JPS58120320A - Mode switching system - Google Patents

Abstract

PURPOSE:To facilitate the mode switching even in the darkness, by providing a vibration pickup device like a microphone, etc. to a device which requires the mode switching and then detecting the number of vibrations applied to the device to perform the mode switching. CONSTITUTION:A vibration pickup device PU1 like a microphone, etc. is provided to the set of a device like an audio tape recorder, etc. which requires the mode switching. When the set is knocked with a finger, etc., the PU1 detects the vibration due to the knocking. The detected signal is fed to a comparator 4 after amplification 2 and wave detection 3. The comparator 4 compares the detected signal with a certain level and delivers a square waveform to feed it to monostable multivibrators 6 and 6' via OR circuits 5 and 5' respectively. The vibrator 6 delivers a short pulse to a counter 7, and the counter 7 feeds signals to an FF8 from Q1-Q4 in response to the number of pulses. The vibrator 6' delivers a mask pulse (e) for about one second after the rise of the input signal to the FF8. The FF8 has an AND between the pulse (e) and the signal supplied from the counter 7 and delivers mode switching signals corresponding to the knocking frequencies.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mode switching system for devices such as audio tape recorders, tuners, VTRs, video discs, etc. that require mode switching.

Conventionally, as this type of device, there has been a mode selector, such as a keyboard type or push button type, in which the mode is switched by applying pressure with a finger. However, when actually switching modes, you must first visually check the selector and confirm its position before starting the mode switching operation.
It takes time to switch modes, which is inconvenient when urgent mode switching is required. Also, there is a risk of causing a malfunction due to haste. Furthermore, when operating these mode selectors in the dark, methods such as providing a lamp on the set or making the selector self-illuminated are well known.

However, when listening to music while sleeping in the dark, for example, it is necessary to get up every time the mode is to be switched, check the position of the mode selector as described above, and then start the switching operation.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and is to provide a vibration pickup device such as a microphone to a set of equipment such as an audio tape recorder that requires mode switching, and to provide a vibration pickup device such as a microphone to the set. The purpose of this invention is to provide a method that allows mode switching using vibrations applied by knocking or the like.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a time chart of signal waveforms at each point in FIG. In FIG. 1, reference numeral 1 denotes a vibration pickup device such as a microphone that picks up vibrations applied to the set and outputs a certain signal. An amplifier 3 amplifies the signal output from the 2-digit vibration pickup device 1, a detection circuit 3 detects the signal amplified by the amplifier 2, and a 4-digit detection circuit 3 compares the detected signal at a certain level and generates a square wave. This is a comparator circuit that obtains the following. 5.5' is OR gate, 6
．． 6' is a mono multivibrator. The mono multivibrator 6 outputs a signal with a narrow pulse width, and the mono multivibrator 6' outputs a mask pulse for about 1 second from the rise of the first signal. 7 is a decimal counter, which outputs Ql, Q2, Q according to the number of input signals.
Output S and Q4. 8 is a D-flip-flop that outputs the mask pulse output from the monomultipipe rake 6' and the output Q1.8 output from the φ run turf. Q2, QS-
AND Q4 and make the mode selection signal Qs -Q
l2* Q's * Output from Ql4, 9, 10.
Reference numerals 11 and 12 denote amplifiers that amplify the mode selection signals output from the output 'S*Q'2*QIs*QS of the D-flip-flop 8, respectively. First, a knock is applied to the set with a finger or the like, and a vibration pickup device 1 such as a microphone picks up the knock. Here, select the number of knocks as shown in the table below. Generally, the pickup waveform of the microphone of the ibis that knocked the set is output as shown in a of FIG. 2. This is further amplified and then converted to a certain level in a comparator circuit 4 to obtain a square wave as shown in C in FIG. Furthermore, this signal is O
After passing through the R gate 5, the counter 7 outputs the signal as a narrow width signal (waveform d in FIG. 2) so that all the signals enter the mask pulse in the mono multivibrator 6.
is input. The number of signals is counted in the counter 7, and the output Q1* of the counter 7 according to the number of signals is
Q2 *Qs and Q4 are output. In this case, when the number of signals is 1, the output is Ql, when the number of signals is 2, the output is Q2, when the number of signals is 3, the output is QS, and when the number of signals is 4, the output is Q4. These outputs Qs, Q2, Qs, Q
It is input to a 4-digit D-flip-flop 8. On the other hand, QR
The signal from the comparator circuit 4 is applied to the gate 5', and the mono multivibrator 6' outputs a mask pulse (waveform e in Fig. 2) lasting about 1 second from the rise of the first pulse of the signal. be done. This one second is determined by the time constant of C1@R1, and only the number of knocks during this one second is detected.

In the D-flip-flop 8, the outputs Qs, @b, Qs, Qa of the counter and the output of the mono-multivibrator 6' are ANDed, and a mode selection pulse is output from QSeQ'2-QlI-q-. Then, they are each amplified by amplifiers 9, 10, 11, and 12 to obtain final mode selection pulses A, B, C, and D.

For example, if the set knocks 4 times (knocks within a predetermined time, in this case within 1 second), the number of signals is 4 and the mode is REWIND. At this time, counter 7
Signals are sequentially outputted from the outputs Qs, Q2, and Qs-Q4, and these are connected to the D-flip-flop 8, and the output is taken out from the output q4 of the D-flip-flop 8. Here, the D-flip-flop 8 is clocked at the rising edge of the mask pulse output from the upper and front mono-multivibrator 6'.
Mode A shown in

Obtain B, C, and D outputs and switch modes using an electromagnetic plunger, etc.

In the above embodiment, when the number of modes is 4, VC is attached.

Although the explanation has been given above, it is possible to easily implement a larger number of modes. Further, this mode selection function t-ttr system control can be constructed at low cost by using a microcomputer or the like.

As mentioned above, the device VC that requires mode switching is equipped with a vibration pickup device 1 such as a microphone, and the mode is switched by detecting the number of vibrations applied to the device set. Therefore, since the entire set can function as a mode switch, it is possible to easily switch modes even in the dark, and emergency mode switching is also possible.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a time chart of signal waveforms at each point in FIG. 1... Vibration pickup device.

Claims (1)

[Claims] A mode switching method for equipment requiring mode switching, characterized in that the equipment is equipped with a vibration pickup device such as a microphone, and the mode is switched by detecting the number of vibrations applied to the equipment set.