Panasonic SA-HT640WP User manual

lGeneral
Power Source:
A
C 120V, 60Hz
Power consumption: 85 W
Dimensions (W×H×D): 430×70×439.2 mm
(16-15/16”×2-3/4”×17-19/64”)
Mass: 4.65 kg (10.25Ibs)
lAmplifier section
RMS Output Power: Dolby Digital Mode
lTotal RMS Dolby Digital
mode Power: 850 W
At 1kHz and total harmonic of 10%
lFront: 110 W/ Channel (3Ω)
lCenter: 225 W/ Channel (6Ω)
lSurround: 90 W/ Channel (4Ω)
At 100Hz and total harmonic of 10%
lActive subwoofers: 225 W/ Channel (6Ω)
FTC Output Power: Dolby Digital Mode
lTotal FTC Dolby Digital mode Power:
300 W
At 120Hz-20kHz and total harmonic of 1%
lFront: 40 W/ Channel (3Ω)
lCenter: 75 W/ Channel (6Ω)
lSurround: 40 W/ Channel (4Ω)
©2006 Panasonic AVC Networks Singapore Pte.
Ltd. All rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-HT640WP
SA-HT640WPC
Colour
(S).......................Silver Type
At 45Hz-120Hz and total harmonic of 1%
lSubwoofer: 65 W/ Channel (6Ω)
lFM tuner section
Preset Memory:: FM 15 stations
AM/MW 15 stations
Frequency Range: 87.9-107.9MHz
(200kHz in step)
87.5-108.0MHz
(100kHz in step)
Sensitivity: 2.5µV (IHF)
S/N 26dB 2.2µV
Antenna Terminals: 75Ω(unbalanced)
lAM tuner section (AM/MW)
Frequency Range: 520-1710kHz (10kHz in step)
AM Sensitivity S/N 20dB at
1000kHz: 560µV/m
lPhone Jack:
Terminal: Stereo 3.5 mm (1/8”) jack
lFront/Rear M. Port:
Sensitivity: 100mV (4.7kΩ)
Terminal (Input): Stereo 3.5 mm (1/8”) jack
lDisc section
Discs played [8 cm (3”) or 12 cm (5”)]:
DVD Home Theater Sound System
Specifications
ORDER NO.MD0512492C1
A6

(1) DVD [DVD-Video, DVD-Audio]
(2) DVD-RAM [DVD-VR, JPEG(*4,5)]
(3) DVD-R [DVD-Video]
(4) DVD-RW [DVD-Video]
(5) +R/+RW [Video]
(6) CD, CD-R/RW [CD-DA, Video CD, SVCD(*1), MP3(*2,5),
WMA(*3,5), JPEG(*4,5), HighMAT Level 2 (Audio and
Image)]
*1 Conforming to IEC62107
*2 MPEG-1 Layer 3, MPEG-2 Layer 3
*3 Windows Media Audio Ver.9.0 Class 2A
lNot compatible with Multiple Bit Rate (MBR)
*4 Exif Ver 2.1 JPEG Baseline files
lPicture resolution: between 320 x 240 and 6144 x 4096
pixels (Sub sampling is 4:2:2 or 4:2:0). Extremely long and
thin pictures may not be displayed.
*5 The total combined maximum number of recognizable audio
and picture contents and groups: 4000 audio and picture
contents and 400 groups.
Pick up:
Wavelength:
lCD: 785nm
lDVD: 662nm
Laser power:
lCD: CLASS I
lDVD: CLASS II
Audio output (DISC):
Number of channels: 5.1 ch (FL, FR, C, SL, SR,
SW)
Audio performance:
Frequency response:
DVD (linear audio): 4 Hz-22 kHz (48 kHz sampling)
4 Hz-44 kHz (96 kHz sampling)
DVD-Audio: 4 Hz-88 kHz (192 kHz
sampling)
CD-Audio: 4 Hz-20 kHz
S/N ratio:
CD-Audio: 105 dB
Dynamic range:
DVD (linear audio): 95 dB
CD-Audio: 95 dB
Total harmonic distortion:
CD-Audio: 0.005 %
lVideo section
V
ideo system:
Signal system: NTSC
Composite video output:
Output level: 1 Vp-p (75 Ω)
Terminal: Pin jack (1 system)
S-video output:
Y
output level: 1 Vp-p (75 Ω)
C output level: NTSC; 0.286 Vp-p (75 Ω)
Terminal S terminal (1 system)
Component video output (480p/480i):
Y
output level: 1 Vp-p (75 Ω)
PBoutput level: 0.7 Vp-p (75 Ω)
PRoutput level: 0.7 Vp-p (75 Ω)
Terminal: Pin jack (Y: green, PB: blue,
PR: red) (1 system)
Power consumption in standby mode:
approx 0.4W
Note:
1. Specifications are subject to change without notice.
Mass and dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
Solder:
This model uses lead free solder (PbF).
