JPH0774663A - Wireless type audio equipment and its receiver - Google Patents

Abstract

PURPOSE:To realize the wireless type headphone stereo as easy to control as wired type head phone stereos while keeping the service life of battery. CONSTITUTION:In an audio equipment 1, a receiving circuit 45 intermittently accepts a remote control signal from the receiver at the time of a stop mode. The receiver turns off the power of the transmitting circuit and receiving circuit at the stop mode. When a remote control signal which directs an operation mode other than the stop mode from the receiver, the receiving circuit 45 of the audio equipment 1 performs reception in succession. The audio equipment 1 becomes the operation mode according to the remote control signal. When a remote control signal which directs the stop mode is sent from the receiver at the operation mode, the audio equipment 1 becomes the stop mode and the receiving circuit 45 of the audio equipment 1 performs intermittent reception.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless audio device such as a so-called headphone stereo and its receiver.

[0002]

2. Description of the Related Art As a headphone type stereo cassette player (hereinafter referred to as "player") such as Walkman (registered trademark), a wireless system between the player and the headphone is considered.

FIG. 13 is a perspective view showing the appearance of an example of the wireless cassette player, 1 is a player, and 6 is a dedicated receiver for the headphones.

Then, in the player 1, during reproduction, the stereo audio signals L and R of the left and right channels are reproduced from the tape cassette (not shown), and the signals L and R are reproduced.
R is converted into FM signals SL and SR having a predetermined frequency, and these signals SL and SR are transmitted to the receiver 6.

Then, in the receiver 6, the player 1
When the FM signals SL, SR from the
Audio signals L and R are demodulated from L and SR, and the signals L and R are demodulated.
Are supplied to the left and right acoustic units 7L and 7R of the headphone 7, respectively.

Further, the player 1 and the receiver 6 are provided with a remote control function. That is, in the receiver 6,
When the operation key 85 is operated, an FM signal SRC of data indicating the operated key is formed, and this FM signal SRC is transmitted to the player 1. When the player 1 receives the FM signal SRC, the original data is extracted from the signal SRC, and the operation mode of the player 1 is controlled according to this data. Therefore, the player 1 is remote-controlled in the reproduction mode, the stop mode, or the like.

In this case, the receiver 6 can be half the size of a business card or less. Also, the distance that the receiver 6 can be used away from the player 1 is set to about 1.5 m in consideration of the Radio Law and the case where a nearby person uses the same wireless player.

Therefore, according to this wireless type player, for example, when listening to a cassette on a commuter train, the player 1 is put in a bag, a bag or the like, and the receiver 6 is put in a chest pocket of a jacket. , The clip can be attached to a tie or the like by using the clip, and the cord of the headphone 7 does not get in the way.

[0009]

However, when the above-mentioned wireless player 1 is used for the first time, (1) the standby switch 3 of the player 1 is turned on and the power of the receiving circuit of the remote controller of the player 1 is turned on. To (2) Turn on the power switch of the receiver 6. (3) Press the play key among the operation keys 8 of the receiver 6. Operation is required.

To stop using the player 1, (4) press the stop key among the operation keys 8 of the receiver 6. (5) Turn off the power switch of the receiver 6. (6) Turn off the standby switch 3 of the player 1 to turn off the power of the receiving circuit of the remote controller of the player 1. Operation is required.

However, such an operation is considerably troublesome as compared with the case where an ordinary player (not a wireless type) can set the reproduction mode or the stop mode by merely operating the reproduction key or the stop key. Also, if the operation in item (5) or (6) is forgotten, the battery will be wasted, and when the next regeneration is performed, the battery may be dead and regeneration cannot be performed.

The present invention is intended to solve such a problem.

[0013]

For this reason, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the audio equipment 1 and the receiver 6 thereof for transmitting an audio signal wirelessly are provided. The audio device 1 includes a reproduction circuit 10 for reproducing an audio signal,
A transmission circuit 20 for transmitting an audio signal from the reproduction circuit 10, a reception circuit 45 for receiving a remote control signal from the receiver 6, and an operation mode of the audio device 1 according to the remote control signal received by the reception circuit 45. The receiver 6 has at least a control circuit 32 for switching between the stop mode and the reproduction mode, and the receiver 6 receives the signal transmitted from the transmission circuit 20 and the audio signal from the reception circuit 60. The sound unit 7 for converting into sound, a remote control signal transmission circuit 94 for remote-controlling the audio device 1, and an operation key 85 for remote control,
When the audio device 1 and the receiver 6 are in the stop mode, the power supply of the transmitting circuit 20 of the audio device 1 is off, and the receiving circuit 45 receives the remote control signal from the receiver 6 intermittently. And receiver 6
When the power supply of the transmission circuit 94 and the reception circuit 60 is off and the remote control signal for instructing the operation mode other than the stop mode is transmitted from the receiver 6, the reception circuit 45 of the audio device 1 continuously operates. When receiving a remote control signal instructing the stop mode from the receiver 6 when the audio device 1 is in an operation mode according to the remote control signal and is in an operation mode other than the stop mode. , The audio device 1 enters the stop mode, and the receiving circuit 4 of the audio device 1
Reference numeral 5 is for intermittent reception.

[0014]

The receiving circuit 45 of the audio device 1 intermittently receives the remote control signal from the receiver 6 in the stop mode. Therefore, the operation is the same as that of an ordinary non-wireless audio device.

