JPH0879842A - Wireless reproducing device - Google Patents

Abstract

PURPOSE: To provide a wireless reproducing device in which noise when receiving a weak radio wave is reduced. CONSTITUTION: A music signal reproduced and amplified and an operation code generated by an operation code generating means 15 are mixed by a mixing means 16 and sent by a very weak radio wave by a music transmission means 17. A modulation signal from a reproducing device 2 is demodulated by a music reception means 20. An operation code discrimination means 21 detects an operation code from the demodulated output to discriminate whether or not the code indicates the same operation command designated by an operation button 3 and the demodulated music signal is outputted from a head phone 7 via a sound quality variable means 23. A code error detection means 22 monitors the occurrence of error in the operation code sent simultaneously with the music signal after detecting the operation code. When any error is detected, a sound quality variable means 23 corrects a listening sense of the music signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless playback device for wirelessly transmitting control and music signals,
In particular, by providing the playback device with a control signal reception circuit and a music signal transmission circuit, and by providing the remote control device with a control signal transmission circuit and a music signal reception circuit by operating buttons, a weak radio wave can be generated between the playback device and the remote control device. The present invention relates to a wireless playback device capable of two-way communication.

[0002]

2. Description of the Related Art In recent years, portable audio equipment has a main body, operation,
There is a demand for a wireless system in which the headphones have a completely separate structure.

A conventional wireless reproducing apparatus will be described below. FIG. 9 is a block diagram of this conventional wireless reproducing apparatus, FIG. 10 is a conventional audio signal, operation code and frequency characteristic diagram, and FIG. 11 is a modulation waveform diagram of the operation code.

The wireless playback device has a separate configuration including a remote control device and a playback device. The remote control device transmits a control code to the playback device by weak radio waves, receives the music signal and the operation code from the playback device, and the playback device receives the control code from the remote control to function and functions as a music signal. The operation code is transmitted to the remote control device by weak radio waves.

In FIG. 9, the wireless playback device operates as follows. An operation instruction to the reproducing device 2 such as play by the operation button 3 of the remote controller 1 is coded by the coding processing means 4 and modulated to a high frequency by the code transmitting means 5. The modulated transmission output is the transmission filter 6
Is transmitted from the headphone cord 7 to the playback device 2 via weak radio waves.

For example, the operation button 3 is PLAY 3a, STOP
The operation buttons such as 3b, FF3c, and REW3d are shown.

The modulated signal from the remote control device 1 is obtained from the receiving antenna 8 of the reproducing device 2 and demodulated by the code receiving means 9. The control code discriminating means 10 discriminates the control code from the demodulated output and gives an operation instruction to the main body control means 11. The main body control means 11 that has received the instruction is the tape drive means 1
2 is used to operate the tape 13.

For example, when the control code discrimination means 10 detects a play instruction, the main body control means 11 causes the tape drive means 1 to operate.
2, the reproduction of the tape 13 is started.

A music signal is reproduced in response to a play operation instruction, and at the same time, the operation state of the reproducing apparatus 2 is coded by the operation code generating means 15.

The reproduced music signal from the tape 13 is amplified by the amplifying means 14. The music signal amplified and the operation code generated by the operation code generating means 15 are mixed by the mixing means 1
6 is mixed by 6, is modulated to a high frequency by the music transmitting means 17, and is transmitted from the transmitting antenna 18 to the remote control device 1 by a weak radio wave.

FIG. 10 shows a frequency characteristic diagram of the music signal and the output of the action code generating means 15. For example, the frequency range of the music signal 33 is 10 to 15 kHz, and the operation code 34
Is a modulation signal at 30 kHz so as not to affect the music signal 33.

FIG. 11 shows a modulation waveform diagram of the operation code. For example, the modulation waveform 36 of the operation code 35, which is a digital code, is 30 when the data is H as shown in FIG.
Signal of kHz, converted to no signal when L. Demodulation side is 3
The digital code 35 is demodulated by a waveform shaping comparator through a 0 kHz band pass filter.

