DE2447226A1 - Electronic delay line for producing echos and reverberations - converts analog samples into digital for stored and delayed read-out and re conversion - Google Patents

Abstract

The electronic delay line, for producing echos and reverberations, samples the analog LF signal periodically at 0.05 msec. intervals and converts the sample into a digital signal using an A/D converter. These digital signals are stored one after another in a memory and are read out at given delay intervals. These read-out, delayed signals are reconverted by a D/A converter into analog signals. The delay times are not fixed but are free to alter periodically to give phase vibration and phasing. The advantage of the electronic delay line lies in its avoiding the disadvantages of the bucket-brigade types.

Description

The invention relates to a delay line for low frequencies Signals where the required delay is entirely electronic Means is achieved.

It is known to produce an echo and reverberation effect Store the sound signal by means of mechanical or electro-mechanical devices and thereby delay. (Torsionsietder, Hali plate, magnetic tape recorder, egg magnetic plate) These methods have the following disadvantages: - with torsion springs and Hall plates: sensitivity to vibrations, small and unbalanced frequency response, hum sensitivity.

- for magnetic tape recorders and magnetic disks: high maintenance requirements for Tape, tape head, motor; high proportion of noise.

An additional disadvantage of both methods is that the delay time is not continuously adjustable from 0 to maximum.

It is also known to use the analog signal in so-called bucket chains to be delayed purely electronically. Disadvantages: very short delay time, bad Dynamics, poor signal-to-noise ratio.

The invention is based on the pure analog signal to be delayed to store electronically without the listed disadvantages of the Simerkettenspeicher to take over.

The object is achieved according to the invention in that the analog signal (1) is periodically patterned in a simple ana hold module (2) by an analog / digital X; andler (3) is encoded into a digital signal (4) and then by one or more Memory blocks (5,6) and again after a defined delay time is delivered.

The delayed digital signal can then be followed by anyone at will Memory block removed and transferred to the original analog signal (9,10) can be converted back. Then it can LF signal can be mixed back to input (1) or fed to output t11) will.

The process is controlled by a clock generator (12).

The delay time (T) depends on the clock frequency (f), the number of available memory locations (s) and the number of parallel bits (n) that the analog signal is converted from.

By modulating the sampling frequency one can adjust the delay time vary as desired and thus receive a phase and frequency modulation of the transmitted data These effects are known as phase vibrato and phasing.

Claims (2)

Claims Electrical delay line for echo and reverberation generation, thereby characterized in that the analog LF signal is periodically patterned at least every 0.05 ms and converted into digital information in a known manner by means of an A / D converter is read into one or more digital memories connected in series is and is read out again after a certain delay time and in known Way into the original analog signal by means of one or more D / A converters is converted back. 2) delay line according to claim 1, characterized in that the delay time is not permanently set, but is changed periodically, in order to generate phase vibrato and phasing. Blank page