JPH0416285Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is an acoustic device (commonly known as Karaoke equipment).

Conventional configuration and problems thereof In recent years, karaoke machines have become popular in general households and are being used by a wide range of people. In addition, there are many magnetic tapes on the market (commonly known as audio multiplex karaoke tapes, hereinafter referred to as audio multiplex tapes) on which the singing voice of a professional singer is recorded separately on the right channel, and the accompaniment of the song is recorded separately on the left channel. It is widely used for singing practice and other purposes.

The mixing recording of the conventional karaoke apparatus will be explained below.

FIG. 1 shows a block diagram of a conventional karaoke apparatus for mixing and recording. The audio signal input from the microphone 5, the right channel music signal input from the right channel input signal terminal 6, and the left channel music signal input from the left channel input signal terminal 7 are mixed by resistors 8, 9, and 10. The signal is amplified by an amplifier 4 and supplied to a recording head 12. Right channel input signal terminal 6
When a music signal is input to the left channel input signal terminal 7 and the voice sung along with the music signal is input to the microphone, the music signal and the singer's voice signal are mixed and recorded. This is the basic configuration of the recording method.

However, with the above configuration, when the input signal is a so-called audio multiplex tape, the professional singer's singing voice, the singer's singing voice input from the microphone, and the accompaniment of the song are recorded at the same time, giving an extremely unnatural impression. give. There is also a so-called audio multiplex tape in which a male vocalist and a female vocalist sing alternately on the right channel and are recorded as a duet (hereinafter referred to as a duet audio multiplex tape). In such cases, for example, If you record the singing voice of a professional singer, in which only the male vocal part is input from the microphone, and the female vocal part is recorded as-is, it will sound as if it were the singer input from the microphone. It is impossible to realize the function of sounding like a duet by a professional female vocalist.

Purpose of the invention This invention solves the above-mentioned conventional problems.
By blocking the right channel input signal only when there is an audio signal input from the microphone, for example, the playback signal of a duet audio multiplex tape is used as the input signal, and in the male vocal part, the voice of a male singer input from the microphone is input. The signal and accompaniment are mixed and output, and the female vocal part is mixed and output with the reproduced singing voice of a professional singer and the accompaniment, so that it can be heard as if a professional female singer is performing a duet with the male singer input from the microphone. The purpose is to

Structure of the invention The present invention comprises a first amplifier that amplifies the audio signal obtained from the microphone, second and third amplifiers that amplify the left and right two-channel signals separately, and the first, second, and a fourth amplifier that mixes the output signal of the third amplifier to drive the recording head; a rectifier circuit that converts the output signal of the first amplifier into a DC voltage; This is a magnetic recording/playback device equipped with a muting circuit that cuts off the output signal, and cuts off the right channel input signal only when there is an audio signal input from the microphone. For the male vocal part, the male singer's voice signal input from the microphone is mixed and played back with the accompaniment, and for the female vocal part, the function is to mix the reproduced singing voice of a professional singer and the accompaniment. This is a magnetic recording and playback device that is highly effective for practicing.

DESCRIPTION OF THE EMBODIMENT FIG. 2 shows a block diagram of an embodiment of the present invention. In FIG. 2, the output of the microphone 5 is connected to the amplifier 1 and the right channel input terminal 6.
The left channel input terminal 7 is connected to amplifiers 2 and 3, respectively, and the outputs of the amplifiers 1, 2, and 3 are mixed by resistors 8, 9, and 10, and are connected to an amplifier 4. The output of amplifier 4 is connected to recording head 12. On the other hand, the output of the amplifier 1 is connected to a rectifier circuit 14, and the output of the rectifier circuit 14 is connected to the base of a transistor 13 via a switch 15 and a resistor 11. The collector of the transistor 13 is
At the output of the amplifier 2, the emitters are respectively connected to ground.

The operation of the magnetic recording and reproducing apparatus of this embodiment configured as described above will be explained below.

First, when the switch 15 is off, the transistor 13 has no effect on the circuit, so its operation is the same as in the conventional example.

Next, a case where the switch 15 is on will be explained. When no audio signal is input from the microphone 5, the output of the amplifier 1 is zero and the detection circuit 14
The output of is also zero. Therefore, transistor 13
The right channel music signal and the left channel music signal are respectively amplified by amplifiers 2 and 3, mixed by resistors 9 and 10, further amplified by amplifier 4, and supplied to recording head 12. When an audio signal is input from the microphone 5, it is amplified by the amplifier 1, converted to direct current by the detection circuit 14, and the base current of the transistor 13 flows through the switch 15 and the resistor 11, and the transistor 13 is turned on. Therefore, the right channel music signal is cut off, and only the audio signal input from the microphone 5 and the left channel music signal are mixed by the resistors 8 and 10, further amplified by the amplifier 4, and supplied to the recording head 12.

As described above, according to this embodiment, the switch 15
When turned off, normal karaoke mixing recording is performed. When the switch 15 is turned on, the right channel input signal is cut off only when there is an audio signal input from the microphone 5. For example, if the playback signal of a duet audio multiplex tape is used as the left and right channel input signal, the male vocal part is input from the microphone. It can record only the input singer's audio signal and accompaniment, and the female vocal part can be recorded as the reproduced singing voice of a professional singer. Therefore, when a magnetic tape recorded in this manner is played back, it is possible to realize the characteristic that it sounds as if the singer input through the microphone and a professional female vocalist were performing a duet. In the above embodiment, recording was performed using the magnetic head 12, but if a speaker is used, the features of the present invention can be realized as reproduced sound for the same reason.

Effects of the invention According to the invention, when there is a microphone input,
Since it is possible to mute the playback signal of the first channel and mix the microphone input with the playback signal (for example, accompaniment sound) of the second channel, the vocal signals of male and female singers are alternately recorded on the first channel. Using the media that
Only when the singing voice is input from the microphone, the singing voice from the microphone can be output instead of the singer's vocal signal, and a magnetic recording and reproducing device with great singing and practice effects can be realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional mixing and recording circuit, and FIG. 2 is a block diagram of an embodiment of the present invention. 1, 2, 3, 4...Amplifier, 5...Microphone, 6...Right channel input signal terminal, 7...Left channel input signal terminal, 8, 9, 10, 11...
...resistor, 12...recording head, 13...transistor, 14...rectifier circuit, 15...switch.

Claims (1)

[Scope of utility model registration request] a first amplifier that amplifies the audio signal obtained from the microphone; second and third amplifiers that amplify left and right separated two-channel signals separately;
a fourth amplifier that mixes the first, second, and third amplifier output signals to drive the recording head;
a rectifier circuit that converts the first amplified output signal into a DC voltage; and a rectifier circuit that converts the first amplified output signal into a DC voltage;
1. A magnetic recording and reproducing device comprising: a muting circuit for blocking an amplifier output signal.