JPS6138154Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a playback device, and a source program that is different from or the same as the source program being played back by the playback device.
By configuring the program to send
Easily connect various sources and devices in a location different from the playback device.
The purpose of the present invention is to provide a playback device that allows the use of programs.

Generally, playback devices such as stereo playback devices have a changeover switch that can switch input audio signals from various devices such as players, AM or FM receivers, and tape recorders, but it goes without saying that inputs that can be used simultaneously The number of audio signals (source programs) is limited to one. Therefore, if the source program is to be used in different locations at the same time, two or more of the above playback devices are required. However, when using different source programs at the same time in a relatively short distance, it is economically disadvantageous to use two or more of the above playback devices. Furthermore, with one playback device, while one source program is in use, it is impossible to simply monitor another source program.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a block system diagram of an embodiment of the reproducing apparatus according to the present invention. In the figure, 1, 2, and 3 are audio signal input terminals from different source programs, and the audio signals received from these are supplied to signal changeover switches 4 and 7 that switch independently from each other, where they are respectively switched. Only the audio signals are selectively passed through and output to the subsequent circuit. The audio signal selectively taken out from the signal changeover switch 4 is
The sound is amplified to an appropriate level by the sound amplifying section 5 and then supplied to the speaker 6, where it is sounded. The sound produced by the speaker 6 may be either stereo sound or monaural sound.

Although the above configuration is the same as that of the conventional playback device, the playback device according to the present invention receives the input audio signals from the various source programs mentioned above through the signal changeover switch 7.
Only one audio signal is selectively extracted and supplied to the transmitting section 8 and the audio amplifying section 9, respectively. The audio signal that has been converted into an amplitude modulated wave or a frequency modulated wave of a carrier wave suitable for transmission by the transmitter 8 is radiated from the transmitting antenna 10.

On the other hand, the audio signal supplied to the audio amplification section 9 and amplified to an appropriate level is transmitted to the speaker 1.
1, and this produces a sound. Therefore,
The listener listens to the main source sound produced by speaker 6.
While listening to the audio signal from the program through a headphone (not shown) instead of the speaker 6, a monitor device consisting of an audio amplification unit 9 and a monitor, for example, a speaker 11, transmits a signal different from the main source program to be sounded. You can monitor the audio signal of the source program you want.

Further, the amplitude modulated wave or the frequency modulated wave radiated from the transmitting antenna 10 as described above is
After being received by the receiving antenna 12 of the receiving device shown in the figure, it is demodulated by the receiving section 13, and further by the audio amplifying section 1.
4 and is supplied to the speaker 15, where the sound is generated. The receiving device shown in FIG. 2 may be a dedicated receiving device, but depending on the setting of the transmission carrier wave, a conventional cassette tape recorder with a radio equipped with a receiving function may also be used.

In this way, the device of the present invention can
Since the audio signal of the program can be transmitted, stereo playback or monaural playback can be easily performed using a receiving device as shown in Fig. 2 installed at a location different from the device of the present invention. The same source program or a different source program can be used at the same time on the receiving device installed at the different location. Since the above-mentioned receiving device only needs to have a receiving function, the overall cost is lower than in the past, which required a separate playback device.

FIG. 3 shows a specific circuit diagram of an example of a general playback device. In the figure, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. In FIG. 3, _5L is the left channel amplification section of the audio amplification section 5;
_5R is a right channel amplification section of the audio amplification section 5. Further, reference numeral 17 denotes a tone control circuit, which is provided within the audio amplifying section 5. The left channel amplifying section 5 _L constitutes a differential amplifier consisting of NPN transistors T _r11 and T _r12 that amplifies the audio signal input via the signal changeover switch 4.
Darlington-connected NPN transistors _{T r13 and} T _r14 and PNP transistors T _r15 and T _r16 are configured in a pure complementary push-pull configuration for power amplifying the signal taken out from the collector of the NPN transistor T r11. It consists of an amplifier and an NPN transistor T _r17 for applying a bias voltage to this push-pull amplifier. The right channel amplifying section 5 _R has the same configuration as the left channel amplifying section 5 _L , and is composed of NPN transistors T _r18 , T _r19 , T _r22 to T _r24 , PNP transistors T _r20 , T _r21 and the like.

With this configuration, the left channel signal is amplified and outputted from the output terminal 18 of the audio signal that has entered through the signal changeover switch 4, and the left channel signal is amplified and outputted from the output terminal 19.
The right channel signal is amplified and output.

FIG. 4 is a block system diagram of one embodiment of the main parts of the device according to the present invention, and the same parts as in FIG. 3 are given the same reference numerals. FIG. 4 is a specific circuit diagram of one embodiment of the transmitting section 8 shown in FIG. 1, in which a signal from the terminal 16 shown in FIG. 3 is applied to the base of the NPN transistor T _r25 . A varactor is connected to the collector of this transistor T _r25 through a resistor and a capacitor in series, and a coil L and a capacitor C ₁ to
A carrier wave of a predetermined frequency (for example, around 80 MHz) from a Clapp oscillation circuit composed of C ₄ , NPN transistor T _r26 , etc. is frequency-modulated by the audio signal from the terminal 16.

The modulated wave obtained by frequency modulation is supplied to the base of the NPN transistor T _r27 via the coupling capacitor _C5 . This transistor T _r27 is a buffer transistor for preventing the antenna terminal from affecting the carrier wave. The signal taken out from the collector of this transistor T _r27 is transmitted from the terminal 20 via a tuning circuit.

As described above, the playback device of the present invention includes a changeover switch that selectively switches and outputs one input signal from a plurality of input signals from a plurality of source programs, and a switch that reproduces the signal extracted from the changeover switch. Since it is equipped with a monitor device that generates sound and a transmitter that modulates and transmits the signal taken out from the second changeover switch, the receiver that receives the transmitted signal is installed in a separate location from the device of the present invention. By installing the same or different source programs at the same time, it is possible to enjoy the same or different source programs at the same time using a device with a relatively inexpensive configuration.In addition, a monitor consisting of an audio amplification section, a speaker, etc. is provided for monitoring the signal transmitted by the above-mentioned transmitting section. By installing a device, it is possible to monitor the signal being transmitted, and the device has features such as being able to monitor the signal of another program source through the speaker while listening to the signal of the main program source through the headphones. It is.

[Brief explanation of the drawing]

Fig. 1 is a block system diagram showing an embodiment of the device of the present invention, Fig. 2 is a block system diagram showing an example of a receiving device for receiving signals transmitted by the device of the present invention, and Fig. 3 is a block system diagram showing an embodiment of the device of the present invention. A concrete circuit diagram showing the reproducing system of the apparatus. FIG. 4 is a concrete circuit diagram showing an embodiment of the main part of the apparatus of the present invention. 1, 2, 3... Input terminal, 4, 7... Signal changeover switch, 8... Transmission section, 9... Audio amplification section, 1
1...Speaker, 20...Output terminal.

Claims (1)

[Scope of utility model registration request] It has a first changeover switch for selectively switching and outputting one input signal from a plurality of input signals from a plurality of source programs, and reproduces and sounds the signal taken out from the first changeover switch. In the apparatus, a second changeover switch that selectively switches and outputs one input signal from the plurality of input signals independently of the first changeover switch;
A playback device comprising: a monitor device that reproduces and sounds a signal taken out from the second changeover switch; and a transmitter that modulates and transmits the signal taken out from the second changeover switch.