JPS5939290Y2 - Audio signal editing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio signal editing device suitable for audio equipment such as a tape recorder or a talkie projector, which has two recording and reproducing systems for recording and reproducing audio signals.

In audio equipment such as tape recorders and talkie projectors, buttons are widely used in which the recording and reproducing system is configured with two paths, that is, two channels, in order to mainly record and reproduce audio signals in a stereo system.

Normally, in this kind of configuration, in order to perform editing such as adding another audio signal such as a narration by mixing to one or both audio signals passing through the recording and reproducing path, it is necessary to add another audio signal to the recording and reproducing path. In addition to connecting an audio signal input terminal for adding an audio signal, it is necessary to interpose various switches in response to editing operations between the image recording and reproducing circuits.

For this reason, in general, audio equipment equipped with editing functions such as mixing have significantly more complex circuit configurations than ordinary audio equipment without such editing functions, and also requires more troublesome switching of the various switches mentioned above. Amateurs were not necessarily satisfied with the operability, as it was inevitable that they would be operated.

On the other hand, the present invention provides an audio signal editing device that can reliably perform various kinds of editing including the above-mentioned mixing with extremely simple operations, and can also achieve the editing function by simply adding a circuit with a simple configuration. It is.

In particular, in the present device, a photoelectric element, which is a variable resistance element, is interposed between the recording and reproducing path through which an audio signal passes, and a change in the resistance value of the photoelectric element is used to turn on or off a light emitting element optically coupled to the photoelectric element. Since the recording and reproducing circuits are controlled by a controller, it is possible to easily connect and disconnect the recording and reproducing paths for editing such as mixing by controlling the light emitting elements to turn on or off.

Furthermore, in the present configuration, by controlling the lighting or extinguishing of the light emitting element via an editing switch that can be switched in accordance with an editing operation, the audio signal passing through one recording/reproducing path is transferred to the other recording/reproducing path. Special editing methods such as transferring to the playback system can also be easily adopted.

Furthermore, in the configuration of the present invention, the photoelectric element interposed between the recording and reproducing path has a different effect from the well-known on/off type switch. By providing a constant circuit, it is possible to perform seven-editing control on the audio signal during editing, and noise such as click signals can be reliably removed.

Hereinafter, one embodiment of the audio signal editing apparatus of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a first recording/reproducing path 1 includes an amplifier 2,
3, 4, an equalizer 5, a high frequency signal generator 6, and a variable resistor 7.

The first recording/reproducing path 1 is connected to a microphone 11, a speaker 12, and a recording/reproducing magnetic head 13 via switches 8, 9, and 10, respectively.

On the other hand, the second recording/reproducing path 14 has the same configuration as the first recording/reproducing path 1, namely, an amplifier 15° 16.17, an equalizer 18, a high frequency signal generator 19, and a variable resistor 20. They are connected to a microphone 24, a speaker 25, and a recording/reproducing magnetic head 26 via switches 21, 22, and 23, respectively.

Amplifiers 2 for the first and second recording and reproducing paths 1 and 14;
Audio signal input terminals 27 and 28 for mixing and adding audio signals such as narration are connected to terminals A and B between the amplifier 15 and the amplifier 3 and 16 via switches 29 and 30.

Further, a photoelectric element 31 such as a CDS is connected between the A and B terminals.

In particular, the photoelectric element 31 constitutes a well-known optical coupling element with a light emitting element 33 such as a light emitting diode, which is controlled to be turned on or off by a control circuit 32, and its resistance value is variably controlled by turning on or turning off the light emitting element 330.

The control circuit 32 includes editing switches 34 and 35 connected to a power supply terminal, and a well-known time constant circuit 39 consisting of a switch 36, a resistor 37, and a capacitor 38.

The level display circuit 40 includes the recording/reproducing magnetic head 13.
It is for displaying the recording level when an audio signal is recorded at .degree.
3.26 is connected via a switch 43.

FIG. 2 shows another embodiment regarding the main part of FIG. 1, but it differs from the embodiment in FIG. I have to.

Incidentally, in each of the switches 8 to 10 degrees and 21 to 23 shown in FIGS. 1 and 2, the movable contacts are fixed contacts P.

This is for recording and reproducing audio signals by switching and connecting to R.

In addition, the editing switch 35 changes the movable contact to a fixed contact (STER
EO).

