Digital reverb. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Digital technology
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The digital reverb is designed to create an echo effect by delaying the audio signal applied to the balanced modulator of the transceiver. The delayed low-frequency signal, optimally mixed with the main one, gives the transmitted signal a specific color, which improves intelligibility when conducting radio communications under interference conditions, makes it "pumped up" - it is believed that this reduces the crest factor. (But who would prove it to me? RW3AY) (The illusion of reducing the crest factor of speech appears due to the filling of the intervals between periods of the main tone of the speech, delayed in time by the same signal. (RX3AKT))
The reverb shown in Fig. 1 consists of a microphone and output summing amplifiers assembled on a K157UD2 dual operational amplifier, analog-to-digital (ADC) and digital-to-analog (DAC) converters - K554SAZ and K561TM2 microcircuits and a delay unit made on a K565RU5 microcircuit . In the address encoding scheme, K561IE10 and K561PS2 microcircuits are used.
(click to enlarge)
(click to enlarge)
The principle of operation of such a reverb was described in sufficient detail in [1,2,3].
Resistor R1, by changing the frequency of the clock generator, you can adjust the delay time. Resistors R2 and R3 select the depth and level of reverb, respectively. By manipulating these resistors, the performance of the entire reverb is optimized. Capacitors marked with (*) are used to achieve the best signal quality with minimum noise. Large distortions in the delayed signal indicate a faulty microcircuit in the address encoding unit. The reverb is assembled on a printed circuit board made of double-sided fiberglass 130x58 mm. After assembly and configuration, the board is placed in a metal shielding box of the appropriate size.
Literature
1. "To help the radio amateur" No. 95, p.29.
2. Magazine "Radio" No. 1 - 86, p.47
3. Journal "Radio amateur KB and VHF" September 1995, p.18
Author: G. Bragin, RZ4HK, Chapaevsk; Publication: N. Bolshakov, rf.atnn.ru
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