JPS60136464A - Control system for pb signal erasure - Google Patents

Abstract

PURPOSE:To prevent storage contents from incorporating a rasping PB signal when reproduced by converting the PB signal into soundless data and storing only speech data in a storage device. CONSTITUTION:An input signal (a) is applied to a muting circuit 1 and a PB signal receiver 6. The PB signal receiver 6 detects the PB signal, and when its detection signal is outputted, the muting circuit 1 converts data inputted during the period of the detection signal into soundless data, which is transferred to a delay circuit 2. A muting circuit 3 converts the PB signal into soundless data because the PB signal in a period corresponding to the nonoperation time of the PB signal receiver 6 is left in the data delayed by the delay circuit 2. Therefore, only a speech signal wherein the PB signal is erased completely is stored in a storage circuit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides a PB system in which unnecessary PB double signals (push button signals) can be erased and only audio signals can be stored in an audio storage device in a store-and-forward system, etc. This relates to a signal erasure control method.

Prior Art and Problems In the store-and-forward system, an audio storage device (1) is provided, which stores audio signals in response to requests from subscribers, and reproduces and transmits the stored contents in response to requests from other subscribers. It is something that can be done. In such a storage device, in order to reduce the storage capacity, silent parts are compressed,
Furthermore, it has been adopted to reduce the amount of stored data by means of band compression means. Furthermore, with the development of switching networks, it has become possible to control various devices in the home from outside the home using a telephone or the like. Similarly, even during audio storage operation, the PB double signal can be used as a control signal to control temporary stop and the like. When accumulated together with such a PB double signal audio signal,
The reproduced sound becomes harsh, and furthermore, it acts as a reproduction PB double signal control signal, which may cause unexpected malfunctions.

OBJECTS OF THE INVENTION It is an object of the present invention to erase unnecessary PB times signals when storing audio signals so that only audio signals can be stored.

Structure of the Invention The present invention provides a PB signal receiver power (, PB signal detection (2), etc.
) A first silencing circuit that converts received accumulated data into silent data using a ratio signal, and a delay circuit that delays the output signal of the first silencing circuit by a time corresponding to the dead time of the PB signal receiver. and a second silencing circuit that converts the output signal of the delay circuit into silent data using the PB multiplied signal detection signal, and stores the output signal of the second silencing circuit in a storage device. , Examples will be described in detail below.

Embodiment of the invention FIG. 1 is a block diagram of main parts of an embodiment of the invention.
．． 3 is a first and second silence circuit, 2 is a delay circuit, 4 is an accumulation circuit, 5 is a timing control circuit, 6 is a PB signal receiver, and 7 is an accumulation control circuit. In systems where audio storage devices are connected via a digital highway,
The input signal a is, for example, 1 according to the companding law such as μmβaw.
This becomes 8-bit time loft digital data and is applied to the first silencing circuit 1 and the PB signal receiver 6.

(3) The PB signal receiver 6 detects the PB double signal and sends the detected signal to the first and second silencing circuits 1.2 and the storage/accumulation I11 control circuit 74' output nL and 9 reception signal LJ. : PB I8 is added to the storage control circuit 7 as a 2B code G. In this case, a dead time T (usually 20 to 40 m5) is provided to distinguish between the audio signal and the PB double signal. The detection signal S is outputted after a dead time T after the PB multiplied signal is input. Also, the detection signal S is continuously outputted for a short time after the PB multiplied signal disappears.

The timing control circuit 5 also generates a timing signal specifying a time slot and applies it to the first and second silencing circuits L3. Further, the delay circuit 5 has a delay time corresponding to the dead time T of the PB signal receiver 6.

When the PB signal receiver 6 detects the PB double signal and outputs the detection signal, the first silence circuit 1 converts the data input during the period of the detection signal into silent data. It is converted and transferred to the delay circuit 2. In the second silence circuit 3, the PB signal of the time corresponding to the dead time T of the PB signal receiver 6 remains in the data delayed by the delay circuit 2. Convert to double signal silence data. Therefore, the storage circuit 4 stores only the audio signal from which the PB multiplied signal has been completely erased.

Fig. 2 (al to (el is the signal a - e of each part in Fig. 1)
This is an example of a PB signal inserted between voice data, which is manually input, and when the human input signal a is expressed as an analog signal as shown in (al), the PB signal receiver 6 receives the P
Detect the B-fold signal, and after the dead time T, detect the detection signal (bl
The signal is outputted as shown in FIG. The first silencing circuit 1 identifies the PB double signal time slot based on the timing signal from the timing control circuit 5, converts it into PB double signal silent data based on the detection signal, and outputs the same. This output signal C is transmitted to the PB signal receiver 6 as shown in fcl.
The PB multiplied signal remains without being erased for a dead time T of .

(5) This output signal C is delayed by a time corresponding to the dead time T by the delay circuit 2, and the output signal d is as shown in (d). Therefore, since the detection signal from the remaining PB double signal PB signal receiver 6 is delayed by the time it exists, it is converted into the remaining PB double signal silent data in the second silence circuit 3. Therefore, the output signal e will be as shown in (81).In other words, the PB multiplied signal will be completely erased, and only the audio signal will be stored in the storage device 4. The PB code f from the receiver 6 is applied to the accumulation control circuit 7, and controls such as temporary stopping of the accumulation operation are performed.

In the storage bag W4, silent data is compressed, and sound data is compressed and stored using an arbitrary compression means. Also, the stored data is reproduced and sent out upon request, and the sending route is not shown.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention includes a first silencing circuit 1 that converts received and stored (6) product data into silent data using a PB multiplied signal detection signal f from a PB signal receiver 6; A delay circuit 2 delays the output signal C of the first silencer circuit 1 by a time corresponding to the dead time T of the PB signal receiver 6; It is equipped with a second silencing circuit 3 that converts into silent data by f, and stores the output signal e of this second silencing circuit 3 in a storage device 4, which converts it into PB double signal silent data. As a result, only the audio data is stored in the storage device 4, and when the stored contents are played back, there is no possibility that the unpleasant PB double signal will be included (and there is no risk of it acting as a control signal). Furthermore, since it becomes possible to perform silence compression, it can also contribute to increasing the compression rate of audio data.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main parts of an embodiment of the present invention, and FIG. 2 (a
l~(el is an explanatory diagram of operation. 1.3 is the first and second silencing circuit, 2 is a delay circuit, 4
5 is an accumulation circuit, 5 is a timing control circuit, (7) 6 is a PB signal receiver, and 7 is an accumulation control circuit. Patent applicant: Fujitsu Ltd. Representative Patent Attorney Shoji Aitani Representative Patent Attorney Hiroshi Watanabe - (8) ltj D (Jt)

Claims (1)

[Claims] A first silencing circuit converts received accumulated data into silent data using a PB double signal detection signal from a PB signal receiver, and an output signal of the first silencing circuit is converted into a dead time of the PB signal receiver. and a second silence circuit that converts the output signal of the delay circuit into silence data using the PB multiplied signal detection signal,
A PB signal erasure control method characterized in that an output signal of a silencing circuit is accumulated in a storage device.