JPS6336065B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder with a radio, in which two reproduction outputs, radio and tape, can be selectively combined and listened to using two headphones.

Recently, in the field of audio equipment, tape recorders with radios, generally referred to as radio cassette recorders, are rapidly becoming popular. And while these types of products are becoming larger due to the desire for luxury, there is also a demand for more compact and easy-to-use products, and in any case, multi-functionality is being sought in various aspects. There is a tendency.

Incidentally, although conventional tape recorders with radios handle two sources: radio and tape, only one of the sources can be listened to at a time.

Therefore, this invention has been made in view of the above points, and has a structure that allows the two playback outputs of radio and tape to be selectively combined and listened to at the same time using two headphones, thereby increasing the number of functions. The purpose of the present invention is to provide an extremely good tape recorder with a radio that can contribute to the present invention.

The tape recorder with a radio according to the present invention particularly includes a radio playback system and a tape playback system, first and second positions for selectively deriving one or the other of the output of the radio playback system and the output of the tape playback system, and the radio playback system. A third system that derives both the playback system output and the tape playback system output.
a function switch having a position of 1 and 2; the first and second positions of this function switch both output radio playback system output or tape playback system output, and the third position of the function switch outputs radio playback system output; Two headphone circuits, the other of which can be heard as the output of the tape playback system, a speaker circuit that is selectively used as at least one of these two headphone circuits, and a speaker circuit that outputs the output of the two microphone circuits in an operating state from the output of the radio playback system and/or a talk line switch circuit which is mixed into the output of the tape reproduction system, reduces the level of the output of the radio reproduction system and/or the output of the tape reproduction system when the headphone circuit is in use, and cuts off the speaker circuit when the speaker circuit is in use; It is characterized by having the following.

An embodiment of the present invention will be described in detail below with reference to FIG.

First, to explain the radio section, FM broadcast waves captured by the FM antenna 11 are sent to the AM/FM-IF common circuit 1 via the FM front end 12.
It is supplied to the FM input terminal of 3.

Also, the AM captured by the AM antenna circuit 10
Broadcast waves are directly transmitted to the AM/FM-IF shared circuit 1 above.
It is supplied to the AM input terminal of 3.

Here, the AM/FM-IF common circuit 13 is, for example,
It is designed to be integrated into an IC, and by opening a specific terminal (not shown) by a switch linked to the FM/AM changeover switches S ₁₀₁ and S ₁₀₂ , which will be described later, AM-MIX, AM-IF, and AM-DET can be set. It produces an AM detection output accompanied by a series of AM processing operations, and when grounded, FM-IF, FM-
It is designed to generate an FM detection output accompanied by a series of FM processing operations called DET. in this case,
AM local oscillation coil, AM-intermediate frequency transformer circuit, and FM- necessary for each AM and FM processing operation.
Ceramic filters and the like are attached externally (not shown).

Then, the FM detection output from the AM/FM-IF common circuit 13 is separated into left and right channel signals L and R of stereo broadcasting via the FM-MPX circuit MPX, and then sent to each of the FM/AM changeover switches S ₁₀₁ and S ₁₀₂ . FM
The AM detection output is directly and commonly supplied to the AM contacts of each of the switches S ₁₀₁ and S ₁₀₂ . Therefore, this is FM/
From each common contact of AM changeover switch S ₁₀₁ and S ₁₀₂
At the AM position, AM system output is derived and FM
FM system outputs will be derived at this position, and each of these radio system outputs will be supplied to the radio contacts [RADIO] of the function switches S ₂₀₁ and S ₂₀₂ , and will also be supplied to the first muting circuit 14, which will be described later. The signal is supplied to one input end of the change switch circuit 15 through selective muting and level control.

Here, in the first muting circuit 14, the muting transistors Q ₁ and Q ₂ are controlled in response to the function switches S ₂₀₁ and S ₂₀₂ , so that the first muting circuit 14 operates as the change switch circuit 15 in the radio position. The radio playback system output supplied to the switch circuit 15 is completely muted, and the radio playback system output is led to the change switch circuit 15 only in the tape [TAPE] and pair [PAIR] positions, and the talk (line)
In response to Switch S ₇₀₁ and S ₇₀₂ , the above pair [PAIR]
It has a function of narrowing down the derived amount in the ON state to a submultiple of the level in the OFF state.

Note that in order to completely mute the radio output by the first muting circuit 14 as described above, especially in the RADIO mode, only the radio output that has passed through the preamplifier 20 is used, as will be described later. It's for a reason. In other words,
If the radio system output that does not go through the preamplifier 20 is not completely muted, it will leak into the radio system output that goes through the preamplifier 20 at the change switch circuit 15, and the phase etc. of both will be affected. This is because, depending on the relationship, there is a risk that the original radio output may be adversely affected.

