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JPS58171194

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DESCRIPTION JPS58171194
[0001]
The present invention relates to an audio device, in particular to a television receiver with one
loudspeaker and with an FM stereo radio part. In recent years, the miniaturization of television
receivers has progressed further, for example, a black and white television receiver using a 1.6
inch cathode ray tube and a color television receiver using a 3 inch color cathode ray tube have
appeared. When installing an FM stereo radio unit to such a small television receiver, only one
speaker can be arranged in the arrangement of the speakers because miniaturization is strongly
required, or two speakers are Even if the arrangement is made, the distance between the two can
not be sufficiently separated, and a stereo feeling can not be obtained. In any case, only one
speaker can be arranged. In the present invention, only one speaker is installed in the main body
of such a small television receiver, and on the other hand, stereo headphones are provided, and a
jack portion to which the stereo headphones can be connected is provided in the main body of
the receiver. When stereo headphones are not used, monaural reproduction is performed from
the speaker, and when stereo headphones are used, FM stereo broadcasting is reproduced in
stereo. One embodiment will be described below with reference to FIGS. 1 and 2. First, in FIG. 1,
1 is a television sound detection circuit, 2a and 2b are radio stereo demodulation circuits, and
respective demodulation output signals are left and right sound amplification circuits 7.8 by
sound signal switching diodes 3, 4 and 5.5. Divided into the input signal of ?????????
Reference numeral 11 is a junction capacitor, 12, 13 ░ 14 are resistors for applying a bias
current to the diodes 3, 4, and 5.6, and 15 and 16 are load resistors for the diode 3.4.5.
Reference numeral 17 denotes a radio-television selector switch, thereby selectively supplying a
power supply voltage to the television audio detection circuit 1 and the radio stereo
demodulation circuits 2a and 2b, and at the same time, turning on and off the diodes 3, 4, 5 and
6. Control. 18 is an audio amplification circuit, 19 is a speaker, 20 is a DC power supply,
21.22.23 is a load resistance, 24 is a stereo phone jack to the stereo, and the output terminals of
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the audio amplification circuits 7 'and 8 of the left side and the load resistance 21 , 22.23 and
the input end of the audio amplification circuit 18, and in the state where the plug of the stereo
headphone is not inserted and connected, the contact a-between the contacts c-d is closed during
the audio amplification The output end of the circuit 7 ░ 8 is connected to the input end of the
audio amplification circuit 18.
Reference numeral 25 denotes a forced monaural switch, which is closed to cause the
demodulation circuits 2a and 2b to be in monaural reproduction. In the above configuration,
when the radio-television changeover switch 17 is in contact with the radio side terminal R, a
radio stereo demodulation circuit 2. Power is supplied to a and 2b, and the switching diode 6.6 is
made conductive through the resistor 13.14. Due to this bias current, a potential difference
occurs between both ends of the load resistor 16.16, and the switching diode 3.degree. On the
television sound detection circuit 1 side is reverse biased and the television sound detection
circuit 1 is disconnected from the sound amplification circuits 7 and 8. It is released. That is, the
output audio signals of the radio stereo demodulation circuits 2a and 2b are input to the left and
right audio amplification circuits 7 and 8, respectively. Even when the forced monaural
reproduction state 25 of the radio stereo demodulation circuits 2a and 2b is closed and the
monaural reproduction state is performed, the outputs of the stereo demodulation circuits 2a and
2b are merely equalized, and the same operation as described above is performed. On the other
hand, when the radio-television changeover switch 17 is connected to the television-side terminal
T, conversely the switching diodes 3 and 4 become conductive, the switching diodes 5 and 6 are
cut off, and the audio output signal of the television sound detection circuit 1 Are input to the
audio amplification circuits 7 and 8. Thus, the audio signals supplied to the left and right audio
amplification circuits 7 and 8 are amplified and output to the stereo headphone jack 24. When
the plug 27 of the stereo headphone 26 shown in FIG. 2 is connected to the stereo headphone
jack 24, the contact ab of the jack 24 and the cd are opened, and the plug 27 is connected to the
contacts a and d. Therefore, the audio amplification circuits 7 and 8 and the audio amplification
circuit 18 are disconnected, and when the outputs of the audio amplification circuits 7 and 8 are
a television audio signal and a small geo monaural signal, they are reproduced in monaural. If it
is played in stereo. When the plug 27 of the stereo headphone 26 is connected to the jack 24, the
audio output signals of the left and right audio amplification circuits 7, 8 are combined by the
load resistance 21 ░ 22. It is input to the second voice amplification circuit 18. The audio signal
amplified by the audio amplification circuit 18 is applied to the speaker 19 and reproduced in
monaural as an acoustic signal. In FIG. 2, 28 is a cathode ray tube, 29 is a tuning knob, 30 is a
volume control knob, and 31 is an indicator. As described above, according to the present
invention, it is possible to impair stereo function, which is a major feature of the ultra-lJS type
television receiver, and to perform stereo reproduction with a speaker using stereo headphones if
necessary.
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In addition, there is no need to add a changeover switch or special headphone jack to switch
between stereo headphone playback and built-in speaker playback, and the number and
arrangement of various operation parts on product installation is high, and miniaturization is
achieved. It also has the advantage of being less constrained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a circuit diagram of an acoustic device according to an embodiment of the present
invention, and FIG. 2 is an external perspective view of the device.
1 и и и и и и и и TV audio detection circuit, 2a, 2b и и и и и и и и и и radio unit stereo demodulation circuit, 3,
4, 5.6 и и и и и и и и и и и и и switching diode, 7, 8 ииииииии Audio amplification circuit, 17 иииииииии Radiotelevision selector switch, 19 иииииииии Speaker, 20 ииии DC power supply, 24 ииииииииииииии Stereo headphone
Jack, 26 ..... Stereo headphones. Name of agent Attorney Nakao Toshio Other 1 person Figure 1
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