The modulated signal from the reproducing device 2 is obtained from the headphone cord 7 of the remote controller 1, and the receiving filter 19 is used.
And is demodulated by the music receiving means 20 via. The operation code discriminating means 21 detects the operation code from the demodulated output and determines whether or not it is the same as the operation instruction designated by the operation button 3. If they are the same, it is determined that the operation instruction has been reliably transmitted to the playback device 2, and the demodulated music signal is output to the power amplifier 24.
It is amplified by and output from the headphones 7.

[0014]

However, in the above-described conventional configuration, when the remote control device 1 and the playback device 2 are separated from each other to the limit point of the reaching distance of the weak radio wave, or due to interference from the outside or the like, the remote control device 1 does not operate. The reception level of the music signal becomes a weak input and noise is generated. The noise level has a audible problem that it increases as the weak input increases.

Further, when two or more same wireless playback devices are used, the control code from the remote control device 1 and the operation code from the playback device are the same, which causes a malfunction.

In order to solve the above-mentioned conventional problems, the present invention receives a modulated signal transmitted from a reproducing device to a remote control device and demodulates it, and detects an operation code from the output of the music receiving device, The operation code discriminating means for discriminating the operation state of the reproducing device, the code error detecting means for detecting an error in the operation code after the operation code is detected, and the sound quality of the music signal transmitted from the reproducing device are changed by the error detection of the operation code. It is an object of the present invention to provide a wireless playback device capable of changing the sound quality of a music signal by providing a sound quality varying means for determining a weak input from a playback device based on an operation code error. It is a thing.

[0017]

In order to achieve this object, the wireless reproducing apparatus of the present invention has an operation button for instructing the remote control device to operate, and a coding process for encoding a remote control signal by operating the operation button. Means and code transmitting means for modulating in accordance with the coded remote control signal and transmitting from the earphone code by a weak radio wave, while the playback device receives the remote control signal transmitted by the remote control device, Code receiving means for demodulating the demodulated remote control signal, control means for controlling a predetermined function of the reproducing device based on the demodulated signal, operation code generating means for encoding the operation state by the control means, and reproducing device. A mixer that mixes the music signal reproduced by the device and the output of the operation code generation means, and a music transmitter that modulates the signal from the mixer and transmits it by a weak radio wave. Further, the remote control device is provided with a music receiving means for receiving and demodulating the modulated signal transmitted from the reproducing device, and an operation code is detected from the output of the music receiving means to determine the operating state of the reproducing device. The operation code discriminating means, the code error detecting means for detecting an error of the operation code after the operation code is detected, and the sound quality changing means for changing the sound quality of the music signal transmitted from the reproducing apparatus by the error of the operation code.

In order to solve the above-mentioned problems, the present invention provides
The remote control device has a sound quality varying means for increasing a sound quality variable range depending on the number of consecutive error of the operation code.

In order to solve the above-mentioned problems, the present invention provides
Identification code random generation means for randomly generating an identification code in the remote control device, a memory for storing the generated identification code, a memory for storing the identification code from the remote control device in the playback device, and an identification code from the remote control device And an identification code discriminating means for discriminating the identification code recorded by the reproducing apparatus.

In order to solve the above-mentioned problems, the present invention provides
And an operation code generating means for combining the operation code indicating the operation state of the reproducing apparatus with the identification code received from the remote control device.

The present invention for solving the above-mentioned problems further provides:
A positive mixer for mixing the first music signal and the output of the operation code generating means into the mixer means of the reproducing device, and a negative mixer for mixing the second music signal and the inverted output of the operation code processing means. On the other hand, on the other hand, in the remote control device, a differential amplifier for taking a differential between the positive operation code superimposed on the first music signal and the negative operation code superimposed on the second music signal from the output of the music receiving means. Have and.