Mechanism:
This model uses RC1 (Rotary tray) mechanism.
Refer to the original service manual for *1, *2, *3, *4.
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SA-HT640WP / SA-HT640WPC

1 Safety Precautions 5
1.1. GENERAL GUIDELINES 5
1.2. Before Repair and Adjustment 5
1.3. Protection Circuitry 6
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 6
3 Precaution of Laser Diode 8
4 About Lead Free Solder (PbF) 8
5 Handling Precautions for Traverse Unit 9
5.1. Cautions to Be Taken in Handling the Optical Pickup Unit
9
5.2. Grounding for electrostatic breakdown prevention 9
6 Accessories 11
7 Operation Procedures 12
7.1. Operating instructions 12
7.2. Disc information 15
8 New Features 17
8.1. RF Wireless Audio Transceiver 17
8.2. Detail Block Diagram (Receiver module) 19
8.3. Class-D Amplifier 23
9 Self-Diagnosis and special mode setting 27
9.1. Service Mode Summary Table 27
9.2. Service Mode Table 1 27
9.3. DVD Self Diagnostic Function-Error Code 32
9.4. Sales Demonstration Lock Function 34
9.5. Service Precautions 35
10 Assembling and Disassembling 36
10.1. Disassembly Flow Chart 37
10.2. Main Components and P.C.B. Locations 37
10.3. Disassembling the Top Cabinet 38
10.4. Disassembling the Front Panel Assembly 38
10.5. Disassembling the Tray Assembly 38
10.6. Disassembling the Rear Panel 39
10.7. Disassembling the Mechanism Base Assembly 39
10.8. Disassembling the FL & Head phone P.C.B. 39
10.9. Disassembling the Main P.C.B. 39
10.10. Disassembling the AC Inlet, Power & Sub power P.C.B 40
10.11. Disassembly of Digital Amp IC 40
10.12. Disassembly of Regulator IC 40
10.13. Disassembly of Switch Regulator IC (IC5701) 40
10.14. Disassembly of the Tray Base Guide (L) and Tray Base
Guide (R) 41
10.15. Disassembly of the Rotary Tray 41
10.16. Disassembly of the Traverse Unit 42
10.17. Assembly of Tray Assembly 44
11 Service Fixture and Tools 46
12 Service Positions 46
12.1. Checking & Repair Main P.C.B., Power P.C.B., FL and
Head phone P.C.B. 46
12.2. Checking & Repair DVD Module P.C.B 46
13 Measurements and Adjustments 47
13.1. Service Tools and Equipment 47
13.2. Important points in adjustment 47
13.3. Storing and handling of test discs 47
13.4. Optical adjustment 48
13.5. Abbreviations 49
14 Voltage and Waveform Chart 51
14.1. DVD Module P.C.B. 51
14.2. Main P.C.B. 52
14.3. Power P.C.B. 53
14.4. FL P.C.B. 53
14.5. Loading Motor P.C.B., Tray Motor P.C.B., Sensor P.C.B.
54
14.6. Waveform Chart 55
15 Illustration of IC's, Transistors and Diodes 56
16 Wiring Connection Diagram 57
17 Block Diagram 59
18 Schematic Diagram 67
18.1. (A) DVD Module Circuit 69
18.2. (B) Main Circuit 73
18.3. (C) Power Circuit 79
18.4. (D) FL and Headphone Circuit 83
18.5. (E) Loading Motor, Tray Motor and Sensor Circuit 85
19 Printed Circuit Board 87
19.1. (A) DVD Module P.C.B. 87
19.2. (B) Main, AC-Inlet & Sub Power P.C.B. 88
19.3. (C) Power P.C.B. 89
19.4. (D) FL, Headphone, Loading motor, Tray motor, Sensor
and Regulator P.C.B. 90
20 Basic Troubleshooting Guide 91
20.1. Basic Troubleshooting Guide for DVD Module 91
20.2. Basic Troubleshooting Guide for Traverse Unit 93
20.3. Troubleshooting Guide for Wireless Surround Speaker
(SB-SA640) 94
21 Overall Block Diagram for HT640 97
21.1. SC-HT640 DVD Unit Block Diagram 98
21.2. HT640 Block Diagram (Analog Signal : DVD 5.1ch Play
Back Mode) 99
21.3. Service parts replacement 100
22 Terminal Function of ICs 103
22.1. IC2001 (MN101C49GHG): Micro-processor IC 103
CONTENTS
Page Page
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23 Explode Views 104
23.1. Cabinet Parts Location 104
23.2. Packaging 107
24 Replacement Parts List 108
24.1. Component Parts List 109
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1 Safety Precautions
1.1. GENERAL GUIDELINES
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, carry out the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.1.1. LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on
the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 1MΩand 5.2MΩ.