Next, to explain the tape part, 1 in the figure
6 and 17 are left and right channel magnetic heads for common use in recording and playback, and _S401 to _S406 are recording and playback selector switches, the PB contact of which is on the playback side and the REC contact on the recording side; here, the PB contact on the playback side is It shall be assumed that

That is, the left and right channel signals L and R from the magnetic heads 16 and 17 are sent to the function switch _S201 via the recording/playback switch _S401 or S402, the head amplifier 18 or 19, and the recording/playback switch _S405 or _{S406 .} or corresponding to S ₂₀₂ their respective tape contacts TAPE and pair contacts PAIR
are commonly supplied.

Here, the mode in which the paired contacts PAIR is selected means that the radio playback output and the tape playback output can be separately listened to in any combination using two headphones, which will be described later.

The tape system output or radio system output from each common contact of the function switches S ₂₀₁ and S ₂₀₂ is supplied to the left and right channel input terminals of the common preamplifier 20, where a predetermined signal is output for each channel. After being amplified to a high level, the signal is supplied to the other input end of the change switch circuit 15 via a second muting circuit 21 and a tone control circuit 22, which will be described later. Further, the output of the preamplifier 20 is supplied to a level meter circuit 23 and also to a cue circuit 24. However, the latter cueing circuit 24 works only in the tape mode and in the playback state, and in this case the level meter circuit 23 functions as a cueing display circuit.

Here, the second muting circuit 21 completely mutes the output from the preamplifier 20 on the recording side [REC] in response to the recording and playback switch S ₄₀₁ to S ₄₀₆ , and mutates the output from the preamplifier 20 on the playback side [P]. .
B], the same output is sent to the tone control circuit 22 only.
In addition, the talk switch described later
It has a function that responds to S ₇₀₁ and S ₇₀₂ and narrows down the derived amount of the reproduction side [PB] in its ON state to a level that is a divisor of that in its OFF state. It is something.

As a result, the change switch circuit 15 is connected to the preamplifier 20 in both the radio mode, tape mode (PB), and PAIR mode. Radio system output or tape system output will be supplied, but direct radio system output from the FM/AM selector switches S ₁₀₁ and S ₁₀₂ will be in tape [TAPE] mode and pair [PAIR] mode.
Only the mode will be provided.

Here, the change switch circuit 15 separates the radio system output or tape system output that has passed through the preamplifier 20 and is supplied in the radio [RADIO] mode or the tape [TAPE] mode into two systems and outputs them. The radio system output and the tape system output supplied in the PAIR mode are interlocked with a change switch _S801 , which will be described later, so that the two system outputs are interchanged and output.

Then, the first
The output of the system is supplied to the left and right channel input terminals of the first main amplifier 26 via the mode changeover switch circuit 25 and the volume adjusters VR _1L and VR _1R . Further, the second system output from the change switch circuit 15 is supplied to the left and right channel input ends of the second main amplifier 27 via the volume adjusters VR _2L and VR _2R .

In this case, the left and right channel output ends of the first main amplifier 26 are connected to the left and right channel speakers S _L and S _R via the first headphone jack J ₁ and talk switches S ₇₀₁ and S ₇₀₂ . That is, when the first headphone HP ₁ is connected to the first headphone jack J ₁ , the output from the first main amplifier 26 is supplied preferentially to the first headphone HP ₁ , and the output from the first main amplifier 26 is preferentially supplied to the first headphone HP 1. The same output is sent to speaker SP _L only when headphone HP ₁ is not connected.
This is the configuration supplied to the SP _R. In addition, the speaker
The output for SP _L and S _R is the talk switch S ₇₀₁ ,
S ₇₀₂ allows it to be supplied only in its OFF state and not in its ON state.

Further, a second headphone HP ₂ can be connected to the left and right channel output ends of the second main amplifier 27 via a second headphone jack J ₂ .

That is, the first and second headphone jacks
J ₁ , J ₂ have first and second headphones HP ₁ , HP ₂
is connected, the first and second headphones HP ₁ and HP ₂ will allow two listeners to receive radio output in RADIO mode, and tape output in TAPE mode. In PAIR mode, it is possible to listen to the radio output on one side and the tape output on the other (however, this can be selectively interchanged using the change switch S ₅₀₁ mentioned above). It is what it is.

In this case, the volumes of both can be adjusted separately by the first and second volume adjusters VR _1L , VR _1R and VR _2L , VR _2R , but the first volume adjusters VR _1L , VR _1R serves both as a volume adjustment for the first headphone HP ₁ and a volume adjustment for the speakers SP _L and SP _R.

Further, the first main amplifier 26 system has a main/sub relationship with the second main amplifier 27 system, and the main system can select stereo, monaural, and wide states by the mode selection switch circuit 25 described above. It has a configuration that can be used for various purposes.

