KR0135228B1 - Voice signal processing circuit - Google Patents

Abstract

The present invention relates to a voice signal processing apparatus, and in the related art, circuits of a system are complicated by using separate parts for processing voice signals such as voice signal exchange, conference call, tone generation signal, etc. In order to improve the problem that the price rises as a result of the use, the receiving PCM multiplexing line connecting means, the control data storing means, the PCM data storing means, the transmitting PCM multiplexing connecting means, the voice signal processing means and the voice signal processing to control the overall operation thereof It is composed of control means such as PCM signal exchange function, volume control function, conference call function and tone generation function.

Description

Voice signal processing circuit

1 is a block diagram of a conventional voice signal processing circuit.

2 is a block diagram of a voice signal processing circuit according to the present invention;

3 is a detailed block diagram of voice signal processing means in FIG.

4, (a) is a multiplexed line clock waveform diagram, and (b) is a frame synchronization signal waveform diagram.

* Description of the symbols for the main parts of the drawings *

10: receiving PCM multiplexing line connecting means 11: receiving PCM multiplexing line

20: PCM data storage means 30: control data storage means

40: audio signal processing means 41: latch means

42, 43: first and second gain and tone storage means 44, 45: first and second decompending means

46: calculation means 47: companding means

50: transmission PCM multiplexing line connecting means 51: transmission PCM multiplexing line

60: sound signal processing control means

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a circuit for processing a voice signal to enable voice signal exchange, signal size control, conference call, etc. of a digital simple switching device. The present invention relates to a voice signal processing circuit for speeding up and integrating various functions.

The conventional voice signal processing circuit receives and stores PCM data from the receiving PCM multiplexed line 1a as shown in FIG. 1 and transmits the PCM data under the control of a central processing unit (CPU) (not shown). The PCM switching unit 1 outputs the PCM multiplexing line 1b, and the signals of the subscribers A and B are received from the transmitting PCM multiplexing line 1b, summed together, and the received PCM multiplexing line is controlled by the central processing unit. And a tone signal generating means 3 for transmitting quantized PCM tone data to a transmitting PCM multiplexing line during a subscriber timeslot for which tones are to be heard.

The conventional voice signal processing circuit configured as described above is divided into PCM exchanger 1, conference call unit 2 and tone signal generator 3 to process voice signal exchange, conference call and tone signal generation as voice signals. It is composed of different operation methods.

That is, the PCM exchanger 1 receives the PCM data from the receiving PCM multiplexed line 1a and stores the PCM data in an internal memory (not shown), and then stores the PCM stored in the memory after one frame (125 μsec) has elapsed. The data is retrieved and output to the transmitting PCM multiplexed line 1b at timeslot times controlled by the CPU.

The conference call is sent by the conference call unit 2 to subscriber C by combining the signals of subscriber A and subscriber B, and the signals of subscriber A and subscriber C are added to subscriber B, and the signals of subscriber B and subscriber C are added together to subscriber A. Is made by sending to.

That is, the conference call unit 2 first receives the signals of subscribers A and B from the transmitting PCM multiplexing line 1b, sums them, and then outputs the receiving PCM multiplexing line, and receives them from the PCM switching unit 1 and stores the memory. It is then stored at the sender and sent to the transmitting PCM multiplexed line during the time slot of the next frame subscriber C. The same operation is repeated for other subscribers.

The tone signal outputs the quantized PCM tone data to the transmitting PCM multiplexed line 1b by the control of the central processing unit in the tone signal generator 3 during the subscriber timeslot for which the tone is to be heard.

However, such a conventional technology uses a separate component for processing a voice signal such as a voice signal exchange, a conference call, and a tone generation signal, thereby increasing the price of the system because the circuit of the system is complicated and duplicate circuits are used for each component. There was a problem.

Accordingly, the present invention provides a voice signal processing circuit to reduce the time required for operation and to easily configure the system by integrally processing the voice exchange function, conference call function, tone generation function and volume control function of the digital key phone system. Is in.