[0015]

1 and 2 show an example of a signal system of a wireless cassette player 1 and a dedicated receiver 6 for headphones thereof. In the player 1, 2 is a cassette magnetic tape, 10 is a reproducing circuit, 20 is a transmitting circuit,
Reference numeral 31 is a tape running mechanism, 32 is a microcomputer for system control, and 33 is operation keys such as a play key and a stop key.

In this case, although not shown, the tape running mechanism 31 has a capstan, a pinch roller, a capstan motor, a plunger, etc., and the lever is triggered by the plunger to utilize the rotational force of the capstan motor. The player 1 controls the mechanical state of the player 1 to a stop mode, a reproduction mode, or the like.

When the play key of the operation keys 33 is pressed, the running mechanism 31 is controlled by the microcomputer 32 to set the mechanical operation mode of the player 1 to the play mode, the tape 2 is run at a constant speed, and the play is performed. Head 11L,
11R reproduces the audio signals L and R of the left and right channels from the tape 2. Then, the reproduction signals L and R are supplied to the FM modulation circuits 22L and 22R through the signal lines of the reproduction equalizer amplifiers 12L and 12R and the pre-emphasis circuits 21L and 21R, and are converted into FM signals SLO and SRO.

In this case, the frequency deviation of the FM signals SLO and SRO is set to 75 kHz at a modulation factor of 100%, and the carrier frequencies fLO and fRO of the FM signals SLO and SRO are set.
Is set to be considerably lower than the transmission frequencies (carrier frequencies) fL and fR of the actual transmission signals SL and SR, for example, fLO = 11.29 MHz fRO = 11.75 MHz.

The FM signals SLO and SRO are supplied to the mixer circuits 23L and 23R, and the local oscillation circuit 24 supplies the beat-up local oscillation signal S24 to the mixer circuits 23L and 23R. The signal S24
The frequency f24 of is, for example, f24 = 64.00 MHz.

Thus, the signals SLO and SRO are converted into FM signals SL and SR whose carrier frequencies fL and fR are, for example, fL = fLO + f24 = 75.29 MHz fR = fRO + f24 = 75.75 MHz by the signal S24 in the mixer circuits 23L and 23R. Frequency converted.

The FM signals SL, SR are supplied to the bandpass filters 25L, 25R and the power amplifier 26L.
It is supplied to the antenna 27 through 26R and transmitted to the receiver 6.

On the other hand, in the receiver 6, reference numeral 60 represents a receiving circuit. Then, the FM signals SL and SR transmitted from the player 1 are received by the antenna 61, and the signals S
L and SR are the antenna tuning circuit 62 and the high frequency amplifier 63.
A local oscillation signal S65 is supplied from the local oscillation circuit 65 to the mixer circuit 64 while being supplied to the mixer circuit 64 through the. In this case, the frequency f65 of the signal S65 is, for example, f65 = 65.05 MHz.

In this way, the FM signals SL and SR are supplied to the mixer circuit 64 by the signal S65 so that the frequencies fLI and fRI can be obtained.
Is converted into intermediate frequency signals SLI and SRI of fLI = fL-f65 = 10.24 MHz fRI = fR + f65 = 10.70 MHz, for example.

The signals SLI and SRI are supplied to the FM demodulation circuits 68L and 68R through the intermediate frequency filters 66L and 66R and the amplifiers 67L and 67R to demodulate the audio signals L and R, and the signals L and R are demodulated. Emphasis circuits 69L and 69R and output amplifiers 71L and 71
It is supplied to the acoustic units 7L and 7R of the headphone 7 through R respectively.

Further, in order to display the operation mode of the player 1 and the like on the display of the receiver 6, the following configuration is provided.

That is, generally, the processing contents of the microcomputer 32 are not so complicated, and the processing speed is not required to be so high. The original oscillation frequency of a so-called digital timepiece is 32.768 kHz, but the crystal oscillator for oscillation is mass-produced at low cost.

Therefore, in the player 1 of FIG. 1, the clock frequency of the microcomputer 32 is set to 32.768 kHz, and the clock SCK is supplied to the modulation circuit 42 through the buffer amplifier 41 as a carrier signal.

In the microcomputer 32, the player 1
The mode data DMD indicating the operation mode and the like are formed. In this case, as an example, in the data DMD, one word has 4 bits, and its bit 0 (LSB) indicates which side of the cassette A or B is being reproduced, and the remaining bits 1 to 3 are: The operation mode of the player 1 is indicated.

The mode data DMD is serially output from the microcomputer 32 as shown in FIG. 5A, and also represents bits "0" and "1" depending on the difference in pulse width. ing. Further, when the mode data DMD is output from the microcomputer 32, as shown in FIG. 5B, the mode data DMD has a synchronizing pulse SYN at the beginning thereof for a predetermined period of "1" and thereafter for a predetermined period of "0". .

Then, for example, in the reproduction mode, the data DMD having this synchronizing pulse SYN is repeatedly output from the microcomputer 32 as shown in FIG. 5C. The period TMD of one set of data DMD is set to, for example, about 40 msec.

Then, this mode data DMD is supplied to the modulation circuit 42 as a modulation signal, and in the modulation circuit 42, the clock SCK is amplitude-modulated by the mode data DMD (data DMD and data DMD, as shown in FIGS. AND logic with the clock SCK is performed), and mode data DMD
The clock SCK is taken out as the modulated signal SMD only when the level of is at "1".