[0022]

According to the present invention, with the above-described configuration, the remote control device determines from the error detection of the operation code that the weak radio wave from the reproduction device is weakly input, and changes the sound quality of the music signal to reduce the noise on the audibility. Can be achieved.

Even when two or more of the same wireless playback device are used, malfunctions can be prevented because the identification code is added to the control code from the remote control device and the operation code from the playback device.

[0024]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a wireless reproducing apparatus according to the first embodiment of the present invention.

In FIG. 1, components having the same construction and operation as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, the operation button 3 of the remote controller 1
An operation instruction to the reproduction device 2 such as play by is encoded by the encoding processing means 4 and is modulated to a high frequency by the code transmitting means 5. The modulated transmission output is transmitted from the headphone cord 7 to the reproduction device 2 via the transmission filter 6.
Is transmitted by weak radio waves.

For example, the operation button 3 is PLAY 3a, STOP
The operation buttons such as 3b, FF3c, and REW3d are shown.

The modulated signal from the remote control device 1 is obtained from the receiving antenna 8 of the reproducing device 2 and demodulated by the code receiving means 9. The control code discriminating means 10 discriminates the control code from the demodulated output and gives an operation instruction to the main body control means 11. The main body control means 11 that has received the instruction is the tape drive means 1
2 is used to operate the tape 13.

For example, when the control code discrimination means 10 detects a play instruction, the main body control means 11 causes the tape drive means 1 to operate.
2 will be used to start the reproduction of the tape 13.

The music signal is reproduced in response to the instruction of the play operation, and at the same time, the operation state of the reproducing apparatus 2 is coded by the operation code generating means 15.

The reproduced music signal from the tape 13 is amplified by the amplifying means 14. The music signal amplified and the operation code generated by the operation code generating means 15 are mixed by the mixing means 1
6 is mixed by 6, is modulated to a high frequency by the music transmitting means 17, and is transmitted from the transmitting antenna 18 to the remote control device 1 by a weak radio wave.

The modulated signal from the reproducing device 2 is obtained from the headphone cord 7 of the remote controller 1, and the receiving filter 19
And is demodulated by the music receiving means 20 via. The operation code discriminating means 21 detects the operation code from the demodulated output and determines whether or not it is the same as the operation instruction designated by the operation button 3. If they are the same, it is determined that the operation instruction has been reliably transmitted to the reproducing apparatus 2, and the demodulated music signal is sent to the sound quality varying means 23.
Is amplified by the power amplifier 24 and output from the headphones 7.

After detecting the operation code, the code error detecting means 22 detects the occurrence of an error in the operation code transmitted simultaneously with the music signal. When an error is detected, the sound quality changing means 23
To correct the audibility of music signals.

The operation of the wireless reproducing apparatus configured as described above will be described below with reference to FIG.

In FIG. 1, the PLAY of the remote controller 1
The playback device 2 is operated by operating the button 3a, and the remote control device 1 detects the PLAY operation code from the playback device 2,
It is determined whether or not it is the same as the operation instruction of the PLAY button 3a. At the same time, the music signal is output from the headphones.

When the remote control device 1 and the reproducing device 2 are separated from each other to the limit point of the reach distance with weak radio waves during use, the reception level at the remote control device 1 becomes a weak input due to external interference, etc. Generates noise and error in operation code. The weak sound wave from the reproducing apparatus is judged to be weak input by detecting the error of the operation code, and the sound quality changing means 2
In step 3, the noise level generated in the music signal is audibly reduced.

As described above, according to this embodiment, after the bidirectional transmission / reception of the remote control device 1 and the reproducing device 2 is confirmed, it is judged by the error detection of the operation code that the weak radio wave from the reproducing device is weak input. Then, the noise level generated in the music signal by the sound quality varying means 23 can be reduced audibly.

FIG. 2 is a flow chart of the code error detecting means of the wireless reproducing apparatus according to the second embodiment of the present invention, and FIG. 3 is a level variable diagram according to the number of consecutive errors in the sound quality varying means.

