KR910005800Y1 - Voice receiving circuit - Google Patents

Abstract

No content.

Description

Wireless Voice Receiver

1 is a block diagram of a television receiver to which the present invention is applied.

2 is a broadcast frequency waveform diagram.

3 is a block diagram of a wireless voice transmitter 12 used in FIG.

4 is a block diagram of a wireless voice receiver 100 capable of receiving a voice signal transmitted from a wireless voice transmitter 12 and controlling a television receiver remotely.

FIG. 5 is a detailed circuit diagram of the remote control transmission circuit 35 shown in FIG.

* Explanation of symbols for main parts of the drawings

SW1: Voice output selector switch SW2: Wireless voice receiver on / off switch

SW3: Automatic Switch SW4: Wireless Voice Transmitter Power Switch

IC: Integrated Circuit KM: Key Matrix

Q1, Q2: Transistor LED: Infrared Light Emitting Diode

The present invention relates to a wireless voice receiving apparatus using a remote controller. In particular, a separate wireless voice transmitter is incorporated in a voice output terminal of a television receiver, and a remote controller capable of remotely controlling a television can receive a voice signal transmitted from a wireless voice transmitter. The present invention relates to a wireless voice receiving device having a built-in wireless voice receiving unit which not only receives and outputs a voice signal of a television when the television receiver is operated, but also outputs a voice signal simultaneously from the television and the remote control.

As the industrial society is advanced, people seek more convenience, and accordingly, various home appliances are designed to be remotely controlled. For example, in the case of a television receiver, the volume function (VOL ▲: VOL ▼) power supply (PWR ON / OFF) and channel selection function (CH ▲: CH ▼), which can be performed on the television itself, can be remotely It can be controlled.

On the other hand, in such a television receiver having a remote control function, a person who wants to watch the television when another person who is not watching the television is sleeping or doing other work is put on the television receiver so as not to disturb the others. You had to connect earphones or headphones to the installed earphone jack to listen to the voice signal.

However, when the earphones or headphones are connected to clean the voice of the television receiver, the TV receiver is watched at a short distance, which causes eye fatigue. To prevent such visual impairment, the length of the earphones or headphones is long. Although commercially available, these earphones or headphones have a problem that is very inconvenient to use due to their long connection line.

Therefore, the present invention eliminates the earphones and headphones necessary to listen to the audio signal of the television receiver alone by connecting to the television receiver alone, and embeds a separate wireless voice transmitter in the audio output terminal of the television receiver and remotely controls the television. Possible remote control is equipped with a wireless voice receiver to provide a wireless voice receiver for outputting the audio signal of the television receiver from the remote control.

In order to transmit the audio signal output from the TV's output stage, there is a method of FM modulation using this audio signal. In this case, the distortion generated in the voice detection circuit and the voice amplifier circuit of the television and the distortion of the modulation circuit are added. The reception sound quality deteriorates and the circuit configuration becomes complicated. Therefore, the wireless voice transmitter used in the present invention comprises: a first filter circuit for filtering only voice intermediate frequency component signals of signals amplified by the voice intermediate frequency amplifier of a television of a television; and a first oscillator for generating a high frequency necessary for frequency conversion; It consists of a first mixer for mixing the voice intermediate frequency signal and a high frequency signal and an RF amplifier for amplifying the mixed signal, the wireless voice transmitter used in the present invention increases the frequency transmitted through the antenna to other devices It is also preferable to include a second filter, a second mixer and a second oscillator for removing interference.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 5.

Fig. 1 shows a circuit in which a wireless voice transmitter used in the present invention is provided in a conventional television receiver having a remote control function.

As shown here, when two carriers of video and audio are input through the antenna ANT1, the RF amplifier 1 amplifies the two signals with the same amplification degree and converts the frequencies to generate an intermediate frequency signal.

The generated intermediate frequency signal is amplified by the intermediate frequency amplifier 2, and then detected by the image detecting circuit 3 and the audio detecting circuit 4, respectively, to the image amplifier 5 and the audio intermediate frequency amplifier 6. Each is applied.

The image signal amplified by the image amplifier 5 is processed by color and latitude by the chroma processing circuit 7 to appear in the CRT 9 through the video output amplifier 8.

