JPH0134239Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound effect device that extracts a part of an original signal, delays it, and obtains reverberation by combining the delayed signal and the original signal.

As this type of sound effect device, the one shown in FIG. 1 is conventionally known. Here, a part of the original signal is taken into a delay circuit (BBD element) 3 via a buffer amplifier 1, and subjected to delay control based on the oscillation frequency of a clock generator 2. Then, extra harmonic components such as the clock frequency generated by the clock generator 2 are removed by the low-pass filter 4, enter the mixing circuit 7 via the variable volume 6, and are combined with the original signal from the buffer amplifier 1. Output. In this case, the clock generator 2 is subjected to variable control of its oscillation frequency by the variable volume 5, and the variable volume 6 arbitrarily sets the mixing amount of the delay signal. This method simply combines the delayed signal with the original signal and outputs it with a delay time determined by the clock frequency set by the variable volume control 5, so it has the disadvantage of not producing a reverberation effect and lacking a sense of realism. .

The present invention was developed based on the above circumstances, and it enables delay control of the corresponding band signal components according to band changes of the original signal, and provides acoustic effects that provide a sufficient sense of presence and depth. The aim is to provide equipment.

For this purpose, the present invention includes a voltage control circuit that outputs a control signal according to the original signal level, and a variable cut-off frequency that is prepared to divide the output signal of the voltage control circuit into two input signals of the original signal. It is characterized by comprising a controlled high-pass filter and low-pass filter, and a synthesis circuit that synthesizes an output signal outputted through the high-pass filter and an output signal outputted through the low-pass filter and delay circuit. be.

Hereinafter, one embodiment of the present invention will be explained in detail with reference to FIG. In the figure, reference numeral 8 denotes a buffer amplifier into which the original signal is input, and its output signal is passed through a voltage-controlled low-pass filter 9 and a voltage-controlled high-pass filter 10 to the mixing circuit 1.
6. In this case, the low pass filter 9
The signal transmitted via the delay circuit (BBD element) 12 has a delay time determined by the clock generator 11 whose oscillation frequency is arbitrarily set by the variable volume control 14.
, and the clock generator 1
A low-pass filter 13 removes unnecessary harmonic components such as those generated by the clock frequency. The amount of mixing of the delayed signal with respect to the signal input to the mixing circuit 16 via the high-pass filter 9 is controlled by the variable volume control 15.

Then, the output signal of the buffer amplifier 8 enters the voltage control circuit 17, and with the output signal, both the filters 9 and 10 are subjected to level control of the same cutoff frequency.

In such a configuration, the cutoff frequency level changes due to variations in the output signal level of the original signal, and the band of the delayed signal component changes. For example, when the level of the original signal is low, the frequency band of the delayed signal component changes. Control of the delayed signal is realized by lowering the band frequency of the signal and increasing it when it is high.

Although the above embodiment shows the case of one channel, it may be used for multi-channel, and as shown in FIG. 3, the outputs of the low-pass filter 9 and high-pass filter 10 are
The switching means 18 may be used to reverse the switching.

As described in detail above, the present invention variably controls the cut-off frequency level of the delayed signal and the undelayed signal based on the level fluctuation of the original signal, so that the sound of the synthesized output signal can have sufficient presence and depth. It can be made to have a feeling.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is a block diagram of main parts showing another embodiment. 8... Buffer amplifier, 9... Low pass filter, 10... High pass filter, 11... Clock generator, 12... Delay circuit, 13... Low pass filter, 14, 15... Variable volume,
16...Mixing circuit, 17...Voltage control circuit.

Claims (1)

[Scope of utility model registration request] A voltage control circuit that outputs a control signal according to the original signal level, and a high-pass filter and a low-pass filter that have the same cutoff frequency variably controlled and are prepared to divide the original signal into two input signals using the output signal of the voltage control circuit. and a synthesis circuit that synthesizes an output signal output through a high-pass filter and an output signal output through a low-pass filter and a delay circuit.