The present embodiment differs from the first embodiment in that the remote control device is a sound quality varying means for increasing the sound quality varying range depending on the number of consecutive error of the operation code.

The operation of the wireless reproducing apparatus configured as described above will be described below with reference to FIGS. 1, 2 and 3.

In FIG. 1, the PLAY of the remote controller 1
The playback device 2 is operated by operating the button 3a, and the remote control device 1 detects the PLAY operation code from the playback device 2,
A music signal is output from the headphones at the same time as the operation instruction of the PLAY button 3a.

When the remote control device 1 and the playback device 2 are separated from each other to the limit point of the reach distance of weak radio waves during use, the reception level at the remote control device 1 becomes a weak input due to interference from the outside, etc. Generates noise and error in operation code. It is judged from the error detection of the operation code that the weak radio wave from the reproducing apparatus is weakly input, and the sound level varying means 23 reduces the noise level generated in the music signal in terms of hearing.

The variable level of the sound quality varying means 23 changes depending on the number of continuous error detections by the code error detecting means 22.

The change in the variable level will be described with reference to the flowchart of FIG. After detecting the operation code, the error code detecting means 22 monitors the operation code transmitted simultaneously with the music signal. When the erroneous detection of the operation code occurs once due to interference from the outside or the like, the sound quality changing means 23 performs the ATT1 process. If erroneous detection is made two more times in a row, ATT2
Processing, ATT3 processing when erroneous detection is performed three times in a row,
Further, if the error is detected four times in succession, the level of the music signal is changed stepwise according to the number of continuous error of the operation code, such as ATT4 processing.

FIG. 3 shows an example of a level variable diagram according to the number of continuous errors. The level attenuation and the low pass filter characteristics are ATT according to the degree of continuous error shown in FIG.
1, ATT2, ATT3, ATT4 are sequentially changed.

As described above, according to this embodiment, the audible change can be changed without a sense of discomfort by changing the variable level of the sound quality changing means 23 stepwise by the number of consecutive error detections by the code error detecting means 22. .

FIG. 4 is a block diagram of a wireless reproducing apparatus according to the third embodiment of the present invention, and FIG. 5 shows a remote control transmission format.

In FIG. 4, the same components and operations as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The present embodiment is different from the first embodiment in that the remote control device 1 is provided with an identification code random generating means 25 for randomly generating an identification code and a memory 26 for storing the generated identification code. A memory 28 configured to combine the control code corresponding to the operation button 3 of the device 1 and the identification code and send the combined result to the playback device 2, while the playback device 2 stores the identification code from the remote control device 1.
And an identification code discriminating means 2 for discriminating between the identification code from the remote control device 1 and the identification code recorded by the reproducing device 2.
7 is added.

The operation of the wireless reproducing apparatus configured as described above will be described below with reference to FIGS. 4 and 5.

In FIG. 4, the identification code is for preventing malfunction between the same models, and the identification code random generation means 25 is executed, for example, when the power is turned on, and the generated identification code is stored in the memory 26.

An operation instruction to the reproducing device 2 such as play by the operation button 3 of the remote controller 1 is coded by the coding processing means 4, combined with the identification code recorded in the memory 26, and then combined by the code transmitting means 5. It is modulated to high frequency. The modulated transmission output is transmitted from the headphone cord 7 to the reproducing apparatus 2 as a weak radio wave via the transmission filter 6.

FIG. 5 shows an example of a combined format of the control code and the identification code by the encoding processing means 4. The transmission order is a control code, an identification code, an inverted control code, and an inverted identification code. The adoption of each inversion code is to increase the detection rate.