On the other hand, the voice signal amplified by the voice intermediate frequency amplifier 6 is modulated and demodulated by the frequency modulator and demodulator 10 via the voice output selection switch SW1, amplified by the voice amplifier 11, and then a speaker ( Output via SP). In addition, the voice signal output from the voice intermediate frequency amplifier 6 is input to the wireless voice transmitter 12 used in the present invention. The first dynamic light receiver 13 operates by a remote signal (e.g., an infrared signal) generated in the remote control transmission circuit (see FIG. 5) 35 to turn on the power to the television receiver or to select the audio output. The switch SW1 and the wireless voice transmitter power switch SW4 are controlled.

Here, reference numeral 15 is a power supply unit for supplying power to each circuit of the television receiver, SW4 is a power switch for supplying power to the wireless voice transmitter 120.

3 shows a detailed block diagram of the wireless voice transmitter 12 (see FIG. 1) used in the present invention. The signal amplified by the voice intermediate frequency amplifier 6 (see FIG. 1) passes only the voice intermediate frequency component signal by the filter circuit 16, and this signal is a first oscillator that generates a high frequency necessary for frequency conversion. The signal of (17) is mixed in the first mixer 18 and filtered again by the intermediate frequency filter 19, and then mixed again with the signal input from the second oscillator 21 by the second mixer 20. And is radiated to the outside through the transmitting antenna ANT2 via the RF amplifier 22. It is important to note that the higher the frequency, the smaller the size of the transmitting antenna ANT2 and the greater the attenuation of the signal outside the visible distance, so that the intermediate frequency filter 19, the second mixer 20 and the second oscillator 21 are larger. ) Is installed one more time.

4 is a block diagram of a remote controller having a wireless voice receiver 100 according to the present invention. As shown here, the high frequency signal transmitted from the wireless voice transmitter 12 (see FIG. 1) is amplified by the RF amplifier 23 through the receiving antenna ANT3 and then generated by the local oscillator 24. It is applied to the mixer 25 together with the high frequency signal. The signal output from the mixer 25 is amplified by the intermediate frequency amplifier 26 and then, by the filter 27 and the filter 28, the first audio signal 4.5MHZ and the second as shown in FIG. Filtered by voice signal (4.2742 MHZ). The signals respectively filtered by the filters 27 and 28 are respectively demodulated by the first voice demodulator 29 and the second voice demodulator 30 and then amplified by the voice amplifiers 31 and 32, and then The circuit 33 is separated into a left signal CHL and a right signal CHR, respectively, and is output to the outside through a speaker (not shown) installed in the remote controller.

On the other hand, the second voice demodulator 30 outputs a second voice signal and a recognition signal from the FM signal of 4.7242MHZ, which is a 50% amplitude modulation of 55.0699KHZ subcarrier to 149.9HZ in stereo broadcasting. In the case of multicasting, the 55.0699 KHZ subcarrier is 50% amplitude-modulated to 276Hz. That is, the recognition circuit 34 automatically switches the switch SW3 by discriminating whether it is stereo broadcasting or multicasting. In Fig. 4, reference numeral 35 denotes a remote control transmitter circuit within the remote control (this remote control transmitter circuit is different from the radio audio transmitter 12 shown in Fig. 1, i. 36 is a power supply unit for supplying power to the wireless voice receiver 100 and the remote control transmitter 35, and the former source is supplied from a battery used in a conventional remote controller. SW2 indicates a power switch for operating the wireless voice receiver 100 when ON.

5 is a detailed circuit diagram of the PCM remote control transmission circuit 35 (see FIG. 4) used in the present invention. The remote control transmission circuit 35 has various functions such as volume up / down (VOL ▲; VOL ▼) channels of a television. Normal remote control function to remotely control selection (CH ▲; CH ▼), power supply (PWR ON / OFF), and operate switch SW2 to listen to wireless voice signal from remote control itself, 13) a key matrix KM composed of a plurality of function keys K1 --- Kn for causing the control unit 14 to operate the switches SW1 and SW4, and the function keys Of the integrated circuit (IC), the capacitor (C1) (C2), the oscillator (X-Tal) and the light emitting diode (LED) and the light emitting diode (LED) for generating an infrared pulse during operation of the switch SW2. Is composed of transistors Q1 and Q2.

The operation of the present invention configured as described above will be described in detail.

For convenience of operation of a remote control having a built-in wireless voice receiver 100 according to the present invention, the remote control remotely controls all functions including a video signal and an audio signal of a television receiver is called a first mode. The second mode is to control the remote control and output only the audio signal through the remote controller, and the third mode is to simultaneously output the audio signal from the TV receiver and the remote controller.

