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Timewave DSP-59Y Operating Manual

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DSP-59Y
Audio Noise
Reduction Filter
Operating Manual
November 7, 1996

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Summary of Contents for Timewave DSP-59Y

  • Page 1 DSP-59Y Audio Noise Reduction Filter Operating Manual November 7, 1996...
  • Page 2 Serial Number You will need your serial number when communicating with Timewave Technology, Inc. The number is on the bottom of the DSP-59Y. It is also stored within the unit and is displayed when you power up your unit. Record your serial number on your registration form and here for future reference.
  • Page 3 Cables to connect DSP-59Y with your transceiver speaker output, PTT input, and optional multimode controller. All of these cables will need a RCA type connector on the end that attaches to the DSP-59Y. The other connector will vary with the equipment on the other end. Consult your owner’s manuals.
  • Page 4 Q ui c k Che c k  I n s t a l l a t i o n This page intentionally left blank. No v em b er 7 , 1 9 9 6...
  • Page 5 Table of Contents Quick Check What is packed with your DSP-59Y................iii What is not packed with your DSP-59Y that you will need ........iii Table of Contents 1  Installation Installation in Yaesu SP - 5/6 Extension Speaker............ 1-2 Tools You will Need:....................
  • Page 6 Q ui c k Che c k  T a b l e o f Co n t e n t s 2  DSP-59Y Introduction Digital Signal Processing..................2-1 DSP-59Y Overview ....................2-1 Signal Flow ......................2-2 Front Panel Controls....................2-3 Back Panel Connectors ...................
  • Page 7 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er 4  Voice Mode Operation......................... 4-1 High Pass/Low Pass Filters .................. 4-1 High Pass filter adjustment................. 4-1 Low Pass filter adjustment ................. 4-1 Noise Reduction ....................
  • Page 8 Q ui c k Che c k  T a b l e o f Co n t e n t s Data Operating Hints....................6-8 Data Primer ......................6-8 Frequency shift....................6-8 Center Frequency ....................6-8 Baud Rate ......................6-9 QRM Operating Hint ...................
  • Page 9 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Installation To install a DSP-59Y, the operator must have a Yaesu SP-5/6 external speaker and provide a power source for the DSP-59Y. The operator will need to install the DSP-59Y within the Yaesu SP-5/6 external speaker.
  • Page 10 1  I n s t a l l a t i on Installation in Yaesu SP - 5/6 Extension Speaker Tools You will Need: „ #1 Phillips Screwdriver „ Small flat blade screwdriver „ Small wire cutter „ Clear workspace Yaesu SP-5/6 External Speaker Preparation „...
  • Page 11 Response plate. Remove the screw and push the plate out from behind. Insert screw back into plate for storage. This plate is not used when the Timewave DSP-59Y is installed, but you may wish to keep the plate for referencing the Frequency Response Chart.
  • Page 12 Locate the speaker and the wires running from it. Carefully cut a cable tie that is around the speaker wire and two other wires. Take care not to nick or cut the insulation on the wires. DSP-59Y Installation The following step differs for the SP-5 and SP-6. Yaesu SP-5...
  • Page 13 Plug in the provided cable in its place DSP-59Y Preparation Remove the DSP-59Y from its packaging. Remove the eight screws that hold the top cover on the DSP-59Y. Set screws and cover aside. d io L in...
  • Page 14 59Y-054 Tip the DSP-59Y up and slide the unit into the front of the Yaesu SP- 5/6. Lower the front of DSP-59Y and slide the unit in. Press on the two screws that you loosened and slide DSP-59Y the rest of the way in. Do not force the unit.
  • Page 15 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Install provided 4-40x1/4 machine screw from inside top front of the DSP-59Y to lock front panel of unit in place. Tighten snugly - do not over tighten. Do not use the screw that you remove previously. It has metric tread.
  • Page 16 1   I n s t a l l a t i on Replace the top cover on the DSP-59Y. Slide the front portion of the cover on first slide on first and push it forward. The rear portion of the cover should then slide into place.
  • Page 17 Power Supply The DSP-59Y requires a power source of 12 to 16 Volts dc at 1.0 Ampere. The center pin of the power connector is POSITIVE (+). The DSP-59Y chassis is negative. The correct power plug size is 5.5 mm outside diameter and 2.1 mm inside diameter.
  • Page 18 DSP-59Y Inputs and Outputs The DSP-59Y uses two RCA phono jacks on the back of the filter for PTT switch, and line output. Use cables with RCA phono plugs on one end to connect to the DSP-59Y.
