mountains or other tall obstructions. When the direct waves
and reflected waves are received together, distortion and noise occur.
The high-speed, high-precision DSP chip in the T-1200 makes it possible
to perform multipath reduction (MPR) through signal processing that
effectively suppresses the harmful reflected components. This technique,which is based on adaptive filtering principles, greatly reduces reflectedwave components and ensures that only the desirable direct wave
components are received, resulting in high-quality audio output.

Adaptive filterInput(IF digital signal)

FIR (FiniteImpulseResponse)type filterAddition of reflectedwave componentschanges theamplitude.

OutputCancellation ofreflected wave
components resultsin uniform amplitude.

Multipathdetector■ Multipath Reduction Function

Digital FM demodulator keeps distortion and noise to a minimum
The FM demodulator circuit is a crucial component that has a significant
effect on distortion and noise characteristics of the tuner’s audio output.
In the T-1200, the imaginary part of the digitized FM signal is divided by
the real part to extract the tangent of the phase angle (θ). By calculating
the arctangent from this, the phase angle can be determined.
Differentiation is then used to obtain the time variation of the phase angle
resulting in the FM demodulated output (audio output).

Phase detector
Real part
FM wavesignal input

Divisiontanθ

Phase angle
Arctangent(tan–1)(θ)

Differentiation
Demodulated
outputImaginarypart■ Digital FM Demodulator

Memory slots for 20 stations

Reception frequency
indication▲

Station memory numberindication▲

The station buttons make it easy to store and recall up to 20 broadcast
stations. The settings for MUTE, MODE, LOCAL, MPR and IFBANDWIDTH are also stored at the same time, making it possible forexample to memorize different settings for various reception conditions
and instantly access them as needed.

1

2

34

8

5

61 MUTE button eliminates inter-stationnoise.

3 LOCAL button enables attenuation ofexcessive antenna input levels.

5 METER button switches between signalindication and multipath indication.

77 MEMORY button serves for storing
stations in STATION buttons.

2 MODE button allows selection ofStereo / Blend / Mono.

4 MULTIPATH REDUCTION button improves receptionof direct waves by suppressing reflected waves.

6 STATION buttons give access to 20
broadcast stations.

8 IF BANDWIDTH knob helps to reduce
interference from adjacent stations.

DS-DC achieves ideal stereo demodulation with DSP technology
The stereo demodulator in the T-1200 features a principle called DS-DC(Direct Synthesis – Double Cancellation). The demodulator comprises thetwo technologies described below. Since all operations are carried out in thedigital domain through software-based algorithms in the DSP chip, ideal
stereo demodulation performance can be achieved, resulting in amazingly
high channel separation.

❶ Pilot Tone Direct Synthesis
A conventional FM tuner uses a PLL circuit to extract the pilot tone and obtain thefrequency and phase components from the input signal (stereo-modulated signal). If thelevel of the pilot tone decreases, noise will be heard and stereo separation becomes
extremely poor. With DS-DC, the pilot tone in the input signal is identified and directlygenerated by the DSP arithmetic. Therefore, even when there is a high level of noise,pilot tones can be reliably generated. This means that impressive stereo separation isachieved also at low pilot tone levels.

Stereomodulated
signalChannelseparator

Crosstalkcancellation(1st stage)(2nd stage)

LR

Pilot tone
directsynthesis

Crosstalk double cancellation
Pilot tone

■ DS-DC Type Stereo Demodulator Circuit

Response in dB❷ Crosstalk Double Cancellation
After the input signal has been separated into the left and right components, the circuiteliminates crosstalk using a dual approach that also takes phase components intoconsideration. The result is extremely thorough left/right separation.
■ Supplied RemoteCommander RC-430
Enables control of all
functions of the tuner
except power on/off.
Also allows volume
control withAccuphaseamplifiers.

Crosstalkcancellation

DSP chip for DS-DC

0−5−10−15−20−25−30−35−40
−45
−50
−55
−60
−65
−70
−75
−80
−85
−90−9520 30 50

Lch→Rch

100Rch→Lch
200500 1k
Frequency in Hz

2k 3k

5k

Channel separation characteristics

10k

■ MDS type D/A converter■ Meter for monitoring signal status■ Station buttons give quick access to 20
broadcast stations

Provides a clear visual indication of signal strength as well as multipath condition and effect of multipath reduction.