First, in the case of the first mode, that is, when the remote controller remotely controls all functions including the video signal and the audio signal of the television, the user can select one of the plurality of function keys K1 --- Kn in the remote control transmission circuit 35. When the first power key PWR ON / OFF (not shown) capable of turning on / off the power is pressed, the power supply unit 15 provides the power supply + VDD to the integrated circuit IC.

Then, the user sets the function key (not shown) corresponding to the control switch (Remote / Local) that can remotely control the television to the remote and then the wireless voice receiver as shown in FIG. Press the function key (not shown) to cut off the power supplied to 100). When this function key is pressed, a low state signal is generated at the control terminal CONT of the integrated circuit IC to turn off the contact of the switch SW2.

When the control switch (Remote / Local) is located at the remote and the power key (PWR ON / OFF) is pressed, the power supply (+ VDD) turns on the transistor Q1, and the transistor Q1 is turned on the transistor ( Since Q2) is driven, current flows to the light emitting diodes (LEDs), and infrared pulses are generated therefrom. In this case, the emitted infrared pulses are vibration oscillator (X-Tal) capacitors C1 (C2) connected to the integrated circuit IC. The infrared rays emitted from the light emitting diodes (LEDs) are input to the light receiving portion 13 of the television shown in FIG. However, the coating pulse generated in the light emitting diode (LED) is a pulse fundamental frequency is determined by the intrinsic characteristic frequency of the oscillator (X-Tal). When an infrared pulse signal is input from the remote control transmission circuit 35 to the infrared light receiving unit 13 of the television receiver, the light receiving unit 13 applies this signal to the control unit 14, and the control unit 14 decodes it. Recognizing that the signal is power ON, the power supply unit 15 is first controlled to supply power to each circuit of FIG.

When the television is supplied with power, the user can select a function key (not shown) for turning on the audio output selection switch SW1 shown in FIG. 1 of the plurality of function keys in the key matrix KM (see FIG. 5). Press the function key for turning off the wireless voice and the transmitter power switch (SW4). When the key for operating the switches SW1 and SW4 is pressed, the integrated circuit IC shown in FIG. 5 converts it into a PCM code and passes through the light-receiving unit 13 as an infrared pulse through the light emitting diode LED. To the control unit 14. At this time, the control unit 14 decodes the pulse signal to turn on the voice output selection switch SW1 for muting the voice signal and to turn off the switch SE4.

After this state, the user can press the appropriate key (e.g., volume, channel selection key) to watch television. That is, the wireless composite signal (video + audio signal) passing through the antenna ANT1 is amplified by the RF amplifier 1 and then by the intermediate frequency amplifier 2.

Here, the video signal is detected by the video detection circuit 3 and subjected to the above-described processing, and the CRT 9 is displayed, and the audio signal is passed through the audio detection circuit 4 and the audio intermediate frequency amplifier 6. The switch SW1 is applied to the wireless voice transmitter 12, respectively.

In the state of the first mode, since the voice output selection switch SW1 is turned on, the voice signal is output to the outside through the speaker SP. However, since the wireless voice receiver ON / OFF switch SW2 and the wireless voice transmitter power switch SW4 are turned off in the first mode, power is not supplied to the wireless voice receiver 100 and the wireless voice transmitter 12. The audio signal is not output.

As described above, when the television receiver shown in FIG. 1 is to be controlled remotely using the remote control according to the present invention, the user operates the function key of the key matrix KM in the remote control transmission circuit 35 to control the radio output selection switch. It is sufficient to turn on SW1 (FIG. 1) and turn off the wireless voice receiver on / off switch SW2 (FIG. 4) and the wireless voice transmitter power switch SW4 (FIG. 1). Accordingly, it can be seen that in the operation of the first mode, the video and audio signals are simultaneously output only in the television, and the audio signals are not output in the remote controller itself.

Next, the case where only the video signal is output in the second mode, that is, the audio signal is not output, while the audio corresponding to the video of the television is output from the remote controller itself.

In case of the second mode, the user has a remote control transmitter 35 to turn on the wireless voice transmitter on / off switch SW2 for the power supplied to the wireless voice receiver 100 (FIG. 4) built into the remote controller. When the function key (key corresponding to switch SW2) is pressed in the key matrix KM, when this function key is pressed, the control terminal CONT of the integrated circuit IC generates a high signal Turn on the contact of the receiver ON / OFF switch SW2.

