JPH026551Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a tape recorder, and in particular to a first magnetic head for reproducing signals recorded on a first track and a second track provided on a magnetic tape. and a tape recorder comprising a second magnetic head. (B) Prior Art Recently, an audio device called a karaoke machine has become popular, which mixes a playback signal of an instrumental music signal recorded on a magnetic tape with a singing voice obtained from a microphone and emits the sound from a speaker. Generally, the magnetic tapes used in such karaoke machines recorded only instrumental signals, but recently there have been two tracks, with instrumental signals recorded on one track and singing voices recorded on the other. Magnetic tape called audio multiplexing is becoming popular. If such audio multiplexed magnetic tape is played back with a stereo tape recorder, the music can be listened to in the same way as a normal music tape. By reproducing only the signals, the device can be operated as a karaoke device. On the other hand, when such an audio multiplexing magnetic tape is incorporated into a karaoke machine, the singing voice from the microphone and the instrumental music signal from the magnetic tape are mixed and emitted from the speakers, but at this time the sound is played back from the magnetic tape. Listening to your singing voice on headphone will make it easier to sing. However, some audio multiplexed magnetic tapes have instrumental music signals recorded on the first track and singing voices on the second track, and conversely, singing voices are recorded on the first track and instrumental music signals are recorded on the second track. Conventional karaoke machines have been equipped with two headphone jacks to use two types of tapes, and have been configured to use a changeover switch to switch the signal path. (c) Purpose of the invention The present invention aims to provide a playback circuit for a tape recorder that can use two types of audio multiplexed magnetic tapes with different recording configurations without the need for two headphone jacks or changeover switches. That is. (D) Structure of the invention The invention provides a first mixing circuit for mixing the signals reproduced by the first magnetic head and the second magnetic head and inputting the mixed signal to the main amplifier circuit, and a second mixing circuit for mixing the signals and inputting the signals to the headphone amplifier circuit. A mixing circuit is provided, and a mixing amount variable means for varying the mixing amount of the first mixing circuit and the second mixing circuit is configured to vary the mixing amount in conjunction with each other, and the mixing amount of the reproduction signal from the first magnetic head and the second magnetic head is varied. When one of the reproduction signals is input to the main amplifier circuit, the other reproduction signal is input to the headphone amplifier circuit. (E) Embodiment The illustrated circuit is an embodiment of the reproduction circuit of the present invention. In the figure, 1 is a first magnetic head for reproducing a signal recorded on a first track provided on a magnetic tape; 2 is the first magnetic head 1;
3 is a second magnetic head for reproducing the signal recorded on the second track provided on the magnetic tape; 4 is a second magnetic head for reproducing the signal recorded on the second track provided on the magnetic tape; This is a second reproduction amplifier circuit to which the signal reproduced by the second magnetic head 3 is input and which amplifies the signal.
A first mixing circuit 5 mixes the reproduction signal from the first reproduction amplifier circuit 2 and the reproduction signal from the second reproduction amplifier circuit 4, and is connected to the output signal path of the first reproduction amplifier circuit 2. Insert connected resistor 6,
7. It is composed of resistors 8 and 9 inserted and connected to the output signal path of the second reproduction amplifier circuit 4, and a first variable resistor 10 for varying the mixing amount. 11 is a microphone; 12 is an amplifier circuit for the microphone that receives a signal obtained from the microphone 11 and amplifies the signal; and 13 is a mixed signal from the first mixing circuit 5 and an amplifier circuit for the microphone. A main amplifier circuit receives the microphone signal from 12 and amplifies the signal. Reference numeral 14 is a speaker to which the signal amplified by the main amplifier circuit 13 is applied and emits the signal. A second mixing circuit 15 mixes the reproduction signal from the first reproduction amplifier circuit 2 and the reproduction signal from the second reproduction amplifier circuit 4, and is connected to the output signal path of the first reproduction amplifier circuit 2. Resistors 16 and 17 are inserted and connected, and resistors 18 and 19 are inserted and connected to the output signal path of the second reproduction amplifier circuit 4.
and a second variable resistor 20 that varies the mixing amount. 21 is the second mixing circuit 1
22 is a headphone jack into which a headphone plug is inserted, and a signal to which the output signal of the headphone amplifier circuit 21 is applied; A terminal 23 and a ground terminal 24 are provided. In such a configuration, the slider 10a of the first variable resistor 10 constituting the first mixing circuit 5 and the slider 20a of the second variable resistor 20 constituting the second mixing circuit 15 are configured to interlock with each other. and the reproduction signal from the first reproduction amplifier circuit 2 and the second reproduction amplifier circuit 4.