Such means for achieving the object of the present invention comprises a receiving PCM multiplexing line connecting means for receiving data from the receiving PCM multiplexing line according to the receiving control signal, and PCM data obtained from the receiving PCM multiplexing line connecting means to control signals. PCM data storage means for storing for one frame time, control data storage means for receiving a user's command by the system control central processing unit and storing control data for PCM data processing, and control commands stored in the control data storage means. Transmission PCM multiplexing line connecting means for transmitting the PCM data output from the voice signal processing means by the voice signal processing signal for processing the PCM data output from the PCM data storing means, and the receiving PCM Multiplexed line connection means, said PCM data storage means, phase The control data storage means and the voice signal processing means for controlling the voice signal processing means, respectively, according to the control clock, the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a voice signal processing circuit for implementing the present invention. As shown therein, a receiving PCM multiplexing line connecting means 10 for receiving data from a receiving PCM multiplexing line 11 according to a receiving control signal is shown. PCM data storage means 20 for storing the PCM data obtained from the reception PCM multiplexed line connection means 10 for one frame time according to a control signal, and by a system control central processing unit (not shown). Control data storage means (30) for storing control data for PCM data processing in response to a command; and PCM data output from the PCM data storage means (20) in accordance with a control command stored in the control data storage means (30). And a transmitting PCM for transmitting the voice signal processing means 40 for processing and the PCM data output from the voice signal processing means 40 through the transmission PCM multiplexing line 51. The raw line connecting means 50, the receiving PCM multiplexed line connecting means 10, the PCM data storing means 20, the control data storing means 30, and the audio signal processing means 40 to a control clock. According to the voice signal processing control means 60, respectively.

Here, the voice signal processing means 40 temporarily pauses the data output from the receiving PCM multiplexed line connection means 10 and the control data storage means 30 in accordance with the control signal obtained from the voice signal processing control means 60. Latch means (41) for storing, first, second gain and tone storage means (42) (43) for storing PCM data of tone signals in accordance with the data obtained by the latch means (41), and the first, First and second decompiling means 44 and 45 for converting the output data (8 bits) of the second gain and tone storage means 42 and 43 into data of predetermined bits (13 bits), respectively. And calculation means 46 for summing up the respective output data from the first and second decompiling means 44 and 45, and output data of the calculation means 46 to the audio signal processing control means ( And transmits to the transmission PCM multiplexing line connecting means by compiling with a predetermined bit in accordance with the control signal from 60). Is of a comb pending (Companding) means (47).

The operation and effects of the present invention configured as described above will be described in detail with reference to FIGS. 2 to 4.

First, the reception multiplexing line is a receiving line having an information amount of 4M BPS, and serves to receive data at an appropriate time.

That is, data is received by 8 bits every 125 mu sec in the reception multiplexing line.

PCM data refers to data obtained by digitally converting an audio signal, and the means for storing the data is the PCM data storage means 20.

The control data refers to parameters for controlling the circuit of the present invention to operate, and they are written in an external CPU, and the control data storage means 30 refers to a memory for storing them.

The processing of the PCM DATA refers to digitally increasing the gain or adding two data, which is called the processing of the voice signal. The method of implementing the voice signal is a method using a DSP or a pre-calculated data value. Can be stored in a ROM and read.

According to the present invention, the circuit can be configured by changing the clock of the multiplexed line and the number of multiplexed lines according to the capacity of the system. The most important thing is the operation of the audio signal processing means 40 as shown in the operation timing diagram of FIG. It depends on time.

For example, if 4MHZ is used as the multiplexed line clock and 9 multiplexed lines are configured as 64 channels in one multiplexed line, the total switching capacity is 576 channels, and the operation time of the voice signal processing means 40 is 217nsec. (125μsec ÷ 64 ÷ 9 = 217nsec)

2 is a block diagram of a speech processing circuit according to the present invention. As shown in this figure, the receiving PCM multiplexing line connecting means 10 receives serial data from the receiving PCM multiplexing line 11 to make parallel data, and then Each time a control signal is received from the signal processing control means 60, it is stored in the PCM data storage means 20.

For example, 576 channel PCM data is received and stored for one frame (12 μsec) time, and the frame is continuously repeated.

The central processing unit (not shown in the drawing) receives the user's information and stores it in the control data storage means 30, and the audio signal processing means in accordance with the operation timing of the transmission PCM multiplexing line 51 in the voice signal processing control means 60. A control signal is generated to allow 40 to operate.

The voice signal processing means 40 has a voice signal exchange function, a tone generating function, a voice signal synthesizing function, and a volume control function, all of which are operated by the same operating principle.

The above-mentioned receiving PCM multiplexing line connection receives data from another place, and the transmitting PCM multiplexing line is a line for transmitting data to another place.

The use of a single line for multiple circuits (TDM) gives you the opportunity to use them at specific times.

That is, time is given to output 8-bit data once for 125 mu sec.

The transmission PCM multiplexing line connecting means 50 converts the parallel PCM data output from the audio signal processing means 40 into serial data and outputs the serial PCM to the transmitting PCM multiplexing line 51.