When the exposed metal does not have a return path to the chassis, the reading must be .
Figure 1
1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5kΩ, 10 watts resistor, in parallel with a 0.15µF capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may
be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the limits
specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to
the customer.
1.2. Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C5700, C5717, C5718, C5742, C5796 through a 10 Ω, 10 W resistor
to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 120 V, 60 Hz in NO SIGNAL mode volume minimal should be ~ 900 mA.
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1.2.1. Caution for fuse replacement
1.3. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
· No sound is heard when the power is turned on.
· Sound stops during a performance.
The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
“shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:
1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can
generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable
conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD)
sufficient to damage an ES device).
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3 Precaution of Laser Diode
CAUTION:
This unit utilizes a class 1 laser.
Invisible laser radiation is emitted from the optical pickup lens.
Wavelength: 662nm(DVD)/785nm(CD).
Maximum output radiation power from pickup: 100µW/VDE
When the unit is turned on:
1. Do not look directly into the pick up lens.
2. Do not use optical instruments to look at the pick up lens.
3. Do not adjust the preset variable resistor on the pickup lens.
4. Do not disassemble the optical pick up unit.
5. If the optical pick up is replaced, use the manufacturer’s specified replacement pick up only.
6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous
radiation exposure.
4 About Lead Free Solder (PbF)
Distinction of PbF PCB: PCBs (manufactured) using lead free solder will have a PbF stamp on the PCB.
Caution:
· Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher.
Please use a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ±
20°F (370 ± 10°C).
· Pb free solder will tend to splash when heated too high (about 1100°F/ 600°C).
When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until it melts enough.
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SA-HT640WP / SA-HT640WPC

5 Handling Precautions for Traverse Unit
The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be
taken avoid caution to electrostatic breakdown when servicing and handling the laser diode.
5.1. Cautions to Be Taken in Handling the Optical Pickup Unit
The laser diode in the optical pickup unit may be damaged due to electrostatic discharge generating from clothes or human body.
Special care must be taken avoid caution to electrostatic discharge damage when servicing the laser diode.
1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.
2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup unit removed should
be short-circuited with a short pin or a clip.
3. The flexible cable may be cut off if an excessive force is applied to it. Use caution when handling the flexible cable.
4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexible
cable, cut off the antistatic FPC.
5.2. Grounding for electrostatic breakdown prevention
Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static
electricity in the working environment. Proceed servicing works under the working environment where grounding works is
completed.
5.2.1. Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
5.2.2. Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body.
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SA-HT640WP / SA-HT640WPC

Remote control
AM loop antenna
FM indoor antenna
Video Cable
AC cord
Digital transceiver*
Speaker label
6 Accessories
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7 Operation Procedures
7.1. Operating instructions
7.1.1. Remote Control Key Buttons Operations
SFC
CH SELECT PLAY MODE
CD MODE
TEST
FL DISPLA
C. FOCUS
Y
Turn the unit on/off
Basic operations for play
Show a disc top menu or program list
Frame-by-frame/Select or register menu
items on the television screen
Show on-screen menu
Television operations
Show a disc menu or play list
Return to previous screen or show the setup menu
To use functions labelled with
Press and hold the button for at least 2 seconds.
Adjust the volume of the main unit
Select the source
MUSIC P./REAR MUSIC P.