The modulated signal from the remote control device 1 is obtained from the receiving antenna 8 of the reproducing device 2 and demodulated by the code receiving means 9. The control code discrimination means 10 discriminates the control code from the demodulated output. Here, the identification code discriminating means 27 confirms the presence or absence of the memory 28 for storing the identification code, and when there is no memory 28, the identification code from the remote controller 1 is stored in the memory 2.
Store in 8. If there is, the identification code recorded in the memory 28 is compared with the identification code transmitted from the remote controller 1, and if they match, an operation instruction is given to the main body control means 11. The main body control means 11 that has received the instruction causes the tape drive means 12 to operate the tape 13.

As the identification code in the reproducing device 2, the first identification code from the remote control device 1 is stored in the memory 28, and subsequent operation instructions are compared with the identification code stored in the memory 28 and the identification code from the remote control device 1. As a result, malfunction can be prevented.

As described above, according to this embodiment, the remote control device 1 is provided with the identification code random generating means 25 for randomly generating the identification code, and the control code corresponding to the operation button 3 and the identification code are combined and reproduced. The reproduction device 2 is configured to transmit to the device 2, and the reproduction device 2 is provided with the identification code determination means 27 for determining the identification code from the remote control device 1 and the identification code recorded by the reproduction device 2 so that malfunctions due to the same model can be prevented. Can be prevented.

FIG. 6 is a block diagram of a wireless reproducing apparatus according to the fourth embodiment of the present invention.

In FIG. 6, components having the same structure and operation as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The present embodiment is different from the third embodiment in that the operation code generating means 15 of the reproducing apparatus synthesizes the operation code indicating the operation state with the identification code received from the remote controller.

The operation of the wireless reproducing apparatus configured as described above will be described below with reference to FIG.

In FIG. 6, the modulated signal from the remote control device 1 is obtained from the receiving antenna 8 of the reproducing device 2 and demodulated by the code receiving means 9. The control code discrimination means 10 discriminates the control code from the demodulated output. Further, the identification code discriminating means 27 compares the identification code recorded in the memory 28 with the identification code transmitted from the remote controller 1, and when they coincide with each other, gives an operation instruction to the main body control means 11. The main body control means 11 that has received the instruction causes the tape drive means 12 to operate the tape 13.

For example, a music signal is reproduced in response to a play operation instruction, and at the same time, the operation state of the reproducing apparatus 2 is coded by the operation code generating means 15 and a composite code of the operation code and the identification code stored in the memory 28. Is generated.

The reproduced music signal from the tape 13 is amplified by the amplifying means 14. The amplified music signal and the composite code of the operation code and the identification code generated by the operation code generation means 15 are mixed by the mixing means 16, modulated to a high frequency by the music transmission means 17, and transmitted from the transmission antenna 18 to the remote control device 1 by a weak radio wave. Sent by.

The modulated signal from the reproducing apparatus 2 is obtained from the headphone cord 7 of the remote controller 1, and the receiving filter 19
And is demodulated by the music receiving means 20 via. The operation code discriminating means 21 detects the operation code from the demodulated output and determines whether or not the operation instruction is the same as the operation instruction designated by the operation button 3, and the identification code generated by the identification code random generating means 25 and the reproducing device 2. It is determined whether the identification codes of are the same. When the operation code and the identification code are the same, it is determined that the operation instruction has been reliably transmitted to the playback device 2, and the demodulated music signal is amplified by the power amplifier 24 via the sound quality varying means 23 and output from the headphones 7. To do.

After detecting the operation code, the code error detecting means 22 detects the error occurrence of the operation code and the identification code transmitted at the same time as the music signal. When an error is detected, the sound varying means 23 performs the audibility correction of the music signal.

As described above, according to the present embodiment, the operation code generating means 15 generates an operation code indicating the operation state of the reproducing apparatus, synthesizes the operation code and the identification code received from the remote controller, and synthesizes the remote controller. By transmitting the same to the remote controller, it is possible to prevent malfunction of the same model due to the same model.

FIG. 7 is a block diagram of the mixing means in the reproducing apparatus in the fifth embodiment of the present invention, and FIG. 8 shows the input section of the operation code determining means in the remote control device.