  • Page 19 DSP- 59Y with the default factory impedance. This should work for all radios. If you are using a high impedance source, you can configure the DSP-59Y for a high or low input impedance by moving a shorting jumper.
  • Page 20 1. Remove the eight screws holding the cover of the Yaesu SP-5/6 extension loudspeaker in place. Lift cover off the unit. 2. Remove the eight screws holding the top cover of the Timewave DSP- 59Y in place. 3. Slide cover off the DSP-59Y.
  • Page 21 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Audio Input Signal Level Setup Matching the output level of the radio to the input level of the DSP-59Y is necessary to take maximum advantage of the wide dynamic range of the DSP-59Y.
  • Page 22 Maximum voltage on PTT line is 25VDC. Some older linear amplifiers have 115 volt supplies for their transmit-receive relays. If a transceiver PTT line is used to key (short to ground) both the DSP-59Y and a older linear amplifier, an isolation relay must be used to prevent damage to the DSP-59Y (and any other solid state equipment connected to the PTT line).
  • Page 23 The 8 pin circular DIN connector (labeled Radio) on the back panel of the DSP-59Y is the only source for PTT, Key, and FSK output. It also has redundant line output, audio, and PTT input. It also has connections that are reserved for future options.
  • Page 24 This might be Setup Data necessary if you are connecting a high impedance device such DSP-59Y as a tape recorder to the DSP-59Y. These usually do not have Tune volume control. The range of adjustment is from +6.0 dBV to Mode /Sto -16.5 dBV in 1.5 dB steps.
  • Page 25 Voice Overload dBV in 1.5 dB steps. The factory default is -3.0 dBV. Normal 1. Press [Shift+Mode] to enter Setup mode. Setup Data DSP-59Y ,QVWDOO ,QVWDOO 2. Rotate Tune knob until appears on the Tune bottom line of the display...
  • Page 26 1  I n s t a l l a t i on 5HVHW 0HPRU\ 5HVHW 0HPRU\ 4. Rotate Tune knob until appears on the bottom left of the display 5. Press the [Ent/Clr] to select. 6. Rotate Tune knob until the chosen value appears on the bottom right of the display.
  • Page 27 This section includes a short summary of both the front panel controls and the rear panel connectors. It also provides an overview of the features found in the DSP-59Y. Please see Appendix A  Specifications for detailed information on the capabilities of the DSP-59Y.
  • Page 28 Front-panel selectable and adjustable inputs allow you to quickly setup and adjust your DSP-59Y to wipe out noise and QRM like never before! Here are a few more highlights among the many other operating features of...
  • Page 29 12. Overload/PTT LED Indicate the selected operating mode of the DSP- Red LED indicates a too high signal level into 59Y. DSP-59Y from receiver. When PTT line from 3. Rcl/Sto Button transceiver is connected, red LED on indicates PTT is activated.
  • Page 30 DB-9F connector. Refer to Yaesu front panel controlled cutoff filter and has chapter 1 for pin configuration. not passed through the Timewave DSP-59Y. 2 - 4 Nov e m b e r 7 , 1 9 9 6...
  • Page 31 /Clr 59Y-006 Random Noise Reduction The noise reduction functions of the DSP-59Y operate by examining a characteristic of signals and noise called correlation, and dynamically filtering out the undesired signals and noise. The degree of correlation is relative. Random noise such as white noise or static is uncorrelated. Speech is moderately correlated.
  • Page 32 Bypass Control The DSP-59Y has bypass features that vary with the mode of operation. In voice and CW modes, the bypass setting routes Timewave...
  • Page 33 The DSP-59Y highpass filter adjustment range is from 100 to 1000 Hz and the lowpass range is from 1000 to 5000 Hz. Nov e m b e r 7 , 1 9 9 6...
  • Page 34 2  DSP- 59Y I nt r oduct i on Random Noise Reduction The DSP-59Y random noise reduction has proven to be useful in reducing a wide variety of noise types, including white noise, line noise and static crashes. The amount of noise reduction varies according to the characteristics of the noise.
  • Page 35 CW signals simultaneously. Random Noise Reduction The DSP-59Y random noise reduction has proven to be useful in reducing a wide variety of noise types, including white noise, line noise and static crashes. The amount of noise reduction varies according to the characteristics of the noise.
  • Page 36 2   DSP- 59Y I nt r oduct i on CW Tone Pitch Shift A Timewave DSP unique feature found in the DSP-59Y is the Timewave ability to easily shift the CW tone pitch to another frequency. Voice Overload...