DVD/CD, FM/AM, AUX/FRONT
Select the disc or show disc information
Change the television's video input mode
Select disc's title numbers etc./Enter numbers
Adjust the television volume
Select preset radio stations
MUTING
PL
SUB WOOFER
QUICK OSD
SLEEP
LEVEL
":
"
Cancel
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7.1.2. Main Unit Key Buttons Operations (SA-HT640W)
OPEN/CLOSE EXCHANGE SKIP
POWER MUSIC SURROUND
MUSIC
PORT
5 DISC SELECTOR
SELECTOR
TUNINGTUNING
12345
MEMORYMEMORY TUNE MODETUNE MODE FM MODEFM MODE
VOLUME
DISC DISC
SELECTOR
DVD/CD FM AM AUX FRONT
REAR MUSIC P.
MUSIC P.
Return to DVD/CD
Display
DISC EXCHANGE
Open the disc drawer to
exchange the disc in the
play position
DISC SKIP
Skip to the next disc tray
Open/Close the disc drawer
5 DISC SELECTOR
Select the disc tray
// - TUNE MODE FM MODE
-
Stop playing/Select the tuning mode
Adjust the FM reception condition
/MEMORY
Play discs/Memorize the
receiving radio stations
/ TUNING
Skip or slow-search play/
,
Select the radio stations
Standby/on switch [POWER
MUSIC PORT
OPEN/CLOSE
/I]
Press to switch the unit from on to standby mode
or vice versa. In standby mode, the unit is still
consuming a small amount of power.
VOLUME
Turn up/down the volume
SURROUND MUSIC
Equalizing the sound
Phones
Connect headphones
Connect an external device
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7.1.3. Wireless Surround Speaker Key Buttons Operations (SB-SA640)
ON
MUSIC PORT
OFF
AC IN
WIRELESS
Power indicator
This indicator lights when the unit is
plugged into the AC outlet.
MUSIC PORT
Connect an external device
Wireless selector [WIRELESS ON, OFF]
ON
OFF :Select when enjoying audio from the main unit.
:Select when enjoying audio from MUSIC PORT
on the surround speaker.
Lighting Ring
The light goes out when the speaker is
in standby mode.
Note: Refer to original service manual (Order No. MD0512492C1) for more information of this unit (SB-SA640).
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SA-HT640WP / SA-HT640WPC

7.2. Disc information
It may not be possible to play all the above-mentioned discs in some cases due to the type of disc or condition of the recording.
Discs that cannot be played Note about using a DualDisc
To clean discs
Disc handling precautions
Clean this unit with a soft, dry cloth.
Never use alcohol, paint thinner or benzine to clean this unit.
Before using chemically treated cloth, carefully read the instructions that
Do not use commercially available lens cleaners as they may
Before moving the unit, ensure the disc trays are empty.
came with the cloth.
cause malfunction. Cleaning of the lens is generally not neccessary
although this depends on the operating environment.
Failure to do so will risk severely damaging the disc and the unit.
DVD-V
DVD-Video
DVD-Audio
Video CD
DVD-RAM
DVD-R
File System) Standard Version 1.0.
—
Discs that can be played
The digital audio content side of a DualDisc does not meet
the technical specifications of the Compact Disc Digital Audio
(CD-DA) format so playback may not be possible.
insert it correctly and it may get scratched or scraped.
Do not use DualDisc in this unit as it may not possible to
Some DVD-Audio Discs contain DVD-Video content.
DVD-A
VCD
—
DVD-V
DVD-V
DVD-VR
DVD-VR
DVD-V
Including SVCD (Conforming to IEC62107).
JPEG
JPEG
Recorded with devices using Version 1.1 of the Video Recording Format (aunified video recording
standard), such as DVD video recorders, DVD video cameras, personal computers, etc.
Recorded with Panasonic SD multi cameras or DVD video recorders using the
DCF (Design rule for Camera
(DVD-Video) (DVD-Video)/DVD-RW
(Video) (Video)
CD
+R +RW/
Discs recorded and finalized
Discs recorded and finalized
on DVD video recorders or DVD video cameras.
This unit can play CD-R/RW recorded with the above formats. Close the sessions or finalize
This unit also plays HighMAT discs.
recording.
HDCD-encoded CDs sound better because they are encoded with 20 bits, as compared with 16 bits for all other CDs.
This unit is compatible with HDCD, but does not support the Peak Extend function (a function which expands the
dynamic range of high-level signals).
on DVD video recorders or DVD video cameras.
the disc after
DVD-V
JPEGMP3 VCDWMA
JPEGMP3WMA
WMA
CD
CD
This unit does not support Multiple Bit Rate (MBR: an encoding process for audio content that produces an
audio file encoded at several different bit rates).