Next, as described above, two listeners can receive radio output or tape output using the first and second headphones HP ₁ and HP ₂ in RADIO mode, TAPE mode, and PAIR mode. ]
We will explain the talk function that is required when listening to music in either mode at the same time.

In other words, this talk function is necessary when two listeners have a conversation while continuing to listen, and in such cases, the talk switches S ₇₀₁ and S ₇₀₂ mentioned above are turned on [ON]. By setting this to the state, the talk function is enabled.

In other words, when the talk switches S ₇₀₁ and S ₇₀₂ are turned on, the second muting circuit 21 or the first and second muting circuits 14 and 21 are activated in conjunction with this as described above.
As a result, the radio system output or tape system output supplied to each input side of the change switch circuit 15 is reduced by half from the normal level.

On the other hand, turn on talk switches S ₇₀₁ and S ₇₀₂ .
Since the driving voltage is applied to the talk amplifiers 28 and 29 of the left and right channels via the diodes D ₁ and D ₂ in conjunction with the state, the internal microphones I _L and I _R or the external microphone
The conversation output of each listener from EM _L and EM _R is derived from talk amplifiers 28 and 29, and is connected to the first and second listeners via resistors R ₁ and R ₂ or R ₃ and R ₄ respectively.
are supplied to the input terminals of the corresponding channels of main amplifiers 26 and 27.

In other words, as a result of this, the radio system output or tape system output whose level has been halved and the conversation output between listeners are mixed and output to the first and second headphone HP ₁ and HP ₂ , so that two people This allows multiple listeners to perform a talk function, such as having a conversation (including ambient sounds), while listening to the same or different sources through separate headphones, without having to take off the headphones.

In this case, if the external microphones EML _{and EMR} are connected to the external microphone jacks J ₃ and J ₄ , the mode will be external, and if the same microphones are not connected, the mode will be internal microphone mode with the internal microphones _IML and _IMR . .

Also, the talk function is used not only when two listeners need to have a conversation using the separate headphone described above, but also when one listener uses the first headphone HP ₁ .
Or, if you need to hear surrounding sounds while listening to radio output or tape playback output from speakers SP _L and S _R , use the talk switch S ₇₀₁ .
By turning S ₇₀₂ into the ON state, substantially the same effect as described above can be achieved. However, when listening through the speakers S _L and S _R , the reproduced sound will be completely blocked.

Next, to explain the case where the recording/playback selector switches S ₄₀₁ to _{S 406} are on the recording side [REC], in this case, the output from the internal microphones I _L , I _R or the external microphones E _L , E _R or the radio system output is The signal is output as a recording signal for the left and right channels to the common terminals of the switches S ₄₀₃ and S ₄₀₄ via the preamplifier 20, which serves as a recording amplifier. and,
In this case, the bias signal from the bias oscillator OSC, which is activated in conjunction with the recording side [REC] of the recording changeover switches _S401 to _S406 , is applied to the same switches _S403 ,
By being supplied to each recording side [REC] contact of S ₄₀₄ , the above-mentioned recording signal is superimposed on the bias signal at that part, and the magnetic head 1 of the left and right channels is
6, 17 and is recorded on tape.

Next, we will explain some interesting recording formats that can be made using the aforementioned PAIR mode.

In other words, this is a function switch.
This can be applied when recording is mainly performed using the internal microphones IML _{and IMR ,} with S ₂₀₁ and S ₂₀₂ as the pair [PAIR] contacts, and the recording/playback switch S ₄₀₁ to _{S 406} as the recording side [REC] contacts. be.

Then, the user operates the change switch _S501 so that the radio system is in the receiving state of the desired station of the desired band, and the reproduced sound is output from the speakers SPL _{and SPR} . In this case, the output from the preamplifier 20 to the change switch circuit 15 is completely cut off by the second muting circuit 21.

In other words, in this way, the radio playback sound output from speakers SP _L and S _R is also output from the internal microphone.
This will be recorded along with the content recorded by _IML and _IMR . Here, if the radio playback sound is a so-called karaoke performance and the recorded content is the listener's own voice, then the karaoke performance and the voice can be recorded simultaneously, so to speak, a karaoke recording can be made. It goes without saying that the recorded content may be a conversation between two listeners.

Next, to explain the reproduction mixing function, by connecting an external mixing microphone _Mn to the mixing microphone jack _J5 , the mixing amplifier 30 and the resistor _R5 ,
The output from the mixing microphone M _n is mixed to the left and right channel input terminals of the first and second main amplifiers 26 and 27 via R ₆ or R ₇ and R ₈ , and is then sent to the radio system output or tape system output. It is possible to mix and reproduce desired source sounds to be mixed. In this case, the output from the mixing microphone M _n can be adjusted to a desired level by the volume adjuster VR _n .

The features of the tape recorder with radio according to the embodiments described above are as follows.