The modulated signal SMD is supplied to the high-pass filter 43 to remove the audible band signal component (mainly data DMD), and the signal SMD from which the audible band component has been removed is supplied to the modulation circuit 22R. Is added to the audio signal R of the right channel.

Therefore, in the modulation circuit 22R,
The addition signal (R + SMD) of the audio signal R and the modulated signal SMD (subcarrier frequency is 32.768 kHz) is converted into the FM signal SR as described above, and this FM signal SR is, together with the FM signal SL of the left channel, It is transmitted to the receiver 6. At this time, since the signal SMD has passed through the high pass filter 43, it has a differential waveform as shown in FIG. 6D.

On the other hand, in the receiver 6, the demodulation circuit 68
The audio signal L is taken out from L, and the demodulation circuit 68R
The addition signal (R + SMD) is taken out from. For this reason,
A high cut characteristic for removing the modulated signal SMD is also added to the de-emphasis circuit 69R (and 69L), and only the audio signal R is supplied to the amplifier 71R.

Further, the addition signal (R + SMD) from the demodulation circuit 68R is supplied to the high-pass filter 81 to extract the modulated signal SMD, and this signal SMD is supplied to the waveform shaping circuit 82, as shown in FIG. 6C. The original binary signal SMD is shaped, and the binary signal SMD is supplied to the microcomputer 83.

Then, the microcomputer 83 decodes the bit pattern of the original mode data DMD from the supplied signal SMD to detect the operation mode of the player 1 and the like, and displays the display data according to the detection output. The display data thus formed is supplied to the LCD 84, and the operation mode of the player 1 and the like are displayed on the LCD 84.

Further, since the player 1 is remote-controlled from the receiver 6, it is constructed as follows. That is,
The receiver 6 is provided with an operation key 85 for remote-controlling the player 1 to a reproduction mode, a stop key, etc. When the key 85 is pressed, the corresponding command data DCMD is taken out. The command data DCMD has the same format as the MD data DMD.

The receiver 6 is provided with circuits 91 to 93 similar to the circuits 41 to 43 of the player 1, and the high-pass filter 93 provides a modulated signal SCMD similar to the modulated signal SMD, that is, the carrier. Frequency is 32.768 kHz
Then, the modulated signal SCMD having a differential waveform, which is amplitude-modulated by the command data DCMD, is taken out.

This signal SCMD is transmitted to the transmission circuit 94.
To be an FM signal SRC, which is transmitted from the antenna 95 to the player 1. In this case, the carrier frequency f94 of the FM signal SRC is, for example, f
94 = 222.30 MHz.

On the other hand, in the player 1, the FM signal SRC from the receiver 6 is received by the antenna 44 and supplied to the receiving circuit 45. From the receiving circuit 45, the modulated signal SRC is received.
CMD is retrieved. Then, this signal SCMD is supplied to the waveform shaping circuit 47 through the high-pass filter 46 and shaped into the original binary signal SCMD, and this binary signal SCMD is supplied to the microcomputer 32.

Then, the microcomputer 32 decodes the bit pattern of the original command data DCMD from the supplied signal SCMD to detect the operated key of the operation keys 85, and outputs the detected output. Therefore, the traveling mechanism 31 and the like are controlled, and the operation mode of the player 1 is controlled.

Further, in the player 1, the muting signal SWWMT is supplied from the microcomputer 32 to the pre-emphasis circuits 21L and 21R. Also in the receiver 6, the muting signal SRXMT is supplied from the microcomputer 83 to the amplifiers 71L and 71R, and the oscillation circuit 86 is provided. The oscillation circuit 86 is controlled by the microcomputer 83 to extract the beep sound signal SBP. This signal SBP is supplied to the amplifiers 71L and 71R.

Further, in order to make the key operation when changing from the stop mode to the reproduction mode or from the reproduction mode to the stop mode the same as that of an ordinary player (not a wireless type), the following configuration is further provided. To be done.

That is, FIGS. 3 and 4 show an example of the power supply system of the player 1 and the receiver 6. And player 1
4 indicates a rechargeable battery for power supply, which is a nickel-cadmium battery having a terminal voltage of 1.2 V and a capacity of 600 mAh in this example.

The output terminal of the battery 4 is connected to the power supply terminal VDD of the microcomputer 32 and also connected to the power supply lines of the circuits 45 to 47 through the emitter / collector of the switching transistor Q11. Further, the output terminal of the battery 4 is connected to the circuits 10, 20, 31, 4 through the emitter-collector of the switching transistor Q12.
It is connected to the power supply lines 1-43. A predetermined control signal is supplied from the microcomputer 32 to the bases of the transistors Q11 and Q12, and the transistors Q11 and Q12 are on / off controlled.

Further, the player 1 is provided with a switch 34 which is turned on when the tape cassette 2C storing the tape 2 is set therein, and the switch 34 is connected to the microcomputer 32. The microcomputer 32 has a timer function.

In the receiver 6, reference numeral 8 denotes a rechargeable battery for power supply, which is similar to the battery 4 of the player 1, for example. The output terminal of the battery 8 is connected to the power supply terminal VDD of the microcomputer 83 and also connected to the power supply lines of the circuits 60, 81 and 82 through the emitter / collector of the switching transistor Q61.

Further, the output terminal of the battery 8 is connected to the power supply lines of the circuits 91 to 94 through the emitter and collector of the switching transistor Q62. A predetermined control signal is supplied from the microcomputer 83 to the bases of the transistors Q61, Q62, and the transistors Q61, Q62 are on / off controlled.