In FIG. 7, the same components and operations as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The present embodiment differs from the first embodiment in that the structure of the mixing means 16 is a positive mixer 29 for mixing the first music signal and the output of the action code generating means, and the second music signal. And a negative mixer 30 for mixing the inverted output of the operation code generation means, and the operation code determination means 21 of the remote control device 1.
This is because a differential amplifier 32 that takes a difference between a positive operation code superimposed on the first music signal and a negative operation code superimposed on the second music signal is added to the input section of the.

The operation of the wireless reproducing apparatus configured as described above will be described below with reference to FIGS. 1, 7, and 8.

In FIG. 1, the reproducing device 2 has a stereo output composed of first and second music signals, and the amplifying means 14 amplifies the first music signal and the second music signal according to an operation instruction from the remote controller 1. To do. At the same time, the operation state of the reproducing apparatus 2 is coded by the operation code generating means 15, and the amplified music signal and the operation code generated by the operation code generating means 15 are mixed by the mixing means 16.

FIG. 7 shows the structure of the mixing means 16. The first music signal is mixed by the mixer 29 having the positive output of the operation code generating means 15, and the second music signal is mixed by the negative mixer 30 having the output obtained by inverting 31 of the operation code generating means 15. . The output of the mixing means 16 is transmitted to the remote control device 1 by the music transmitting means 17.

In FIG. 1, the remote control device 1 is a reproduction device 2
Determine the operation code from. FIG. 8 shows the input section of the operation code discriminating means 21 in the remote control device. A differential amplifier 32 that takes a differential between a positive operation code superimposed on the first music signal and a negative operation code superimposed on the second music signal from the music receiving means output 20 is provided, and noise in phase is eliminated. By removing it, the operation code detection rate in the operation code determining means 21 can be increased.

As described above, according to this embodiment, the first music signal, which is a stereo signal, is mixed with the positive operation code and the second music signal is mixed with the negative operation code, and the mixture is transmitted from the reproducing apparatus. In the device, by taking the differential between the positive operation code and the negative operation code, the in-phase noise added on the transmitted radio waves can be removed and the operation code detection rate can be increased.

[0076]

As described above, according to the present invention, the remote control device 1 is provided.
After the bidirectional transmission / reception between the playback device 2 and the playback device 2 is confirmed, it is judged from the error detection of the operation code that the weak radio wave from the playback device is weak input, and the noise generated in the music signal by the sound quality varying means 23. The level can be reduced audibly.

Further, by changing the variable level of the sound quality varying means 23 stepwise by the number of consecutive error detections by the code error detecting means 22, it is possible to change the audible change without a sense of discomfort.

Further, the remote control device 1 is provided with an identification code random generating means 25 for randomly generating an identification code, and is constructed so that the control code corresponding to the operation button 3 and the identification code are combined and transmitted to the reproducing device 2. By providing the identification code discriminating means 27 for discriminating the identification code from the remote control device 1 and the identification code recorded by the reproduction device 2, the reproduction device 2 can prevent malfunction by the same model.

Further, the operation code generation means 15 generates an operation code indicating the operation state of the reproducing apparatus, combines the operation code and the identification code received from the remote control device, and transmits the combined result to the remote control device. It is possible to prevent malfunction by the same model.

Furthermore, a positive operation code is mixed with the first music signal which is a stereo signal, and a negative operation code is mixed with the second music signal, and the mixture is transmitted from the reproducing apparatus. By taking the differential operation code, the in-phase noise added on the transmitted radio wave can be removed and the operation code detection rate can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram of a wireless playback device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of code error detecting means in the second embodiment of the present invention.

FIG. 3 is a level variable diagram in the sound quality varying means in the second embodiment of the present invention.

FIG. 4 is a block diagram of a wireless playback device according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a remote control transmission format in the third embodiment of the present invention.