On the other hand, the user turns off the plurality of key dual voice output selection switches SW1 (see FIG. 1) in the key matrix KM, and activates the function keys for turning on the wireless voice transmitter power switch SW4.

When these function keys are operated, the integrated circuit IC shown in FIG. 5 converts them into PCM codes, generates infrared rays through the light emitting diodes (LEDs), and applies them to the control unit 14 via the light receiving unit 13. At this time, the controller 14 recognizes this to generate a low state control signal to turn off the voice output selection switch SW1, and generates a high state control signal to turn on the wireless voice transmitter power switch SW4. Therefore, when the television operates normally, the video signal appears in the CRT 9, but the audio signal is not transmitted to the speaker SP but is transmitted to the wireless voice transmitter 12, thereby preventing the operation of the wireless voice transmitter 12. It demonstrates with reference to FIG.

The audio intermediate frequency signal amplified by the audio intermediate frequency amplifier 6 of FIG. 1 is passed through the filter 16 to the first mixer 18 by passing only the audio intermediate frequency component signal. In the first mixer 18, the first oscillator 18 mixes the high frequency signal generated by the first oscillator 17 and the signal output from the filter 16 and applies it to the intermediate frequency filter circuit 19.

In the circuit shown in FIG. 3, the RF mixer 22 and the antenna ANT2 can be used in the first mixer 18 without the intermediate frequency filter 19, the second mixer 20, and the second oscillator 21. Although the output signal can be transmitted to the outside, in general, the higher the frequency, the smaller the antenna, the greater the attenuation outside the visible distance and less interference with other equipment, so that the second mixer 20 and the second emitter 21 are In addition to the higher frequency to pass through the RF amplifier 22 after passing the signal to the inner (ANT2) to radiate the radio waves in space. In this case, since the radio frequency band of the television is radiated as it is, the sound quality when received is almost intact in the sound quality of the original television.

The voice signal propagated to the outside through the antenna ANT2 is applied to the RF amplifier 23 through the antenna ANT3 of the wireless voice receiver 100 shown in FIG. In the second mode, since the wireless voice receiver on / off switch SW2 is ON, the wireless voice signal is amplified by the RF amplifier 23 and then applied to the mixer 25. The mixer 25 mixes the signal input from the RF amplifier 23 and the signal input from the local oscillator 24 and applies the mixed signal to the intermediate frequency amplifier 26 through its output stage. The amplified signal is mixed with the first audio signal (FM radio wave of 4.5 MHZ) and the second audio signal (FM of 4.7242 MHZ).

In this case, the FM signal of 4.5MHZ, which is the first voice signal, contains the L + R signal for stereo broadcasting and Korean for multicasting. In addition, the FM signal of 4.7242MHZ, which is the second voice signal, contains an L-R signal for stereo broadcasting and a foreign language for multicasting, and also includes an identification signal. However, the recognition signal is a 50% amplitude modulation (AM) of 55.0699KHZ subcarrier to 149.9HZ for stereo broadcasting, and 50% amplitude modulation of 55.0699KMZ subcarrier 276HZ for multicasting. In the case of mono broadcasting, the recognition signal becomes 0HZ.

In the circuit of FIG. 4, the filter 27 passes only the first audio signal L + R which is 4.5 MHZ among the broadcast signals shown in FIG. 2, and the filter 28 only the second audio signal LR which is 4.7242MHZ. As it passes, these (L + R, LR) are input to the first voice demodulator 29 and the second voice demodulator 30, respectively. At this time, the first voice demodulator 29 extracts the first voice signal (low frequency of 50 ~ 1500HZ) from the 4.5MHZ FM signal, and the second voice demodulator 30 receives the second voice signal and the recognition signal from the 4.7242MHZ FM signal. Is taken out and applied to the respective amplifiers (31) (32). The amplifiers 31 and 32 then amplify these audio signals 50-1500 HZ and apply them to the difference circuit 33.

The wagon circuit 33 separates the L and R signals by synthesizing (adding) the first audio signal L + R and the second audio signal LR in phase or adding (subtracting) in the reverse phase. It will output to the outside through speakers that are not The recognition circuit 34 determines whether the receiver is performing stereo broadcasting or voice multi-air broadcasting. The recognition signal is 50% AM of a 55.0699 KHZ subcarrier at 149.9HZ when the stereo broadcast is performed, and 55.0699 KHZ subcarrier is used when the broadcasting signal is multicast. 50% Amplitude Modulation to 276.0HZ Automatically Switches the Automatic Switching Switch (SW3) to Listen to Multiple or Stereo Voice Signals

In the second mode, that is, when the audio signal is not output from the television receiver, but instead the audio signal is output from the remote controller, the key matrix KM in the remote control transmission circuit (FIG. 5) is operated. The sound output selection switch SW1 is turned off and the switches SW2 and SW4 are turned on.