■ Accuphase original pulse tuning systemprovides traditional manual tuning feelMultipath indication

Signal strength indication■ Confirmation beep when operating tuning
knob and function buttons■ High-quality digital output connector(coaxial)

Pulse tuning system■ Attenuator function for reducing antenna
input level■ Multipath reduction function■ Muting circuit eliminates inter-station noise

Multipath reduction OFFThis sophisticated function effectively suppresses problems caused by multipath reception.
Multipath reduction ON■ Balanced and Line analog outputs using
Direct Balanced Filter circuit■ MODE button allows selection of desired
reception mode
① STEREO: Normal stereo reception② BLEND: Left and right signals are mixed,
to reduce noise particularly in theupper frequency range③ MONO:

Digital output connector■ Balanced output polarity selector● The default switch position at the time of shipment is asshown here (pin ❸ +).

● Sliding the switch to the right selects the “pin ❷ +”Stereo broadcast reception forced
to monophonic modeposition.

MODE selectionFront Panel
Signal / Multipath indicator
Signal / Multipath meter
MODE indicator
STEREO / BLEND / MONOPower switch
Muting button
Mode button
Local/Distance(signal strength) selector button

Rear Panel

Station memory
number indicator

STEREOindicator

IF BANDWIDTH
indicator

Reception
frequency indicator

Tuning knob

Antenna input
connector

Analog output
connectors
BALANCED / LINE

Digital output
connector
COAXIAL

Station buttons
Memory button
Meter function selector button
Multipath reduction button

Balanced output polarity selector

AC power supply
connector ★

IF bandwidth
selector knobGuaranteed Specifications [Guaranteed specifications are measured according to IEC 60315-4.]◆ Reception frequency range：87.5 to 108.0 MHz
The tuning step width depends on the destination country.

Rated output voltage (±75 kHz deviation)

MonophonicStereo

Sensitivity

Sensitivity

Usable sensitivity
9 dBμVS/N 50 dB quieting sensitivity 12 dBμV
S/N ratio (85 dBf input, A-weighted)
92 dB
Total harmonic distortion (85 dBμ input, ±75 kHz deviation)
20 Hz
0.02%
1 kHz
0.02%
10 kHz0.02%
Frequency response 10 to 15,000 Hz +0−2.0 dB
Alternate channel selectivity (IF bandwidth 250 kHz)Interference signal Selectivity
70 dB
400 kHz
30 dB
300 kHz
10 dB
200 kHz
Capture ratio
RF intermodulation
Spurious response rejection
Image rejection
AM suppression (70 dBμ input)

Supplied accessories● AC power cord
● Audio cable with plugs (1 m)● Remote Commander RC-430

1.5 dB
80 dB
120 dB
100 dB
80 dB

1.0 V

S/N 40 dB quieting sensitivity 18 dBμV
S/N 50 dB quieting sensitivity 30 dBμV
S/N ratio (85 dBf input, A-weighted)
76 dB
Total harmonic distortion (85 dBμ input, ±75 kHz deviation)
20 Hz
0.04%
1 kHz
0.04%
10 kHz0.04%
Frequency response 10 to 15,000 Hz +0 −2.0 dB
Stereo separation
100 Hz
65 dB
1 kHz
65 dB
10 kHz
50 dB
Stereo trigger level
9 dBμV
Subcarrier suppression ratio
70 dB

Tuning principle

DDS synthesizer tuning
20-station random memory tuning
Variable bandwidth IF filter 50 kHz, 75 kHz, 100 kHz, 150 kHz,250 kHz, 500 kHz switchable
FM detection principle Digital FM demodulator
Stereo demodulation principle DS-DC
Digital output (IEC 60958)
COAXIAL:
0.5 VP-P 75 ohms
Sampling frequency: 48 kHz / 24 bit
Output impedance
BALANCED (XLR type connector): 100 ohms
(50 ohms / 50 ohms)
LINE (unbalanced):50 ohms
Signal strength / Multipath, switchable
Meter
Power requirements AC 120 V/220 V/230 V 50/60 Hz(Voltage as indicated on rear panel)Power consumption
Maximum dimensions

GeneralAntenna input 75-ohm coaxial (F type connector)
Standing wave ratio 1.5●●●

Mass20 W
Width 465 mm (18.30")
Height 151 mm ( 5.96")
Depth 406 mm (16.00")
13.0 kg (28.7 lbs) net
19.0 kg (41.9 lbs) in shipping carton

An FM antenna is required to use the T-1200. Please consult your dealer regarding antenna installation.
In residences with shared antenna systems, confirm that the antenna outlet carries FM signals.
Use a 75-ohm coaxial cable with F type plug for the antenna connection.

Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.
★ The reception frequency range, number of display digits, and tuning frequency steps differ in models for different countries. The antenna connector may also be an IEC type or F type connector.
Please verify that you have the correct model for your area.

●The specifications and appearance of this product are subject to change without notice.

5年間保証

E1805Y PRINTED IN JAPAN 850-2209-00(B1)