First, in pair mode, radio output and tape output can be listened to in any combination using two headphones at the same time.

The second point is that in either playback mode, it is possible to have a conversation through the microphone using the talk line, but in this case, the talk switch completely blocks out the sound played from the speaker and lowers the level of the playback sound when using the headphone. The main point is that it does not interfere with this.

The third point is that the sound reproduced from the two headphones can be switched between the radio system output and the tape system output.

The fourth point is that in pair mode, while listening to the radio system output through the speakers, it is possible to record the conversation between two people and the radio playback sound from the speakers using a microphone.

The fifth point is that the volume of the two headphones can be adjusted separately, and in this case, the main system is organically constructed so that it also serves as the volume adjustment for the speaker.

FIG. 2 shows a stereo radio cassette recorder as an implementation example of the tape recorder with radio according to the above embodiment. That is, 31 is a tape recorder section, 32 and 33 are left and right channel speakers, 34 is a radio dial display section, 35 is a level meter and cue display section, 36 and 37 are internal microphone pickup sections for left and right channels, and 38 is a mixing section. Microphone volume adjustment knob, 39 is the second headphone volume adjustment knob, 40 is the sound quality adjustment knob, 4
1 is a first headphone and speaker volume adjustment knob, 42 is a change switch, 43 is a talk switch, 44 is a mixing microphone jack, 4
5 and 46 are first and second headphone jacks, 47 is a tape selection switch, 48 is a function switch, 49 is a band selection switch, 5
0 and 51 are cue set and reset switches, and 52 is an editor switch.

It goes without saying that the present invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

Therefore, as detailed above, according to the present invention, there are provided a radio playback system, a tape playback system, and first and second systems for selectively deriving one or the other of the radio playback system output and the tape playback system output. a function switch having a third position that outputs both the radio playback system output and the tape playback system output; Two headphone circuits, one of which can be heard as an output or a tape playback system output, and one of which can be heard as a radio playback system output and the other as a tape playback system output in the third position, and at least one of these two headphone circuits can be used selectively. A speaker circuit and two microphone circuit outputs are mixed into the radio playback system output and/or the tape playback system output in an operating state, and when the headphone circuit is used, the level of the radio playback system output and/or tape playback system output is reduced. The device is also characterized by comprising a talk line switch circuit that cuts off the speaker circuit when the speaker circuit is in use, thereby selectively combining the two playback outputs of the radio and the tape with the two headphones. By having a configuration that allows simultaneous listening, it becomes possible to provide an extremely good tape recorder with radio that can contribute to multiple functions.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of a tape recorder with a radio according to the present invention, and FIG. 2 is an external perspective view of a stereo radio cassette recorder showing an implementation example of FIG. 1. ...Radio Department, ...Tape Department, S ₁₀₁ , S ₁₀₂
...FM/AM changeover switch, S ₂₀₁ , S ₂₀₂ ...Function switch, 14...First muting circuit, 15...Change switch circuit,
S ₇₀₁ , S ₇₀₂ ... Talk (line) switch, S ₄₀₁ ,
S ₄₀₆ ...Recording/playback switch, 20...Preamplifier, 21...Second mutating circuit, 26,
27...First and second main amplifiers, _J1 , _J2 ...
First and second headphone jacks, HP ₁ ,
HP ₂ ...First and second headphone, SP _L ,
SP _R ...Speaker, VR _1L , VR _1R , VR _2L , VR _2R
...first and second volume adjusters, 28, 29...
...talk amplifier, IM _L , IM _R ...internal microphone, EM _L , EM _R ...external microphone, J ₃ , J ₄ ...
...external microphone jack, S ₅₀₁ ... change switch, 30 ... mixing amplifier, M _n ... mixing microphone.

Claims (1)

[Claims] 1. A radio playback system and a tape playback system, first and second positions for selectively deriving one or the other of the radio playback system output and tape playback system output, and both of the radio playback system output and tape playback system output. a function switch having a third position for both deriving the output signal, and the first and second positions of this function switch both serve as a radio playback system output or tape playback system output, and the third position outputs one of the functions. two headphone circuits that allow the output to be heard as a radio playback system output and the other as a tape playback system output, and at least one of these two headphone circuits is selectively switched to output the tape playback system output or the radio playback system output. A speaker circuit that enables listening, and when listening to the radio playback system output or tape playback system output by the two headphone circuits, or at least one of the two headphone circuits and the speaker circuit to play the radio playback system output or tape playback. It is selectively operated when listening to the system output, and for the headphone circuit, it attenuates the level of the radio playback system output or tape playback system output, and mixes it with the output from the two microphone circuits so that it can be heard. A tape recorder with a radio, further comprising a talk line switch circuit that shuts down the speaker circuit and shuts off any of the outputs to the speaker circuit, making it impossible to listen to the speaker circuit.