Finally, in the third mode, that is, when the audio signal is simultaneously output from the television receiver and the remote controller itself, the user operates the function key in the key matrix KM shown in FIG. 5 to output the voice output selection switch SW1. Turn on the wireless voice receiver on / off switch (SW2) and the wireless voice transmitter power switch (SW4). In this case, the signal output from the voice intermediate frequency amplifier 6 is output through the voice output selection switch SW1 and output to the speaker SP, and at the same time through the wireless voice transmitter 12, the wireless voice receiver in FIG. Is applied to 100. Therefore, since the wireless voice receiver ON / OFF switch SW2 is also on, the same voice signal as that of the speaker SP is output from the remote controller as the circuit of FIG. 4 operates. That is, when both the switches SW1, SW2, and SW4 are turned on, the audio signal is output simultaneously from the speaker of the television and the speaker of the remote controller.

As described above, the wireless voice receiver according to the present invention incorporates a simple wireless voice transmitter into a television receiver, and a conventional remote controller includes a wireless voice receiver for receiving a signal propagated by the wireless voice transmitter and outputting a voice signal. While the remote control is output from the television, only the audio signal is output from the remote control, and the function of simultaneously outputting the audio signal from the television and the remote control has three characteristics.

Although the present invention has been described with respect to a television for outputting a video signal and an audio signal, the present invention is not limited thereto but may be applied to an audio component capable of listening to radio broadcasts.

Claims (2)

An RF amplifier 1 for amplifying a television broadcast signal input through the antenna ANT1, and a voice signal for processing the audio signal among the signals amplified by the intermediate frequency amplifier 2 and outputting it to the outside through the speaker SP. A voice signal processing system including a circuit 4, an audio intermediate frequency amplifier 6, a frequency modulation and demodulator 10, and an audio amplifier 11, and a signal from a remote controller are received through the light receiver 13 at all times. A filter circuit installed inside a conventional remote control television set having a control unit 14 for supplying power to the circuit and generating a signal for controlling the RF amplifier 1, and filtering the output of the voice intermediate frequency amplifier 6. (16), the first oscillator 17 for generating a high frequency necessary for frequency conversion, the first mixer 18 for mixing the output signals of the filter circuit 16 and the oscillator 17, and the mixed signal An intermediate frequency filter 19 for filtering, The second mixer 20, the second oscillator 21, and the second mixer 20 for increasing the second frequency signal filtered by the intermediate frequency filter 19 again to prevent radio wave interference with an external device. A wireless voice transmitter 12 formed of an RF amplifier 22 for amplifying the mixed signal at a) and transmitting the amplified signal to the outside through the antenna ANT2; An oscillator for generating a high frequency signal and an RF amplifier 23 installed in a conventional remote controller capable of controlling the television set and driven by the wireless voice transmitter 12 to amplify the wireless voice signal received through the antenna ANT3. 24, a mixer 25 for mixing the amplified signal and a high frequency signal, an intermediate frequency amplifier 26 for amplifying the mixed signal, and an FM signal of 4.5 MHz in the amplified signal. Filter 27 and 28 for filtering the FM signals of and 4.7242MHZ, and demodulator 29 and the FM signals of 4.7242MHZ. A switch for turning on / off the second audio demodulator 30 for demodulating the two audio signals, the amplifiers 31 and 32 for amplifying the demodulated output and outputting the demodulated output to the outside, respectively. A wireless voice receiver 100 made of (SW2); An audio output selection switch (SW1) installed between the audio intermediate frequency amplifier (6) in the television set and the frequency modulator and demodulator (10) for selectively outputting through the television audio signal speaker (SP); It is installed inside the television set and provides an operating power source (+ Vcc) of the wireless voice transmitter 12 so as to configure the power switch SW4 for turning on / off the wireless voice transmitter 12. Wireless audio receiver that can listen to the audio output. The wireless audio output selection switch (SW1) and the power switch (SW4) of claim 1, characterized in that the on / off under the control of the control unit 14 inside the television set for processing the key signal generated from the remote control. Voice receiver.