JPS5923280Y2 - tape recorder with radio - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape recorder with a radio that records a radio signal and mixes it with a signal from a built-in microphone.This will be explained in detail with reference to the drawings. It is as follows.

1 is a built-in microphone, 2 is a radio, and output signals of these two are supplied to amplifiers 3 and 4, respectively.

Further, 5 and 6 are buffer resistors for mixing the outputs of the respective amplifiers 3 and 4, and the connection midpoint of each of the resistors 5 and 6 is connected to the input terminal of the amplifier 7.

The output signal of this amplifier 7 is transmitted through a switch 8, a volume 9,
Sound is emitted from a built-in speaker 11 via a power amplifier 10.

Here, 8, 16 and 18 are radio output on/off switches, and when the radio is off, contact a;
When C is connected and the radio is on, contacts S and C are switched in conjunction so that they are connected.

Reference numerals 12 and 17 are recording/reproducing switches that are switched in conjunction with the recording operation of the tape recorder, and contact a is used only when recording the microphone, radio output, etc. with the tape recorder.
, C are connected, and when the tape recorder is in other modes or when playing the microphone or radio output, contacts 1 and C are connected.

13 and 19 are switches for turning on/off the mixing operation of the microphone and radio outputs.

This switch is in a mixing-ON state when contacts a and C are connected, and is in a mixing-off state when contacts a and C are connected.

14 and 15 are an earphone jack and a bed phone jack, respectively, and when the earphone plug and headphone plug are not inserted into each jack, terminals a and l) are short-circuited, and terminals c and d are open. .

Furthermore, when the plug is inserted, terminals a and l) are opened, and terminals c and d are short-circuited.

The fixed resistor 20 operates to step down the radio output with respect to the microphone output when the microphone and radio outputs are mixed by turning on the switch 19.

Therefore, in a circuit having such a configuration, when listening to the reproduced sound using the built-in microphone 1 before performing a mixing operation, the switches 8, 16, and 18 are connected so that the respective contacts a and C are connected. Operate (switch 8.
16.18 is linked).

Then, the output signal of the radio 2 is transmitted to the contact a of the switch 16,
C and the switch 18 through contacts a and c, and the output signal of the amplifier 3 is inputted to the amplifier 7.

The output signal is sent to the switch 8, the volume 9,
It is monitored by a speaker via an amplifier 10.

Further, the output signal of the amplifier 7 is transmitted to the equalizer amplifier 21.
The data is recorded on the magnetic tape by the recording/reproducing head 22 via the recording/reproducing head 22.

Furthermore, when reproducing the output signal of the radio 2,
The switches 8, 16 and 18 are operated in the opposite manner to the above to connect contacts A and C.

Then, the output signal of the microphone 1 is grounded through the contacts S, C of the switch 16 and the contacts S, C of the switch 17, and the output signal of the radio 2 is grounded from the contacts S, C of the switch 12 to the contacts S, C of the switch 8. C and is added to the volume 9, and is reproduced by the speaker 11 in the same manner as in the reproduction of the microphone output described above.

When recording the output signal of Radio 2 on a magnetic tape, switches 12 and 17 are switched to connect contacts a and C, respectively.
is connected, the output signal of microphone 1 is sent to switch 16.
from the contact A of the switch 18 to the contact A of the switch 19.

It passes through C and is grounded.

On the other hand, the output signal of the radio 2 is applied from the amplifier 7 to the recording/reproducing head 22 and recorded on the magnetic tape, and is also transmitted from the line 25 to the contacts A and C of the switch 13 → the contacts A and C of the switch 12 → the switch 8 The signal is applied to the volume 9 through contacts S and C, and monitoring by the speaker 11 becomes possible.

Here, if you want to record the output signal of Radio 2 and mix it with the microphone output such as a human voice, operate the switches 8, 16, and 18, and set the respective contacts
and switch 12.17 to the recording operation, while keeping contacts a and c connected, switch 13.19 for mixing operation is turned on, that is, contacts a and c are connected.

Then, the circuit becomes the state shown in the figure, and the output signal from the microphone 1 and the output signal from the radio 2 are supplied to the amplifier 7 via the resistors 5 and 6, and the mixed output signal is sent to the equalizer. The information is recorded on a magnetic tape by a recording/reproducing head 22 via an amplifier 21.

In this case, the output signal of the radio 2 is grounded via the resistor 20, and is mixed with the microphone output at a lower level than when only the radio output signal is recorded.

At this time, a mixed signal of the microphone output and the radio output is applied to the line 25, but the contact of the switch 13
Since C is open, no sound is emitted from the speaker 11 due to the mixed signal.

Therefore, howling between the built-in microphone 1 and the speaker 11 is prevented from occurring.

Here, when an earphone or headphone plug is inserted into either the jack terminal 14 or 15, the mixed signal from the amplifier 7 is transmitted from the line 26 to the earphone jack or headphone jack terminals c and d.
→ Line 27 → Contacts a and C of switch 13 → Contacts a and c of switch 12 → Contact of switch 8.

The signal passes through the path C→Volume 9→Amplifier 10→Line 28, and can be monitored using earphones or headphones.

Here, when the plug is inserted, the speaker 11
It is necessary to connect the switches 23 and 24, which are opened by the insertion operation of the plug, to the circuit so as to interrupt the circuit between the amplifier 10 and the amplifier 10.

In addition, the connection points of the switches 23 and 24 are not limited to only between the amplifier 10 and the speaker 11, but also between the amplifier 1 and the speaker 11.
It is also optional to connect the 0 output to ground.

As described above, according to the present invention, even when performing a mixing operation, it is possible to mix the output of the built-in microphone and the radio without causing howling, and it is also possible to reproduce only the radio output or only the microphone output. Even if you accidentally operate the mixing operation on/off switch during operation, the two outputs will not be mixed, and the output will not be mixed. It is possible to mix microphone outputs.

Furthermore, according to the configuration of the present invention, when recording radio output,
When mixing the microphone output, the radio output will be mixed with the microphone output at a level that has been lowered in advance by a constant resistor. For example, when receiving shortwave broadcasts from overseas broadcasting stations, make a note of the reception frequency etc. When recording instead, the level of the radio output is reduced simply by turning on the mixing operation switch, so there is no need to perform volume fade-in or fade-out operations during the mixing operation as in the prior art.

Therefore, when distant radio waves are momentarily or accidentally received, the radio output and built-in microphone output can be mixed at a predetermined ratio and quickly recorded on a magnetic tape.

[Brief explanation of the drawing]

The figure is a circuit diagram of a tape recorder with radio according to the present invention. 1...Microphone, 2...Radio, 8.1
6.18...Radio on/off switch, 12.17
...Recording/playback switch, 13.19...M
ixing on/off switch, 21...equalizer amplifier, 22...recording/playback head.

Claims (1)

[Scope of utility model registration request] A tape recorder with a built-in microphone and a radio,
A radio output selection switch, a mixing circuit that mixes the built-in microphone output and the radio output, and a mixing switch that selects the mixing operation are provided, and when the mixing switch is switched to the OFF position, the radio output that is in the ON position is a tape recorder connected to mute the built-in microphone output passing through the selection switch and muting the radio output passing through the attenuation resistor when switched to the on position, the radio output selection switch being in the off position; When recording, the radio output is connected so as to be muted by the radio output selection switch, and only the built-in microphone output is recorded, and when recording with the tape recorder with the radio output selection switch in the on position, A tape recorder with a radio configured to select between recording only the radio or recording a mixed output of the built-in microphone output and the attenuated radio output, depending on the switching position of the mixing switch.