By switching to (SWS) and (SO8), it is possible to reproduce the audio signal in stereo, and also to edit using the sound quiz sound and sound-on-sound method.

In order to record a stereo audio signal in the proposed device having the above configuration, first switch 8 to 1 is turned on.
Switch and connect each of the movable contacts 0.21 to 23 to the fixed contact R and press the button.

Under this condition, the audio signal applied from the microphone 11 passes through the switch 8, the amplifiers 2, 3, and 4 of the first recording/reproducing path 1, the switch 9, the equalizer 5, the variable resistor 7, and the switch 10. It is added to the recording/reproducing magnetic head 13.

Similarly, the audio signal applied from the microphone 24 is transmitted to the switch 21 and the amplifier 1 of the second recording/reproducing path 14.
5°16.1γ, is applied to the recording/reproducing magnetic head 26 via an equalizer 18, a variable resistor 20, and a switch 23.

Of course, since a bias signal is applied to the magnetic head 13, 26 from the high frequency signal generators 6, 19, the audio signal is recorded on the magnetic track as left and right signals.

Further, as mentioned above, the switches 8 to 10 and 21 to 2 are used to reproduce audio signals recorded in stereo.
This is done by switching and connecting the three movable contacts to the fixed contact PK.

Under this condition, the audio signal on the magnetic track picked up by the recording/reproducing magnetic head 13.26 is sent to the speaker 12 via the switch 8, the amplifier 2.3.4, and the switch 9. 21, speaker 25 via amplifiers 15, 16° 17 and switch 22
and played in stereo.

Next, a case will be described in which an editing method is implemented in which an audio signal passing through one of the first and second recording/reproducing paths 1 and 140 is transferred to the other path.

Editing for transferring audio signals is performed when an audio signal recorded only on one of two magnetic tracks is recorded on the other magnetic track, or when a single audio signal is transferred between two magnetic tracks. This is particularly advantageous when simultaneously recording or when a single audio signal is played back simultaneously by two speakers, and can be performed with the control circuit 320 and editing switch 34 closed.

That is, in this state, since the light emitting element 33 is lit, the resistance value of the photoelectric element 31 connected between the A and B terminals of both recording and reproducing thread paths 1 and 14 is zero. .

1. In this state, for example, if the movable contacts of switches 8 to 10 are connected to the fixed contact PIC1 or the movable contacts of switches 21 to 23 are connected to the fixed contact R, the audio signal pre-recorded on the magnetic track will be transferred to the magnetic head 13. After being reproduced in Since the audio signal is applied to the amplifier 16 of the path 14, the audio signal is reproduced by the speaker 12 while being transferred and recorded onto another magnetic track by the magnetic head 26.

Furthermore, if the movable contacts of the switches 8 to 10 and 21 to 23 are connected to the fixed contact R and the button is pressed under the light-emitting element 330 lighting condition described above, the audio signal applied from the microphone 14 will be transmitted to the switch 8 and the amplifier. It is applied to the amplifier 3 of the first recording/reproducing path 1 through the amplifier 2, and at the same time, to the amplifier 16 of the second recording/reproducing path 14 via the photoelectric element 31, and is applied to the amplifier 16 of the second recording/reproducing path 14 by the magnetic head 13.26. Each is recorded on a different magnetic track.

Now, even if the above-mentioned audio signal is added from the microphone 24 instead of the microphone 110, the same editing and recording as described above is possible.

Also, if the movable contacts of the switches 8 to 10, 21 to 23 are connected to the fixed contacts PK, the recording/reproducing magnetic head 13,
Audio signals picked up from either speaker 26 can be played back by both speakers 12 and 25 simultaneously.

Also, a case will be described in which editing is performed using the so-called sound-on-sound method in which another audio signal is mixed and recorded on one of the first and second recording/reproducing paths 1 and 14.

Such editing is advantageous when performing narration or the like on an audio signal previously recorded on a single magnetic track. Fixed contact (S
This can be done under the condition that the connection is switched to O8).