The following operations are performed by the microcomputers 32 and 83 executing predetermined processing in accordance with the operation of the key 85 and the like.

When no cassette is set in the player When the cassette 2C is not set in the player 1, this is detected by the microcomputer 32 through the switch 34, and the microcomputer 32 is in the power down mode (sleep mode). In addition, the transistor Q11,
Q12 is turned off. Therefore, in this state, only the microcomputer 32 consumes the battery 4, and the current consumption is about 20 to 30 μA.

At this time, since the receiver 6 is not used and is in the stop mode, the microcomputer 83 is also in the power down mode. In addition, the transistor Q6
1, Q62 is also turned off. The LCD 84 is also off. Therefore, in this state, only the microcomputer 83 consumes the battery 8, and its current consumption is
It will be about 20 to 30 μA.

Thus, when the cassette 2C is not set in the player 1, the player 1 and the receiver 6
Has a current consumption of almost zero.

The cassette is set in the player, but in the stop mode This is the case where the cassette 2C is set in the player 1 but the player 1 and the receiver 6 are not used.

That is, when the cassette 2C is set in the player 1, the microcomputer 32 is triggered by the output of the switch 34, and as shown on the left side of FIG.
The output signal of the transistor Q11 turns on the transistor Q11 every period TRX in the period TS. Therefore, the voltage of the battery 4 is supplied to the circuits 45 to 47 through the transistor Q11 as the operating voltage for each period TRX.
47 becomes an operating state intermittently for each period TRX. However, TRX> TMD.

Therefore, when the cassette 2C is set in the player 1, the circuits 45 to 47 cause the circuits 45 to 47 to perform the operation every period TRX.
The FM signal SRC from the receiver 6 can be received.
In this case, as an example, TS = 680 msec and TRX = 64 msec. Also, the transistor Q12 remains off.

The total current consumption during the period TRX is about 10 mA, and during the period other than the period TRX in the period TS, the microcomputer 32 only operates as an interval timer, and the current consumption is several tens of μA. is there.

Therefore, the average current consumption of the player 1 in this stop mode is 64 msec / 680 msec × 10 mA + several tens μA≈1.0 mA.

Furthermore, at this time, since the receiver 6 is not used, the microcomputer 83 is in the power down mode as in the case of, and the transistor Q6
1, Q62 is also off.

Thus, even when the cassette 2C is set in the player 1, the player 1 continues to be in the stop mode. However, in this case, even in the stop mode, the FM signal SRC from the receiver 6 can be received every period TRX. However, at this time, the current consumption of the player 1 is about 1 mA on average. The receiver 6 is also in the stop mode, and its current consumption is almost zero.

When changing from the stop mode to the reproduction mode In this case, as shown in FIG. 7A, reproduction of the operation key 85 of the receiver 6 is performed at an arbitrary time t10 when the player 1 is in the stop mode. Press the key.

Then, by pressing this reproduction key, the operation mode of the microcomputer 83 is switched from the power down mode to the normal mode at time t10. And
The output signal of the microcomputer 83 turns on the transistor Q61 from time t10, and as shown in FIG.
From 10, the voltage of the battery 8 is supplied as its operating voltage to the circuits 60, 81 and 82 through the transistor Q61.

Therefore, from time t10, the circuits 60, 8
1, 82 are in the operating state. However, as shown in FIG. 7C, at time t10, SRXMT remains at “L”, and this signal SRXMT causes muting of the signals from the de-emphasis circuits 69L and 69R in the amplifiers 71L and 71R. It is hung.

Further, according to the output signal of the microcomputer 83,
From time t10, the transistor Q62 is turned on, and as shown in FIG. 7D.
As shown in, the voltage of the battery 8 is supplied as the operating voltage to the circuits 91 to 94 through the transistor Q62 from the time t10. Therefore, from time t10, the circuits 91 to 9 are
4 becomes the operating state.

Then, when the state of the circuits 91 to 94 becomes stable, for example, at a time point t11 after 200 msec from the time point t10, as shown in FIG. 7E, in the microcomputer 83, command data DCMD for instructing the reproduction mode is formed. To be done.
In this case, as shown in FIG. 7E, the data DCMD is repeatedly formed from the time t11 to the period TCMD. Also, TCMD ≧ TS.

Then, this data DCMD is converted into the FM signal SRC by the circuits 91 to 94 as described above,
It is transmitted to the player 1 in the period TCMD.

When the transmission of the FM signal SRC is completed, the transistor Q62 is turned off by the output signal of the microcomputer 83 at time t13, as shown in FIG.
The operating voltage to ~ 94 is no longer supplied, and the FM signal SRC is no longer transmitted from time t13.

Further, as shown in FIG. 7F, from the time point t11, predetermined display data is supplied from the microcomputer 83 to the LCD 84, and a symbol or a character indicating the reproduction mode is displayed blinking on the LCD 84. Further, as shown in FIG. 7G, at time t12, for example, 50 ms after time t11,
Oscillation circuit 8 for 100 msec from this time t12
6 is activated to form a beep sound signal SBP, and this signal SBP is supplied to the left and right acoustic units 7L and 7R of the headphones 7 through the amplifiers 71L and 71R.

Therefore, the user can confirm that the reproduction key has been pressed by the beep sound from the headphones 7 and can also know that the player 1 is shifting to the reproduction mode by the blinking display of the LCD 84.