DVD-RW version 1.0, DVD-ROM, CD-ROM, CDV, CD-G, SACD,
DivXVideo Discs andPhotoCD, DVD-RAM that cannot be removed
fromtheir cartridge, 2.6-GB and 5.2-GBDVD-RAM, and “Chaoji
VCD”available on the market including CVD,DVCDand SVCD that
do not conform to IEC62107.
Wipe with a damp cloth and then wipe
dry.
Do not attach labels or stickers to discs. This may cause disc
warping, rendering it unusable.
Do not write on the label side with a ball-point pen or other writing
instrument.
Do not u
prevent static electricity, or any other solvent.
se record cleaning sprays, benzine, thinner, liquids which
Do not use scratch-proof protectors or covers.
Do not use the following discs:
– Discs with exposed adhesive from removed stickers or labels
(rented discs, etc).
– Discs that are badly warped or cracked.
– Irregularly shaped discs, such as heart shapes.
A process that allows play on compatible equipment.
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8 New Features
· This model is equipped with the digital transmitter and receiver (SB-SA640) to enjoy surround sound wirelessly. For more
information on this model, please refer to the original service manual.
8.1. RF Wireless Audio Transceiver
8.1.1. Block Diagram
8.1.2. Definition
1. ADC : Analog-to-Digital Converter
2. Transceiver : Transmitter-Receiver Device
3. PA : Power Amplifier
4. DAC : Digital-to-Analog Converter
8.1.3. Features
· Crystal Clear CD Quality Stereo Sound
· Highly Robust Forward Error Correction
· 44.1KHz / 48KHz sampling frequency
· Adaptive Frequency Hopping System
· Range (open space) : 100m
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· Low power consumption
· SNR (for left / right channel analog interface) : 80 dB
· THD : 0.2%
· Compact : 40mm x 80mm
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8.2. Detail Block Diagram (Receiver module)
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8.2.1. Operation
RF signal transmission and reception:
During the receive process, the radio signal is taken from a pair of balanced RF I/O pins that feed into the low noise amplifier (LNA).
Direct I/Q down conversion and on-chip filtering send the processed I/Q data to the analog-to-digital converter before processing
by the GFSK (Gaussian Frequency Shift Keying) demodulator. Within the demodulator, data detection and timing recovery circuits
convert the data for transfer to an external device. The transmit process operates in a similar fashion in reverse order.
The transmitted signal is GFSK (Gaussian Frequency Shift Keying) modulated data that is amplified on the chip to yield a radiated
output of 0dBm. A power control signal for an external amplifier is provided.
The audio baseband processor (C1BB00001102) is a digital audio processor IC encompassing apt-XTM audio
compress/decompress algorithm for wireless transmission of crystal-clear CD quality audio data.
For digital transmission the analog audio signals are sampled at 48kHz and converted to 1.536Mbps digital data through an
external 16-bit stereo audio codec. The digitized data are apt-XTM 4:1 compressed to 384Kbps stream data for efficient
transmission. Redundancy bits for forward error correction (FEC), synchronization flags, and control signals for time-division
duplexing (TDD) are appended to form data frames for error-free transmission.
In the receiver(Slave), synchronization flags and control data are first detected from the input stream. FEC decoder corrects any
errors that may have been introduced during the transmission and produces error-free compressed audio data. The compressed
audio is decompressed into 16-bit stereo PCM audio data through digital signal processing blocks. External audio codec converts
the PCM data to 2-channel (left and right) analog audio signals.
The Tx/Rx controller is in charge of several functions such as radio channel setup, frequency hopping for interference reduction and
generation of control signal for TDD and external RF chip.
In audio mode, the transmitter(Master) can send additional 16Kbps digital data simultaneously with stereo audio data.
How much time delay to transmit audio in wireless?
Audio compression and decompression requires about 3ms. Total time delay can be calculated as follows: Total delay time = audio
compression time + transmitter operating time + receiver operating time + audio decompression time. Total delay time is
approximately 12.2ms.
What is the power consumption?
The 2.4GHz RF module consumes about 45mA (max 65mA) for the transmitter and 55mA (max 71mA) for the receiver. The
EEPROM consumes about 1mA while the baseband IC consumes about 20mA. The total power consumption is 66mA (max 86mA)
for the transmitter and 76mA (max 92mA) for the receiver.
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