  • Page 37 This modem feature is designed for RTTY operation. It is not designed to be used as a TNC. RTTY Remodulator The DSP-59Y has another special data function for RTTY only. After passing through the optimized RTTY bandpass filter, a precision DSP- based FSK detector in the DSP-59Y demodulates the noisy incoming RTTY...
  • Page 38 AFSK generator. This remodulation process takes place entirely in the DSP-59Y. The precise clean tones from the RTTY AFSK remodulator can feed any analog multimode controller or TU via the DSP-59Y line audio output. Many analog RTTY demodulators have difficulty with noisy signals of varying amplitude, but virtually all of them can adequately demodulate the precise DSP AFSK generator output.
  • Page 39 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Œ Data Œ Input Select Œ Speaker Mute/Bypass Œ Œ Data Set Definitions „ About Setup You can find the serial number of the unit and the revision level of the firmware along with the copyright notice in this section.
  • Page 40 2  DSP- 59Y I nt r oduct i on 2 - 1 4 Nov e m b e r 7 , 1 9 9 6...
  • Page 41 Operation Basics Introduction The DSP-59Y provides you a well stocked toolbox of powerful tools. Each tool is designed to do a specific job and do it well. You need to carefully select the correct tool to fix the problem. Like any other toolbox, you should only use the tools you need.
  • Page 42 To recall a setting from memory, press [Rcl/Sto+{#}]. (# = a Normal digit in the range 1 to 6 printed in yellow letters above the Setup Data DSP-59Y corresponding key.) Tune If you start to store or recall a setting from memory and Mode...
  • Page 43 For example, press Setup Data [Rcl/Sto+3] to recall the memory 3 setting. Press [Rcl/Sto+ DSP-59Y Rcl/Sto] to restore the setting before memory 3 was recalled. Tune Press [Rcl/Sto+Rcl/Sto] again to restore the memory 3 Mode /Sto setting.
  • Page 44 Function Shift /Clr 59Y-020 Bypass [Byp/AGC] When you select [Byp/AGC], the other controls have no effect on the operation of the DSP-59Y. The LED next to the Timewave %\SDVVHG %\SDVVHG button and displayed on the bottom line of the Voice Overload LCD indicates that bypass is active.
  • Page 45 In the Gain process of maintaining the constant level, the signal processor Function can add up to 36 dB of gain to the DSP-59Y signal path. In some situations, this increased gain will also noticeably Shift /Clr increase the background noise level.
  • Page 46 /Clr 59Y-023 Power Switch/Gain Adjust Control The gain knob on the front panel of the DSP-59Y is the power switch/gain adjust control. Turning off or removing power from the DSP-59Y automatically de- energizes a bypass relay and forces the DSP-59Y into the bypass mode and the audio signal is passed directly to the speaker within the Yaesu SP-5/6.
  • Page 47 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Voice Mode Operation In Voice mode, the DSP-59Y conditions the audio response of the DSP-59Y using a combination of highpass filters and lowpass filters, adaptively reduces random noise, and adaptively eliminates multi-tone noise (heterodynes).
  • Page 48 DSP-59Y random noise reduction mode. It is important to try different AGC, input attenuator and RF gain settings on your receiver in addition to the DSP-59Y. Fast AGC with 10 - 20 dB of input signal attenuation usually helps prevent the receiver front end from overload and the AGC from desensing the receiver.
  • Page 49 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Heterodyne Elimination/Notch Filters The DSP-59Y has both an automatic and a manual tone notch filter to help remove interfering heterodynes, CW, and data Timewave signals.
  • Page 50 DSP-59Y directly to the Yaesu speaker and headphones Voice Overload and the line output jack. The Bypass mode has precedence Normal over the voice mode. When the DSP-59Y is in bypass, the Setup Data settings of the all other controls do not affect the signal. DSP-59Y...
  • Page 51 Function Shift /Clr 59Y-027 Signal Input Select You can select one of two inputs within the DSP-59Y. The choices are the Yaesu SP-5/6 loudspeaker inputs or the DIN Timewave connector labeled “Radio” on the rear of the DSP-59Y. The Voice Overload factory default is the speaker input.
  • Page 52 1. Press [Shift+Mode] to enter Setup mode. Normal   2. Rotate Tune knob until appears on the bottom Setup Data DSP-59Y line of the display Tune 3. Press [Ent/Clr] to accept. Mode /Sto           4.
  • Page 53 These functions can operate simultaneously or independently. The DSP-59Y also provides a marker tone at the center frequency of the selected CW bandpass filter. Center Frequency adjustment Press the Tune knob so the arrow in the upper right corner of the display points to the left.