At time t14, for example, 1.2 seconds after time t10, as shown in FIG. 7C, the muting signal SRXMT becomes "1", and the muting in the amplifiers 71L and 71R is released. Therefore, if the FM signals SL and SR are transmitted from the player 1, the audio signals L and R can be heard from the time point t14.

On the other hand, the player 1, when in the stop mode, executes the intermittent reception of the FM signal SRC every period TRX, as described in. And time t
The FM signal SRC is repeatedly transmitted from 11 over the period TCMD.

Therefore, in the first reception period TRX after the time point t11, the FM signal SRC is received by the reception circuit 45, and the command signal S for instructing reproduction from the shaping circuit 47.
CMD is output, and this signal SCMD is supplied to the microcomputer 32.

The first reception period T after this time t11
The start time of RX is time t21 as shown in FIG. 7H. Further, the time t10 at which the play key is operated is arbitrary,
The interval between the time point t10 and the time point t21 is indefinite depending on the width of the period TS, and therefore the code of the time point t21 to the time point t25 is used for the operation of the player 1.

Then, the microcomputer 32 decodes the bit pattern of the original command data DCMD from the supplied signal SCMD, detects that the reproduction key of the operation keys 85 has been operated, and According to the detection output, time t22 after the period TRX from time t21
After that, the transistor Q11 is continuously turned on, and as shown in FIG.
As shown in H, the operating voltage is continuously supplied to the circuits 45 to 47 after the time t22, and the circuits 45 to 47 are continuously supplied.
7 is set to the continuous reception state.

Further, as shown in FIG. 7I, the microcomputer 32 also turns on the transistor Q12 from time t22, and after time t22, the operating voltage is also supplied to the circuits 10 to 43. Therefore, after time t22, the operating voltage is supplied to all the circuits of the player 1.

Then, at time t23, the traveling mechanism 31 is controlled by the microcomputer 32 as shown in FIG. 7J.
The running mechanism 31 is changed from the stop mode to the playing mode from the time point t23 to the time point t24 and is set to the playing mode at the time point t24, and the tape 2 starts running at the speed at the time of playing. Then, as shown in FIG. 7K, at the time point t25, the muting signal SWMMT becomes "1" and the muting in the pre-emphasis circuits 21L and 21R is released, and from the time point t25, the signals L and R change to the FM signal SL,
It will be converted to SR and transmitted.

Further, at time t25, as shown in FIG. 7L, the microcomputer 32 repeatedly outputs the mode data DMD indicating the reproduction mode.
Is converted into the modulated signal SMD and then the audio signal R
Will be multiplexed and transmitted. That is, from the time t25, the audio signals L and R and the mode data DMD indicating the reproduction mode are transmitted to the receiver 6 by the FM signals SL and SR.

Therefore, from time t25, the audio signals L and R reproduced by the player 1 can be heard through the headphones 7 of the receiver 6.

Further, as shown in FIG. 7F, at time t26 which is delayed from the time t25 by the processing time of the microcomputer 83 or the like, predetermined display data based on the transmitted data DMD is supplied from the microcomputer 83 to the LCD 84. , LC
At D84, symbols or characters indicating the reproduction mode are continuously displayed.

Thus, when the cassette 2C is set in the player 1, even if the player is in the stop mode, pressing the play key of the operation keys 85 of the receiver 6 causes the player 1 to enter the play mode, and the play sound is reproduced. Can be heard through the headphones 7 of the receiver 6. Further, the LCD 84 of the receiver 6 is displayed to indicate that the mode is the reproduction mode.

During Reproduction In this case, the state after time t26 in FIG. 7 is held. That is, in the player 1, the audio signals L and R are reproduced from the tape 2 and transmitted to the receiver 6. Further, the mode data DMD indicating the reproduction mode is repeatedly output from the microcomputer 32, and this data DMD is also continuously transmitted to the receiver 6. Further, the circuits 45 to 47 are continuously supplied with the power supply voltage and are always in the operating state and ready to receive the FM signal SRC.

Further, in the receiver 6, the audio signals L and R transmitted from the player 1 are sent to the headphones 7.
Is being supplied to. In addition, the mode data DMD indicating the reproduction mode continuously transmitted from the player 1 indicates that the LCD 84 is in the reproduction mode. However, the operating voltage is not supplied to the circuits 91 to 94, and therefore the FM signal SRC for remote controlling the player 1 is not transmitted.

When changing from the reproduction mode to the stop mode In this case, as shown in FIGS. 8A and 8F, when the player 1 is in the reproduction mode, the receiver 6 is set at an arbitrary time t30.
Press the play key among the operation keys 85 of
Before 30 is playing, the same as after time t26 in FIG. 7).

Then, by pressing this stop key, as shown in FIG. 8C, at time t30, SRXMT = "L".
Then, in the amplifiers 71L and 71R, muting is applied to the signals L and R from the de-emphasis circuits 69L and 69R.

Further, according to the output signal of the microcomputer 83,
From time t30, the transistor Q62 is turned on, and as shown in FIG. 8D.
As shown in, the voltage of the battery 8 is supplied as the operating voltage to the circuits 91 to 94 through the transistor Q62 from time t30. Therefore, from time t30, the circuits 91 to 9 are
4 becomes the operating state.

At a time point when the states of the circuits 91 to 94 are stabilized, for example, at a time point t31 which is 200 msec after the time point t30, as shown in FIG. To be done.
In this case, as shown in FIG. 8E, the data DCMD is repeatedly formed from the time point t31 to the period TCMD.

