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Timewave DSP-599zx Features

Audio noise reduction filter
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DSP-599zx
Audio Noise
Reduction Filter
Features
Revision 1.1

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Summary of Contents for Timewave DSP-599zx

  • Page 1 DSP-599zx Audio Noise Reduction Filter Features Revision 1.1...
  • Page 2 Updates and corrections to information and specifications will be made to this Features Manual when needed. Copyright © 1994, 1995, 1996 by Timewave Technology Inc. All rights reserved. Printed in USA Under the copyright laws, this manual can’t be reproduced in any form without prior written permission from Timewave Technology Inc.

  • Page 3: Front Panel

    9. Random switch Red LED indicates a too high signal level into Used to turn on random noise reduction. Press DSP-599zx from receiver. When PTT line from [Shift+Random] to activate variable noise transceiver is connected, red LED on indicates reduction.

  • Page 4: Back Panel

    T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r Connectors Timewave Technology Inc. St. Paul, Minnesota USA.
  • Page 5 T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r Typical Transceiver PTT Out Ext Sp See your Operator Manual for specific information about PTT output connections DSP-599zx Timewave Technology Inc. St. Paul, Minnesota USA. Audio Line Speaker Power Radio A Radio B Headphones...

  • Page 6: Voice Mode

    Voice Mode Time Voice Data Test Setup Mode Bypass Tone Spkr/Chan Random DSP-599zx High Pass Rcl/Store Shift Function Center Freq 599-006 Typical display for Voice mode, 300 Hz to 2700 Hz filter, A channel active and speaker on. CW Mode Time...

  • Page 7: Dsp-599Zx Introduction

    T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r DSP-599zx Introduction The previous section includes a short summary of both the front panel controls and the rear panel connectors. Please see DSP-599zx Specifications at the rear of this document for detailed information on the capabilities of the DSP-599zx.

  • Page 8: Dsp-599Zx Overview

    Front-panel selectable and adjustable inputs allow you to quickly setup and adjust your DSP-599zx to wipe out noise and QRM like never before! Here are a few more highlights among the many other operating features of...

  • Page 9: Signal Flow

    T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r Signal Flow The DSP-599zx converts analog signals into digital signals before it routes and processes them. The digital signal processor also controls the front panel switches, encoders, LEDs, LCD display, and back panel inputs and outputs.

  • Page 10: Features Common To All Modes

    CW signals and heterodynes. Dual Channel Operation The DSP-599zx is a dual channel device with two sets of inputs and outputs. The DSP circuit completely processes the selected channel, while signals on the other channel pass through the DSP circuit without processing.

  • Page 11: Visible Memories

    The DSP-599zx requires external speakers and/or headphones to hear the audio signal. The DSP-599zx will accept either stereo or mono head-phones with a 1/4” plug. Stereo headphones are the preferred over monaural head- phones so that you monitor both output channels simultaneously.

  • Page 12: Automatic Gain Control

    In voice and CW modes, the bypass setting routes the signal through relay contacts to completely bypass the electronic circuitry of the DSP-599zx. Turning the power off to DSP-599zx uses the same relay bypass method. In data mode, the bypass route is through the DSP processor. The amount of signal delay through the bypass route is equal to the delay through the processed signal route.

  • Page 13: Operating Modes

    T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r Operating Modes The DSP-599zx has three normal operating modes that operators will most often use:...
  • Page 14 The DSP-599zx highpass filter adjustment range is from 100 to 1000 Hz and the lowpass range is from 1000 to 5000 Hz. Although the DSP-599zx bandpass filters for CW and the most common data modes, the selectable highpass and lowpass filter combinations also allow precise filtering for modes such as wideshift RTTY.

  • Page 15: Bandpass Filters

    599-007 Bandpass Filters The DSP-599zx has a fully tunable bandpass filter for use in the CW mode. The LCD display shows the center frequency and bandwidth of the filter as the operator tunes with front panel controls. Narrow band signals like CW and RTTY require a bandpass filter with steep skirts and linear phase response.

  • Page 16: Manual Notch Filtering

    CW Tone Pitch Shift A feature unique to the DSP-599zx is the ability to easily shift the CW tone pitch to another frequency. This feature works well with receivers that have non-adjustable, relatively high pitch CW tone, since most hams prefer to listen to 400 - 600 Hz CW tones.
  • Page 17 Center Freq 599-029 Bandpass Filters The DSP-599zx has both fixed and tunable bandpass filters for the data mode. Narrow band FSK signals like RTTY require a bandpass filter with steep skirts, linear phase response, and matched amplitude response. Linear phase response maximizes the usable signaling rate for a given bandwidth and minimizes ringing often heard on extremely sharp filters.
  • Page 18 A software terminal program that can decode and encode Baudot and ASCII code needs to be installed on the computer connected to the DSP-599zx. Timewave does not provide the terminal program. This modem is for RTTY operation only with signaling rates at 75 Baud or less.
  • Page 19 AFSK generator. This remodulation process takes place entirely in the DSP-599zx. The precise clean tones from the RTTY AFSK remodulator can feed any analog multimode controller or TU via the DSP-599zx 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 20: Test Instrument Mode

    Do not attempt to measure any voltage above 2000 millivolts, especially 115 Vac or 220 Vac power line voltage! You will damage the DSP-599zx! ALL WARRANTIES WILL BE VOID! Audio Signal Generator This mode produces tunable low-distortion, precision frequency sine wave test signals from 20 Hz to 10 kHz in 10 Hz steps.
  • Page 21 CTCSS tone received. The second is the tone squelch mode which detects a selected CTCSS tone and activates a switch output on the DSP-599zx as well as generates a tone on the selected CTCSS frequency. The audio millivoltmeter function displays the peak amplitude of the selected incoming CTCSS tone.

  • Page 22: Dsp-599Zx Specifications

    T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r DSP-599zx Specifications AUDIO INPUT A & B...

  • Page 23: Signal Processing

    T i m e wa v e DSP- 5 9 9 zx Au d i o No i s e Re d u c t i o n F i l t e r RTTY MODEM Shifts 170, 200, 425, 850 Hz Data Rates 45, 50, 57, 75 Baud Input...

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