  • Page 54 Automatic Gain Control. CW Operating Hint The extremely narrow linear phase filters in the DSP-59Y will allow you to copy very weak and closely spaced CW signals. Use 10 to 100 Hz bandwidths, but tune very slowly. Since many radios are difficult to tune slowly, use the bandpass center frequency control to help pick out the weak and closely spaced signals.
  • Page 55 „ To activate the marker tone for CW, press [Tone]. The DSP-59Y generates an audio tone at the bandpass filter center frequency. Use the marker to center a wide bandpass filter (300 - 600 Hz) on a signal by matching the marker tone pitch to signal pitch by ear. The tone can be set to within 2.5 Hz of any frequency from 200 Hz to 2150 Hz.
  • Page 56 To remove the pitch shift, press [Shift+Function]. Then press [Ent/Clr] to deactivate. CW Bypass Mode Press [Byp/AGC] to place the DSP-59Y into a bypass mode. In this mode, a relay connects the audio input jacks of the Timewave DSP-59Y directly to the Yaesu SP-5/6 speaker/headphone...
  • Page 57 3. Press the [Ent/Clr] key to select. Shift /Clr 59Y-030 Signal Input Select You can select one of two inputs within the DSP-59Y. The choices are the Yaesu SP-5/6 loudspeaker inputs or the DIN Timewave connector labeled “Radio” on the rear of the DSP-59Y. The Voice Overload factory default is the speaker input.
  • Page 58     1. Rotate Tune knob until appears on the Setup Data DSP-59Y bottom left of the display Tune 2. Press the [Ent/Clr] key to select. Mode /Sto 3. Rotate Tune knob until the chosen value appears on the...
  • Page 59 The baud rate, center frequency and frequency shift of a data signal determine the bandwidth of filter for that data signal. In the Data Filter mode, the DSP-59Y has an array of band- pass filters optimized for the most common high frequency (1.8-30 MHz) data modes.
  • Page 60 Normal display on. Setup Data Tune in a FSK data signal on the receiver connected to DSP-59Y the DSP-59Y. Tune Adjust the receiver frequency so that the Mark and Space Mode /Sto bars on the display are approximately equal length.
  • Page 61 AMTOR or PacTOR link to DSP-59Y lose synchronization. The bypass mode has precedence over Tune the Data mode. When the DSP-59Y is in bypass, the settings Mode /Sto of the gain control and the parameter select push buttons do not affect the signal.
  • Page 62 Normal operation for RTTY, AMTOR, SITOR, PacTOR and G-TOR uses a 2210 Hz center frequency filter in the USA. A 1360 Hz center frequency is common in Europe. The defaults used in your DSP-59Y can be chosen from within Setup - Install.
  • Page 63 Highpass and Lowpass filters to pass those frequencies. The linear phase response and steep skirts of DSP-59Y will help reject QRM and improve S/N ratio. If you don't know the frequency limits, tune in a strong signal with the Highpass and Lowpass filters set to 300 Hz and 2.7 kHz.
  • Page 64 The modem is operational whenever you are in one of the RTTY modes. You need, however, to have a computer connected to the RS-232 port on the DSP-59Y and have appropriate software terminal program that can decode and encode Baudot and ASCII.
  • Page 65 The LED illuminated next to the [Function] button indicates the RTTY remodulator is selected. The DSP-59Y filters and demodulates the received RTTY signal. Then The DSP-59Y generates a new set of RTTY tones that are modulated by the output of the RTTY demodulator.
  • Page 66 6  Da t a M od e When using the RTTY modem the process is similar. When the Tune knob indicator is pointing to the left, the Tune knob adjusts the Bandwidth. When the Tune knob indicator is pointing to the right, the Tune knob adjusts the Data Carrier Detect (DCD).
  • Page 67 RTTY, AMTOR, and PacTOR mark-space center frequencies. The DSP-59Y mark-space center frequency factory setting is 2210 Hz for RTTY, AMTOR, G-TOR and PacTOR data modes. The DSP-59Y HF Packet mark-space center frequency factory setting is 1700 Hz. The mark- space center frequencies of the modem, receiver and DSP-59Y must match.
  • Page 68 3. Press the [Ent/Clr] key to select. 59Y-036 Signal Input Select You can select one of two inputs within the DSP-59Y. The choices are the Yaesu SP-5/6 loudspeaker inputs or the DIN Timewave connector labeled “Radio” on the rear of the DSP-59Y. The...
