JPH0568140U - Transceiver with audio device - Google Patents

Abstract

(57) [Summary] [Objective] An audible problem is solved by an audio device when the transceiver is waiting and receiving, and a call non-response from the other party of the transceiver is prevented by the masking effect of the audio device. An electric field strength detector is provided at least in a transceiver receiving section, and an electronic switch having a plurality of contacts is provided between a receiving section detector output section of the transceiver and a low frequency amplifier for amplifying the detector output. A transceiver with an audio device, wherein when the output of the electric field intensity detector is below a predetermined electric field intensity, the output of the electric field intensity detector is used as a trigger to switch the electronic switch to the audio device output side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transceiver with an audio device.

[0002]

[Prior Art]

 In a conventional FM transceiver, a squelch circuit is used to cut off the jarring white noise peculiar to the FM when no radio wave is input. The squelch circuit was mainly composed of a field strength detector in the transceiver receiving section, a low frequency amplifier for amplifying the output of the reception detector, and a muting circuit for cutting the output of the low frequency amplifier.

In the operation, when the radio wave input to the receiver becomes lower than a predetermined level, the muting circuit is activated, and the annoying white noise peculiar to FM in the no radio wave input state is erased.

[0004]

[Problems to be solved by the device]

 In this way, the squelch circuit is indispensable for FM transceivers, and comfortable FM reception is now possible. However, even though the squelch circuit operates as described above, the following problems occur. For example, I was not worried during a call, but when the other party was waiting for a long time and was receiving, the sound was muted by the squelch circuit, which resulted in long silence, which made me bored.

In order to solve these problems, recently, in order to have a comfortable time at the time of waiting for a transceiver, the number of people who use radios and telephones together has been increasing. However, it was difficult for a large number of people to enjoy the sound from those devices through the speakers, and in general, they came to wear headphones. However, due to the fact that the earphones are blocked by the headphones and the masking effect of the audio device, the problem of not being aware of the call of the other party has arisen.

[0006]

[Means for Solving the Problems]

 In a transceiver integrally equipped with an acoustic device, an electric field strength detector is provided at least in the transceiver receiving section, and a plurality of contacts are provided between the receiving section detector output section of the transceiver and the low frequency amplifier for amplifying the detector output. An electronic switch having a switch is provided, and when the output of the electric field strength detector is below a predetermined electric field strength, the output of the electric field strength detector is used as a trigger to switch the electronic switch to the output side of the acoustic device. is there.

[0007]

[Action]

 With these configurations, the sound source of the low-frequency amplifier becomes the acoustic device when the transceiver receiver is in the non-input state, that is, in the standby reception.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIG. An audio device 10 is an FM radio in this embodiment. Reference numeral 20 denotes an antenna switch, which is switched according to transmission / reception of the transceiver. The antenna switch 20 is located on the upper side during reception and on the lower side during transmission.

Reference numeral 50 is a PLL synthesizer, which is a VCO 51 and a PLL 52, and is always controlled to a designated frequency in combination with the microcomputer 60. Reference numeral 30 denotes a transceiver receiver, and in this embodiment, a single superheterodyne system for converting the frequency once is described. The transceiver receiving section is composed of a bandpass filter 31, a high frequency amplifier 32, a frequency mixer 33, an intermediate frequency filter 34, an intermediate frequency amplifier 35, and a detector 36.

Next, the radio wave receiving operation will be described. In the radio wave input from the antenna, unnecessary radio wave components are removed by the band pass filter 31, and only a specific radio wave is high frequency amplified by the high frequency amplifier 32. In the mixer 33, the received frequency is mixed with the input frequency from the PLL synthesizer 50, and these are taken out by the intermediate frequency filter 34 as an intermediate frequency. After that, the intermediate frequency amplifier 35 amplifies the intermediate frequency, and the detector 36 further detects the frequency of the input radio wave.

The intermediate frequency amplifier 35 takes out a signal meter output current whose output current changes according to the input level of the received radio wave. The signal meter output current increases as the input radio wave becomes stronger, and the input radio wave becomes weaker. Will be less. The signal meter output current is converted to a voltage by IV conversion in the variable resistor 37. Then, the preset constant voltage source 38 and the IV-converted voltage are compared in the voltage comparator 39, and the constant voltage source 38 is used as a threshold to change the output of the voltage comparator. It serves as a control signal for the switch 61.

In this embodiment, when there is no input radio wave in the receiving section, the voltage comparator output becomes low level, the reciprocal contact electronic switch 61 is switched to the upper side, and the sound source becomes the acoustic device. Also, when there is a radio wave input, the output of the voltage comparator 39 becomes high level, the multi-contact electronic switch 61 becomes the lower side, and the sound source becomes the wave detector 36 of the transceiver receiver.

The volume of the sound source selected by the electronic switch is adjusted by the variable resistor 62, low-frequency amplified by the low-frequency amplifier 63, and then the headphone 64 is sounded. In the present embodiment, the FM radio is taken as an example of the audio device, but this is not particularly limited to the FM radio.

[0014]

[Effect of the device]

 By using the configuration of the present invention in this way, the sound source becomes a sound device when the transceiver is waiting and receiving, and the sound device is not only muted by the squelch while waiting and receiving the other party. You can enjoy the sound of, and the boredom and pain of the conventional transceiver when receiving and waiting are eliminated, and the firmness of the transceiver is eliminated and it becomes fun.

Further, since the earphones are blocked by the headphones and the masking effect of the audio device, there is no serious problem that the important call from the other party is not noticed. As described above, by using the present invention, comfort while using the transceiver is increased and smooth standby reception is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a wireless communication device with an audio device of the present invention.

[Explanation of symbols]

 10 Acoustic Device 20 Antenna Switch 30 Transceiver Receiver 31 Bandpass Filter 32 High Frequency Amplifier 33 Mixer 34 Intermediate Frequency Filter 35 Intermediate Frequency Amplifier 36 Detector 37 Variable Resistor 38 Constant Voltage Source 39 Voltage Comparator 40 High Frequency Amplifier 50 PLL Synthesizer 51 VCO 52 PLL 60 Microcomputer 61 Multiple contact electronic switch 62 Variable resistor 63 Low frequency amplifier 64 Headphone

Claims (1)

[Scope of utility model registration request] 1. In a transceiver integrally provided with an acoustic device, an electric field strength detector is provided at least in a transceiver receiving section, and between the receiving section detector output section of the transceiver and a low-frequency amplifier for amplifying the detector output. An electronic switch having a plurality of contacts is provided to switch the electronic switch to the output side of the audio device when the output of the electric field intensity detector is below a predetermined electric field intensity, using the output of the electric field intensity detector as a trigger. A transceiver with an audio device characterized in that