The relationship is such that the amount of mixing with the reproduced signal from is reversed. The reproducing circuit of the present invention is constructed as described above, and its operation will be explained next. First, a case will be described in which a magnetic tape is used in which an instrumental music signal is recorded on the first track and a singing voice is recorded on the second track. When a reproduction operation is performed using such a magnetic tape, the first magnetic head 1 reproduces an instrumental music signal, and the second magnetic head 3 reproduces a singing voice. The instrumental music signal reproduced by the first magnetic head 1 is input to a first reproduction amplifier circuit 2 and amplified, and the singing signal reproduced by the second magnetic head 3 is input to a second reproduction amplifier circuit 4. amplified. The instrumental music signal amplified by the first reproduction amplifier circuit 2 is sent to a first mixing circuit 5 and a second
The singing voice signal applied to the mixing circuit 15 and amplified by the second reproduction amplifier circuit 4 is applied to the first mixing circuit 5 and the second mixing circuit 15 . The mixing amount of the instrumental music signal and the singing signal applied to the first mixing circuit 5 is adjusted by the first variable resistor 10 and input to the main amplifier circuit 13. In addition, the instrumental music signal and singing voice signal applied to the second mixing circuit 15 are transferred to the second variable resistor 20.
The mixing amount is adjusted by the controller and inputted to the headphone amplifier circuit 21. The main amplifier circuit 13
The mixed signal of the instrumental music signal and the singing signal inputted to the 14 is amplified and then applied to the speaker 14 to emit sound. Further, the mixed signal of the instrumental music signal and the singing voice signal inputted to the headphone amplifier circuit 21 is amplified and then sent to the signal terminal 2 of the headphone jack 22.
3 is applied. Therefore, if a headphone plug is inserted into the headphone jack 22, the mixed signal can be heard through the headphone.
When the slider 10a of the first variable resistor 10 is adjusted to an intermediate position, the slider 20 of the second variable resistor 20
a is an intermediate position, and in such a state, the mixing ratio of the instrumental music signal and the singing signal is the same. Therefore, the signal heard by the speaker 14 and the signal heard by the headphone are the same. In such a state, if the signal emitted from the speaker 14 is to be only an instrumental music signal, slide the slider 10a of the first variable resistor 10 constituting the first mixing circuit 5 to the (A) side. It is done by forcing. When the slider 10a is slid toward the (A) side, the dividing point P between the resistors 8 and 9 is grounded by the slider 10a. As a result, the singing voice, which is the output signal of the second reproduction amplifier circuit 4, is transmitted to the main amplifier circuit 13.
Instead, the main amplifier circuit 13 receives the instrumental music signal which is the output signal of the first reproduction amplifier circuit 2, and only the instrumental music signal is emitted from the speaker 14. Further, when the slider 10a of the first variable resistor 10 is slidably displaced to the (A) side, the second mixing circuit 1
Slider 20a of the second variable resistor 20 constituting No. 5
is slid to the (a) side. The slider 20a
is slid to the (a) side, the dividing point Q of resistors 16 and 17
is grounded by the slider 20a. As a result, the instrumental music signal which is the output signal of the first reproduction amplifier circuit 2 is not input to the head-on amplifier circuit 21, and the output signal of the second reproduction amplifier circuit 4 is not input to the head-on amplifier circuit 21. A certain singing voice signal will be input, and the only signal heard by the headphone will be the singing voice signal. Therefore, when a user sings along with the instrumental music signal emitted from the speaker 14, the singing voice emitted by the user is converted into an electrical signal by the microphone 11 and sent to the microphone amplifier circuit 12 as a microphone signal. The microphone signal input to the microphone amplification circuit 12 is amplified and then input to the main amplification circuit 13 where it is output to the speaker 14 along with the instrumental music signal which is the output signal of the first reproduction amplification circuit 2. More sound is emitted. In this way, the user's singing voice is emitted from the speaker 14 along with the instrumental music signal that serves as accompaniment.