  • Page 69 Normal 3. Press the [Ent/Clr] key to accept choice. Setup Data     DSP-59Y 4. Rotate Tune knob until appears on the bottom left of the display Tune Mode /Sto 5. Press the [Ent/Clr] key to accept choice.
  • Page 70 Normal 3. Press the [Ent/Clr] key to accept choice. Setup Data   DSP-59Y 4. Rotate Tune knob until appears on the bottom left of the display Tune Mode /Sto 5. Press the [Ent/Clr] key to accept choice.
  • Page 71 2350 Hz. Normal The choices for frequency shift are 170, 200, 425, and 850 Setup Data DSP-59Y Tune Baud rate choices are 45, 50, 57, 75, 100, 110, 150, 200, and Mode /Sto 300 baud.
  • Page 72 6   Da t a M od e 11. Rotate Tune knob until your next function to change appears on the bottom line of the display or press the [Shift+Ent/Clr] to return to main setup menu. Exit Setup When you are through with Setup, press [Mode] to return to Voice mode. 6 - 1 4 No v em b er 7 , 1 9 9 6...
  • Page 73 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Troubleshooting Most of the functions of the DSP-59Y can be checked using the LCD display, the LEDs, and your ears.
  • Page 74 2. Increase audio input level with receiver audio output level control until the "Normal" LED flashes. 3. Bypass the DSP-59Y by turning it off. Verify the audio level out of the radio by listening to the speaker. If nothing is heard, plug a set of stereo headphones into the front panel headphone jack.
  • Page 75 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er It still does not work! If the DSP-59Y does not seem to work correctly after carefully following the installation, operation and troubleshooting instructions in this manual, call, write, E-mail or FAX the Timewave Customer Service Department for additional help.
  • Page 76 7  Tr oubl e sh oo t i ng 7 - 4 No v em b er 7 , 1 9 9 6...
  • Page 77 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Appendix A Specifications AUDIO INPUT Impedance 20 K ohms or 25 ohms, jumper selectable input signal range for full 10 mV to 1.0 volt, front panel programmable output AUDIO OUTPUT...
  • Page 78 Ap p e n d i x A Sp e c i f i c a t i o n s RTTY MODEM Shifts 170, 200, 425, 850 Hz Data Rates 45, 50, 57, 75 Baud Input Audio from receiver. Output Open collector FSK and variable level AFSK Transmit Data...
  • Page 79 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Appendix B Glossary AFSK (Audio Frequency Shift Keying) FSK (Frequency Shift Keying) A common RTTY mode most often used for VHF and A common RTTY mode most often used for HF UHF communications.
  • Page 80 Slow-Scan TV is a narrow bandwidth image mode Weather facsimile image format. There are two popular on the HF bands that transmits pictures at 8, modes HF and satellite. The DSP-59Y currently 16 or 32 seconds per frame. supports only HF mode Detailed information on satellite mode can be found in The Weather Satellite Handbook published by the ARRL.
  • Page 81 Timewave software and firmware products which are designated by Timewave for use with a hardware product are warranted not to fail to execute their programming instructions due to defects in materials and workmanship. If Timewave receives notice of such defects during the...
  • Page 82 Ap p e n d i x C Pr oduct Wa r r a nt y A - 6 Nov e m b e r 7 , 1 9 9 6...
  • Page 83 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Appendix D Electromagnetic Interference To maintain the integrity of the EMI prevention measures in this unit, it is important to replace all hardware if the unit is reassembled after opening the housing.
  • Page 84 Ap p e n d i x D El e c t r o m a g n e t i c I nt e r f e r e n c e A - 8 Nov e m b e r 7 , 1 9 9 6...
  • Page 85 Schematic Diagrams The schematic diagrams in this manual may differ slightly from any particular DSP-59Y. Timewave reserves the right to make changes in the DSP-59Y at any time. Nov e m b e r 7 , 1 9 9 6...
  • Page 86 Ap p e n d i x E Sc h e m a t i c Di a g r a m s A - 1 0 Nov e m b e r 7 , 1 9 9 6...
  • Page 87 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Nov e m b e r 7 , 1 9 9 6 A - 1 1...
  • Page 88 Ap p e n d i x E Sc h e m a t i c Di a g r a m s A - 1 2 Nov e m b e r 7 , 1 9 9 6...
  • Page 89 DSP - 5 9Y Aud i o No i se Re d u ct i o n F i l t er Nov e m b e r 7 , 1 9 9 6 A - 1 3...
  • Page 90 Ap p e n d i x E Sc h e m a t i c Di a g r a m s A - 1 4 Nov e m b e r 7 , 1 9 9 6...