3 is a detailed block diagram of the audio signal processing means. As shown therein, data is read from the PCM data storage means 20 and latched in the first and third latch portions 41a and 41c to control data. As control data is read from the storage means 30 and latched to the second and fourth latch portions 41b and 41d, data of the first and second gain and tone storage means 42 and 43 are output. .

The output of the first gain and tone storage means 42 is converted into 13-bit data by the first decompilation means 44, and the output of the second gain and tone storage means 43 is the second decompiling means 45. Is converted into 13-bit data and added by the computing means 46 is converted into 8-bit PCM data according to A-LOW or μ-LOW by the compensating means 47.

In this way, the converted PCM data is transmitted to the subscriber via the transmission PCM multiplexed line connection means 50.

In the above operation, the exchange function, the tone generating function, the voice signal synthesizing function and the volume adjusting function are determined in accordance with the contents of the control data storage means 30.

The audio signal synthesis function and the volume control function are always performed in the above operation process, and there is a slight difference between the exchange function and the tone generation function.

That is, each half of the first and second gain tone storage means 42, 43 is an area for gain adjustment, and half is an area for tone generation.

First, referring to the signal exchange function, the gain parameter data of the source signal is stored in the second latch unit 41b, the PCM data of the source signal is stored in the first latch unit 41a, and the third latch unit 41c. And the silence signal data is stored in the fourth latch portion 41d.

The data selected by these addresses is delivered to the subscribers whose PCM values are output according to the above operation.

That is, if the source signal is subscriber A, and the subscriber receiving the signal is subscriber B, the PCM data of subscriber A is adjusted and delivered to subscriber B.

In the tone generation function, an address in which data of a specific tone is stored is designated in the second latch portion 41b, and an output of a counter is stored in the first latch portion 41a so that PCM tone data is stored in the first gain and tone storage means. Output from (42).

If silence is transmitted from the third latch portion 41d and the fourth latch portion 42d and another single frequency is selected as in the first gain and tone storage means 42, the output of the voice signal processing circuit is multi-frequency. Tone signal is generated.

As described above, the present invention integrates the exchange function, the tone generation function, the volume control function, and the conference call function, so that the time required for operation is only one frame time, and since the circuit is shared, the system can be improved. There is an effect that can simplify the configuration and reduce the cost.

Claims (5)

Receiving PCM multiplexing line connecting means for receiving data from the receiving PCM multiplexing line according to the receiving control signal, and PCM data obtained from the receiving PCM multiplexing line connecting means connected to an output terminal of the receiving PCM multiplexing line connecting means according to a control signal. PCM data storage means for storing the frame time, control data storage means for storing the control data for processing PCM data by receiving a user's command by the system control central processing unit (CPU) and outputting to the voice signal processing means; A voice signal processing means connected to process the PCM data output from the PCM data storage means according to a control command stored in the control data storage means and output to the transmission PCM multiplexed line connecting means, and a voice connected to an output terminal of the voice signal processing means Send PCM data output from the signal processing means A transmission PCM multiplexing line connecting means for transmitting through the main line 51 and the receiving PCM multiplexing line connecting means, a PCM data storing means, a control data storing means, and a voice signal processing means respectively connected to them to control according to a control clock. A voice signal processing circuit comprising a voice signal processing control means. 2. The apparatus of claim 1, wherein the voice signal processing means comprises: latch means for temporarily storing data output from the receiving PCM multiplexed line connection means and control data storage means in accordance with a control signal obtained from the voice signal processing control means; The first and second game and tone storage means for storing the PCM data of the tone signal and the gain adjustment value according to the data obtained by the means, and the output data of the first and second gain and tone storage means as predetermined bits of data. First and second decompilation means for converting, arithmetic means for summing output data from the first and second decompilation means, and output data of the arithmetic means from the audio signal processing control means. Companding means for compiling with a predetermined bit in accordance with a control signal to transmit to the transmission PCM multiplexing line connection means. The audio signal processing circuit. The voice signal processing circuit according to claim 1, wherein said voice signal processing means has voice signal exchange, tone generation, voice signal synthesis, and volume control functions. 3. The apparatus according to claim 2, wherein the latching means temporarily stores the output data from the receiving PCM multi-line connection means according to the control signal of the voice signal processing control means and transmits it to the first and second gain and tone storage means. A second latch unit for storing the control data temporarily from the control data storage means and transmitting the first and third latches to the first and second gain and tone storage means according to the control signal of the audio signal processing control means. And a fourth latch unit. 3. The audio signal processing circuit according to claim 2, wherein the first and second decompiling means change the 8-bit output data of the first, second gain and tone storage means into 13-bit data.