In particular, when the button is pressed in this state, the light emitting element 33 lights up and the resistance value of the photoelectric element 31 becomes zero, and at least the switch 29 of the audio signal input terminal 27 closes in response to the switching operation of the editing switch 35. Therefore, for example, if the movable contacts of switches 8 to 10 are connected to fixed contact P and the movable contacts of switches 21 to 23 are connected to fixed contact R, audio signals such as narrations applied from audio signal input terminal 2γ will be The signal is mixed with the audio signal picked up by the magnetic head 13 and added to the second recording/reproducing path 14, where it is recorded by the magnetic head 26.

Of course, editing records can be recorded using the audio signal input terminal 28.
If the movable contacts of the switches 8 to 10 are connected to the fixed contact R and the movable contacts of the switches 21 to 23 are connected to the fixed contact P with the switch 30 closed, the audio signal input terminal 28 The audio signal and the audio signal picked up by the magnetic head 26 are mixed, applied to the first recording/reproducing path 1, and recorded by the magnetic head 13.

Furthermore, when editing the audio signal of one of the first and second recording and reproducing paths 1 and 14 using the so-called sound quiz sound method, in which another audio signal is recorded in the other path. In this case, the editing can be performed with the editing switch 34 of the control circuit 320 open and the movable contact of the editing switch 35 connected to the fixed contact (SWS).

Particularly under this condition, the switch 36 is normally open and the light emitting element 33 is off, so the resistance value of the photoelectric element 31 becomes infinitely large, and the first and second recording/reproducing paths 1
, 14 are circuit-blocked.

Also, at this time, since at least the switch 29 of the audio signal input terminal 27 is closed in response to the switching operation of the editing switch 35, for example, the movable contacts of switches 8 to 10 are changed to fixed contacts R, and the movable contacts of switches 21 to 23 are closed. If the contact is connected to the fixed contact P, the audio signal input terminal 2
The audio signal such as narration added from 7 is the first
It can be applied to the magnetic head 13 via the recording/reproducing path 1.

During editing and recording, the audio signals recorded on another magnetic track are simultaneously monitored and reproduced via the second recording/reproducing path 14.

As is clear from the above, according to the present device, the connection and separation between the first and second recording/reproducing paths 1 and 14 is performed by optical coupling elements, so the circuit configuration itself can be significantly simplified, and various editing methods can be used for editing. Since it can be easily selected using a switch, it is extremely effective in practice.

In addition, the control circuit 320 and the time constant circuit 39 are connected to the editing switch 3.
This is to delay the lighting and extinguishing control of the light emitting element 330 associated with the operation of 4.35, and generates a click signal by fading the engagement and separation of the first and second recording/reproducing paths 1 and 14. It is possible to eliminate the occurrence of noise such as

Further, the switch 36 in the control circuit 32 is for connecting the first and second recording and reproducing paths 1 and 14 in a circuit manner when recording and reproducing audio signals in a method other than the stereo system.
When the switch 36 is closed it allows a single audio signal to be recorded by the magnetic head 13.26 and reproduced by the loudspeakers 12,25.

Further, although the level display circuit 40 is for detecting the level of the audio signal recorded by either of the recording/reproducing magnetic heads 13 and 26 via the switch 43, a similar level display circuit may also be provided. Accordingly, the level of the audio signal recorded by each magnetic head 13.26 may be detected independently.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present device,
FIG. 2 is a circuit configuration diagram in which the main configuration of FIG. 1 is partially modified. 1: first recording and reproducing system path, 14: second recording and reproducing system path,
27.28: audio signal input terminal, 31: photoelectric element, 32: control circuit, 33: light emitting element, 34, 35: editing switch.

Claims (1)

[Scope of utility model registration request] An audio signal for mixing and adding another audio signal to the audio signal to one or both of the first and second recording and reproducing paths 1 and 2 for recording and reproducing the audio signal. Input terminal 27.29
are contacted via switches 29 and 30, and the audio signal is mixed between the first and second recording and reproducing systems, and the audio signal passing through one recording and reproducing system is mixed with the other recording and reproducing system. A photoelectric element 31 optically coupled to a light emitting element 33 which is controlled to be turned on or off by a control circuit 32 having editing switches 34 and 35 and a time constant circuit 39 for control of switching to an audio signal is connected, and an audio signal is edited. At this time, the switches 29 and 30 are controlled to open and close according to the selection operation of the editing switch, while the time constant circuit delays the lighting and extinguishing control of the light emitting element, and the first and second recording/reproducing systems An audio signal editing device characterized by fading control of contact and separation of