FIG. 6 is a block diagram of a wireless playback device according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram of a mixing means in a fifth embodiment of the present invention.

FIG. 8 is a diagram showing an input unit of operation code discriminating means in a fifth embodiment of the present invention.

FIG. 9 is a block diagram of a wireless playback device in a conventional wireless playback device.

FIG. 10 is a frequency characteristic diagram of an audio signal and an operation code in a conventional wireless playback device.

FIG. 11 is a modulation waveform diagram of an operation code in a conventional wireless playback device.

[Explanation of symbols]

 1 Remote Control Device 2 Playback Device 3 Operation Button 4 Coding Processing Means 5 Code Transmitting Means 9 Code Receiving Means 10 Control Code Determining Means 15 Action Code Generating Means 16 Mixing Means 17 Music Transmitting Means 20 Music Receiving Means 21 Action Code Determining Means 22 Codes Error detection means 23 Sound quality changing means 25 Identification code random generation means 27 Identification code determination means

Claims (5)

[Claims] 1. A playback device, which is an audio device, and a remote control device for listening using an earphone (or headphones) and performing an operation corresponding to each function control of the playback device. An operation button for instructing, a coding processing means for coding a remote control signal by operating the operation button, and a code transmission means for modulating according to the coded remote control signal and transmitting from the earphone code by a weak electric wave. On the other hand, the reproducing device is provided with a code receiving means for receiving the remote control signal transmitted by the remote control device and demodulating a coded remote control signal, and a predetermined device of the reproducing device based on the demodulated signal. A control means for controlling the function of, a motion code generation means for coding the operation state by the control means, and a music signal reproduced by the reproduction device, A mixer for mixing the output of the operation code generating means and a music transmitting means for modulating the signal from the mixer and transmitting it by a weak electric wave are provided, and the remote control device is transmitted from the reproducing device. A music receiving unit that receives and demodulates the modulated signal, an operation code determining unit that detects the operation code from the output of the music receiving unit, and determines the operation state of the playback device; and the operation code after detecting the operation code. A code error detecting means for detecting an error, and a sound quality varying means for changing the sound quality of a music signal transmitted from the reproducing device by the error of the operation code, and a weak radio wave from the reproducing device is weakly input. A wireless reproduction device characterized in that it is configured to change the sound quality of a music signal by determining that there is an error in an operation code. 2. The wireless reproducing apparatus according to claim 1, wherein the sound quality varying means of the remote control device increases the sound quality varying range according to the number of continuous error of the operation code. 3. A remote control device comprising identification code random generation means for randomly generating an identification code, and a memory for storing the generated identification code, wherein the function code corresponding to an operation button of the remote control device is selected. A memory for storing the identification code from the remote control device in the playback device, and a discrimination between the identification code from the remote control device and the identification code recorded by the playback device And a function for controlling the function of the reproducing apparatus, the function control of the reproducing apparatus is performed only when the identification code from the remote controller matches the identification code recorded by the reproducing apparatus. The wireless playback device according to claim 1 or claim 2. 4. The operation code indicating the operation state of the reproducing apparatus is composed so as to be combined with the identification code received from the remote control device and transmitted. On the other hand, the operation code detecting means of the remote control device detects the operation code. 4. The wireless playback device according to claim 3, wherein it is configured to determine whether the identification code generated by the identification code random generation means and the identification code from the playback device match. 5. The reproducing device provides a stereo output composed of a first music signal and a second music signal, and the mixing means comprises a positive mixer for mixing the first music signal and the output of the operation code generating means. A negative mixer that mixes the second music signal and the inverted output of the operation code generation means, and the positive operation code superimposed on the first music signal from the music reception means output to the remote control device. And a differential amplifier that takes a differential with the negative operation code superimposed on the second music signal, and is configured to increase the code data detection rate in the operation code determination means by removing noise in the same phase. The wireless playback device according to claim 1, wherein the wireless playback device is a wireless playback device.