Then, this data DCMD is converted into the FM signal SRC by the circuits 91 to 94 as described above,
It is transmitted to the player 1 in the period TCMD.

When the transmission of the FM signal SRC is completed, the transistor Q62 is turned off by the output signal of the microcomputer 83 at the time t34 as shown in FIG.
The operating voltage to ~ 94 is no longer supplied, and the FM signal SRC is no longer transmitted from time t34.

Further, as shown in FIG. 8F, from the time point t31, predetermined display data is supplied from the microcomputer 83 to the LCD 84, and the LCD 84 blinks and displays a symbol or character indicating the stop mode. Further, as shown in FIG. 8G, at time t32, for example, 50 msec after time t31,
Oscillation circuit 8 for 100 msec from this time t32
6 is activated to form a beep sound signal SBP, and this signal SBP is supplied to the left and right acoustic units 7L and 7R of the headphones 7 through the amplifiers 71L and 71R.

Therefore, the user can confirm that the stop key is pressed by the beep sound from the headphones 7 and can know that the player 1 is shifting to the stop mode by the blinking display of the LCD 84.

On the other hand, when the player 1 is in the reproduction mode, as described in the above, the player 1 is in a state of being able to continuously receive the FM signal SRC. Then, from the time t31, the period TCM
The FM signal SRC is repeatedly transmitted over D.

Therefore, at time t31, the FM signal SRC is received by the receiving circuit 45, the command signal SCMD for instructing stop is output from the shaping circuit 47, and this signal SCMD is supplied to the microcomputer 32.

Then, in the microcomputer 32, the bit pattern of the original command data DCMD is decoded from the supplied signal SCMD, and it is detected that the stop key of the operation keys 85 is operated, and from time t31 At time t33 delayed by the time required for the detection, as shown in FIG. 8J, the traveling mechanism 31 is controlled by the microcomputer 32, and the reproduction mode is changed to the stop mode from time t33 to time t35. In the stop mode, the tape 2 stops running.

Further, as shown in FIG. 8K, at the time t33, the muting signal SWMMT becomes "0" and the muting in the pre-emphasis circuits 21L and 21R is turned on, and the signals L and R are changed from the time t33. Muted.

Then, as shown in FIG. 8L, at time t36, for example, 500 msec after time t35, the microcomputer 32
Mode data DMD indicating that the mode is the stop mode is repeatedly output. The data DMD is converted into the modulated signal SMD and then transmitted as the FM signal SR.

At time t39, which is 9 seconds after the time t35, as shown in FIGS.
As a result, the transistors Q11 and Q12 are turned off and the operating voltages of all circuits are turned off. Further, similarly to the time t39 to the time before time t10, the microcomputer 32 alternately repeats the power down mode and the normal mode, and the intermittent reception of the circuits 45 to 47 is restarted every period TRX.

Further, the receiver 6 receives the mode data DMD indicating the stop transmitted from the player 1 from the time point t36, but as shown in FIG. 8F, the microcomputer 83 or the like from the time point t36. At time t37, which is delayed by the processing time, from the microcomputer 83 to the LCD 84,
Predetermined display data based on the transmitted mode data DMD is supplied, and a symbol or character indicating the stop mode is continuously displayed on the LCD 84.

At time t38, which is, for example, 5 seconds after time t37, the transistor Q61 is turned off by the microcomputer 83 and the circuits 60, 81 and 8 are turned on, as shown in FIG. 8B.
The operating power supply of No. 2 is turned off. Further, from time t38, the microcomputer 83 also enters the power down mode. Therefore,
As shown in FIG. 8F, the display on the LCD 84 disappears from the time point t38. Thus, the receiver 6 operates from the time point t38 to the time point t10.
Enter stop mode as before.

As described above, when the player 1 is in the reproduction mode and the stop key of the operation keys 85 of the receiver 6 is operated, the player 1 and the receiver 6 are in the stop mode. Also, when it goes into its stop mode, this is LC
It is displayed on D84 for a predetermined period.

Forced power-off of receiver This is used in the following cases. That is, when the stop key of the receiver 6 is pressed in the reproduction mode, the player 1 is switched from the reproduction mode to the stop mode as described in, but the receiver 6 is transmitted from the player 1 in the period t36 to t39. When the mode data DMD indicating the stoppage of the signal cannot be normally received due to noise or the like, the power of the receiver 6 is not turned off even at time t38, and the battery 8
Will be wasted.

The process for avoiding such trouble is the process of "forced power-off of receiver". That is, when the power of the receiver 6 is not turned off at the time point t38, as shown in FIG. 9, the state before the time point t37 continues after the time point t38, and the LCD 84 displays a symbol or character indicating the stop mode. However, the blinking display continues after time t38, and the user is informed that the power of the receiver 6 is not turned off.

Therefore, as shown in FIG. 9A, the stop key of the operation keys 85 is again pressed and held for a predetermined long period from an arbitrary time point t40 after the time point t38, for example, for three seconds until the time point t45.