In such a situation, if you sing while listening to the singing voice from the magnetic tape using a headphone, you can easily sing the lyrics without making mistakes. As described above, when the slider 10a of the first variable resistor 10 constituting the first mixing circuit 5 is slid to the (A) side , the second
The slider 20a of the variable resistor 20 is slid to the side (a). In this state, the signal reproduced by the first magnetic head 1 is emitted from the speaker 14, and the signal reproduced by the second magnetic head 3 is emitted. The reproduced signal is emitted by a headphone connected to the headphone jack 22 . On the contrary, when the slider 10a of the first variable resistor 10 is slid to the (B) side, the slider 20a of the second variable resistor 20 is interlocked with the slider 10a (b).
In this state, the signal reproduced by the second magnetic head 3 is emitted from the speaker 14, and the signal reproduced by the first magnetic head 1 is emitted from the headphone jack 22 . The sound is emitted by the headphone connected to the headphone. When the slider 10a of the first variable resistor 10 constituting the first mixing circuit 5 is slidably displaced from (A) to (B), the second variable resistor 20 constituting the second mixing circuit 15 The slider 20a of (a)
The signal emitted from the speaker 14 as a result of this displacement and the signal emitted from the headphone through the headphone jack 22 are the reproduced signals from the first magnetic head 1. The mixing amount of the reproduction signal from the second magnetic head 3 and the reproduction signal from the second magnetic head 3 have an opposite relationship. Therefore, when using a magnetic tape on which an instrumental music signal is recorded on the first track and a singing voice is recorded on the second track, the slider 10a of the first variable resistor 10 is adjusted to (A) as described above. By sliding it to the side, only the instrumental music signal can be emitted from the speaker 14. Also the first
When using a magnetic tape in which a singing voice is recorded on one track and an instrumental music signal is recorded on a second track, sliding the slider 10a of the first variable resistor 10 to the (B) side will produce an instrumental music signal. Only the sound can be emitted from the speaker 14. (f) Effects of the invention The invention provides a first mixing circuit for mixing the signals reproduced by the first magnetic head and the second magnetic head and inputting the mixed signal to the main amplifier circuit, and a first mixing circuit for mixing the signals and inputting the signals to the headphone amplifier circuit. Two mixing circuits are provided, and a first mixing circuit and a second mixing circuit are provided.
Mixing variable means that respectively vary the mixing amount of the mixing circuit are made to vary in conjunction with each other, and one of the reproduced signals from the first magnetic head and the second magnetic head is inputted to the main amplifier circuit. At the same time, the other playback signal is input to the head-on amplifier circuit, so it is possible to use two types of audio multiplexing magnetic tapes, in which the recording tracks of the instrumental music signal and the singing signal are in an inverse relationship, by a simple operation. The present invention is most suitable as a playback circuit for a karaoke machine.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the reproduction circuit of the present invention. Explanation of main drawing numbers, 1...first magnetic head, 2...
...first reproduction amplifier circuit, 3...second magnetic head,
4... Second reproduction amplifier circuit, 5 ... First mixing circuit, 10... First variable resistor, 10a, 20
a...Slider, 11...Microphone, 12...
...Microphone amplifier circuit, 13...Main amplifier circuit, 14...Speaker, 15 ...Second mixing circuit, 20...Second variable resistor, 21...Headphone amplifier circuit, 22 ...Headphone gear Tsuku.

Claims (1)

[Scope of utility model registration request] a first magnetic head and a second magnetic head for reproducing signals recorded on a first track and a second track provided on a magnetic tape; and signals reproduced by the first magnetic head and the second magnetic head; The main amplifier circuit receives the signal inputted from the microphone and is connected to the speaker as a load, and the signal reproduced by the first magnetic head and the second magnetic head is inputted, and the output signal is outputted from the headphone. a head-on amplifier circuit applied to the jack; a first mixing circuit for changing the amount of signals reproduced by the first magnetic head and the second magnetic head mixed into the main amplifier circuit; and the first magnetic head. and a second mixing circuit for changing the mixing amount of the signal reproduced by the second magnetic head to the head-on amplifier circuit, the mixing amount variable means of the first mixing circuit and the mixing amount variable means of the second mixing circuit. The means are configured to vary in conjunction with each other, and when one of the reproduction signals from the first magnetic head and the second magnetic head is input to the main amplifier circuit, the other reproduction signal is input to the head amplifier. A playback circuit for a tape recorder, characterized in that the input is input to an amplifier circuit for use with a tape recorder.