JPS591280Y2 - reverberation device - Google Patents

Description

[Detailed description of the invention] This invention relates to a reverberation adding device, and its purpose is to cut off the noise generated in the reverberation section when the original signal of the signal source drops below a certain level, thereby eliminating discomfort. It is in.

Recently, for example, in magnetic recording and playback devices, reverberation adding devices are often used, such as installing a reverberation section in the microphone signal path to record reverberation, or adding reverberation to the microphone during playback and mixing this with the tape playback signal. It is being

However, there is a drawback that the noise generated in the reverberation section itself makes the sound extremely unpleasant due to the reverberation effect.

In particular, the lower the level of the original signal, the more noticeable the noise in the reverberant section was, giving a very unpleasant feeling.

The present invention improves the above-mentioned drawbacks by adding reverberation when the original signal exceeds a certain level, and preventing noise from the reverberation section from being output when there is no signal.

FIG. 1 shows an embodiment of the basic configuration of the present invention.

The reverberation section 2 is composed of an electronic delay circuit including a charge transfer element such as a packet, a bridge gate, a device, etc., and generates a reverberation signal that exponentially attenuates the original signal from the signal source 1 over time.

The mixing section 3 includes a variable resistor 301 and a resistor 302 connected in series with the variable resistor 301, and is connected in parallel with the reverberation section 2 to combine the original signal and the reverberation signal.

Then, connect the movable terminal of the variable resistor 301 to terminal 3 on the input side.
Rotating it toward the 03 side increases the ratio between the original signal and the reverberant signal, and rotating it toward the opposite side decreases the ratio between the original signal and the reverberant signal.

This allows you to manually adjust the reverberation rate.
Aurally, it sounds like the reverberation time has changed.

The muting section 4 includes a diode 401. capacitor 4
02. Resistor 403. Power supply 404 and transistor 4
05, the cathode side of the diode 401 is connected to the signal source 1, and the collector of the transistor 405 is connected to the output side of the reverberation section 2. When the original signal from the signal source 1 is large, the transistor 405 is cut off, and the signal is When there is no output from source 1, that is, when there is no signal, transistor 4
05 is set to be in a conductive state.

And capacitor 402. The response speed of the transistor 405 is determined by the charging/discharging time of the resistor 403, and the unnaturalness of the reverberant signal when the transistor 405 is switched between conduction and cut-off states is eliminated.

Now, when the original signal from the signal source 1 is large enough, the transistor 405 is cut off, so the variable resistor 30
The signal at the output terminal 5 connected to the movable terminal 1 is a combination of the original signal S and the reverberation signal by the variable resistor 301, as shown in FIG.

The magnitude of the reverberation signal with respect to the original signal S can be changed as shown in a, l), and c by the variable resistor 301.

When the original signal becomes zero from the above state, the transistor 405 becomes conductive, and the noise generated in the reverberation section 2 itself is no longer supplied to the mixing section 3.

As a result, unpleasant noise caused by the internal noise of the reverberation section 2 is not outputted to the output terminal 5.

Next, when a signal is applied again from signal source 1, transistor 405 is instantaneously turned off.

Then, the original signal from the signal source 1 and the reverberation signal from the reverberation section 2 are combined in the mixing section 3 and output to the output terminal 5.
A signal as shown in the figure is output.

Note that if the magnitude of the reverberation signal is to be constant, the variable resistor may be a fixed resistor, and the transistor 405
Even if the collector terminal of is directly connected to the output terminal 5, similar effects can be obtained.

As described above, according to the reverberation adding device of the present invention, the reverberation section is configured with an electronic delay circuit including a charge transfer element, and the muting section is configured to control opening/closing of transmission of the reverberation signal in the reverberation section depending on the level of the original signal. When the original signal is above a set level, the original signal and the reverberant signal are mixed and output, and when the original signal is below the set level, the reverberant signal is muted. It is possible to achieve an excellent effect of not outputting internal noise caused by a transfer element etc. when the original signal is below a set level, thereby preventing unpleasant noise from being heard.

[Brief explanation of the drawing]

Fig. 1 is a basic circuit configuration diagram showing an embodiment of the present invention;
The figure is a diagram showing the relationship between the original signal and the reverberation signal. 1... Signal source, 2... Reverberation section, 3...
...Mixing section, 4...Muting section, 5...Output terminal.

Claims (1)

[Scope of utility model registration request] a reverberation section for adding reverberation to the original signal; a mixing section for synthesizing the original signal and the reverberation signal from the reverberation section; an output terminal to which the output of the mixing section is supplied; and a reverberation section for adding reverberation to the original signal. The reverberation section is configured with an electronic delay circuit including a charge transfer element, and mixes the original signal and the reverberation signal when the original signal exceeds a set level. A reverberation device, characterized in that the reverberation device is configured to mute the reverberation signal when the original signal becomes lower than a set level by supplying the reverberation signal to the output terminal.