Then, the same processing as the period from t30 to t34 is executed from the time t40, but when the time t44 corresponding to the time t34 is reached, since the stop key is still pressed, the microcomputer 83 forcibly turns off the power supply. Is determined. As a result, the time t45 when the stop key is no longer pressed.
From time t46 of 125 msec, for example, the microcomputer 83
As a result, the transistor Q61 is turned off, and the circuits 60 and 8
The operating power supplies 1, 82 are turned off. Furthermore, time point t46
Therefore, the microcomputer 83 also enters the power down mode. Therefore, as shown in FIG. 9F, the display on the LCD 84 disappears from the time point t46. In this way, the power of the receiver 6 is forcibly turned off, and the stop mode is entered from the time point t46 to the time point before the time point t10.

Prevention of Malfunction As described above, when the cassette 2C is set in the player 1, even if the player 1 is in the stop mode, the reproduction key of the operation keys 85 of the receiver 6 is pressed. When pressed, the player 1 enters the reproduction mode. Similarly, if the cassette 2C is set in the player 1,
Even in the stop mode, when the fast-forward key or the rewind key of the operation keys 85 of the receiver 6 is pressed, the player 1 enters the fast-forward mode or the rewind mode.

Therefore, for example, when a player 1 gets on a train and another player uses a similar player and a receiver nearby, even if he / she does not use the player 1 himself, the player 1 Also changes from stop mode to another operating mode. Especially, when his player 1 is set to the auto-repeat mode and a nearby user remote-controls it to the reproduction mode, the player 1 enters the reproduction mode, and thereafter, the forward reproduction and the backward reproduction alternate. Therefore, the battery 4 is wastefully consumed, and the battery 4 becomes empty at the end.

The process for avoiding such trouble is the "malfunction prevention process".

That is, in this case, for example, as shown in FIG.
As indicated by 0, a signal SSENS that becomes "0" when the player 1 is in the stop mode and becomes "1" when the player 1 is in another operation mode is extracted from the microcomputer 32. And
This signal SSENS is supplied to the receiving circuit 45 as a control signal of its receiving sensitivity, and the receiving sensitivity of the receiving circuit 45 is SSE.
When NS = "0", the sensitivity is lowered (for example, about 1/2 of the maximum sensitivity), and when SSENS = "1", the sensitivity is maximized.

Therefore, when the player 1 is in the stop mode, the receiving sensitivity of the receiving circuit 45 is low. In addition, when another user uses the same player and receiver nearby, the remote controller F
Even if the M signal SRC is transmitted, the FM signal SRC
The reception level when your player 1 receives RC is
It is smaller than the reception level when receiving the FM signal SRC from the own receiver 6.

As a result, even if another user performs remote control from the stop mode to, for example, the reproduction mode, the FM of that remote control is used.
The signal SRC cannot be substantially received by the player 1, and the player 1 remains in the stop mode.

However, when the remote control is performed from one's own receiver 6 to, for example, the reproduction mode, the FM signal SRC of the remote controller is generally at a level higher than the FM signal SRC sent from the receivers of other users. The player 1 can receive the FM signal SRC of the remote control from the receiver 6 of itself, so that the player 1 is in the reproduction mode.

In this way, even if another user nearby uses the same player and receiver, his or her own player 1 does not malfunction, and without knowing, the player 1 continues the repeat reproduction and the battery 4 becomes empty. It is possible to prevent troubles such as being

In the prevention of malfunction (other example), malfunction is prevented by changing the reception sensitivity of the receiving circuit 45. In this case, malfunction does not occur while the reception sensitivity of the receiving circuit 45 is changed. This is the case when the above is prevented.

That is, in this case, the microcomputer 3
The control signal SSENS of the receiving sensitivity from 2 to the receiving circuit 45 is not supplied, and the receiving circuit 45 is always kept at the maximum sensitivity.

In the receiver 6, for example, FIG.
As shown in, the audio signals L and R from the amplifiers 71L and 71R are supplied to the acoustic units 7L and 7R of the headphones 7 through the high frequency choke coils 72L and 72R, respectively. Further, the output end of the transmission circuit 94 is connected to the cord of the acoustic unit 7R through the capacitor 96, and the cord of the acoustic unit 7R is used in place of the transmission antenna 95.

Furthermore, when "when changing from the reproduction mode to the stop mode" is executed by pressing the stop key of the receiver 6, in the case of, as shown in FIGS.
Nothing is done after 38, but in this case, as shown in FIG.
As shown in A, after the time t38, in the microcomputer 83, the command data DCMD for instructing the stop mode is repeatedly formed in a period of several minutes for each period TSTP. In this case, the period TSTP is equal to or longer than the period TS when the receiving circuit 45 performs the intermittent reception, for example, TSTP = TS (= 680 m
Second), and during this period TSTP, the command data DCMD instructing the stop mode is repeated.

Then, as described above (as shown in FIG. 12B), this data DCMD is output by the circuits 91 to 94.
Converted to FM signal SRC, player 1 for each period TSTP
Sent to.

Therefore, even if another player nearby uses the same player and receiver to bring his player 1 into the reproduction mode or the like, the period TSTP
Then, the reception circuit 45 receives the FM signal SRC of the command data DCMD instructing the stop mode, so that the player 1 enters the stop mode from the time of reception.

Since the receiver 6 is not used in this case, the cords of the headphones 7 of the receiver 6 are generally folded. Since the folded code acts as a transmitting antenna for the FM signal SRC, the FM signal SRC transmitted from the receiver 6 has a short reach, and thus may interfere with the players of other users. There is almost no sex.

Thus, also in this case, it is possible to avoid the trouble that the player 1 continues the repeat reproduction and the battery 4 becomes empty without knowing it.

