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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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AUDIO SIGNAL PROCESSING sa AUDIO EQUALIZER sa AUDIO FILTER sa DELAY LINE sa SURROUND-SOUND PROCESSING x AUDIO COMPANDER x AUDIO COMPRESSOR x COMPANDER (AUDIO) x COMPRESSOR (AUDIO) x EXPANDER (AUDIO) x SIGNAL PROCESSING (AUDIO) x SOUND PROCESSING (AUDIO) xx AUDIO xx AUDIO EQUIPMENT Operation and uses for the 570/571 IC compander chip. Modifications for the dbx 117 or 119 compressor/expander. (1) Record while listening to expanded program material. (2) Add a tape monitor. Noise reduction systems. An introduction to the techniques of inhibiting unwanted noise in audio signals. Looks at both Dolby and the dbX compandor (compander). Includes construction details for the Compex compander built around the Signetics NE570/571 IC. Kit report on building the Integrex Dolby Noise Reducer, a full-function Dolby-B processor able to both encode and decode. Equipment review of the dbx Model 21 decoder for disks and tapes previously encoded with dbx-II characteristics. Report on Sound Concepts Model IR2200 "stereo image expander" kit. A two-channel tube compressor. This project features the superior sound of tubes, with a short signal path and versatile controls. DASP-2002 digital audio signal processor. Include this circuit in every S/PDIF link between two digital audio devices (CD player, DVD player, CD recorder, or MD recorder). It allows modification (bypassing) of the copybit and serves as a universal processor for digital audio signals. Programmable audio-level controller keeps a receiver's audio volume constant, regardless of incoming signal strength. Utilizes a compandor IC. Est. cost: $30. Volume expander circuit will give more impact to recorded music which requires a wide dynamic range. It helps overcome some of the effects of compression (especially in cassette recordings). VFX (voice effects processor) uses a DSP (digital signal processing) microcomputer. Audio special effects processor accepts microphone input, digitally processes the information in one of three modes (harmonizer, echo, reverb), and amplifies the output for listening with a speaker or headphones. Est. cost: $105 (kit). Audio expander. Enhance stereo and mono audio with this one-chip audio processor. Simulates stereo on mono, enhances stereo audio, helps restore old recordings, etc. Est. cost: $20 (kit). Build this stereo compressor (audio compressor) which limits the dynamic range of an audio signal. It is designed to automatically lower the audio "blasting" that goes with some TV commercials and hi-fi video recordings. Est. cost: $75 (kit). A universal stereo noise filter and compressor will reduce noise and increase clarity of any audio signal. Est. cost: $95 (kit). Stereo compressor for making a cassette copy of a compact disk. Use this device to restrict the dynamic range of compact disks and make cassette recordings that are suitable for use in an automobile or a "Walkman" unit. Basically, it makes the soft passages louder and the loud passages softer. Single-channel sound exploder. Simulates full stereo sound and control capabilities (reverberation enhancement, bass and treble boost and cut, channel balancing, and four-way fading) from a mono source. Can be cascaded to provide a four-channel surround-sound effect. Stereo compressor (audio compressor). Designed to lower the increased loudness of some TV commercials. Will also serve as a studio sound manipulator and to reduce the louder music and sound effects often found in film and TV. Est. cost: $75 (kit). Hi-fi volume compressor/extender. Distortionless speech compressor will automatically maintain the correct recording level for a tape recorder. Est. cost: $16. Distortionless audio compressor has a large range (45 dB or more) and accepts virtually any microphone input. Est. cost: $50. A simple compressor-expander circuit is a passive circuit which uses an LED to sample the audio output of system. Can be used as the volume control in an audio system or to prevent speaker blowout in musical instrument amplifiers. Versatile tape recorder control. This accessory unit adds audio compression, squelch-activated start and earphone amplifier to an existing cassette recorder. Build a "compander" to enhance hi-fi recordings. Provides either expansion or compression of sound. Expansion replaces the missing peaks which may be lost in recording and compression eliminates loud level changes. Audio signal delay unit is built around a MOS-type shift register. Makes for a livelier sound. Also used to simulate stereo from mono input when making tape recordings. Est. cost: $39 (mono); $59 (stereo). Special focus on audio. Dynamic noise reduction systems and expanders. Build an audio compander. A 2:1 and 1:2 compander will allow you to record the 115-dB range of live music on the 65-dB range of most tape recorders, then play it back without losing its original dynamic range. Est. cost: $59. Audio "listening-room" expanders. How time delay enhances sound reproduction. A buyer's guide to eight models. Performance comparisons. Audio time delay systems. Part 1. A low-cost analog audio delay line. Part 1. Provides adjustable delays and wide dynamic range. Estimated cost: $250. Audio time delay systems. Part 2. A low-cost analog audio delay line. Part 2. Power supply and construction information. Audio time delay systems. Part 3. Build a digital audio delay line. Uses computer-type RAM memory and both A/D and D/A converters. Peak unlimiter audio dynamic range processor. Increases system gain when passing peaks that may have been limited during the original recording process. Est. cost: $59. Enhancing stereo sound with signal processors. How to eliminate hiss and other noises, increase dynamic range, remove annoying frequency peaks, etc. A introduction to the techniques and equipment. Audio gate expands dynamic range and obtains effective noise reduction. Use to strip background noise, mute PA microphones, dup "clean" movie soundtracks, etc. Est. cost: $30. Signal conditioner circuit is ideal for cleaning up weak and noisy audio or Morse-code signals. May also be used to clean up digital tone signals in a remote-control extender circuit. Simple diode circuits. (1) Bridge rectifier. (2) Sound-level (audio signal) limiter circuit never exceeds 1.5-volts peak-to-peak. (3) DC polarity or AC indicator circuit. (4) Kick-back voltage limiter for inductive loads. (5) Steering circuit controls relays based on voltage polarity. (6) Simple temperature sensor. (7) Circuit for selecting matching diodes. Compression-type amplifier circuit that can be used to keep the volume level of an electronic organ constant. Special microphone incorporates an audio compressor and VOX circuit. It will turn on your recorder at the sound of a voice and keep the recording level automatically adjusted. Signal processors (audio time delay, dolby decoder, transient eliminator, etc.). How to connect them to your hi-fi system by using the tape monitor circuit. Build this combination hi-fi noise filter and dynamic range extender. Part 1. Build this combination hi-fi noise filter and dynamic range expander. Part 2. Build this stereo image expander. Part 1. The theory. Build this stereo image expander. Part 2. Construction. Est. cost: $95. Audio companding. You can build a professional-quality compander for your hi-fi system using circuits designed around Signetics' NE570 compander IC. A compander is used to reduce noise from your tape recordings and to bring back the dynamic range that is lost when recording and broadcast engineers compress their audio signals. Analog delay lines. Find out how to use analog delay lines to produce special audio effects such as echo, reverb, room expansion, etc. Signal processors. Part 1. Beginning a discussion on the relative roles and goals of various types of audio signal processors. Signal processors. Part 2. Equalizers. Signal processors. Part 3. Theory of stereo perception and the way that certain products can affect and enhance the stereo illusion. Four-transistor audio compressor boosts modulation. Est. cost: $10. | |||||||||
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