Others In the above description, the present invention is applied to a headphone type stereo cassette player, but the present invention is also applied to a player using a CD, MD, DAT, DCC or the like as a recording medium. can do.

Similarly to the player 1, the receiver 6 also executes the intermittent reception, and when the reproduction key of the operation keys 33 of the player 1 is pressed, the receiver 6 is also in the reproduction mode by the transmission signals SL and SR from the player 1. Then, the audio signals L and R from the player 1 can be heard by the receiver 6. Furthermore, similar processing can be performed when switching from an operation mode other than the reproduction mode and the stop mode to another operation mode.

[0121]

According to the present invention, even if the player 1 is in the stop mode, the player 1 can be put into the reproduction mode by the remote controller from the receiver 6.

Further, when the player 1 and the receiver 6 are in the stop mode, each consumes a current, but the current consumption of the player 1 is about 1 mA on average, and the capacity of the battery 4 is 60%.
From the viewpoint of 0mAh, it can be sufficiently ignored. The current consumption of the receiver 6 is almost zero.

Therefore, when the player 1 is set to the reproduction mode, it is not necessary to operate the standby switch, and the stop mode can be changed to the reproduction mode by the same key operation as that of a normal non-wireless player.
Also, because it does not require the operation of the standby switch,
Problems such as running out of batteries due to forgetting to turn off the standby switch will not occur.

Furthermore, even if the same player and receiver are used nearby, the player 1 in the stop mode does not enter the reproduction mode or the like by operating the player and the receiver, and the battery 4 is wasted. Never.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of a signal system of a player according to the present invention.

FIG. 2 is a system diagram showing an example of a signal system of a receiver according to the present invention.

FIG. 3 is a connection diagram showing an example of a power supply system of the player according to the present invention.

FIG. 4 is a connection diagram showing an example of a power supply system of a receiver according to the present invention.

FIG. 5 is a waveform chart for explaining the operation of an example of the present invention.

FIG. 6 is a waveform diagram for explaining the operation of an example of the present invention.

FIG. 7 is a waveform diagram for explaining the operation of the example of the present invention.

FIG. 8 is a waveform chart for explaining the operation of an example of the present invention.

FIG. 9 is a waveform diagram for explaining the operation of an example of the present invention.

FIG. 10 is a system diagram showing another example of the signal system of the player according to the present invention.

FIG. 11 is a system diagram showing another example of the signal system of the receiver according to the present invention.

FIG. 12 is a waveform chart for explaining the operation of an example of the present invention.

FIG. 13 is a perspective view for explaining the present invention.

[Explanation of symbols]

 1 Headphone Type Stereo Cassette Player 4 Battery 6 Dedicated Receiver 7 Headphone 8 Battery 10 Playback Circuit 20 Transmission Circuit 31 Tape Running Mechanism 32 Microcomputer 42 Modulation Circuit 45 Reception Circuit 60 Reception Circuit 83 Microcomputer 84 LCD 85 Operation Key 94 Transmission Circuit DMD Mode data DCMD command data

Claims (5)

[Claims] 1. An audio device and a receiver thereof for transmitting an audio signal wirelessly, wherein the audio device includes a reproduction circuit for reproducing the audio signal, and a transmission circuit for transmitting the audio signal from the reproduction circuit. A receiver circuit for receiving a remote control signal from the receiver, and a control circuit for switching the operation mode of the audio device between at least a stop mode and a playback mode in accordance with the remote control signal received by the receiver circuit. The receiver includes a receiving circuit that receives the signal transmitted from the transmitting circuit, an acoustic unit that converts the audio signal from the receiving circuit into sound, and a remote control signal that remote-controls the audio device. A circuit and an operation key for a remote controller, When the receiver is in the stop mode, the transmitter circuit of the audio device is turned off, the receiver circuit performs intermittent reception of the remote control signal from the receiver, and When the power supply of the transmitter circuit and the receiver circuit is off, and the remote control signal instructing an operation mode other than the stop mode is transmitted from the receiver, the receiver circuit of the audio device is While receiving continuously, the audio device enters the operation mode according to the remote control signal, and when the operation mode is other than the stop mode, the remote control signal for instructing the stop mode is transmitted from the receiver. The audio device is in the stop mode and the receiving circuit of the audio device is Wirelessly audio equipment and the receiver is to perform a deletion specific receiver. 2. The wireless audio device and the receiver thereof according to claim 1, wherein the receiver has a display element, and when a remote control signal for instructing an operation mode is transmitted from the receiver to the audio device. , The audio device enters the instructed operation mode and transmits data indicating the operation mode to the receiver, and the receiver according to the operation mode data transmitted from the audio device, A wireless audio device and its receiver adapted to display the operation mode on the display element. 3. The wireless audio device and the receiver thereof according to claim 1, wherein the receiver is stopped when an operation key for instructing the stop of the receiver is pressed for a predetermined period. A wireless audio device and its receiver adapted to enter the mode. 4. The wireless audio device and the receiver thereof according to claim 1, claim 2 or claim 3, wherein when the audio device is in the stop mode,
A wireless audio device and a receiver thereof in which the receiving sensitivity of the receiving circuit is lowered. 5. The wireless audio device and the receiver thereof according to claim 1, 2, or 3, wherein the receiver sends the remote control signal for instructing the audio device to the stop mode. A wireless audio device and a receiver thereof, which are configured to repeatedly transmit a remote control signal instructing the stop mode after transmission, at a predetermined cycle.